CN107883369A - Adapt to the boiler feedwater step heating system and adjusting method of the wide load denitration of unit - Google Patents
Adapt to the boiler feedwater step heating system and adjusting method of the wide load denitration of unit Download PDFInfo
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- CN107883369A CN107883369A CN201711241985.7A CN201711241985A CN107883369A CN 107883369 A CN107883369 A CN 107883369A CN 201711241985 A CN201711241985 A CN 201711241985A CN 107883369 A CN107883369 A CN 107883369A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 32
- 238000000605 extraction Methods 0.000 claims abstract description 40
- 238000003303 reheating Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 52
- 230000008569 process Effects 0.000 claims description 18
- 238000012546 transfer Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 239000003546 flue gas Substances 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a kind of boiler feedwater step heating system for adapting to the wide load denitration of unit,Including steam turbine high-pressure cylinder,Steam Turbine Through IP Admission,Reheater,Three-level high-pressure heater,Two level high-pressure heater,One-level high-pressure heater,First steam condenser,Second steam condenser,Industrial steam heat exchanger,3rd steam condenser,Reheated steam heat exchanger,Economizer,Denitrification apparatus,Steam turbine high-pressure cylinder,Reheater is sequentially connected with Steam Turbine Through IP Admission,Deaerated feedwater pipe is sequentially connected three-level high-pressure heater,Two level high-pressure heater,One-level high-pressure heater,First steam condenser,Second steam condenser,Industrial steam heat exchanger,3rd steam condenser,Reheated steam heat exchanger and economizer,Steam Turbine Through IP Admission adds extraction steam pipe with three-level height respectively,Extraction steam for factories pipe connects,Extraction steam for factories pipe is connected with industrial steam heat exchanger,The reheating extraction steam pipe venthole with reheater respectively,Reheated steam heat exchanger air intake connects.
Description
Technical field
The invention belongs to thermoelectricity flexibility technical field, and in particular to a kind of boiler feedwater for adapting to the wide load denitration of unit
Step heating system and adjusting method, the thermal power plant for the unit load peak regulation that is particularly suitable for use in.
Background technology
At present, China's policy gradually payes attention to the popularization of new energy, reduces the ratio of fired power generating unit.Ended for the end of the year 2012, I
The existing 44.8GW of state installed capacity of wind-driven power.But wind-powered electricity generation has very strong randomness, intermittence, uncontrollability and demodulates peak spy
Property, this carries out the difficulty of peak load regulation network with regard to gradually increasing fired power generating unit.In order to effectively dissolve new forms of energy resource, country by
The policy requirement of fired power generating unit peak regulation is gradually increased, if northeast Supervision Bureau of National Energy Board is on printing and distributing《Tohoku Electric Power peak regulation
Assisted hatching supervisory method (tentative)》And its supplementary provisions requirement will lift clean energy resource consumption space, define simultaneously
" staged " compensation mechanism.As can be seen here, national policy is just progressively increasing the compensation dynamics to fired power generating unit peak modulation capacity, for
Fired power generating unit, its peak regulation potentiality is given full play to, be beneficial to be lifted the adaptability in its market.But national environmental protection is to fired power generating unit
The limitation of discharged nitrous oxides is very strict, it is desirable to：The flue gas of power plant emission needs to realize discharged nitrous oxides under full load
It is below 100mg/Nm3.Existing SCR denitration device boiler load less than 50% or so and it is following when reaction efficiency it is serious under
Drop, it is impossible to meet the requirement of pollution discharging thing discharge standard, limit the performance of fired power generating unit peak modulation capacity.
At present, mainly solves the problem by transforming the technological means of economizer, such as patent 1：Economizer is segmented pot
The low NO of stove full loadXDevice and remodeling method (patent No. 201510701175.X), by the way that economizer is divided into high temperature section, medium temperature
Section, low-temperature zone, while denitrification apparatus reaction zone is arranged on the higher high temperature section and low-temperature zone of temperature, so as to solve the problem,
But the technology drawback is that the reconstruction scope is larger, and the original characteristics of compact layout of boiler tail, it is unsuitable for being transformed on a large scale, separately
Outside, when unit load is higher, flue-gas temperature is too high so that the flue-gas temperature of denitrification apparatus reaction zone drastically raises, so as to drop
The low reaction efficiency of denitration；Patent 2：The efficient SCR denitration structures and methods (patent No. that a kind of achievable full load puts into operation
201710168504.8) first layer, the second layer, third layer, are distinguished into by the reaction to denitrification apparatus, respectively in correspondence position
First order economizer, second level economizer are set, so as to solve the problem, but the maximum drawback of the technology is that transformation is complicated,
The reconstruction scope is big, and the boiler tail being not easy in characteristics of compact layout deploys to implement.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of boiler feedwater step heating for adapting to the wide load denitration of unit
System and adjusting method, have it is reasonable in design, transform simple, low-cost, dependable performance, adjust the advantages of simple.
In order to solve the above technical problems, the boiler feedwater step heating system of the adaptation wide load denitration of unit of the present invention,
The heating system includes steam turbine high-pressure cylinder, Steam Turbine Through IP Admission, reheater, three-level high-pressure heater, two level hyperbaric heating
Device, one-level high-pressure heater, the first steam condenser, the second steam condenser, industrial steam heat exchanger, the cooling of the 3rd steam
Device, reheated steam heat exchanger, economizer, denitrification apparatus, the steam drain of steam turbine high-pressure cylinder and the air intake of reheater connect, then
The venthole of hot device and the air intake of Steam Turbine Through IP Admission connect, and deaerated feedwater pipe is sequentially connected three-level high-pressure heater, two
Level high-pressure heater, one-level high-pressure heater, the first steam condenser, the second steam condenser, industrial steam heat exchanger, the 3rd
Steam condenser, reheated steam heat exchanger and economizer, are heated to deaerated feedwater, steam turbine high-pressure cylinder respectively with one-level height
Add extraction steam pipe, two level high plus extraction steam pipe connects, one-level is high plus extraction steam pipe is sequentially connected the second steam condenser, one-level high pressure adds
Hot device, two level is high plus extraction steam pipe is sequentially connected the first steam condenser, two level high-pressure heater, Steam Turbine Through IP Admission respectively with
Three-level is high plus extraction steam pipe, the connection of extraction steam for factories pipe, three-level height plus extraction steam pipe are sequentially connected the 3rd steam condenser, three-level high pressure
Heater, extraction steam for factories pipe are connected with industrial steam heat exchanger, reheating the extraction steam pipe venthole with reheater, reheated steam respectively
The air intake connection of heat exchanger, flue are sequentially connected economizer, denitrification apparatus.
Preferably, the deaerated feedwater pipe of first steam condenser is provided with the first feed water by-pass, and steamed first
The first valve, the second valve, the 3rd are respectively provided with the deaerated feedwater water inlet pipe of vapour cooler, outlet pipe and the first feed water by-pass
Valve.
Preferably, the deaerated feedwater pipe of second steam condenser is provided with the second feed water by-pass, and steamed second
The 4th valve, the 5th valve, the 6th are respectively provided with the deaerated feedwater water inlet pipe of vapour cooler, outlet pipe and the second feed water by-pass
Valve.
Preferably, the deaerated feedwater pipe of the industrial steam heat exchanger is provided with the 3rd feed water by-pass, and steamed in industry
The 7th valve, the 8th valve, the 9th are respectively provided with the deaerated feedwater water inlet pipe of vapour heat exchanger, outlet pipe and the 3rd feed water by-pass
Valve.
Preferably, the deaerated feedwater pipe of the 3rd steam condenser is provided with the 4th feed water by-pass, and steamed the 3rd
The tenth valve, the 11st valve, are respectively provided with the deaerated feedwater water inlet pipe of vapour cooler, outlet pipe and the 4th feed water by-pass
12 valves.
Preferably, the deaerated feedwater pipe of the reheated steam heat exchanger is provided with the 5th feed water by-pass, and steamed in reheating
Be respectively provided with the deaerated feedwater water inlet pipe of vapour heat exchanger, outlet pipe and the 5th feed water by-pass the 13rd valve, the 14th valve,
15th valve.
Preferably, being equipped with the 16th valve on the extraction steam for factories pipe, the 17th valve is housed on the reheating extraction steam pipe
Door.
Preferably, the three-level high-pressure heater, two level high-pressure heater, one-level high-pressure heater, industrial steam change
Hot device, reheated steam heat exchanger use wall-type heat exchange equipment or direct contact heat transfer equipment.
In order to solve the above technical problems, the boiler feedwater step heating system of the adaptation wide load denitration of unit of the present invention
Adjusting method, payload situation when whether the adjusting method participates in peak load regulation network and operation according to Steam Turbine, according to
Following steps are adjusted：
(1) when Steam Turbine is not involved in peak load regulation network and unit load is larger, the 16th valve (46), the 7th valve are closed
Door (37), the 8th valve (38), opening the 9th valve (39) makes deaerated feedwater be changed by the 3rd feed water by-pass (23), industrial steam
Hot device (9) is not put into operation, closes the 17th valve (47), the 13rd valve (43), the 14th valve (44), opens the 15th
Valve (45) makes deaerated feedwater not put into operation by the 5th feed water by-pass (25), reheated steam heat exchanger (11), passes through opening
And adjust the first valve (31), the second valve (32), the 3rd valve (33), the 4th valve (34), the 5th valve (35), the 6th valve
Door (36), the tenth valve (40), the 11st valve (41), the switch degree of the 12nd valve (42), make to change through economizer (12)
Exit gas temperature after heat reaches the process requirements of denitrification apparatus (13)；
(2) when Steam Turbine participate in peak load regulation network, unit load it is larger and through economizer (12) heat exchange after exiting flue gas
When temperature does not reach the process requirements of denitrification apparatus (13), on the basis of above-mentioned steps (1), the 16th valve (46) is opened,
Industrial steam heat exchanger (9) puts into operation, by opening and adjusting the 7th valve (37), the 8th valve (38), the 9th valve
(39) switch degree, the exit gas temperature after economizer (12) exchanges heat is made to reach the process requirements of denitrification apparatus (13)；
(3) when Steam Turbine participate in peak load regulation network, unit load it is smaller and through economizer (12) heat exchange after exiting flue gas
When temperature does not reach the process requirements of denitrification apparatus (13), on the basis of above-mentioned steps (2), the 17th valve (47) is opened,
Reheated steam heat exchanger (11) puts into operation, by opening and adjusting the 13rd valve (43), the 14th valve (44), the 15th
The switch degree of valve (45), the exit gas temperature after economizer (12) exchanges heat is reached the technique of denitrification apparatus (13) needs
Ask.
The present invention compared with prior art, has advantages below and effect：(1) fully recycle at different levels high plus draw gas
The degree of superheat, then draw gas acting capacity loss it is minimum in the case of, improve the temperature of boiler feedwater, improve the comprehensive of fired power generating unit
Close efficiency of energy utilization；(2) drawn gas using extraction steam for factories, reheating to heat deaerated feedwater, by increasing giving into economizer
Coolant-temperature gage improves the exit gas temperature of economizer, so as to improve the flue-gas temperature into denitrification apparatus, is giving full play to fire
While group of motors peak modulation capacity, the reaction efficiency of denitration has been effectively ensured；(3) in addition, using extraction steam for factories, reheating draw gas come
Deaerated feedwater is heated, reduces the acting steam flow of Steam Turbine flow passage component, so as to further improve the peak regulation of unit
Ability.
Brief description of the drawings
Fig. 1 is the boiler feedwater step heating system schematic diagram that the present invention adapts to the wide load denitration of unit.
Embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
As shown in figure 1, adapting to the boiler feedwater step heating system of the wide load denitration of unit, the heating system includes vapour
Turbine high pressure cylinder 1, Steam Turbine Through IP Admission 2, reheater 3, three-level high-pressure heater 4, two level high-pressure heater 5, one-level high pressure add
Hot device 6, the first steam condenser 7, the second steam condenser 8, industrial steam heat exchanger 9, the 3rd steam condenser 10, reheating are steamed
Vapour heat exchanger 11, economizer 12 and denitrification apparatus 13, the high steam from utility boiler enter steam turbine high-pressure cylinder 1,
The steam drain of steam turbine high-pressure cylinder 1 is connected with the air intake of reheater 3, the venthole of reheater 3 and entering for Steam Turbine Through IP Admission 2
Steam ports connects, and the steam discharge of Steam Turbine Through IP Admission 2 continues to do work into turbine low pressure cylinder, and deaerated feedwater pipe 19 is sequentially connected three
Level high-pressure heater 4, two level high-pressure heater 5, one-level high-pressure heater 6, the first steam condenser 7, the second steam condenser
8th, industrial steam heat exchanger 9, the 3rd steam condenser 10, reheated steam heat exchanger 11 and economizer 12, deaerated feedwater is carried out
Heating, steam turbine high-pressure cylinder 1 are connected with one-level height plus extraction steam pipe 14, two level height plus extraction steam pipe 15 respectively, and one-level is high to add extraction steam pipe
14 are sequentially connected the second steam condenser 8, one-level high-pressure heater 6, and one-level is high plus draws gas by the He of the second steam condenser 8
One-level high-pressure heater 6 heats to deaerated feedwater, two level is high plus extraction steam pipe 15 be sequentially connected the first steam condenser 7,
Two level high-pressure heater 5, two level is high plus draws gas to enter deaerated feedwater by the first steam condenser 7 and two level high-pressure heater 5
Row heating, Steam Turbine Through IP Admission 2 are connected with three-level height plus extraction steam pipe 16, extraction steam for factories pipe 17 respectively, three-level height plus extraction steam pipe 16
The 3rd steam condenser 10, three-level high-pressure heater 4 are sequentially connected, three-level is high plus draws gas by the He of the 3rd steam condenser 10
Three-level high-pressure heater 4 is heated to deaerated feedwater, and extraction steam for factories pipe 17 is connected with industrial steam heat exchanger 9, and deoxygenation is given
Water is heated, and the venthole with reheater 3, the air intake of reheated steam heat exchanger 11 are connected reheating extraction steam pipe 18 respectively, then
Heat is drawn gas to be heated by reheated steam heat exchanger 11 to deaerated feedwater, and flue 20 is sequentially connected economizer 12, taken off
Nitre device 13, deaerated feedwater and flue gas are exchanged heat in economizer 12, and deaerated feedwater temperature, which improves, enters utility boiler,
Flue-gas temperature, which reduces, reaches denitration temperature.
Preferably, the deaerated feedwater pipe 19 of first steam condenser 7 is provided with the first feed water by-pass 21, and
The first valve 31, second is respectively provided with the deaerated feedwater water inlet pipe of one steam condenser 7, outlet pipe and the first feed water by-pass 21
Valve 32, the 3rd valve 33.
Preferably, the deaerated feedwater pipe 19 of second steam condenser 8 is provided with the second feed water by-pass 22, and
The 4th valve the 34, the 5th is respectively provided with the deaerated feedwater water inlet pipes of two steam condensers 8, outlet pipe and the second feed water by-pass 22
Valve 35, the 6th valve 36.
Preferably, the deaerated feedwater pipe 19 of the industrial steam heat exchanger 9 is provided with the 3rd feed water by-pass 23, and in work
The 7th valve the 37, the 8th is respectively provided with the deaerated feedwater water inlet pipe of industry vapor heat exchanger 9, outlet pipe and the 3rd feed water by-pass 23
Valve 38, the 9th valve 39.
Preferably, the deaerated feedwater pipe 19 of the 3rd steam condenser 10 is provided with the 4th feed water by-pass 24, and
Be respectively provided with the deaerated feedwater water inlet pipe of 3rd steam condenser 10, outlet pipe and the 4th feed water by-pass 24 the tenth valve 40,
11st valve 41, the 12nd valve 42.
Preferably, the deaerated feedwater pipe 19 of the reheated steam heat exchanger 11 is provided with the 5th feed water by-pass 25, and
The 13rd valve is respectively provided with the deaerated feedwater water inlet pipe of reheated steam heat exchanger 11, outlet pipe and the 5th feed water by-pass 25
43rd, the 14th valve 44, the 15th valve 45.
Preferably, be equipped with the 16th valve 46 on the extraction steam for factories pipe 17, equipped with the on the reheating extraction steam pipe 18
17 valves 47.
Preferably, the three-level high-pressure heater 4, two level high-pressure heater 5, one-level high-pressure heater 6, industrial steam
Heat exchanger 9, the heat exchanger types of reheated steam heat exchanger 11 determine according to the heat regenerative system of specific steam power plant, can be partitions
Formula heat transmission equipment or direct contact heat transfer equipment.
A kind of adjusting method of boiler feedwater step heating system according to the wide load denitration of above-mentioned adaptation unit, the tune
Payload situation when whether section method participates in peak load regulation network and operation according to Steam Turbine, is adjusted in accordance with the following steps
Section：
(1) when Steam Turbine is not involved in peak load regulation network and unit load is larger, the 16th valve 46, the 7th valve are closed
37th, the 8th valve 38, opening the 9th valve 39 makes deaerated feedwater not thrown by the 3rd feed water by-pass 23, industrial steam heat exchanger 9
Enter operation, close the 17th valve 47, the 13rd valve 43, the 14th valve 44, opening the 15th valve 45 makes deaerated feedwater
By the 5th feed water by-pass 25, reheated steam heat exchanger 11 does not put into operation, by opening and adjusting the first valve 31, the second valve
The 32, the 3rd valve 33 of door, the 4th valve 34, the 5th valve 35, the 6th valve 36, the tenth valve 40, the 11st valve the 41, the tenth
The switch degree of two valves 42, the exit gas temperature after economizer 12 exchanges heat is set to reach the process requirements of denitrification apparatus 13；
Using at different levels high plus draw gas deaerated feedwater is preheated, the degree of superheat that is at different levels high plus drawing gas fully is reclaimed, it is high to reduce three-level
The heat transfer temperature difference in heater 4, two level high-pressure heater 5, one-level high-pressure heater 6 is pressed, reduces irreversible loss；
(2) when Steam Turbine participate in peak load regulation network, unit load it is larger and through economizer 12 heat exchange after exiting flue gas temperature
When degree does not reach the process requirements of denitrification apparatus 13, on the basis of above-mentioned steps (1), the 16th valve 46 is opened, industry is steamed
Vapour heat exchanger 9 puts into operation, by opening and adjusting the switch degree of the 7th valve 37, the 8th valve 38, the 9th valve 39, makes
Exit gas temperature after the heat exchange of economizer 12 reaches the process requirements of denitrification apparatus 13；
When Steam Turbine participates in peak load regulation network, unit load gradually reduces, and amount of flue gas emission gradually reduces with initial temperature,
Exit gas temperature after the heat exchange of economizer 12 is gradually lowered, the process requirements until being unable to reach denitrification apparatus 13,
On the basis of aforesaid operations step (1), the 16th valve 46 is opened, industrial steam heat exchanger 9 puts into operation, now, opens simultaneously
The 7th valve 37, the 8th valve 38, the 9th valve 39 are adjusted, deaerated feedwater is heated using extraction steam for factories, to improve into province's coal
The deaerated feedwater temperature of device 12, so as to improve the exit gas temperature of economizer 12, make the outlet cigarette after economizer 12 exchanges heat
Temperature degree reaches the process requirements of denitrification apparatus 13；
(3) when Steam Turbine participate in peak load regulation network, unit load it is smaller and through economizer 12 heat exchange after exiting flue gas temperature
When degree does not reach the process requirements of denitrification apparatus 13, on the basis of above-mentioned steps (2), the 17th valve 47 is opened, reheating is steamed
Vapour heat exchanger 11 puts into operation, by the switch for opening and adjusting the 13rd valve 43, the 14th valve 44, the 15th valve 45
Degree, the exit gas temperature after economizer 12 exchanges heat is set to reach the process requirements of denitrification apparatus 13.
When Steam Turbine participates in peak load regulation network, unit load is more reduced, and amount of flue gas emission is more reduced with initial temperature,
(exit gas temperature i.e. after the heat exchange of economizer 12 does not reach de- when being still unable to meet demand using industrial steam heat exchanger 9
The process requirements of nitre device 13), now, the 17th valve 47 is opened, reheated steam heat exchanger 11 puts into operation, now, opens
And the 13rd valve 43, the 14th valve 44, the 15th valve 45 are adjusted, deaerated feedwater is heated using reheated steam, to enter one
Step improves the deaerated feedwater temperature into economizer 12, so as to further improve the exit gas temperature of economizer 12, makes through saving
Exit gas temperature after the heat exchange of coal device 12 reaches the process requirements of denitrification apparatus 13.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims
Scope defined in book, protection scope of the present invention all should be belonged to.
Claims (9)
- A kind of 1. boiler feedwater step heating system for adapting to the wide load denitration of unit, it is characterised in that the heating system bag Include steam turbine high-pressure cylinder (1), Steam Turbine Through IP Admission (2), reheater (3), three-level high-pressure heater (4), two level high-pressure heater (5), one-level high-pressure heater (6), the first steam condenser (7), the second steam condenser (8), industrial steam heat exchanger (9), 3rd steam condenser (10), reheated steam heat exchanger (11), economizer (12), denitrification apparatus (13), steam turbine high-pressure cylinder (1) Steam drain be connected with the air intake of reheater (3), the venthole of reheater (3) and the air intake of Steam Turbine Through IP Admission (2) connect Connect, deaerated feedwater pipe (19) is sequentially connected three-level high-pressure heater (4), two level high-pressure heater (5), one-level high-pressure heater (6), the first steam condenser (7), the second steam condenser (8), industrial steam heat exchanger (9), the 3rd steam condenser (10), Reheated steam heat exchanger (11) and economizer (12), are heated to deaerated feedwater, steam turbine high-pressure cylinder (1) respectively with one-level height Add extraction steam pipe (14), two level high plus extraction steam pipe (15) connection, one-level height plus extraction steam pipe (14) are sequentially connected the cooling of the second steam Device (8), one-level high-pressure heater (6), two level is high plus extraction steam pipe (15) is sequentially connected the first steam condenser (7), two level height Heater (5) is pressed, Steam Turbine Through IP Admission (2) is connected with three-level height plus extraction steam pipe (16), extraction steam for factories pipe (17) respectively, and three-level is high Extraction steam pipe (16) is added to be sequentially connected the 3rd steam condenser (10), three-level high-pressure heater (4), extraction steam for factories pipe (17) and work Industry vapor heat exchanger (9) connects, reheating extraction steam pipe (18) venthole with reheater (3), reheated steam heat exchanger (11) respectively Air intake connection, flue (20) is sequentially connected economizer (12), denitrification apparatus (13).
- 2. the boiler feedwater step heating system according to claim 1 for adapting to the wide load denitration of unit, it is characterised in that The deaerated feedwater pipe (19) of first steam condenser (7) is provided with the first feed water by-pass (21), and is cooled down in the first steam The first valve (31), the second valve are respectively provided with the deaerated feedwater water inlet pipe of device (7), outlet pipe and the first feed water by-pass (21) (32), the 3rd valve (33).
- 3. the boiler feedwater step heating system according to claim 2 for adapting to the wide load denitration of unit, it is characterised in that The deaerated feedwater pipe (19) of second steam condenser (8) is provided with the second feed water by-pass (22), and is cooled down in the second steam The 4th valve (34), the 5th valve are respectively provided with the deaerated feedwater water inlet pipe of device (8), outlet pipe and the second feed water by-pass (22) (35), the 6th valve (36).
- 4. the boiler feedwater step heating system according to claim 3 for adapting to the wide load denitration of unit, it is characterised in that The deaerated feedwater pipe (19) of the industrial steam heat exchanger (9) is provided with the 3rd feed water by-pass (23), and is exchanged heat in industrial steam The 7th valve (37), the 8th valve are respectively provided with the deaerated feedwater water inlet pipe of device (9), outlet pipe and the 3rd feed water by-pass (23) (38), the 9th valve (39).
- 5. the boiler feedwater step heating system according to claim 4 for adapting to the wide load denitration of unit, it is characterised in that The deaerated feedwater pipe (19) of 3rd steam condenser (10) is provided with the 4th feed water by-pass (24), and is cooled down in the 3rd steam The tenth valve (40), the 11st are respectively provided with the deaerated feedwater water inlet pipe of device (10), outlet pipe and the 4th feed water by-pass (24) Valve (41), the 12nd valve (42).
- 6. the boiler feedwater step heating system according to claim 5 for adapting to the wide load denitration of unit, it is characterised in that The deaerated feedwater pipe (19) of the reheated steam heat exchanger (11) is provided with the 5th feed water by-pass (25), and is exchanged heat in reheated steam The 13rd valve (43), the tenth are respectively provided with the deaerated feedwater water inlet pipe of device (11), outlet pipe and the 5th feed water by-pass (25) Four valves (44), the 15th valve (45).
- 7. the boiler feedwater step heating system according to claim 6 for adapting to the wide load denitration of unit, it is characterised in that 16th valve (46) is housed on the extraction steam for factories pipe (17), the 17th valve is housed on the reheating extraction steam pipe (18) (47)。
- 8. the boiler feedwater step heating system according to claim 7 for adapting to the wide load denitration of unit, it is characterised in that The three-level high-pressure heater (4), two level high-pressure heater (5), one-level high-pressure heater (6), industrial steam heat exchanger (9), Reheated steam heat exchanger (11) uses wall-type heat exchange equipment or direct contact heat transfer equipment.
- A kind of 9. regulation side of the boiler feedwater step heating system according to claim 8 for adapting to the wide load denitration of unit Method, it is characterised in that payload situation when whether the adjusting method participates in peak load regulation network and operation according to Steam Turbine, It is adjusted in accordance with the following steps：(1) when Steam Turbine is not involved in peak load regulation network and unit load is larger, the 16th valve (46), the 7th valve are closed (37), the 8th valve (38), opening the 9th valve (39) makes deaerated feedwater pass through the 3rd feed water by-pass (23), industrial steam heat exchange Device (9) does not put into operation, closes the 17th valve (47), the 13rd valve (43), the 14th valve (44), opens the 15th valve Door (45) makes deaerated feedwater not put into operation by the 5th feed water by-pass (25), reheated steam heat exchanger (11), by opening simultaneously Adjust the first valve (31), the second valve (32), the 3rd valve (33), the 4th valve (34), the 5th valve (35), the 6th valve (36), the tenth valve (40), the 11st valve (41), the switch degree of the 12nd valve (42), make to exchange heat through economizer (12) Exit gas temperature afterwards reaches the process requirements of denitrification apparatus (13)；(2) when Steam Turbine participate in peak load regulation network, unit load it is larger and through economizer (12) heat exchange after exit gas temperature When not reaching the process requirements of denitrification apparatus (13), on the basis of above-mentioned steps (1), the 16th valve (46), industry are opened Vapor heat exchanger (9) puts into operation, by opening and adjusting the 7th valve (37), the 8th valve (38), the 9th valve (39) Switch degree, the exit gas temperature after economizer (12) exchanges heat is set to reach the process requirements of denitrification apparatus (13)；(3) when Steam Turbine participate in peak load regulation network, unit load it is smaller and through economizer (12) heat exchange after exit gas temperature When not reaching the process requirements of denitrification apparatus (13), on the basis of above-mentioned steps (2), the 17th valve (47), reheating are opened Vapor heat exchanger (11) puts into operation, by opening and adjusting the 13rd valve (43), the 14th valve (44), the 15th valve (45) switch degree, the exit gas temperature after economizer (12) exchanges heat is made to reach the process requirements of denitrification apparatus (13).
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| CN107883369B (en) | 2024-01-09 |
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