CN106224935A - Improve the devices and methods therefor of boiler feed temperature - Google Patents
Improve the devices and methods therefor of boiler feed temperature Download PDFInfo
- Publication number
- CN106224935A CN106224935A CN201610806252.2A CN201610806252A CN106224935A CN 106224935 A CN106224935 A CN 106224935A CN 201610806252 A CN201610806252 A CN 201610806252A CN 106224935 A CN106224935 A CN 106224935A
- Authority
- CN
- China
- Prior art keywords
- pressure
- steam
- heater
- final stage
- extraction
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 27
- 238000000605 extraction Methods 0.000 claims abstract description 106
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 7
- 239000002510 pyrogen Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 description 36
- 238000010438 heat treatment Methods 0.000 description 12
- 230000007423 decrease Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 230000001172 regenerating effect Effects 0.000 description 7
- 230000033228 biological regulation Effects 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000010025 steaming Methods 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010977 unit operation Methods 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
- F22D1/325—Schematic arrangements or control devices therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a kind of device improving boiler feed temperature, this device includes jet chimney, newly-increased final stage high-pressure heater, back pressure type steam turbine electromotor and back pressure turbine extraction control valve, the steam of described jet chimney is from boiler, described steam flows through the high pressure cylinder of back pressure type steam turbine electromotor, back pressure turbine extraction control valve and newly-increased final stage high-pressure heater successively, enter the steam of newly-increased final stage high-pressure heater be cooled to hydrophobic after, flow automatically step by step through the high-pressure heater of former water supply system, eventually enter into oxygen-eliminating device；Another part steam continues what work done rear at back pressure type steam turbine electromotor, and wherein some vapor can also be extracted out at several inter-stages subsequently, it is provided that using to other users, final steam discharge also is used as other purposes.
Description
Technical field
The invention belongs to field, power plant, be specifically related to a kind of devices and methods therefor improving boiler feed temperature.
Background technology
Under various load conditions, Turbo-generator Set boiler feed temperature changes along with unit load fluctuation,
Substantially when unit load fluctuates, the parameter of drawing gas of final stage high-pressure heater changes, and causes final feed temperature to become
Change.Extracted steam from turbine typically uses non-adjustment type to draw gas, and its final stage parameter depends on the physical location of unit load and extraction opening,
And the physical location of extraction opening is once just be subjected to displacement after unit puts into operation, therefore, when unit load declines, former final stage
Extraction pressure will decline, and feed temperature declines therewith.The final stage of steam turbine is drawn gas on the high pressure cylinder being generally disposed at steam turbine,
After steam turbine high-pressure cylinder has manufactured and designed, cannot on original cylinder again perforate extraction opening is set, on the one hand, draw gas
Mouthful arrange and need to reserve through-flow, the most original rotor between adjacent two grade blades on rotor and cannot use, on the other hand,
Being both needed to perforate on inside and outside cylinder, high voltage component perforate needs reinforcement, and current technology does not has suitable work on the high parameter cylinder built up
Skill guarantees concept feasible.Therefore, as carried out technological transformation on original steam turbine, it is achieved the raising of feed temperature, unique way is just
Being to redesign to manufacture a high pressure cylinder original high pressure cylinder of replacement, the method combines Tong Liao area on the old unit putting into operation for a long time
Also it is feasible act.But the downtime needed for there is technological transformation is long, high in cost of production unfavorable factor.
At present, in short supply due to resources such as coals, people are intended to the 15th day of a lunar month for the pursuit of the improved efficiency of thermal power generation unit
Benefit is strong.Selecting because of by exhaust gas temperature, heated surface at the end of boiler, the evaporation capacity of boiler and turbine high-pressure of optimum feed temperature
The impact of the through-current capacity of end, affects boiler, steam turbine and the investment of each associated auxiliary systems, depreciation cost and factory to some extent
Electricity consumption, also by the influence of fluctuations of coal price.Along with the progress of science and technology, above-mentioned balance needs to study further, develop.
People improve constantly for the environmental requirement depended on for existence, and the construction of fired power generating unit largely receives limit
System.This development with China's economic and electric power resource demand is also existed the biggest contradiction.In China, handle existing fire well
The energy-conserving and environment-protective matters of group of motors, to national, the most great to the meaning of the mankind.
At present, in order to control the discharge of NOx, fired power generating unit mostly uses SCR technology (SCR) by boiler
The NOx that burning produces reduces, further to reach the requirement of discharge standard.But the properly functioning needs of denitrating catalyst are certain
Condition, one of them is exactly that flue-gas temperature can not the lowest (being typically not less than 320 DEG C).
Another present situation that fired power generating unit faces just is by degree of depth peak regulation, i.e. unit load to be needed constantly to adjust according to electrical network
Whole, the minimum operating load of stablizing of current fired power generating unit is 40%.Unit is when underload, and the exhaust gas temperature of boiler export declines.One
As, at 50 ~ 60% loads, boiler export exhaust gas temperature is lower than 320 DEG C, and now Normal practice is exactly that SCR is out of service, machine
Group NOx emission will exceed standard far away.
During due to unit design, the material such as boiler water wall is all it has been determined that improve feed temperature by technological transformation and need to consider respectively
Plant the material License Value under load condition and the safety problem etc. of boiler hydrodynamics.
Summary of the invention
For problems of the prior art, the present invention provides a kind of device improving boiler feed temperature and side thereof
Method, by the method rationally improving final stage feed temperature, is possible not only to improve the economy of unit, it is also possible to expand unit denitration
Range of operation.
For achieving the above object, the present invention is by the following technical solutions:
A kind of device improving boiler feed temperature, this device includes jet chimney, newly-increased final stage high-pressure heater, back pressure type vapour
Turbine generator and back pressure turbine extraction control valve, the steam output end mouth of described jet chimney and back pressure type steam turbine electromotor
High pressure cylinder entrance be connected, utilize drawing gas or steam discharge of back pressure type steam turbine electromotor, by newly-increased final stage high-pressure heater, heating
The feedwater of the high-pressure heater of former water supply system, described in be used the pressure in vapour source higher than in the high-pressure heater of former water supply system
The extraction pressure of former final stage high-pressure heater, described back pressure turbine extraction control valve is arranged on newly-increased final stage high-pressure heater
And on the pipeline between high pressure cylinder.
Described high pressure cylinder is provided with high pressure extraction mouth and steam drain, and the vapour source of described high pressure extraction mouth, by newly-increased final stage
High-pressure heater, continues to add the feedwater of the high-pressure heater of pyrogen water supply system, described in be used the pressure in vapour source higher than former to
The extraction pressure of the high-pressure heater Central Plains final stage high-pressure heater of water system, by back pressure turbine extraction control valve by it
Adjusting to desirable pressure, the steam discharge of described steam drain is used for other users.
Described high pressure cylinder is provided with high pressure steam drain and extraction opening, and the vapour source of described high pressure steam drain, by newly-increased final stage
High-pressure heater, continues to add the feedwater of the high-pressure heater of pyrogen water supply system, described in be used the pressure in vapour source higher than former to
The extraction pressure of the high-pressure heater Central Plains final stage high-pressure heater of water system, by back pressure turbine extraction control valve by it
Adjusting to desirable pressure, the unnecessary steam of described high pressure cylinder steam drain is for other users, drawing gas for it of described extraction opening
He is user.
Being additionally provided with the sub-high pressure extraction opening that several pressure taper off on described high pressure cylinder, this draws gas for other purposes.
Being additionally provided with several higher pressure extraction openings on described high pressure cylinder, this draws gas for other purposes.
A kind of method improving boiler feed temperature, it is characterised in that comprise the following steps:
Step 1, the steam of described jet chimney flow through the high pressure of back pressure type steam turbine electromotor successively from boiler, described steam
Cylinder, back pressure turbine extraction control valve and newly-increased final stage high-pressure heater, the steam entering newly-increased final stage high-pressure heater is cold
But become hydrophobic after, flow automatically step by step through the high-pressure heater of former water supply system, eventually enter into oxygen-eliminating device；Another part steam continues
What work done rear of back pressure type steam turbine electromotor, wherein some vapor can also be extracted out at several inter-stages subsequently, it is provided that gives
Other users use, and final steam discharge is used as other purposes；
Step 2, when use high pressure extraction mouth vapour source, by newly-increased final stage high-pressure heater, continue to add pyrogen water supply system
The feedwater of high-pressure heater, described in be used the pressure in vapour source and add higher than the high-pressure heater Central Plains final stage high pressure of former water supply system
The extraction pressure of hot device, is adjusted to desirable pressure, the steam discharge of described steam drain by back pressure turbine extraction control valve
For other users；
Step 3, when use high pressure steam drain vapour source, by newly-increased final stage high-pressure heater, continue to add pyrogen water supply system
The feedwater of high-pressure heater, described in be used the pressure in vapour source and add higher than the high-pressure heater Central Plains final stage high pressure of former water supply system
The extraction pressure of hot device, is adjusted to desirable pressure by back pressure turbine extraction control valve, described high pressure cylinder steam drain
Unnecessary steam is used for other users, drawing gas for other users of described extraction opening；
Step 4, when being additionally provided with the sub-high pressure extraction opening that several pressure taper off on high pressure cylinder, this draws gas for other purposes.
Step 5, when being additionally provided with several higher pressure extraction openings on high pressure cylinder, this draws gas and may be used for other purposes.
In steam thermodynamic cycle, from some intergrades of steam turbine, extract a part of steam out under normal circumstances, deliver to
For the heating of boiler feedwater in each bleeder heater, thus improve thermal economy for power plant.Feedwater extraction cycle is to utilize
In steam turbine, make the some vapor of merit, by regenerative water heaters heating feedwater, decrease cold source energy, a certain amount of
Steam is no longer delivered to after having made part merit in condenser to cooling medium heat release, which obviates the heat of steam and is cooled medium belt
Walk, make steam heat be fully used, reduce its heat consumption rate, simultaneously because make use of the steam making part merit steam turbine
Heating feedwater, improves feed temperature, decreases the heat transfer temperature difference of boiler heating surface, thus decreases in feedwater heating process
Irreversible loss, caloric receptivity the most in the boiler reduces the most accordingly.But employing backheat, regenerative water heaters have the temperature difference
Irreversible heat transfer process perseverance has loss of the work ability, and along with the increase of backheat progression, this loss of the work ability is gradually reduced.Work as level
When number trends towards infinite, this loss of the work ability i.e. trends towards zero.
As a example by single-stage draws gas backheat, along with moving after exhaust point, the feed temperature saturated temperature from steam turbine exhaust pressure
Degree starts to be incrementally increased, and the thermal efficiency is also gradually increased, and the feed temperature when thermal efficiency reaches maximum is referred to as optimal to water temperature
Degree, then when improving feedwater heating-up temperature, the thermal efficiency instead can reduce, and heat-economy can reduce accordingly simultaneously.This is because feedwater
After temperature improves, its extraction pressure also can be correspondingly improved, for this part is drawn gas, and drawing gas steam turbine of unit mass
Done in the amount of merit decrease, if stationary power generation amount is constant, then to increase the initial steam amount entering steam turbine, in order to make up because taking out
Vapour and the generated energy that reduces, extraction pressure is the highest, and the most the more, thus specific steam consumption is the biggest, arranges accordingly for the initial steam amount of increase
The biggest to the heat of low-temperature heat source, the numerical value of boiler heating constantly reduces, and specific steam consumption increases very fast, to cause heat consumption simultaneously
Rate increases accordingly, so that thermal efficiency of cycle reduces.In theory, the more, optimum feed temperature is the highest for backheat progression.
But, in actual applications, feed temperature is not to be heated to optimum feed temperature, it is necessary to consider backheat
Technical Economy, on the one hand, the raising of feed temperature, makes exhaust gas temperature raise, and boiler efficiency reduces, or need to increase boiler tail
Portion's heating surface, makes boiler investment increase；On the other hand, the evaporation capacity of boiler and the through-flow of turbine high-pressure end are made due to backheat
Amount will increase, and the through-current capacity of the low-pressure end of steam turbine and steam flow reduce accordingly, thus affect to some extent boiler,
Steam turbine and the investment of each associated auxiliary systems, depreciation cost and station service.Therefore, determined by technology and economy comparison optimal
Feed temperature.
In theory, the progression of feedwater backheat is the most, and its loss of the work ability is the least, and the efficiency of cycle is the highest, but with
The increase of heating progression, the growth of the thermal efficiency slows down gradually, and relatively benefiting is gradually reduced, and runs and also becomes more complicated, with
This simultaneously, the progression of regenerative steam is restricted by investment and place, and therefore can not arrange is too much, China's fired power generating unit reality
Backheat progression is as shown in table 1.
The main unit parameter of table 1 China
| Main vapour pressure (MPa) | Main vapour/reheat steam temperature (DEG C) | The power of the assembling unit (MW) | Feed temperature (DEG C) | Backheat progression (level) |
| 8.83 | 535/535 | 50、100 | 210~230 | 6~7 |
| 12.75~13.24 | 535/535；550/550 | 200 | 230~250 | 7~8 |
| 16.18 | 537~565/537~565 | 300、600 | 250~270 | 8~9 |
| 23.6 | 537~565/537~565 | 600、1000 | 270~280 | 8~9 |
In Steam Turbine Regenerative System, heat regenerative system performance driving economy is had a very big impact by the feedwater parameter of each heater.
Therefore, in thermodynamic system of steam tur design process, the selection of heater backheat distribution always design and the department of operation are universal
The problem paid attention to.
Chinese scholars has different research methoies to backheat heating distribution, and its assumed condition is slightly different, therefore has
Different backheat distribution methods, currently mainly have assigning enthalpy drop method, etc. assigning enthalpy drop method, constant enthalpy rise distribution method, etc. temperature rise distribution
Several typical heater backheat distribution method of method.These methods are different due to respective supposition condition, and obtained result is also
The most identical, general in the case of, when Steam Turbine Regenerative System design, the distribution method that backheat heats generally uses
Enthalpy rise distribution method or etc. temperature rise method.
Final stage high-pressure heater newly-increased in the present invention uses the vapour source higher than former final stage high-pressure heater, passes through back pressure type
Steam turbine steam extraction regulation valve enters newly-increased final stage high-pressure heater, heats.General consideration unit, under frequent load, is carried on the back
The throttling of pressure type steam turbine steam extraction regulation valve all discharges, therefore the load stage below this load, under feed temperature occurs
The flex point of fall, as it is shown in figure 5, oblique line portion is the effect of supplementary heating.
During high load capacity, control to go the pressure of drawing gas of the final stage high-pressure heater increased newly by back pressure turbine extraction control valve
Power, reaches the purpose keeping feed temperature stable, but when load is less than frequent load, back pressure turbine extraction control valve is opened
Foot, the extraction pressure of newly-increased final stage high-pressure heater declines and sliding pressure decline along with unit load, when arriving minimum Peak Load,
Extraction pressure no longer declines.By the method, the unit population mean feed temperature after technological transformation is made to improve a level, it is ensured that
The whole of SCR catalyst put into operation, and improve unit heat economy.
Simultaneously as have employed said method, feed temperature rises, and boiler export exhaust gas temperature also improves, and passes through equipment
And the Integration Design of system, the current policy of Appropriate application, unit denitration work in the range of operating load is carried out comprehensively.
The present invention passes through a newly-built back pressure unit, and the final stage high-pressure heater newly-increased for water supply system provides vapour source, with
This improves the feed temperature of boiler.Domestic also have use the filling mouth of former high pressure cylinder (high pressure cylinder only with Siemens technique have
This interface) access port of high pressure cylinder is supplied steam ports as external, for newly-increased high-pressure heater, the method is the most feasible, but access port
Merit conversion of energy, the problem that constantly need to monitor its reliability and safety in unit operation from now on.China or even the biggest
Most unit high pressure cylinders do not possess filling mouth, therefore, by the newly-built back pressure unit of the present invention, are the row improving boiler feed temperature
Effective way.
The water supply system of the former unit that present invention can apply to can be divided into single-row or biserial high-pressure heater water supply system.
The access feature of described newly-increased high-pressure heater is to improve feed temperature on the basis of former, and access way is flexible, described
The capacity of newly-increased high-pressure heater does not limits, and realizes required function by arranging of the equipment such as system and valve.
Compared with prior art, the invention have the benefit that 1. back pressure unit flexible arrangement.Back pressure unit does not set condensing
Device, unit load is light, can arrange near newly-increased final stage high-pressure heater, save the construction costs such as pipe-hanger support；2. carry on the back
Needed for the electricity that press group issues can be for unit station service, reduce unit station service power consumption rate；3. the raising of feed temperature, adds
Regenerative steam amount, decreases steam discharge loss, also improves the average endothermic temperature of boiler simultaneously, and the cycle efficieny of unit is carried
High；4. the raising of feed temperature, makes working medium caloric receptivity in boiler economizer reduce, and exhaust gas temperature raises, to boiler efficiency
Unfavorable, therefore, suitable technological transformation need to be carried out in economizer part, but denitration bringing normally into operation during underload need to be guaranteed；5. feed temperature
Raising, decrease water-cooling wall entrance and owe enthalpy, the most hydrodynamic stable, improve underload boiler operatiopn safety.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is the structural representation of the embodiment of the present invention 2.
Fig. 3 is the structural representation of the embodiment of the present invention 3.
Fig. 4 is the structural representation of the embodiment of the present invention 4.
Fig. 5 is the benefit figure of supplementary heating feedwater in the present invention.
Detailed description of the invention
Below in conjunction with detailed description of the invention and Figure of description, technical scheme is further explained in detail
Explanation.
Embodiment 1
As it is shown in figure 1, the present embodiment improves the device of boiler feed temperature, this device includes jet chimney 1, newly-increased final stage high pressure
Heater 2, back pressure type steam turbine electromotor 3 and back pressure turbine extraction control valve 4, the steam output end of described jet chimney 1
Mouth is connected with high pressure cylinder 5 entrance of back pressure type steam turbine electromotor 3, and described back pressure turbine extraction control valve 4 is arranged on newly-increased
On pipeline between final stage high-pressure heater 2 and high pressure cylinder 5；Described high pressure cylinder 5 is provided with high pressure extraction mouth 7 and steam drain 8, profit
With the vapour source of drawing gas of high pressure extraction mouth 7 on back pressure type steam turbine electromotor 3 by newly-increased final stage high-pressure heater 2 continue to add pyrogen to
The feedwater of the high-pressure heater 6 of water system, described in be used the pressure in the vapour source high-pressure heater Central Plains higher than former water supply system
The extraction pressure of final stage high-pressure heater, is adjusted to desirable pressure by back pressure turbine extraction control valve 4, described row
The steam discharge of steam ports 8 is connected to the cold reheaing steam pipe of main frame, flows to boiler reheater after converging with main frame high pressure cylinder steam discharge.This enforcement
Example improves the method for boiler feed temperature, comprises the following steps:
Step 1, the steam of described jet chimney 1 flow through back pressure type steam turbine successively send out from boiler main jet chimney, described steam
The high pressure cylinder 5 of motor 3, back pressure turbine extraction control valve 4 and newly-increased final stage high-pressure heater 2, enter newly-increased final stage high pressure
The steam of heater 2 be cooled to hydrophobic after, flow automatically step by step through the high-pressure heater 6 of former water supply system, eventually enter into oxygen-eliminating device；Separately
A part of steam continues what work done rear at back pressure type steam turbine electromotor 3, and steam drain is discharged the most finally, is connected to the cold reheating of main frame
Jet chimney, flows to boiler reheater after converging with main frame high pressure cylinder steam discharge；
Step 2, when use high pressure extraction mouth 7 vapour source continue to add pyrogen water supply system by newly-increased final stage high-pressure heater 2
The feedwater of high-pressure heater 6, described in be used the pressure in the vapour source high-pressure heater Central Plains final stage high pressure higher than former water supply system
The extraction pressure of heater, is adjusted to desirable pressure by back pressure turbine extraction control valve 4；
Present case is intended carrying out on 300MW unit, if high load capacity maintains former feed temperature, now, back pressure turbine draws gas tune
Joint valve 4 is closed, and main steam is done work through back pressure machine, it is desirable to generated energy is 10MW.
According to certain factory 300MW unit thermal balance, relevant parameter is as follows:
Main steam pressure 16.67Mpa,
Main steam temperature 538 DEG C,
Main steam enthalpy 3397.2kj/kg,
Cold reheated steam pressure 3.569Mpa,
Cold reheat steam temperature 320 DEG C,
Cold reheated steam enthalpy 3030.5 kj/kg,
The efficiency considering the electromotor of newly-built back pressure type unit is 98%, along with the development of technology, and current newly-built back pressure turbine
Steam end efficiency can be consistent with conventional steam turbine efficiency many years ago (through investigation, current 300MW in-service unit high pressure cylinder reality
Efficiency is substantially more than 80%), the generated energy being computed reaching 10MW needs main steam amount to be 100.2t/h.
If high load capacity need to improve former feed temperature on the basis of former, now, back pressure turbine extraction opening is to newly-increased final stage
Between high-pressure heater, the regulation valve on pipeline is in adjustment state, and main steam is done work through back pressure machine, it is desirable to generated energy is 10MW.
Former unit parameter is as follows:
Main steam pressure 16.67Mpa,
Main steam temperature 538 DEG C,
Main steam enthalpy 3397.2kj/kg,
Cold reheated steam pressure 3.569Mpa,
Cold reheat steam temperature 320 DEG C,
Cold reheated steam enthalpy 3030.5 kj/kg,
Feed pressure 18.44 Mpa,
Feed temperature 274.7 DEG C,
Feedwater flow 909t/h,
Enthalpy of Feed Water 1205.3 kj/kg.
After intending using back pressure type steam turbine generating set, feed temperature brings up to 294 DEG C, the steam end efficiency of newly-increased back pressure unit
Consistent with original high pressure cylinder, then the parameter of drawing gas of back pressure turbine:
Extraction pressure 7.9Mpa,
Extraction temperature 421.6 DEG C,
Draw gas enthalpy 3202.4 kj/kg,
The amount of drawing gas 45.5t/h.
The most also needing to meet back pressure type steam turbine generating set generated energy is 10MW, and total main steam flow is 121.5t/h.
During unit underload (as a example by 50% operating mode), plan feed temperature and promote on the basis of former, back pressure type steam turbine
Machine extraction opening is in adjustment state to the regulation valve increased newly between final stage high-pressure heater on pipeline, and main steam is through back pressure type steam turbine
Generating set does work, it is desirable to generated energy is 10MW.Former unit parameter is as follows:
Main steam pressure 11.45Mpa,
Main steam temperature 537 DEG C,
Main steam enthalpy 3452.3kj/kg,
Cold reheated steam pressure 1.912Mpa,
Cold reheat steam temperature 320 DEG C,
Cold reheated steam enthalpy 3038.1 kj/kg,
Feed temperature 236.3 DEG C,
Feedwater flow 462.8t/h,
Enthalpy of Feed Water 1021.8 kj/kg.
After intending using back pressure type steam turbine generating set, boiler feed temperature brings up to 260 DEG C, newly-increased back pressure type steam turbine generating
The steam end efficiency of unit is consistent with original high pressure cylinder, then the parameter of drawing gas of back pressure machine:
Extraction pressure 4.69Mpa,
Extraction temperature 403.7 DEG C,
Draw gas enthalpy 3223.6 kj/kg,
The amount of drawing gas 24.1t/h.
The most also needing to meet back pressure type steam turbine generating set generated energy is 10MW, and total main steam flow is 99.5t/h.
According to steam needed for current in-service 300MW B of Unit MCR evaporation capacity design load and actual motion value, above-mentioned each operating mode
Amount disclosure satisfy that requirement, and project alternative is feasible.
The required equipment increased of present case and expense are as follows:
Back pressure turbine (10MW) 10,000,000 yuan；
Electromotor and electrical equipment 3,000,000 yuan,
Final stage high-pressure heater 2,000,000 yuan,
System pipeline and valve and civil engineering equipment 3,000,000 yuan,
Total price: 18,000,000 yuan.
This back pressure type unit annual electricity generating capacity is 10000*6000=60000000 kilowatt hour, station service and cost of electricity-generating price difference
Being 0.15 yuan, year saves expense 60000000*0.15=900(ten thousand yuan)
Cost can reclaim in 1800/900=2.
Embodiment 2
As in figure 2 it is shown, the present embodiment improves the device of boiler feed temperature, this device includes jet chimney 1, newly-increased final stage high pressure
Heater 2, back pressure type steam turbine electromotor 3 and back pressure turbine extraction control valve 4, the steam output end of described jet chimney 1
Mouth is connected with high pressure cylinder 5 entrance of back pressure type steam turbine electromotor 3, and described back pressure turbine extraction control valve 4 is arranged on newly-increased
On pipeline between final stage high-pressure heater 2 and high pressure cylinder 5；Described high pressure cylinder 5 is provided with high pressure cylinder steam drain 9 and extraction opening
10, utilize the vapour source of high pressure cylinder steam drain 9 steam discharge of back pressure type steam turbine electromotor 3 to be continued by newly-increased final stage high-pressure heater 2
Add the feedwater of the high-pressure heater 6 of pyrogen water supply system, described in be used the pressure in vapour source and add higher than the high pressure of former water supply system
The extraction pressure of hot device Central Plains final stage high-pressure heater, is adjusted to required pressure by back pressure turbine extraction control valve 4
Power, the unnecessary steam of described high pressure cylinder steam drain 9 can be used for other users, and drawing gas of described extraction opening 10 is used for other
Family.
The present embodiment improves the method for boiler feed temperature, comprises the following steps:
Step 1, the steam of described jet chimney 1 flow through the high pressure of back pressure type steam turbine electromotor 3 successively from boiler, described steam
Cylinder 5, back pressure turbine extraction control valve 4 and newly-increased final stage high-pressure heater 2, enter the steaming of newly-increased final stage high-pressure heater 2
Vapour be cooled to hydrophobic after, flow automatically step by step through the high-pressure heater 6 of former water supply system, eventually enter into oxygen-eliminating device；
Step 2, when use high pressure steam drain 9 vapour source continue to add pyrogen water supply system by newly-increased final stage high-pressure heater 2
The feedwater of high-pressure heater 6, described in be used the pressure in the vapour source high-pressure heater Central Plains final stage high pressure higher than former water supply system
The extraction pressure of heater, is adjusted to desirable pressure by back pressure turbine extraction control valve 4, described extraction opening 10
Draw gas for other users.
Embodiment 3
As it is shown on figure 3, the present embodiment improves the device of boiler feed temperature, this device includes jet chimney 1, newly-increased final stage high pressure
Heater 2, back pressure type steam turbine electromotor 3 and back pressure turbine extraction control valve 4, the steam output end of described jet chimney 1
Mouth is connected with high pressure cylinder 5 entrance of back pressure type steam turbine electromotor 3, and described back pressure turbine extraction control valve 4 is arranged on newly-increased
On pipeline between final stage high-pressure heater 2 and high pressure cylinder 5；Described high pressure cylinder 5 is provided with high pressure extraction mouth 7 and steam drain 8, profit
With the vapour source of drawing gas of high pressure extraction mouth 7 on back pressure type steam turbine electromotor 3 by newly-increased final stage high-pressure heater 2 continue to add pyrogen to
The feedwater of the high-pressure heater 6 of water system, described in be used the pressure in the vapour source high-pressure heater Central Plains higher than former water supply system
The extraction pressure of final stage high-pressure heater, is adjusted to desirable pressure by back pressure turbine extraction control valve 4, described row
The steam discharge of steam ports 8 is used for other users.
As preferably, high pressure cylinder 5 described in the present embodiment is additionally provided with the sub-high pressure extraction opening 11 that several pressure taper off,
This draws gas for other purposes.
The present embodiment improves the method for boiler feed temperature, comprises the following steps:
Step 1, the steam of described jet chimney 1 flow through the high pressure of back pressure type steam turbine electromotor 3 successively from boiler, described steam
Cylinder 5, back pressure turbine extraction control valve 4 and newly-increased final stage high-pressure heater 2, enter the steaming of newly-increased final stage high-pressure heater 2
Vapour be cooled to hydrophobic after, flow automatically step by step through the high-pressure heater 6 of former water supply system, eventually enter into oxygen-eliminating device；Another part steam
Continuing what work done rear at back pressure type steam turbine electromotor 3, wherein some vapor can also be extracted out at several inter-stages subsequently,
Being supplied to other users use, final steam discharge also is used as other purposes；
Step 2, when use high pressure extraction mouth 7 vapour source continue to add pyrogen water supply system by newly-increased final stage high-pressure heater 2
The feedwater of high-pressure heater 6, described in be used the pressure in the vapour source high-pressure heater Central Plains final stage high pressure higher than former water supply system
The extraction pressure of heater, is adjusted to desirable pressure by back pressure turbine extraction control valve 4, described steam drain 8
Steam discharge is used for other users；
Step 3, when being additionally provided with the sub-high pressure extraction opening 11 that several pressure taper off on high pressure cylinder 5, this draws gas and may be used for it
His purpose.
Embodiment 4
As shown in Figure 4, the present embodiment improves the device of boiler feed temperature, and this device includes jet chimney 1, newly-increased final stage high pressure
Heater 2, back pressure type steam turbine electromotor 3 and back pressure turbine extraction control valve 4, the steam output end of described jet chimney 1
Mouth is connected with high pressure cylinder 5 entrance of back pressure type steam turbine electromotor 3, and described back pressure turbine extraction control valve 4 is arranged on newly-increased
On pipeline between final stage high-pressure heater 2 and high pressure cylinder 5；Described high pressure cylinder 5 is provided with high pressure cylinder steam drain 9, utilizes
The vapour source of high pressure steam drain 9 steam discharge of back pressure type steam turbine electromotor 3 is continued to add pyrogen by newly-increased final stage high-pressure heater 2 and is fed water
The feedwater of the high-pressure heater 6 of system, described in be used the pressure in the vapour source end, high-pressure heater Central Plains higher than former water supply system
The extraction pressure of level high-pressure heater, is adjusted to desirable pressure by back pressure turbine extraction control valve 4, described high pressure
The unnecessary steam of cylinder steam drain 9 can also be used for other users.
As preferably, high pressure cylinder 5 described in the present embodiment being additionally provided with several higher pressure extraction openings 11, this draws gas for it
His purpose.
The present embodiment improves the method for boiler feed temperature, comprises the following steps:
Step 1, the steam of described jet chimney 1 flow through the high pressure of back pressure type steam turbine electromotor 3 successively from boiler, described steam
Cylinder 5, back pressure turbine extraction control valve 4 and newly-increased final stage high-pressure heater 2, enter the steaming of newly-increased final stage high-pressure heater 2
Vapour be cooled to hydrophobic after, flow automatically step by step through the high-pressure heater 6 of former water supply system, eventually enter into oxygen-eliminating device；Described back pressure type vapour
High pressure cylinder 5 steam drain 9 of turbine generator 3 is used for increasing newly outside final stage high-pressure heater 2, and unnecessary steam can also be used for other and uses
Family.
Step 2, when use high pressure steam drain 9 vapour source continue to add the feedwater of the high-pressure heater 6 of pyrogen water supply system, institute
State the pressure the being used vapour source extraction pressure higher than the high-pressure heater Central Plains final stage high-pressure heater of former water supply system, pass through
Back pressure turbine extraction control valve 4 is adjusted to desirable pressure.
Step 3, when being additionally provided with several higher pressure extraction openings 11 on high pressure cylinder 5, this draws gas and may be used for other purposes.
The preferred embodiment of patent of the present invention described in detail above.Should be appreciated that the ordinary skill people of this area
Member just can make many modifications and variations according to the design of patent of the present invention without creative work.Therefore, all technology neck
In territory, technical staff passes through logical analysis, reasoning or limited reality on the basis of existing technology according to the design of patent of the present invention
Test available technical scheme, all should be in the protection domain being defined in the patent claims.
Claims (7)
1. the device improving boiler feed temperature, it is characterised in that this device includes that jet chimney (1), newly-increased final stage are high
Pressure heater (2), back pressure type steam turbine electromotor (3) and back pressure turbine extraction control valve (4), described jet chimney (1)
Steam output end mouth is connected with high pressure cylinder (5) entrance of back pressure type steam turbine electromotor (3), utilizes back pressure type steam turbine electromotor (3)
Draw gas or steam discharge, by newly-increased final stage high-pressure heater (2), add the feedwater of the high-pressure heater (6) of pyrogen water supply system, institute
State the pressure the being used vapour source extraction pressure higher than high-pressure heater (6) the Central Plains final stage high-pressure heater of former water supply system,
Described back pressure turbine extraction control valve (4) is arranged on the pipeline between newly-increased final stage high-pressure heater (2) and high pressure cylinder (5)
On.
The device of raising boiler feed temperature the most according to claim 1, it is characterised in that described high pressure cylinder sets on (5)
There are high pressure extraction mouth (7) and a steam drain (8), the vapour source of described high pressure extraction mouth (7), by newly-increased final stage high-pressure heater (2),
Continue to add the feedwater of the high-pressure heater (6) of pyrogen water supply system, described in be used the pressure in vapour source higher than former water supply system
The extraction pressure of high-pressure heater Central Plains final stage high-pressure heater, is adjusted by back pressure turbine extraction control valve (4)
To desirable pressure, the steam discharge of described steam drain (8) is used for other users.
The device of raising boiler feed temperature the most according to claim 1, it is characterised in that described high pressure cylinder sets on (5)
Having high pressure steam drain (9) and extraction opening (10), the vapour source of described high pressure steam drain (9), by newly-increased final stage high-pressure heater
(2), continue to add the feedwater of the high-pressure heater (6) of pyrogen water supply system, described in be used the pressure in vapour source higher than former to water system
The extraction pressure of the high-pressure heater Central Plains final stage high-pressure heater of system, by back pressure turbine extraction control valve (4) by it
Adjusting to desirable pressure, the unnecessary steam of described high pressure cylinder steam drain 9 is for other users, drawing gas of described extraction opening (10)
For other users.
The device of raising boiler feed temperature the most according to claim 2, it is characterised in that described high pressure cylinder (5) is upper also
Being provided with the sub-high pressure extraction opening (11) that several pressure taper off, this draws gas for other purposes.
The device of raising boiler feed temperature the most according to claim 3, it is characterised in that described high pressure cylinder (5) is upper also
Being provided with several higher pressure extraction openings (111), this draws gas for other purposes.
6. the method improving boiler feed temperature described in a claim 4 or 5, it is characterised in that comprise the following steps:
Step 1, described jet chimney (1) steam from boiler, described steam flows through back pressure type steam turbine electromotor (3) successively
High pressure cylinder (5), back pressure turbine extraction control valve (4) and newly-increased final stage high-pressure heater (2), enter newly-increased final stage high pressure and add
The steam of hot device (2) be cooled to hydrophobic after, flow automatically step by step through the high-pressure heater (6) of former water supply system, eventually enter into oxygen-eliminating device；
Another part steam continues what work done rear at back pressure type steam turbine electromotor (3), and wherein some vapor can also be at several
Inter-stage subsequently is extracted out, it is provided that use to other users, and final steam discharge is used as other purposes；
Step 2, when using the vapour source of high pressure extraction mouth (7), by newly-increased final stage high-pressure heater (2), continue to add pyrogen feedwater
The feedwater of the high-pressure heater (6) of system, described in be used the pressure in the vapour source high-pressure heater Central Plains higher than former water supply system
The extraction pressure of final stage high-pressure heater, is adjusted to desirable pressure by back pressure turbine extraction control valve (4), described
The steam discharge of steam drain (8) is used for other users；
Step 3, when using the vapour source of high pressure steam drain (9), by newly-increased final stage high-pressure heater (2), continue to add pyrogen feedwater
The feedwater of the high-pressure heater (6) of system, described in be used the pressure in the vapour source high-pressure heater Central Plains higher than former water supply system
The extraction pressure of final stage high-pressure heater, is adjusted to desirable pressure by back pressure turbine extraction control valve (4), described
The unnecessary steam of high pressure cylinder steam drain (9) is for other users, drawing gas for other users of described extraction opening (10)；
Step 4, when being additionally provided with the sub-high pressure extraction opening (11) that several pressure taper off on high pressure cylinder (5), this draws gas for it
His purpose.
7. step 5, when being additionally provided with several higher pressure extraction openings (111) on high pressure cylinder (5), this draws gas and may be used for other mesh
's.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610806252.2A CN106224935A (en) | 2016-09-07 | 2016-09-07 | Improve the devices and methods therefor of boiler feed temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610806252.2A CN106224935A (en) | 2016-09-07 | 2016-09-07 | Improve the devices and methods therefor of boiler feed temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106224935A true CN106224935A (en) | 2016-12-14 |
Family
ID=58074078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610806252.2A Pending CN106224935A (en) | 2016-09-07 | 2016-09-07 | Improve the devices and methods therefor of boiler feed temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106224935A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107388230A (en) * | 2017-08-31 | 2017-11-24 | 冯煜珵 | A kind of joint backheating system |
| CN107388231A (en) * | 2017-08-31 | 2017-11-24 | 冯煜珵 | A kind of heat regenerative system |
| CN108131174A (en) * | 2018-02-06 | 2018-06-08 | 西安热工研究院有限公司 | A kind of heat regenerative system based on back pressure turbine |
| CN109241573A (en) * | 2018-08-09 | 2019-01-18 | 国电南京电力试验研究有限公司 | A kind of last stage vane of steam turbine selection method |
| CN114383129A (en) * | 2021-12-09 | 2022-04-22 | 广西电网有限责任公司电力科学研究院 | Method for adjusting main steam temperature of boiler with four tangential points of coal-electric machine set |
| CN114413251A (en) * | 2021-12-09 | 2022-04-29 | 广西电网有限责任公司电力科学研究院 | System for adjusting main steam temperature of Pi type hedging once-through boiler |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8091361B1 (en) * | 2007-11-05 | 2012-01-10 | Exergetic Systems, Llc | Method and apparatus for controlling the final feedwater temperature of a regenerative Rankine cycle using an exergetic heater system |
| CN102537933A (en) * | 2011-12-30 | 2012-07-04 | 冯伟忠 | Adjustable feed water heat regenerative system for turbo generator unit |
| CN206094020U (en) * | 2016-09-07 | 2017-04-12 | 上海量朝能源科技有限公司 | Improve device of boiler feed water temperature |
-
2016
- 2016-09-07 CN CN201610806252.2A patent/CN106224935A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8091361B1 (en) * | 2007-11-05 | 2012-01-10 | Exergetic Systems, Llc | Method and apparatus for controlling the final feedwater temperature of a regenerative Rankine cycle using an exergetic heater system |
| CN102537933A (en) * | 2011-12-30 | 2012-07-04 | 冯伟忠 | Adjustable feed water heat regenerative system for turbo generator unit |
| CN206094020U (en) * | 2016-09-07 | 2017-04-12 | 上海量朝能源科技有限公司 | Improve device of boiler feed water temperature |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107388230A (en) * | 2017-08-31 | 2017-11-24 | 冯煜珵 | A kind of joint backheating system |
| CN107388231A (en) * | 2017-08-31 | 2017-11-24 | 冯煜珵 | A kind of heat regenerative system |
| CN108131174A (en) * | 2018-02-06 | 2018-06-08 | 西安热工研究院有限公司 | A kind of heat regenerative system based on back pressure turbine |
| CN109241573A (en) * | 2018-08-09 | 2019-01-18 | 国电南京电力试验研究有限公司 | A kind of last stage vane of steam turbine selection method |
| CN109241573B (en) * | 2018-08-09 | 2022-12-09 | 国能南京电力试验研究有限公司 | Steam turbine last stage blade model selection method |
| CN114383129A (en) * | 2021-12-09 | 2022-04-22 | 广西电网有限责任公司电力科学研究院 | Method for adjusting main steam temperature of boiler with four tangential points of coal-electric machine set |
| CN114413251A (en) * | 2021-12-09 | 2022-04-29 | 广西电网有限责任公司电力科学研究院 | System for adjusting main steam temperature of Pi type hedging once-through boiler |
| CN114413251B (en) * | 2021-12-09 | 2023-10-27 | 广西电网有限责任公司电力科学研究院 | System for adjusting main steam temperature of Pi-type opposite-flow direct-current boiler |
| CN114383129B (en) * | 2021-12-09 | 2023-10-31 | 广西电网有限责任公司电力科学研究院 | Method for adjusting main steam temperature of four-corner tangential boiler of coal motor group |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106224935A (en) | Improve the devices and methods therefor of boiler feed temperature | |
| Yan et al. | Evaluation of solar aided thermal power generation with various power plants | |
| CN100354504C (en) | Multi-grade using backheating drain residual heat generator of thermal power generator set | |
| CN102537933B (en) | Adjustable feed water heat regenerative system for turbo generator unit | |
| US8839621B2 (en) | Hybrid power plant | |
| CN110207092B (en) | Thermal power generating unit power generation peak regulation system and method based on steam total heat heating fused salt heat accumulation | |
| CN104976671B (en) | Wide-load heat supply energy-saving system of back pressure type small steam turbine driven water feeding pump | |
| CN112856363B (en) | System and method for improving heat supply steam parameters of deep peak shaving heat supply unit | |
| CN104153832B (en) | A kind of iron and steel enterprise's complementary energy synthesis efficient electric power generation method and power generation system thereof | |
| CN103696816A (en) | Intermediate reheating small-capacity split axle type steam-turbine generator set | |
| Jiang et al. | Thermal performance study of tower solar aided double reheat coal-fired power generation system | |
| CN106437875A (en) | Thermal power generating unit working medium shunting circulation peak shaving system | |
| CN113175367B (en) | Master control system for improving peak regulation capacity and flexibility of unit and operation method | |
| CN103982252A (en) | Novel process combination of high-speed and efficient single reheating steam turbine and power generation of small power plant | |
| CN206092088U (en) | Matching unit of coal -fired power unit heat supply parameter | |
| CN202852791U (en) | Adjustable feed water heat regenerative system for turbo generator unit | |
| CN105042666B (en) | Wide-load heat supply energy-saving system of back pressure type small steam turbine driven draught fan | |
| CN204730670U (en) | A kind of residual heat and energy comprehensive utilization TRT | |
| CN206094020U (en) | Improve device of boiler feed water temperature | |
| CN114251139B (en) | Unit thermal power generation unit neighbor quick start system | |
| CN202732010U (en) | Combination thermal system of thermal power plant and thermal power plant | |
| CN109869205A (en) | It is a kind of for the heat accumulation of cogeneration units, power generation and heating system | |
| CN113494321B (en) | High-pressure cylinder zero-output-force-based bus pipe connection system and operation method | |
| CN108487955A (en) | System and method is utilized based on the coal gas synergy that steam parameter is promoted | |
| CN204960997U (en) | Waste heat turbo generator set |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161214 |