CN202852791U - Adjustable feed water heat regenerative system for turbo generator unit - Google Patents
Adjustable feed water heat regenerative system for turbo generator unit Download PDFInfo
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- CN202852791U CN202852791U CN 201120573977 CN201120573977U CN202852791U CN 202852791 U CN202852791 U CN 202852791U CN 201120573977 CN201120573977 CN 201120573977 CN 201120573977 U CN201120573977 U CN 201120573977U CN 202852791 U CN202852791 U CN 202852791U
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Abstract
The utility model provides an adjustable feed water heat regenerative system for a turbo generator unit which at least includes a high pressure cylinder of a steam turbine, a steam extraction pipe, a final-stage feed water heater taking the additionally extracted steam of the high pressure cylinder as a heat source, and a regulating valve arranged on the steam extraction pipe; and further comprises a final-stage steam extraction opening additionally arranged on the high pressure cylinder; and an additionally arranged final-stage steam extraction pipe and a final-stage feed water heater; wherein the final-stage steam extraction pipe is connected with the final-stage steam extraction opening and the final-stage feed water heater, part of steam which does work in the high pressure cylinder is guided to the final-stage feed water heater through the final-stage steam extraction opening and the steam extraction pipe, in addition, the system provided includes a steam extraction regulating valve which is arranged on the additionally arranged final-stage steam extraction pipe. The heat regenerative system provided is a flexible heat regenerative system. The temperature of the feed water can be maintained or changed under the variable load condition of the unit, so that the environmental friendliness, the economy and the safety of the unit are improved and the frequency modulation characteristic is perfected.
Description
Technical field
The utility model relates to a kind of adjustable feed water heat regenerative, is used for Turbo-generator Set.
Background technology
In recent years, along with the fast development of China's economy and significantly improving of living standards of the people, every profession and trade productive power and people's livelihood electricity consumption all increase rapidly, the electrical network peak-valley difference sharply strengthens, for safe power supply and the quality of power supply that guarantees electrical network, electrical network must have enough peak modulation capacities, and can meet the peak again can be with regard to low ebb.In China, owing to the coal fired power generation unit has accounted for more than 73% in whole generating total installed capacity, thereby make the large electric power plant unit have to bearing the task that electrical network enlarges peak modulation capacity, thereby often be in the different load stage running.Simultaneously, coal fired thermal power plant is again the pollutant emission rich and influential family, and the flue gas desulfurization of thermal power plant, denitration have become an important process of China's " energy-saving and emission-reduction ".For denitration technology, SCR method (selective catalytic reduction) is to use in the world maximum, that technology is the most ripe a kind of gas denitrifying technologies at present.Adopt the denitration of SCR method, when boiler is in underrun, it is interval that the reactor inlet temperature of SCR denitrating system may drop to the operating temperature that is lower than catalyst, the SCR denitrating system operation of just having to withdraw from this moment, the SCR denitrating system of generally just stopping transport below 60% rated load.And unit load is lower, and the pollutant NOx value of generation is higher, and this moment, denitrating system was out of service.Will participate in the present situation of peak regulation according to the present large electric power plant unit of China, unit often many times is in the underrun state.Thereby under existence conditions, the denitrating system utilization rate is not high, and therefore the unit Environmental Protection Level also gives a discount.
Simultaneously, because unit variable load operation, when unit is in underload, extraction pressure reduces, and corresponding feed temperature reduces, and causes the average endothermic temperature of boiler to reduce, thereby reduced the thermodynamic cycle thermal efficiency of unit, unit economy is reduced, and under the equal generated energy, the corresponding pollutant discharge amount of inefficient unit will increase relatively.
In addition, because unit needs variable load operation, the main steam control valve of steam turbine often is in throttle, and this has increased the loss in efficiency of unit.Especially to large-scale high parameter direct current cooker, because its amount of stored heat is little, the Load Regulation response characteristic is poor on the one hand; On the other hand, because the quick variation of load causes the boiler pressure respective change, the vapor (steam) temperature of carbonated drink temperature and follow-up heating surface also changes fast in the water-cooling wall then, thereby the thermograde of the inside and outside wall of these heating surfaces is sharply changed, and produces stress impact.Because the high pressure high temperature turbosets heating surface adopts steel alloy mostly, be subjected to the restriction of material, the design safety nargin of its material own is little, thereby frequency modulation causes the frequent variations of heating surface temperature to affect the service life of equipment, and there is potential safety hazard in boiler operatiopn.
Therefore, those skilled in the art is devoted to develop a kind of adjustable feed water heat regenerative, the discharging of pollutant when reducing unit operation, and the economy when improving variable load operation, and improve the unit frequency modulation characteristic to satisfy the requirement of electrical network frequency modulation.
The utility model content
Because the defects of prior art, to be solved in the utility model is the unit problem that denitrating system need to be stopped transport when being in low load condition, improves simultaneously the underload economy of unit, improves the frequency modulation characteristic of unit.
For achieving the above object, the utility model provides a kind of adjustable feed water heat regenerative for Turbo-generator Set, at least comprise steam turbine high pressure cylinder, extraction line, draw gas as the final stage feed-water heater of thermal source and the control valve on the described extraction line take setting up of described high pressure cylinder, also comprise: the final stage extraction opening of setting up at described high pressure cylinder; The final stage extraction line of setting up and final stage feed-water heater, described final stage extraction line links to each other with described final stage extraction opening and described final stage feed-water heater; A part of steam of doing merit in the described high pressure cylinder causes described final stage feed-water heater by described final stage extraction opening and described extraction line, in order to further heating boiler feedwater; And extraction control valve, described extraction control valve is installed on the described final stage extraction line of setting up, and is used for that drawing gas of described final stage extraction line carried out throttling and regulates.
In the utility model preferred embodiment, described final stage feed-water heater and prime feed-water heater are connected in series.
Adjustable feed water heat regenerative of the present utility model is a kind of effective measures that can keep or change feed temperature under unit varying duty state, thereby improve the unit feature of environmental protection, economy and security and improve frequency modulation characteristic, become a kind of elasticity heat regenerative system, have the following advantages and technique effect:
(1) because under different load, average feed temperature can be kept basically identical, thereby under underload, feed temperature significantly improves relatively, and flue-gas temperature also raises relatively behind the economizer, even it is still higher to enter like this entrance flue gas temperature of denitrating system reactor under underload, can make the operating temperature of catalyst still in normal interval, it is out of service that this can make denitrating system (SCR) no longer need, and greatly improved the utilization rate of denitrating system, significantly promoted the Environmental Protection Level of unit.
(2) when underrun, the use of elasticity heat regenerative system has increased the regenerative steam amount, has reduced cold source energy; Feed temperature improves relatively, has improved the average endothermic temperature of boiler; Thereby the unit thermal efficiency of cycle is improved.In addition, the increase of regenerative steam, the corresponding main steam flow that has increased under the equal load, for the unit of sliding pressure operation, main steam pressure also can improve relatively, so average also corresponding raising of endothermic temperature, unit efficiency also is improved.Obviously load is lower, and the benefit that this utility model technology obtains relatively is larger.Along with improving constantly of unit parameter, the also corresponding raising of the effective enthalpy drop of the unit that draws gas is so that the marginal benefit that the utility model produces increases.
(3) there are certain interval in the rotating part of rotary regenerative air preheater and standing part, after being heated, rotor can produce mushroom-shaped distortion, the gap is increased, and particularly for adopting cold junction to seal the not boiler of regulative mode, the air leak rate of air curtain of underload can increase along with the increase in cold junction gap.After adopting elasticity heat regenerative system of the present utility model, feed temperature when underrun improves relatively, flue-gas temperature also raises relatively behind the economizer, and namely when different underrun, the flue-gas temperature that enters air preheater changes little relatively, thereby the variation of the deflection of air preheater is little, its gap of leaking out changes little relatively, and air leak rate of air curtain is relatively low, thereby has relatively promoted the air preheater heat exchange efficiency, thereby improved boiler efficiency, simultaneously relative reduce power of fan consumption.
(4) because feed temperature when underrun improves relatively, and flue-gas temperature also raises relatively behind the economizer, and the flue-gas temperature that enters air preheater is raise relatively, thereby make relative raising of hot blast temperature of wind and Secondary Air.This has improved the drying capacity of pulverized coal preparation system on the one hand, has improved again on the other hand the low-load combustion-stabilizing performance of boiler, has improved the boiler operatiopn security.
(5) for direct current cooker, water-cooling wall exists the instability problem of hydrodynamic characterisitic, and especially when underrun, hydrodynamic characterisitic is more unstable.After adopting elasticity heat regenerative system of the present utility model, feed temperature improves relatively, has reduced the water-cooling wall entrance and has owed enthalpy, is conducive to hydrodynamic stablizing, thus the underrun security that has improved boiler.
(6) adopt elasticity heat regenerative system of the present utility model after, in frequency-modulating process, can change by the adjusting transient state work done that the temporal variations amount regulates steam turbine of drawing gas, thus the power output of corresponding change generator.Then the amount of drawing gas recovers normal after the boiler heat load adjusting puts in place.Because feed temperature finally remains unchanged, based on the huge heat storage capacity of boiler economizer, thereby the economizer exit temperature can be substantially constant, and the ordinary steels that adopt such as feed piping and economizer, its thermal stress that can bear is much larger than steel alloy. moreThereby can improve the frequency modulation economy of steam turbine, the variable load operation security of boiler and the service life of equipment.
In addition, elasticity heat regenerative system of the present utility model also has other advantages such as the reheater of minimizing pressure drop.
Be described further below with reference to the technique effect of accompanying drawing to design of the present utility model, concrete structure and generation, to understand fully the purpose of this utility model, feature and effect.
Description of drawings
Fig. 1 is the principle schematic of embodiment of the present utility model;
Fig. 2 is the structural representation of a specific embodiment of the utility model.
The specific embodiment
Elasticity heat regenerative system of the present utility model is on existing heat regenerative system basis, sets up the higher extraction opening of an extraction pressure and corresponding extraction line and set up a high-pressure feed-water heater at high pressure cylinder to form.A part of steam that merit will be done by this system causes this feed-water heater by the extraction line of setting up, feedwater in order to heating boiler, and its hydrophobic prime feed-water heater that flows to, and the extraction line installation one extraction regulation valve of setting up, regulate drawing gas, pressure can keep extraction control valve in common load variations scope after is substantially constant, and is substantially constant to keep feed temperature.The utility model is numbered to the order to feed-water heater by feedwater flow, so this high-pressure feed-water heater is called again the final stage feed-water heater, correspondingly, extraction opening and the extraction line corresponding to the final stage feed-water heater is called final stage extraction opening and final stage extraction line.
Existing heat regenerative system is shown in the dotted line frame among Fig. 1.Prime feed-water heater 5 refers to existing feed-water heater in the existing heat regenerative system 10, and it may be one or more feed-water heaters, and the feedwater B of boiler is heated.Prime feed-water heater 5 links to each other by extraction line 3 with high pressure cylinder 1, if when prime feed-water heater 5 is a plurality of feed-water heater, extraction line 3 also correspondingly is many pipelines that link to each other with high pressure cylinder 1.
Adopted two different terms of control valve and block valve to describe the fluid control device of each pipeline in the utility model, wherein control valve represents that its aperture can regulate, and block valve then only has standard-sized sheet and complete shut-down two states under normal circumstances.
The position of final stage extraction opening 20 is compared with the existing extraction opening of high pressure cylinder 2 positions, and more close main steam inlet A is to obtain higher extraction pressure.
The technical scheme that the utility model is taked as shown in Figure 1, the elasticity heat regenerative system that installs additional is comprised of control valve 31 and final stage feed-water heater 50 on a final stage extraction opening 20 of setting up at high pressure cylinder 1, final stage extraction line 30, the extraction line.
During any steady load in the load variations scope of setting, by the regulating action of control valve 31, the extraction pressure that can keep behind the control valve 31 is substantially constant, thereby the outlet feed temperature that guarantees final stage feed-water heater 50 is substantially constant.When participating in frequency modulation, by the temporal variations amount of drawing gas that control valve 31 controls enter final stage feed-water heater 50, the transient state work done of regulating steam turbine changes: when burden requirement reduces, drive large control valve 31 until standard-sized sheet increases the amount of drawing gas; Otherwise, when requiring load up, then turn down control valve 31, the amount of drawing gas is reduced, squeeze high pressure cylinder 1 doing work that draws gas back.Add at frequency modulation, in the load shedding because symmetry, the change of the turbine efficiency that the change of the amount of drawing gas causes can be cancelled out each other, its mean value is constant, so frequency modulation itself does not affect the economy of unit.
Because when different load moves, feed temperature improves relatively, unit economy is corresponding raising also, it is lower to load, feed temperature improves larger relatively, thereby the benefit that relatively obtains is also just higher, calculates as example take the 500MW operating mode of certain 1000MW ultra supercritical unit, and the relevant design data are as shown in table 1 under the original system 500MW operating mode:
Table 1 original system relevant design data
| Operating mode (MW) | 500 |
| Feed pressure (bar) | 156.44 |
| Feed temperature (℃) | 249.2 |
| Main steam flow (kg/s) | 358.819 |
| Main steam pressure (bar) | 126.54 |
| Main steam temperature (℃) | 600 |
| Exhaust temperature of HP (℃) | 376.7 |
| Reheated steam flow (kg/s) | 313.52 |
| Cold again steam pressure (bar) | 29.98 |
[0029]?
| Cold again vapor (steam) temperature (℃) | 376.7 |
| Heat is steam pressure (bar) again | 26.91 |
| Heat again vapor (steam) temperature (℃) | 600 |
| Hear rate (KJ/KWH) | 7658 |
After installing the elasticity heat regenerative system additional, 500MW operating mode relevant design data are as shown in table 2:
Table 2 System Dependent design data of the present utility model
| Operating mode (MW) | 500 |
| Feed pressure (bar) | 163.64 |
| Feed temperature (℃) | 289.8 |
| Main steam flow (kg/s) | 386.493 |
| Main steam pressure (bar) | 131.44 |
| Main steam temperature (℃) | 600 |
| Exhaust temperature of HP (℃) | 369.3 |
| Reheated steam flow (kg/s) | 308.701 |
| Cold again steam pressure (bar) | 29.45 |
| Cold again vapor (steam) temperature (℃) | 369.3 |
| Heat is steam pressure (bar) again | 26.45 |
| Heat again vapor (steam) temperature (℃) | 600 |
| Final stage feedwater heating extraction flow (kg/s) | 33.93 |
| Final stage feedwater heating extraction pressure (bar) | 72.33 |
| Final stage feedwater heating extraction temperature (℃) | 516.4 |
| Hear rate (KJ/KWH) | 7611 |
By table 1 and table 2 contrast, can find out that after installing the elasticity heat regenerative system additional under the 500MW operating mode, main steam flow and main steam pressure be corresponding lifting all, exhaust temperature of HP and reheated steam flow all corresponding decline, especially feed temperature have raise 40.6 ℃ relatively.Total comprehensive benefit is steam turbine hear rate decline 47KJ/KWH.
The connected mode of elasticity heat regenerative system can be flexible and changeable, and following specific embodiment just to the illustrating of the connected mode of elasticity heat regenerative system, should not regarded as restriction of the present utility model.
As shown in Figure 2, the elasticity heat regenerative system that installs additional is connected with prime feed-water heater 5 by final stage feed-water heater 50, and design is the full load flow by the feedwater flow of final stage feed-water heater 50.The high bypass 40 formation bypass channels that strengthen, as safety measure, in parallel with final stage feed-water heater 50 and at least one prime feed-water heater 5 of being cascaded.The high increasing in the bypass 40 is equipped with the by-pass valve control (not shown).When any steady load, control the amount of drawing gas that enters the final stage feed-water heater by control and regulation valve 31, add at frequency modulation, in the load shedding, because symmetry, the change of the unit efficiency that the change of the amount of drawing gas that change affects of feedwater flow causes can be cancelled out each other, and its mean value is constant.
The method of operation:
When (1) the normal operation of elasticity heat regenerative system and participation unit frequency modulation moved, control valve 31 was reserved certain throttle in advance, and the large I of the aperture of control valve 31 is followed load variations and changed.When burden requirement reduces, then drive large control valve 31 until standard-sized sheet increases the amount of drawing gas, thereby reduce the transient state capacity for work; Otherwise, when requiring load up, then turn down control valve 31, the amount of drawing gas is reduced, squeeze high pressure cylinder 1 doing work that draws gas back.
(2) the elasticity heat regenerative system is isolated: consider from the unit safety perspective, need to stop transport in case the elasticity heat regenerative system goes wrong that feedwater is through too high increasing bypass 40 operations.
More than describe preferred embodiment of the present utility model in detail.The ordinary skill that should be appreciated that this area need not creative work and just can make many modifications and variations according to design of the present utility model.Therefore, all in the art technical staff comply with design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in the determined protection domain by claims.
Claims (2)
1. adjustable feed water heat regenerative that is used for Turbo-generator Set, at least comprise steam turbine high pressure cylinder, extraction line, draw gas as the final stage feed-water heater of thermal source and the control valve on the described extraction line take setting up of described high pressure cylinder, it is characterized in that, also comprise:
The final stage extraction opening of setting up at described high pressure cylinder;
The final stage extraction line of setting up and final stage feed-water heater, described final stage extraction line links to each other with described final stage extraction opening and described final stage feed-water heater; A part of steam of doing merit in the described high pressure cylinder causes described final stage feed-water heater by described final stage extraction opening and described extraction line, in order to further heating boiler feedwater; And
Extraction control valve, described extraction control valve are installed on the described final stage extraction line of setting up, and are used for that drawing gas of described final stage extraction line carried out throttling and regulate.
2. the adjustable feed water heat regenerative for Turbo-generator Set as claimed in claim 1, it is characterized in that: described final stage feed-water heater and prime feed-water heater are connected in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201120573977 CN202852791U (en) | 2011-12-30 | 2011-12-30 | Adjustable feed water heat regenerative system for turbo generator unit |
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| CN 201120573977 CN202852791U (en) | 2011-12-30 | 2011-12-30 | Adjustable feed water heat regenerative system for turbo generator unit |
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| CN202852791U true CN202852791U (en) | 2013-04-03 |
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| CN 201120573977 Expired - Lifetime CN202852791U (en) | 2011-12-30 | 2011-12-30 | Adjustable feed water heat regenerative system for turbo generator unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705019A (en) * | 2016-12-07 | 2017-05-24 | 上海电气电站设备有限公司 | Wide-load efficient water supply regenerative system |
| WO2019042019A1 (en) * | 2017-08-31 | 2019-03-07 | 冯煜珵 | Combined regeneration device |
| WO2019042020A1 (en) * | 2017-08-31 | 2019-03-07 | 冯煜珵 | Heat recovery device |
| WO2019042021A1 (en) * | 2017-08-31 | 2019-03-07 | 冯煜珵 | Adjustable combined regeneration device |
-
2011
- 2011-12-30 CN CN 201120573977 patent/CN202852791U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705019A (en) * | 2016-12-07 | 2017-05-24 | 上海电气电站设备有限公司 | Wide-load efficient water supply regenerative system |
| WO2019042019A1 (en) * | 2017-08-31 | 2019-03-07 | 冯煜珵 | Combined regeneration device |
| WO2019042020A1 (en) * | 2017-08-31 | 2019-03-07 | 冯煜珵 | Heat recovery device |
| WO2019042021A1 (en) * | 2017-08-31 | 2019-03-07 | 冯煜珵 | Adjustable combined regeneration device |
| US11092040B2 (en) | 2017-08-31 | 2021-08-17 | Yucheng FENG | Combined heat recovery device |
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Granted publication date: 20130403 |