CN107218093B - A kind of thermal power plant's steam exhaust recycling heating system and operation method - Google Patents
A kind of thermal power plant's steam exhaust recycling heating system and operation method Download PDFInfo
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Abstract
A kind of thermal power plant's steam exhaust recycling heating system, including two steam turbines and corresponding two condensers, steam exhaust extraction system, steam exhaust recycling system, joint water conservancy project system；Using steam exhaust extraction system, trepanning extracts steam exhaust on two condensers respectively, is pipelined to steam exhaust header；Joint water conservancy project system includes the first steam exhaust condenser, the second steam exhaust condenser, increases steam turbine condenser；Steam exhaust header divides the first steam exhaust of two-way piping connection condenser, the second steam exhaust condenser；Steam exhaust header increases steam turbine condenser through steam exhaust recycling system piping connection；Joint water conservancy project system access heating network realizes that exhaust steam in steam turbine is utilized by high efficiente callback, and energy-saving benefit maximizes so that entire therrmodynamic system parameter matching is most reasonable, and the method for operation is best.
Description
Technical field
The invention belongs to power plant for energy conservation fields, and in particular to a kind of thermal power plant's steam exhaust recycling heating system.
Background technology
It is well known that the cold end loss of thermal power plant Rankine cycle, accounts for 50% or more of entire power plant's energy loss.
Either Direct Air-Cooled, indirect air cooling or water cooling Steam Turbine, after steam turbine acting entrained by the steam exhaust that is discharged
Amount of heat (the steam latent heat of vaporization) is wasted in vain, (electricity), water consumption moreover, cooling steam exhaust must consume energy.
If steam turbine of thermal power plant steam exhaust can be recycled, amount of heat (the steam latent heat of vaporization) can be not only recycled,
Moreover, the power consumption water consume of cooling steam exhaust can save.
Recycle Direct Air-Cooled, the exhaust steam heat energy of indirect air cooling or water cooling Steam Turbine reduces cold end to heat supply network heat supply
Loss, is a very effective energy saving means.
Invention content
It is an object of the invention to high efficiente callback steam turbine of thermal power plant steam exhaust, provide a kind of thermal power plant's steam exhaust recycling heat supply system
System is suitable for newly-built and reconstruction power plant.
Heating system, including two steam turbines and corresponding two condensers are recycled in a kind of thermal power plant's steam exhaust, steam exhaust extraction system, weary
Vapour recycling system, joint water conservancy project system；Two steam turbines have different operation back pressures, respectively high back pressure steam turbine, the low back of the body
Press steam turbine；It is characterized in that：Using steam exhaust extraction system, trepanning extracts steam exhaust on two condensers respectively, passes through pipe
Road is transported to steam exhaust header；Joint water conservancy project system includes the first steam exhaust condenser, the second steam exhaust condenser, increases steam turbine condenser；
Steam exhaust header divides the first steam exhaust of two-way piping connection condenser, the second steam exhaust condenser；Steam exhaust header is recycled through steam exhaust
Piping connection of uniting increases steam turbine condenser；Joint water conservancy project system access heating network.
The operation method of heating system is recycled based on thermal power plant's steam exhaust, which is characterized in that the steam exhaust of steam turbine of thermal power plant group
After being introduced to steam exhaust header, according to heated type condenser system configuring condition and carbonated drink parameter match condition, steam exhaust is carried out
Multichannel process recycles steam exhaust heat；
The roads A：Low parameter steam exhaust is directly entered the first steam exhaust condenser, for heating heat supply network return water；
The roads B：The steam exhaust of high parameter is directly entered the second steam exhaust condenser as heat source, continues to heat the first steam exhaust condensing
Device comes out heat supply network return water；
The roads C：Using high back pressure Steam Turbine Through IP Admission steam discharge as steam turbine power steam is increased, the steam exhaust of high parameter is aspirated, is increased
Steam turbine steam discharge enters increasing steam turbine condenser, continues the second steam exhaust condenser of heating and comes out heat supply network return water；
Just end is trembled with fear the phase in winter, and three-level heat hot water is provided to heat supply heat supply network；
Algid stage in winter, when Heating Season is run, high back pressure Steam Turbine Through IP Admission steam discharge and low back pressure turbine intermediate pressure cylinder
Steam discharge respectively enters heat exchangers for district heating, and heating increases steam turbine condenser and comes out heat supply network return water；After level Four heats, hot net water reaches
Required heating temperature, is sent to outside networks of heat supply.
Through the above technical solutions, realizing that steam exhaust is utilized by high efficiente callback, energy-saving benefit maximizes, meanwhile, in entire heat
In Force system, parameter matching is most reasonable, and the method for operation is best, and multiple functional complete, Operation and Maintenance is simple, and cost of investment is few, fortune
Row is safe and reliable.
Description of the drawings
Fig. 1 is thermal power plant's steam exhaust recycling heating system schematic diagram；
Steam discharge in wherein 1 high back pressure steam turbine, steam discharge in 2 low back pressure turbines, 3 high back pressure turbine low pressure cylinders, the 4 low back ofs the body
Turbine low pressure cylinder is pressed, 5 high back pressure turbine condensers, 6 low back pressure turbine condensers, 7 increase steam turbine, 8 heat supply network cyclic water outlets
Pipe, 9 heat supply network recirculation return pipes, 10 heat exchangers for district heatings, 11 increase steam turbine condenser, 12 second steam exhaust condensers, and 13 first steam exhaust are coagulated
Vapour device, 14 steam exhaust headers, 15 steam exhaust header control valves, 16-19 pipe-line control valve doors.
Specific implementation mode
1 the invention will be further described below in conjunction with the accompanying drawings, it should be understood that content described herein is merely to illustrate
It is of the invention with explaining, it is not intended to limit the present invention.
Embodiment one：
The installation of certain power plant is 2X600MW grades of indirect air cooling units, and the steam exhaust of two steam turbines is utilized simultaneously.
Heating system, including two steam turbines and corresponding two condensers, steam exhaust extraction system, steam exhaust are recycled in its thermal power plant's steam exhaust
Recycling system, joint water conservancy project system；
Two steam turbines have different operation back pressures, respectively high back pressure steam turbine, low back pressure turbine.For example, two
600MW level steam turbine groups, two 600MW indirect air cooling units are run simultaneously.When winter operation, wherein a turbine back pressure is
10.5KPa is run, and another turbine back pressure runs for 20KPa.(10.5KPa and 20KPa, it is only for narration it is convenient and
Illustrated example.The configuration mode of other parameters is also in the application protection domain).The steam exhaust of two units is all recycled.
Using steam exhaust extraction system, opened from 1#600MW level steam turbines condenser and 2#600MW turbine condensers respectively
Hole extracts the steam exhaust of two indirect air coolings, is pipelined to steam exhaust header (main pipe).Steam exhaust extraction system includes weary
Vapour draws special parts, pipeline and steam exhaust header (main pipe) are drawn in steam exhaust；Steam exhaust draws special parts and is fixedly installed in condenser throat
On side, steam exhaust, which is drawn, is arranged steam exhaust fairlead on throat's side plate that special parts are surrounded, in the condenser throat side of trepanning
Reinforcement structure is arranged in side, and steam exhaust deflector is arranged on the inside of steam exhaust fairlead；Steam exhaust draws special parts and draws pipeline company by steam exhaust
Connect steam exhaust header；Steam exhaust fairlead is equipped with control valve.Steam exhaust extraction system is by (Direct Air-Cooled, indirect air cooling, water cooling) vapour
Turbine discharge is extracted from condenser or blow-off line, and control steam exhaust is discharged into the amount of Air-Cooling Island or condenser.
Steam exhaust header is equipped with valve, forms two-stage structure.One section is connected with 10.5KPa steam exhaust, and the other end is weary with 20KPa
Vapour phase connects.Respectively low pressure stage and high pressure section, high pressure section connect high back pressure turbine condenser, low pressure stage by steam exhaust fairlead
Low back pressure turbine condenser is connected by steam exhaust fairlead.The controlled system of valve is opened on steam exhaust header, realizes one section of whole knot
Structure.Steam exhaust header is arranged control valve and carries out a variety of adjustment operational modes convenient for system.
The setting of steam exhaust recycling system increases steam turbine, high back pressure Steam Turbine Through IP Admission steam discharge connecting line to the work for increasing steam turbine
Make (power) steam inlet, steam exhaust header high pressure section connecting line increases the steam discharge connecting tube of steam turbine to the suction steam ports for increasing steam turbine
Lu Zhizeng steam turbine condensers vapour (shell) side；It is in parallel that several increasing steam turbines also can be used, for further carrying out steam increasing temperature and pressure
Or increase operational flexibility.
Alternatively, when not using steam exhaust header, low back pressure turbine steam exhaust fairlead is directly connected to the first steam exhaust condenser,
High back pressure exhaust steam in steam turbine fairlead is directly connected to the second steam exhaust condenser；High back pressure exhaust steam in steam turbine fairlead is also connected with steam exhaust
The suction steam ports of recycling system or low back pressure turbine steam exhaust fairlead also connect the suction of steam exhaust recycling system
Steam ports；The steam drain connection of steam exhaust recycling system increases steam turbine condenser；Joint water conservancy project system access heating network.
It is adjustable increasing steam turbine to increase steam turbine, can also be unadjustable increasing steam turbine.
Increase steam turbine power steam, can also be steam turbine high-pressure cylinder steam discharge, can also be boiler reheater cold end (or heat
End) steam extraction.
Joint water conservancy project system includes the first steam exhaust condenser, the second steam exhaust condenser, increases steam turbine condenser, heat supply network heating
Device, heat supply network water system, mating piping (including pipeline, valve, pipe fitting, suspension and support, expansion joint etc.).
Steam exhaust header low pressure stage connecting line is to first steam exhaust condenser vapour (shell) side, steam exhaust header high pressure section connecting line
To second steam exhaust condenser vapour (shell) side.High back pressure Steam Turbine Through IP Admission steam discharge and low back pressure turbine intermediate pressure cylinder steam discharge connect respectively
Road is taken over to heat exchangers for district heating.
The heat supply network circulating water line of heat supply network water system passes through the first steam exhaust condenser, the second steam exhaust condenser, increases vapour successively
Machine condenser, heat exchangers for district heating, heat supply network recirculated water supply water after heating to heat supply network.
The hot well of each condenser condensed water piping connection steam exhaust device, can also be with independent hot well.
After the steam exhaust of indirect air cooling unit is introduced to steam exhaust header, according to heated type condenser system configuring condition, and
Carbonated drink parameter match condition needs to handle the steam exhaust in steam exhaust header accordingly, further to utilize, recycling steam exhaust heat
Amount.
Multichannel process recycling is carried out to steam exhaust.
The roads A：Low parameter (10.5KPa) steam exhaust is directly entered the first steam exhaust condenser, for heating heat supply network return water.Heat supply network returns
Coolant-temperature gage is 25 DEG C.The steam exhaust of 10.5KPa can directly heat heat supply network return water.The heat supply network return water of 25 DEG C of heating makes its heating 12
DEG C, reach 37 DEG C.The steam exhaust pressure extracted need not be handled.
The roads B：The steam exhaust of 20KPa can be used as heat source, continue to heat 37 DEG C of the water that the first steam exhaust condenser comes out.Institute
With the steam exhaust of 20KPa is directly entered the second steam exhaust condenser, and the hot net water of 37 DEG C of heating makes it heat up 21 DEG C, reaches 58 DEG C.
The steam exhaust pressure extracted need not be handled.
The roads C：In order to further increase the heat utilization efficiency of steam exhaust, steam turbine (or other modes) can be increased by steam by steam exhaust
Pressure suitably increases, and vapor (steam) temperature is enhanced therewith, then removes heating heat supply network return water.Utilize high back pressure Steam Turbine Through IP Admission steam discharge
As steam turbine power steam is increased, suction steam exhaust header high pressure section 20KPa steam discharges (steam exhaust) increase steam turbine steam discharge 45KPa and enter increasing vapour
Machine condenser continues to heat heat supply network return water, so that it is heated up 20 DEG C, reach 78 DEG C as heat supply network return water third level heater.
So far, the steam exhaust in steam exhaust header, respectively with 10.5KPa, 20KPa, increase steam turbine boost to tri- kinds of parameters of 45KPa into
Enter different condenser heating heat supply network return water, heat supply network return water has been warming up to 78 DEG C by 25 DEG C.
78 DEG C of hot net water enters the heat exchangers for district heating positioned at initial station, carries out fourth stage heating.After level Four heats, heat
Net water reaches 120 DEG C, is sent to outside networks of heat supply.
Just end is trembled with fear the phase in winter, and 78 DEG C of hot water can be directly to resident's heat supply.For algid stage in winter, 78 DEG C of heat
Water enters back into heat exchangers for district heating, and 120 DEG C are heated to using extracted steam from turbine, is resident's heat supply.
This system work operation is as follows：
Two (1# and 2#) exhaust steam in steam turbine are drawn from blow-off line or condenser throat.
1# exhaust steam in steam turbine enters the first steam exhaust condenser, as primary heater, heats heat supply network return water, makes its heating
Certain temperature.2# exhaust steam in steam turbine enters weary second steam exhaust condenser, as second level heater, continues to heat heat supply network return water,
Make its certain temperature that heats up again.
Using 2# Steam Turbine Through IP Admissions steam discharge as steam turbine power steam is increased, the 2# turbine low pressure cylinders row extracted is aspirated
Vapour (steam exhaust) increases steam turbine steam discharge and enters increasing steam turbine condenser, as heat supply network return water third level heater, continues to heat heat supply network time
Water makes its certain temperature that heats up again.
When Heating Season is run, the heat exchangers for district heating positioned at initial station belongs to fourth stage heater.After level Four heats, heat supply network
Water has reached required temperature, is sent to outside networks of heat supply.
The operation of Multi-stage heating formula condenser system is as follows：
The water system of three condensers, mutual sequential series it is weary can to flow successively through first with series operation, i.e. heat supply network return water
Vapour condenser, increases steam turbine condenser at the second steam exhaust condenser, and water system water temperature is stepped up.
The water system of three condensers, is respectively provided with bypass conduit, can also bypass operation, i.e. heat supply network return water flows through first
After steam exhaust condenser, from the second steam exhaust condenser, increase steam turbine condenser bypass, flows directly into heat exchangers for district heating or heat supply network returns
Water is directly entered the second steam exhaust condenser without flow through the first steam exhaust condenser, from steam turbine condenser bypass is increased, then flows into heat supply network
Heater or heat supply network return water are directly entered increasing steam turbine condenser without flow through the first steam exhaust condenser, the second steam exhaust condenser
Afterwards, heat exchangers for district heating is flowed into.
If the overhaul of steam turbine of 10.5KPa back pressure operations, there is no the steam exhaust of 10.5KPa back pressures in steam exhaust header.That
, the first steam exhaust condenser is just split.Heat supply network return water can flow through the first steam exhaust condenser, but not be warmed.Heat supply network return water
The first steam exhaust condenser can also be bypassed.Heat supply network return water is heated up in the second steam exhaust condenser, increasing steam turbine condenser,
Heated up angle value will be varied from.This is a kind of variable parameter operation, and temperature notch is filled by heat exchangers for district heating, extracted steam from turbine
Amount can suitably increase.
If the overhaul of steam turbine of 20KPa back pressure operations, there is no the steam exhaust of 20KPa back pressures in steam exhaust header.There are two types of
System configuration and operational mode.
First operational mode, the second steam exhaust condenser increase steam turbine condenser and are split, and heat supply network return water is from the second steam exhaust condensing
Device, increasing steam turbine condenser flow through or bypass the second steam exhaust condenser, increase steam turbine condenser, and heat supply network return water heating system is by level Four
Become two level, i.e.,：First steam exhaust condenser, heat exchangers for district heating, the second steam exhaust condenser increase temperature caused by steam turbine condenser off-the-line
Degree shortcoming is compensated by heat exchangers for district heating, and extraction flow of steam suitably increases.
Second operational mode, the second steam exhaust condenser are split, and heat supply network return water is flowed through or bypassed from the second steam exhaust condenser
Fall the second steam exhaust condenser, heat supply network return water heating system becomes three-level from level Four, i.e.,：First steam exhaust condenser increases steam turbine condensing
Device, heat exchangers for district heating, temperature shortcoming caused by the second steam exhaust condenser off-the-line are compensated by heat exchangers for district heating, and extraction flow of steam is suitable
Work as increase；At this point, increase the power steam of steam turbine and aspirate the low back pressure turbine steam turbine that steam exhaust both is from operation, low back pressure steam
Turbine is adjusted to high back pressure operation.
If two steam turbines all overhaul, heat supply accordingly stops.
Finally it should be noted that：The foregoing is merely the explanations of the present invention, are not intended to restrict the invention, although to this hair
It is bright to be described in detail, it for those skilled in the art, still can be to aforementioned recorded technical solution
It modifies or equivalent replacement of some of the technical features.All within the spirits and principles of the present invention, made by
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. heating system, including two steam turbines and corresponding two condensers, steam exhaust extraction system, steam exhaust are recycled in a kind of thermal power plant's steam exhaust
Recycling system, joint water conservancy project system；Two steam turbines have different operation back pressures, respectively high back pressure steam turbine, low back pressure
Steam turbine；It is characterized in that：Using steam exhaust extraction system, trepanning extracts steam exhaust on two condensers respectively, passes through pipeline
It is transported to steam exhaust header；Joint water conservancy project system includes the first steam exhaust condenser, the second steam exhaust condenser, increases steam turbine condenser；It is weary
Vapour header divides the first steam exhaust of two-way piping connection condenser, the second steam exhaust condenser；Steam exhaust header is through steam exhaust recycling system
Piping connection increases steam turbine condenser；Joint water conservancy project system access heating network.
2. heating system is recycled in thermal power plant's steam exhaust according to claim 1, which is characterized in that joint water conservancy project system further includes
Heat exchangers for district heating, heat supply network water system；The heat supply network circulating water line of heat supply network water system passes through the first steam exhaust condenser, second weary successively
Vapour condenser increases steam turbine condenser, heat exchangers for district heating, and heat supply network recirculated water supplies water after heating to heat supply network.
3. heating system is recycled in thermal power plant's steam exhaust according to claim 1, which is characterized in that steam exhaust extraction system includes weary
Vapour draws special parts, pipeline and steam exhaust header are drawn in steam exhaust；Steam exhaust is drawn special parts and is fixedly installed on condenser throat side,
Steam exhaust, which is drawn, is arranged steam exhaust fairlead on throat's side plate that special parts are surrounded, be arranged on the inside of the condenser throat side of trepanning and add
Steam exhaust deflector is arranged in strong structure, steam exhaust fairlead inside；Steam exhaust draws special parts and draws piping connection steam exhaust connection by steam exhaust
Case；Steam exhaust fairlead is equipped with control valve.
4. heating system is recycled in thermal power plant's steam exhaust according to claim 1, which is characterized in that steam exhaust header is equipped with valve
Door forms two-stage structure；Respectively high pressure section and low pressure stage, high pressure section connect high back pressure turbine condenser, low pressure stage connection
Low back pressure turbine condenser；Valve is realized one section of overall structure by control open state.
5. heating system is recycled in thermal power plant's steam exhaust according to claim 2, which is characterized in that high back pressure Steam Turbine Through IP Admission
Steam discharge and low back pressure turbine intermediate pressure cylinder steam discharge are separately connected pipeline to heat exchangers for district heating.
6. heating system is recycled in thermal power plant's steam exhaust according to claim 1, which is characterized in that steam exhaust recycling system is set
Set increasing steam turbine, high back pressure Steam Turbine Through IP Admission steam discharge connecting line to the power steam entrance for increasing steam turbine, steam exhaust header high pressure section
For connecting line to the suction steam ports for increasing steam turbine, the steam discharge connecting line for increasing steam turbine extremely increases steam turbine condenser vapour side.
7. heating system is recycled in thermal power plant's steam exhaust according to claim 1, which is characterized in that the first steam exhaust condenser, the
Two steam exhaust condensers, the water system for increasing steam turbine condenser, mutual sequential series, series operation；It is first steam exhaust condenser, second weary
Vapour condenser, the water system for increasing steam turbine condenser, are respectively provided with bypass conduit, bypass and run for realizing off-the-line.
8. heating system, including two steam turbines and corresponding two condensers, steam exhaust extraction system, steam exhaust are recycled in a kind of thermal power plant's steam exhaust
Recycling system, joint water conservancy project system；Two steam turbines have different operation back pressures, respectively high back pressure steam turbine, low back pressure
Steam turbine；It is characterized in that：Using steam exhaust extraction system, steam exhaust is drawn in trepanning on two condensers respectively；Joint water conservancy project system
System includes the first steam exhaust condenser, the second steam exhaust condenser, increases steam turbine condenser；Low back pressure turbine steam exhaust fairlead directly connects
The first steam exhaust condenser is connect, high back pressure exhaust steam in steam turbine fairlead is directly connected to the second steam exhaust condenser；High back pressure steam turbine is weary
Vapour fairlead is also connected with the suction steam ports of steam exhaust recycling system or low back pressure turbine steam exhaust fairlead also connects steam exhaust
The suction steam ports of recycling system；The steam drain connection of steam exhaust recycling system increases steam turbine condenser；Joint water conservancy project system
Access heating network.
9. a kind of operation method of the steam exhaust of thermal power plant according to claim 1 recycling heating system, which is characterized in that thermal power plant
After the steam exhaust of Steam Turbine is introduced to steam exhaust header, matched according to heated type condenser system configuring condition and carbonated drink parameter
Situation carries out multichannel process to steam exhaust, recycles steam exhaust heat；
The roads A：Low parameter steam exhaust is directly entered the first steam exhaust condenser, for heating heat supply network return water；
The roads B：The steam exhaust of high parameter is directly entered the second steam exhaust condenser as heat source, continues the first steam exhaust condenser of heating and goes out
Carry out heat supply network return water；
The roads C：Using high back pressure Steam Turbine Through IP Admission steam discharge as steam turbine power steam is increased, the steam exhaust of high parameter is aspirated, increases steam turbine
Steam discharge enters increasing steam turbine condenser, continues the second steam exhaust condenser of heating and comes out heat supply network return water；
Just end is trembled with fear the phase in winter, and three-level heat hot water is provided to heat supply heat supply network；
Algid stage in winter, when Heating Season is run, high back pressure Steam Turbine Through IP Admission steam discharge and low back pressure turbine intermediate pressure cylinder steam discharge
Heat exchangers for district heating is respectively enterd, heating increases steam turbine condenser and comes out heat supply network return water；After level Four heats, hot net water has reached institute
Heating temperature is needed, outside networks of heat supply is sent to.
10. the operation method of thermal power plant's steam exhaust recycling heating system according to claim 9, which is characterized in that the first steam exhaust
Condenser, the second steam exhaust condenser, the water system for increasing steam turbine condenser, are respectively provided with bypass conduit, for bypassing operation；
If the overhaul of steam turbine of low back pressure operation, the first steam exhaust condenser is split, and heat supply network return water flows through the first steam exhaust condensing
Device bypasses the first steam exhaust condenser, and heat supply network return water heating system becomes three-level from level Four, i.e.,：Second steam exhaust condenser increases
Steam turbine condenser, heat exchangers for district heating；Temperature shortcoming caused by first steam exhaust condenser off-the-line is compensated by heat exchangers for district heating, steam turbine
Middle row's steam extraction amount suitably increases；
If the overhaul of steam turbine of high back pressure operation, has two kinds of system configurations and operational mode；
First operational mode, the second steam exhaust condenser, increase steam turbine condenser be split, heat supply network return water from the second steam exhaust condenser,
Increase steam turbine condenser to flow through or bypass the second steam exhaust condenser, increase steam turbine condenser, heat supply network return water heating system is become by level Four
For two level, i.e.,：First steam exhaust condenser, heat exchangers for district heating；Second steam exhaust condenser increases temperature caused by steam turbine condenser off-the-line
Shortcoming is compensated by heat exchangers for district heating, and extraction flow of steam suitably increases；
Second operational mode, the second steam exhaust condenser are split, and heat supply network return water flows through from the second steam exhaust condenser or bypass
Two steam exhaust condensers, heat supply network return water heating system become three-level from level Four, i.e.,：First steam exhaust condenser increases steam turbine condenser, heat
Net heater；Temperature shortcoming caused by second steam exhaust condenser off-the-line is compensated by heat exchangers for district heating, and extraction flow of steam suitably increases
Add；At this point, increase the power steam of steam turbine and aspirate the low back pressure turbine steam turbine that steam exhaust both is from operation, low back pressure turbine
Be adjusted to high back pressure operation.
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