CN206959102U - Cogeneration units depth peak regulation system is improved using electric boiler heat supply - Google Patents
Cogeneration units depth peak regulation system is improved using electric boiler heat supply Download PDFInfo
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- CN206959102U CN206959102U CN201621384412.0U CN201621384412U CN206959102U CN 206959102 U CN206959102 U CN 206959102U CN 201621384412 U CN201621384412 U CN 201621384412U CN 206959102 U CN206959102 U CN 206959102U
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- heat supply
- peak regulation
- electric boiler
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Abstract
The utility model is related to it is a kind of improve cogeneration units depth peak regulation system using electric boiler heat supply, because online load is strictly limited during cogeneration of heat and power enterprise peak regulation, carried out with peak regulation, the unit heat supply load that draws gas also declines therewith.A part of station service of electricity power enterprise itself, complementary heating load are absorbed using electric boiler, Ye Shi cogenerations of heat and power enterprise participates in peak regulation and is possibly realized.When peak regulation is needed, the rate of load condensate of generator is reduced first, now, occur and supply heat supply shortage of heat, then insufficient section is supplemented by electric boiler, and benefit angle is subsidized from peak regulation of power plant, as stated above, if also there is electric boiler ability residue, then the rate of load condensate of generator should further be turned down, untill electric boiler is all used.
Description
Technical field
It the utility model is related to one kind and improve cogeneration units depth peak regulation system using electric boiler heat supply.
Background technology
Fig. 1 is certain factory 200MW thermal power plant unit working condition charts, and in the case where heating load is certain, (the heating amount of drawing gas is in figure
350t/h), its peak regulation upper limit is the electric load (load corresponding to Figure 1A points) corresponding to the maximum continuous throttle flow of unit；Under peak regulation
It is limited under the amount of drawing gas and the electric load (Figure 1B points corresponding load) corresponding to the intersection point of low pressure (LP) cylinder minimum displacement restraining line.
The peak regulation scope of region corresponding to the AB of section, as cogeneration units under certain thermic load.It is obvious that cogeneration of heat and power machine
During group heat supply running, its peak modulation capacity is very limited amount of when being run compared to pure condensate.As it was previously stated, when cogeneration units run to
During low pressure (LP) cylinder minimum displacement restraining line, unit can not continue peak regulation.
In view of it is above-mentioned the defects of, the design people is actively subject to research and innovation, and a kind of electric boiler heat supply is utilized to found
Cogeneration units depth peak regulation system is improved, makes it with more the value in industry.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is to provide one kind improves thermoelectricity connection using electric boiler heat supply
Produce unit depth peak regulation system.
The utility model improves cogeneration units depth peak regulation system using electric boiler heat supply, including：Steam turbine generator
Group is connected and the electric boiler that unit electric energy is converted into heat energy is parallel with the circuit of electric custom system, and Turbo-generator Set is used with heat
Heat supply pipeline is provided between the system of family, the heat energy output end of electric boiler connects the heat supply pipeline.
Further, boiler, gas outlet connection high pressure cylinder, intermediate pressure cylinder, the low pressure (LP) cylinder of boiler, the exhaust steam end connection of high pressure cylinder
The reheater of boiler, steam are exported after the reheater of boiler to intermediate pressure cylinder, intermediate pressure cylinder connection low pressure (LP) cylinder, low pressure (LP) cylinder connection condensing
Device；
Hp by-pass system is provided between the steam inlet pipe and gland steam exhauster of high pressure cylinder, hp by-pass system connects from major steam line
Go out, depressurized through high pressure bypass valve, desuperheat is followed by cold section of pipeline of reheating；Intermediate pressure cylinder air inlet pipe connects low-pressure bypass system, low pressure (LP) cylinder
It is followed by through the decompression of low voltage bypass valve, desuperheat to condenser；
Before the other control valve of height of high pressure cylinder and the pipeline that draws gas is connect, control valve group is provided with the pipeline that draws gas and desuperheat subtracts
Pressure device, the pipeline that draws gas are communicated to heat supply network.
Further, main steam, cold pipeline enclosure again have been installed in parallel reducing-and-cooling plant and pipeline.
By such scheme, the utility model at least has advantages below：
Directly using electric boiler digestion generator load, its theoretical peak regulation maximum is the total electric work of institute's configuration electric boiler
Rate.This mode absorbs generator outlet load to reduce final electricity volume using electric boiler, due to electric boiler control is simple,
Response is fast, can be needed with real-time response peak load regulation network.Exchanged heat with electricity, born to caused extraction for heat supply during compensating peak regulation in short-term
Lotus reduces, and equally reaches the purpose of unit depth peak regulation.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model
Art means, and being practiced according to the content of specification, with preferred embodiment of the present utility model and coordinate accompanying drawing detailed below
Describe in detail bright as after.
Brief description of the drawings
Fig. 1 is certain factory 200MW cogeneration units working condition charts；
Fig. 2 is the utility model electric boiler peak regulation method schematic diagram；
Fig. 3 is system schematic after the transformation of the utility model cogeneration units high pressure turbine by；
Fig. 4 is system schematic after the transformation of the utility model cogeneration units low voltage bypass.
Embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not limited to the scope of the utility model.
The utility model improves cogeneration units depth peak regulation system using electric boiler heat supply, including：Steam turbine generator
Group is connected and the electric boiler that unit electric energy is converted into heat energy is parallel with the circuit of electric custom system, and Turbo-generator Set is used with heat
Heat supply pipeline is provided between the system of family, the heat energy output end of electric boiler connects the heat supply pipeline.
When peak regulation is needed, the rate of load condensate of generator is reduced first, now, it may appear that for heat supply shortage of heat,
Then insufficient section is supplemented by electric boiler, and benefit angle is subsidized from peak regulation of power plant, if there is electric boiler ability residue, then should
The rate of load condensate of generator is further turned down, untill electric boiler is all used.
Referring to Fig. 2 and Fig. 4, one kind described in the preferred embodiment of the utility model one improves thermoelectricity connection using electric boiler heat supply
Produce unit depth peak regulation system.
Because online load is strictly limited during cogeneration of heat and power enterprise peak regulation, carried out with peak regulation, unit heat supply is drawn gas negative
Lotus also declines therewith.A part of station service of electricity power enterprise itself is absorbed using electric boiler, complementary heating load, also makes cogeneration of heat and power
Enterprise participates in peak regulation and is possibly realized.
When peak regulation is needed, the rate of load condensate of generator is reduced first, now, it may appear that for heat supply shortage of heat,
Then insufficient section is supplemented by electric boiler, subsidizes benefit angle from peak regulation of power plant, as stated above, electric boiler ability also occurs
If residue, then the rate of load condensate of generator should further be turned down, untill electric boiler is all used.
Analysis of Peak Regulation Capability：Such a mode directly digests generator load using electric boiler, and its theoretical peak regulation maximum is
To be configured electric boiler gross electric capacity.
This mode absorbs generator outlet load to reduce final electricity volume using electric boiler, because electric boiler controls
Simply, response is fast, can be needed with real-time response peak load regulation network.Exchanged heat with electricity, drawn gas to caused during compensating peak regulation in short-term
Heating demand reduces, and equally reaches the purpose of unit depth peak regulation.
High pressure turbine by heat supply is transformed
Hp by-pass system picks out from major steam line, is depressurized through high pressure bypass valve, desuperheat is followed by cold section of pipeline of reheating.
The draw gas compensation of pipeline of increase band is drawn gas pipeline before former unit high other control valve, and set up suitable control valve group and
Reducing-and-cooling plant, regulation steam parameter meet that heat exchangers for district heating enters vapour requirement, are connected to heat supply network.
During peak load regulation, peak regulation power is down to original heat supply extraction flow and corresponds to low pressure (LP) cylinder minimum extraction flow operating point
When, open high pressure turbine by and compensate the valve group compensation heat supply network load that draws gas, while reduce the former heat supply amount of drawing gas further to reduce electric work
Rate.
Improved influence
(1) boiler operatiopn is influenceed
This scheme changes original steam/water circulating, and steam is directly led out for heat supply network after should entering high pressure cylinder acting originally
Heating, reduces into reheater quantity of steam, and reheater temperature will be caused to raise, and need to consider to protect reheater cooling measure.It is high
Scope between the calculating tube wall temperature of warm reheater and power plant's observed temperature, and safe handling limiting temperature, it should be used as mending by height
Repay the Primary Reference for the amount of drawing gas.
Some pure condensate units have such as carried out extraction for heat supply transformation or reheater actual measurement temperature by height to improve economy in recent years
Degree should then select other schemes close to limiting temperature and without effective temperature-reducing measure.
(2) steam turbine operation is influenceed
This programme use bypass draw gas from high pressure turbine by control valve front end, vapour source be located at steam turbine main inlet throttle-stop valve it
Before, direct functional impact will not be produced to shaft system of unit and each grading vapour of steam turbine, not interfere with unit original and design work of drawing gas
Condition and heat network system are safe for operation.
Newly-increased valve group does not influence original bypath system predominating path and size, does not change original high pressure turbine by function and protection
Characteristic.Because such a operating mode by-pass line participates in unit operation regulation, necessary preheating pipeline should be increased, when avoiding steam and passing through
Thermal shock is produced to system pipeline.
Low voltage bypass heat supply is transformed
Low-pressure bypass system steam by-pass steam turbine mesolow cylinder is depressurized through low voltage bypass valve, desuperheat is followed by condenser.
The reforming content of low voltage bypass
After the low other control valve of former unit and spray desuperheating section, steam fluidised form stable section increase is drawn gas pipeline, and former low
Other to increase control valve to condenser porch, using former low pressure bypass pressure and temperature reducing device, regulation steam parameter meets heat exchangers for district heating
Enter vapour requirement, be connected to heat supply network.
After low voltage bypass implements heat supply transformation, low voltage bypass direct heating can be taken in the method for operation, by high-low pressure
Road combined heat-supplying mode, two kinds of methods of operation are illustrated below.
Only low voltage bypass operation heat supply
(1) peak load regulation capability analysis after transforming
During peak load regulation, peak regulation power is down to original heat supply extraction flow and corresponds to low pressure (LP) cylinder minimum extraction flow operating point
When, close and increase low side newly to condenser inlet control valve, open low other control valve and attemperator and compensation is drawn gas valve group compensation heat
Net load, the former heat supply amount of drawing gas is reduced further to reduce electrical power.
Improved influence
A) boiler operatiopn is influenceed
Low other modification scheme draws gas to be exported quoted from reheater, directly will not produce functionally to boiler, environmental protection facility
Ring.
B) steam turbine operation is influenceed
This scheme changes former unit thermodynamic cycle, and in should entering originally, low pressure (LP) cylinder acting steam directly lead out and be used for
Heat supply network is heated, and reduces in entrance, low pressure (LP) cylinder quantity of steam, and each grading vapour of steam turbine will be caused to change, should re-start and axially push away
Power accounting, the through-flow sound strength of parts at different levels of mesolow after new accounting are no more than design load, swollen difference and axial displacement change after drawing gas
Change is no more than design load.Drawn gas load on increasing the maximum drawn gas of low voltage bypass compensation newly, specific unit need to be directed to and made a concrete analysis of
After provide.
Low side valve group is increased newly due to adding bypass to condenser inlet control valve, is considered as chain with former bypass control valve
Logic, it can be opened simultaneously using during bypass functionality.
Some pure condensate units to mesolow cross over pipe or high pressure cylinder exhaust transform in recent years is used for heat supply, Huo Zheyi
Hot arc again cold to unit is drawn gas utilization, so that unit items limit value close to limit value, is considered as other schemes.
Hp and lp bypass cooperation heat supply
(1) peak load regulation capability analysis after transforming
Hp and lp bypass combined heat refers to the steam by high pressure turbine by, is entered after reheated device heating by low voltage bypass
Row heat supply.Therefore, its peak modulation capacity of height bypass combined heat mode, heat capacity and high pressure turbine by extraction for heat supply scheme one
Cause, i.e., for 200MW cogeneration units, there are 60t/h initial steams by the external heat supply of hp and lp bypass, electrical power can be reduced
15.36MW, increase heat supply 20.25MW.
(2) improved influence
A) boiler operatiopn is influenceed
High other steam discharge flows through reheater through pressure and temperature reducing, it should be noted that monitoring regulation boiler reheater temperature during opening bypass
To normal range (NR).
B) steam turbine operation is influenceed
Unit is run by this scheme, will not be to unit when the quantity of steam by through height and the quantity of steam on low side match
Shafting and each grading vapour of steam turbine produce direct functional impact.But how to control hp and lp bypass steam flow to match, be machine
The key run after group transformation.
The high other part of this scheme is fully utilized original bypass, the increased valve group of drawing gas in low other part, the problem of should be noted with
Low voltage bypass extraction for heat supply scheme is identical.
Bypath system increase-volume heat supply is transformed
Reforming content
Hp by-pass system is transformed：High side valve is changed, increases high side valve capacity；The high forward and backward piping foundation of side valve, increase are high
The caliber of side valve bore and high side valve inlet and outlet pipeline.Also reducing-and-cooling plant can be installed in parallel in main steam, cold pipeline enclosure again
And pipeline, increase high other capacity.
Low-pressure bypass system is transformed：Low side valve is changed, increases low side valve capacity；The low forward and backward piping foundation of side valve, increase are low
The caliber of side valve bore and low side valve inlet and outlet pipeline；Increase twice butterfly valve after low side valve, increase low side to heat supply network unicom pipeline.
Also it can be united with low collateral line and be installed in parallel reducing-and-cooling plant and pipeline, carry out heat supply.
Two unit heat network system transformations：Connect two machine heat exchangers for district heating steam inlet pipe roads, heat plus drain water piping, adaline
The increase of boiler direct heating ability after the group system reform.
Oxygen-eliminating device, the steam feed pump vapour source system reform：Adjust it is cold again to auxiliary vapour header through-current capacity, meet oxygen-eliminating device and
Steam feed pump steam consumption demand；Adjust auxiliary vapour to oxygen-eliminating device and enter vapour adjustment door through-current capacity, ensure that oxygen-eliminating device can press in design
Power steam consumption.
It is other：Corresponding transformation part suspension and support and measuring point；High and low pressure bypath system is protected and carries out logic optimization, makes machine
Group bypath system can adapt to bypass the requirement of heat supply.
The main principle of transformation
Original bypath system predominating path is constant, only carries out local capacity-increasing transformation；The original work(of bypath system can neither be changed
Can, unit original heating steam supply way and ability can not be had influence on again；
Enter the steam inlet condition of heat exchangers for district heating through bypath system, the design requirement of existing heat exchangers for district heating should be met；
The through-current capability of high and low pressure bypath system, stop high processing condition design parameter by unit and checked；
Just add after transformation and do not come into operation, only come into operation oxygen-eliminating device, and vapour source is used as by the use of cold section of steam of reheating；Steam feed pump
Vapour source also by the offer of cold section of reheating.
Boiler, heat network system, environmental protection facility after transformation, should be able to safety and stability continuously run.
Peak load regulation capability analysis after transformation
Unit only keeps boiler operatiopn, and the thermic load of 180%~200% heat capacity can be provided through bypath system, for
200MW units electric load can reduce 140MW, and 220MW can be reduced for 300MW units electric load.
Boiler and heat network system after transformation, can safety and stability continuously run, environmental protection facility normally comes into operation, stably reaching standard row
Put.
Influenceed after transformation
Boiler, steam turbine operation are influenceed
Because the method for operation is different from unit starting mode, when bypath system is run under heat supply mode, Ying Xie after transformation
Except the protection of the low interlocking close low pressure bypass valve arrangement of condenser vacuum；For effective guarantee security of system, protective system in heat power is being designed
Middle increase heat exchangers for district heating tripping operation interlock system valve and boiler main fuel trip virtual protection return circuit, can further increase heat supply network and add
Hot device and security of system.
Environmental protection facility is influenceed
After bypath system capacity-increasing transformation, boiler load is close to the thermic load of even up to boiler BRL operating modes, and unit is although give
Coolant-temperature gage is relatively low, and denitration can also be put into.Therefore, environmental protection facility being capable of normal operation.
Described above is only preferred embodiment of the present utility model, is not limited to the utility model, it is noted that
For those skilled in the art, on the premise of the utility model technical principle is not departed from, can also do
Go out some improvement and modification, these improvement and modification also should be regarded as the scope of protection of the utility model.
Claims (3)
1. one kind improves cogeneration units depth peak regulation system using electric boiler heat supply, it is characterised in that including：Turbine generator
Unit connects and the electric boiler that unit electric energy is converted into heat energy is parallel with the circuit of electric custom system, Turbo-generator Set and heat
Heat supply pipeline is provided between custom system, the heat energy output end of electric boiler connects the heat supply pipeline.
2. according to claim 1 improve cogeneration units depth peak regulation system using electric boiler heat supply, its feature exists
In, boiler, gas outlet connection high pressure cylinder, intermediate pressure cylinder, the low pressure (LP) cylinder of boiler, the reheater of the exhaust steam end connection boiler of high pressure cylinder,
Steam is exported after the reheater of boiler to intermediate pressure cylinder, intermediate pressure cylinder connection low pressure (LP) cylinder, low pressure (LP) cylinder connection condenser；
Hp by-pass system is provided between the steam inlet pipe and gland steam exhauster of high pressure cylinder, hp by-pass system picks out from major steam line,
Depressurized through high pressure bypass valve, desuperheat is followed by cold section of pipeline of reheating；Intermediate pressure cylinder air inlet pipe connects low-pressure bypass system, and low pressure (LP) cylinder is through low
The decompression of pressure bypass valve, desuperheat are followed by condenser；
Before the other control valve of height of high pressure cylinder and the pipeline that draws gas is connect, control valve group and pressure and temperature reducing dress are provided with the pipeline that draws gas
Put, the pipeline that draws gas is communicated to heat supply network.
3. according to claim 2 improve cogeneration units depth peak regulation system using electric boiler heat supply, its feature exists
In main steam, cold pipeline enclosure again have been installed in parallel reducing-and-cooling plant and pipeline.
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| CN201621384412.0U CN206959102U (en) | 2016-12-16 | 2016-12-16 | Cogeneration units depth peak regulation system is improved using electric boiler heat supply |
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| CN201621384412.0U CN206959102U (en) | 2016-12-16 | 2016-12-16 | Cogeneration units depth peak regulation system is improved using electric boiler heat supply |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504543A (en) * | 2016-12-16 | 2017-12-22 | 大唐东北电力试验研究所有限公司 | Cogeneration units depth peak regulation system and method are improved using electric boiler heat supply |
| CN108443957A (en) * | 2018-02-26 | 2018-08-24 | 南京友智科技有限公司 | The peak regulation heat supply method that a kind of big thermoelecrtic, hold over system jointly control |
| CN108825316A (en) * | 2018-08-29 | 2018-11-16 | 山西格盟安全生产咨询有限公司 | A kind of steam extraction heat supply unit quick response load system |
| CN109113813A (en) * | 2018-10-23 | 2019-01-01 | 赫普科技发展（北京）有限公司 | A kind of heat accumulating power generating system |
| CN110247410A (en) * | 2019-06-11 | 2019-09-17 | 中国神华能源股份有限公司 | A kind of peak regulation processing method of thermal power plant unit, apparatus and system |
-
2016
- 2016-12-16 CN CN201621384412.0U patent/CN206959102U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504543A (en) * | 2016-12-16 | 2017-12-22 | 大唐东北电力试验研究所有限公司 | Cogeneration units depth peak regulation system and method are improved using electric boiler heat supply |
| CN107504543B (en) * | 2016-12-16 | 2023-07-11 | 大唐东北电力试验研究所有限公司 | Method for improving deep peak regulation of cogeneration unit by utilizing electric boiler heat supply |
| CN108443957A (en) * | 2018-02-26 | 2018-08-24 | 南京友智科技有限公司 | The peak regulation heat supply method that a kind of big thermoelecrtic, hold over system jointly control |
| CN108825316A (en) * | 2018-08-29 | 2018-11-16 | 山西格盟安全生产咨询有限公司 | A kind of steam extraction heat supply unit quick response load system |
| CN109113813A (en) * | 2018-10-23 | 2019-01-01 | 赫普科技发展（北京）有限公司 | A kind of heat accumulating power generating system |
| CN109113813B (en) * | 2018-10-23 | 2024-01-02 | 赫普能源环境科技股份有限公司 | Heat accumulation power generation system |
| CN110247410A (en) * | 2019-06-11 | 2019-09-17 | 中国神华能源股份有限公司 | A kind of peak regulation processing method of thermal power plant unit, apparatus and system |
| CN110247410B (en) * | 2019-06-11 | 2021-05-28 | 中国神华能源股份有限公司 | Peak regulation processing method, device and system for heat supply unit |
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Address after: No. 3195, Jilin high tech Zone Wei Shan Road, Changchun, Jilin Patentee after: Datang northeast electric power test and Research Institute Co., Ltd. Address before: No. 3195, Jilin high tech Zone Wei Shan Road, Changchun, Jilin Patentee before: DATANG NORTHEAST ELECTRIC POWER TEST RESEARCH INSTITUTE CO., LTD. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20180202 Termination date: 20191216 |