CN208982123U - A kind of system for realizing three kinds of state switchover operations of thermoelectricity unit - Google Patents
A kind of system for realizing three kinds of state switchover operations of thermoelectricity unit Download PDFInfo
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- CN208982123U CN208982123U CN201820567848.6U CN201820567848U CN208982123U CN 208982123 U CN208982123 U CN 208982123U CN 201820567848 U CN201820567848 U CN 201820567848U CN 208982123 U CN208982123 U CN 208982123U
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Abstract
The utility model relates to a kind of systems for realizing three kinds of state switchover operations of thermoelectricity unit, it include: including high pressure turbine by spray desuperheating relief line, low voltage bypass spray desuperheating relief line and heat exchangers for district heating, the high pressure turbine by spray desuperheating relief line is located between boiler and high pressure cylinder, the high pressure turbine by spray desuperheating relief line, low voltage bypass spray desuperheating relief line include spray desuperheating pressure reducer, and the heat exchangers for district heating is connected with the pipeline after spray desuperheating pressure reducer；The steam that boiler generates is sent to heat exchangers for district heating by high pressure turbine by spray desuperheating relief line, low voltage bypass spray desuperheating relief line；The heat exchangers for district heating is connected with external heating system.The utility model utilizes existing or newly-increased hp and lp bypass spray desuperheating depressurized system, and retrofit work amount is small, can be realized thermoelectricity unit and is switched to three kinds of operating statuses completely, accomplishes maximum depth peak regulation.
Description
Technical field
The utility model relates to unit bypass applications fields, more particularly to realize thermoelectricity unit using firsts and seconds bypass
Be switched to the application field of three kinds of states switching boiler, and in particular to it is a kind of realize three kinds of state switchover operations of thermoelectricity unit be
System.
Background technique
It is known that electric energy cannot be stored, therefore user needs how many electricity, and power plant just needs synchronous sending more
Few electricity, just not will cause the waste of the energy in this way.But usually power plant each in the power system demand electric load be
It is constantly changed, in order to maintain active power balance, keep system frequency to stablize, it is necessary to which the department that generates electricity accordingly changes hair
For the generated energy of motor to adapt to the variation of power load, this is just called peak regulation.
It is rich in Chinese three northern areas of China electricity market capacity, combustion engine, water-storage etc. can peaking power source it is rare, peak load regulation network
Particularly thorny between fired power generating unit flexibility, power grid dissolves the scarce capacity of the new energy such as wind-powered electricity generation, photoelectricity, water power and nuclear power,
Abandonment, abandoning light, abandoning water and abandoning nuclear phenomenon are serious.
Cogeneration units " electricity determining by heat " mode is run in the prior art, and winter causes thermal power plant unit due to coupled thermomechanics
Peak modulation capacity is only 10% or so.With greatly developing for domestic renewable energy power, the wind-powered electricity generation photovoltaic of northeast and northwest is filled
Machine amount is increasing, and thermal power plant unit peak regulation caused by the coupled thermomechanics in winter is difficult, has had resulted in domestic Jilin in 2015, new
Boundary and Gansu abandonment rate are respectively up to 43%, 45% and 47%.
Summary of the invention
In view of this, the purpose of this utility model is to provide it is a kind of realize three kinds of state switchover operations of thermoelectricity unit be
System combines heat supply or hold over system using the decompression bypass of two-stage spray desuperheating, it is single for hot pot to realize that cogeneration units are switched to
The thermoelectricity decoupling of thermoelectricity unit may be implemented within certain period, can not only guarantee to be related to the heat supply of the people's livelihood for furnace operational mode
The heat of heat source supplies, and the depth peak regulation of thermal power plant may be implemented.
In order to realize these purposes, adopt the following technical scheme that
A kind of system for realizing three kinds of state switchover operations of thermoelectricity unit comprising boiler, the boiler connect high pressure cylinder,
Reheater is equipped in boiler, the high pressure cylinder is connected with reheater, and the reheater in the boiler connects intermediate pressure cylinder, medium pressure
Cylinder connects low pressure (LP) cylinder, and it further includes high pressure turbine by spray desuperheating relief line, low voltage bypass spray desuperheating that low pressure (LP) cylinder, which connects generator,
Relief line and heat exchangers for district heating, the high pressure turbine by spray desuperheating relief line is located between boiler and high pressure cylinder, described
High pressure turbine by spray desuperheating relief line or low voltage bypass spray desuperheating relief line include spray desuperheating pressure reducer, the heat supply network
Heater is connected with the pipeline after spray desuperheating pressure reducer；The heat exchangers for district heating is connected with external heating system；First shape
It is cogeneration of heat and power state under state, i.e., the steam that boiler generates passes through high pressure cylinder, reheater, intermediate pressure cylinder, low pressure (LP) cylinder and generator；
It is single Heating State under second state, the steam that boiler generates passes through high pressure turbine by spray desuperheating relief line, reheater, heat supply network
Heater, outer heating system, without high pressure cylinder, intermediate pressure cylinder；It is underload generating state, the steaming that boiler generates under the third state
Vapour a part is by high pressure turbine by spray desuperheating relief line, reheater, low voltage bypass spray desuperheating relief line, heat supply network heating
Device, outer heating system；Another part passes through high pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder, carries out unit underload generator operation.
High pressure turbine by spray desuperheating relief line and low voltage bypass spray desuperheating relief line whole steam send to heat supply network and add
Hot device heat exchange, may be implemented thermoelectricity power generator turbine completely not into steam, so that this cogeneration units is switched completely to as list
The external heat supply of heating boiler operational mode.So that steam power plant obtains the depth peak regulation and minimum load of least cost in winter
The method of operation provides valuable online space for renewable energy power generations such as wind-powered electricity generation photovoltaics in regional power grid.
Further, the high pressure turbine by spray desuperheating relief line can utilize the hp by-pass system of existing unit,
One end connects main steam line, and other end connects cold section of reheater of boiler, the high pressure turbine by spray desuperheating relief line
Including high pressure turbine by spray desuperheating pressure reducer, the inlet of the high pressure turbine by spray desuperheating pressure reducer is connected with pressure reducing valve.
The hp by-pass system of existing unit refers to that in this field, the burst thing such as accident or tripping occurs when starting for steam turbine
Part further prevents the generation of contingency equipped with hp by-pass system for conveying superheated steam.
In one embodiment, the high pressure turbine by spray desuperheating relief line can also be in parallel with existing high pressure turbine by
It is newly-increased be parallel with big-flow high-pressure bypass spray desuperheating relief line；The big-flow high-pressure bypasses spray desuperheating relief line
Including big flow spray desuperheating pressure reducer, the inlet of the big flow spray desuperheating pressure reducer is connected with high pressure entry shut-off valve
With the first pressure reducing valve；The high pressure entry shut-off valve is connected with boiler, the outlet connection of the big flow spray desuperheating pressure reducer
Cold section of reheater.
Defining for existing high pressure turbine by is identical as the hp by-pass system of existing unit, and described increase newly is parallel with big flow height
Pressure bypass spray desuperheating relief line is to be different from existing high pressure turbine by, corresponding with existing high pressure turbine by, is defined as increasing newly.
In one embodiment, the low voltage bypass spray desuperheating relief line can utilize the low voltage bypass of existing unit
System, one end connect leading point, after entrance bypasses and adjusts pressure loading valve and low pressure spray desuperheating pressure reducer, separate two branch
Pipeline arrives heat exchangers for district heating to condenser by shut-off valve all the way all the way.
In one embodiment, the low voltage bypass spray desuperheating relief line can also be in parallel with existing low voltage bypass
Newly-increased big flow low voltage bypass spray desuperheating relief line comprising big flow low voltage bypass spray desuperheating decompression and its entrance
Pressure reducing valve is adjusted, heat exchangers for district heating is then attached to.
In one embodiment, intermediate contact is set between the high pressure turbine by and low voltage bypass spray desuperheating relief line
Piping connection high pressure turbine by spray desuperheating relief line and low voltage bypass spray desuperheating relief line, and on intermediate liaison tube road
The shutdown shut-off valve of setting；The series operation bypassed by two-stage can pass through high pressure cylinder, reheater into vapour sequence with holding part
With intermediate pressure cylinder and low pressure (LP) cylinder so that unit operates under underload generated energy state.
Further, entrance bypass adjust pressure loading valve and low pressure spray desuperheating pressure reducer using integral type or adopt
With split type；The high pressure turbine by spray desuperheating pressure reducer and pressure reducing valve using integral type or using split type.
Further, entrance bypass adjust pressure loading valve and low pressure spray desuperheating pressure reducer using integral type or adopt
With split type.
Preferably, the high pressure turbine by spray desuperheating relief line capacity configuration is the 5% of the specified main steam flow of boiler
To 100%；The low voltage bypass spray desuperheating relief line capacity configuration is 5% to the 100% of the specified main steam flow of boiler.
Compared with the existing technology, the advantageous effects of the utility model:
The utility model has the advantage that
1. utilizing existing high pressure turbine by spray desuperheating depressurized system, retrofit work amount is small.
2. thermoelectricity unit may be implemented is switched to heating boiler completely, accomplish complete thermoelectricity decoupling.
3. thermoelectricity unit may be implemented is switched to heating boiler completely, accomplish maximum depth peak regulation, i.e. the unit
Generated energy be zero.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram of the utility model embodiment 1.
Fig. 2 is the schematic diagram of the utility model embodiment 2.
Fig. 3 is the schematic diagram of the utility model embodiment 3.
Fig. 4 is the schematic diagram of the utility model embodiment 4.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the utility model.On the contrary, they be only with such as
The example of the consistent device and method of some aspects be described in detail in the appended claims, the utility model.
It is only to be not intended to be limiting this reality merely for for the purpose of describing particular embodiments in the term that the utility model uses
With novel.In the "an" of the utility model and singular used in the attached claims, " described " and "the"
Most forms are intended to include, unless the context clearly indicates other meaning.It is also understood that term used herein " and/
Or " refer to and include that one or more associated any or all of project listed may combine.
It will be appreciated that though various information may be described using term first, second, third, etc. in the utility model,
But these information should not necessarily be limited by these terms.These terms are only used to for same type of information being distinguished from each other out.For example, not
In the case where being detached from the scope of the utility model, the first information can also be referred to as the second information, and similarly, the second information can also be with
The referred to as first information.Depending on context, word as used in this " if " can be construed to " ... when " or
" when ... " or " in response to determination ".
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of preferred embodiments of the present invention includes other realization, wherein can not be by shown or discussion
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, Lai Zhihang function, this should be by this
The embodiment person of ordinary skill in the field of utility model is understood.
The utility model will be described in detail by embodiment below.
Referring to Fig.1-3,
A kind of system for realizing three kinds of state switchover operations of thermoelectricity unit comprising boiler 6, the boiler 6 connect high pressure
Cylinder 20, boiler 6 is interior to be equipped with reheater 21, and the high pressure cylinder 20 is connected with reheater 21, and the reheater 21 in the boiler 6 connects
Intermediate pressure cylinder 10, medium pressure cylinder 10 connect low pressure (LP) cylinder 11, and it further includes high pressure turbine by spray desuperheating that low pressure (LP) cylinder 6, which connects generator 12,
Relief line, low voltage bypass spray desuperheating relief line and heat exchangers for district heating 15, the high pressure turbine by spray desuperheating relief pipe
Road is located between boiler 6 and high pressure cylinder 20, the high pressure turbine by spray desuperheating relief line and the decompression of low voltage bypass spray desuperheating
Pipeline includes spray desuperheating pressure reducer, and the heat exchangers for district heating is connected with the pipeline after spray desuperheating pressure reducer；The heat supply network adds
Hot device is connected with external heating system；Under first state, the steam that boiler generates passes through high pressure cylinder 20, reheater 21, middle pressure
Cylinder 10, low pressure (LP) cylinder 11 and generator 12；Under second state, the steam that boiler generates passes through high pressure turbine by spray desuperheating relief pipe
Road, reheater 21, low voltage bypass spray desuperheating relief line, heat exchangers for district heating, outer heating system, without high pressure cylinder 20, in
Cylinder pressure 10 and low pressure (LP) cylinder 11.
The utility model further includes bypass in power plant's centralized control system for thermal control module, and the bypass is for thermal control module
Be those skilled in the art rule of thumb or the limited trials prior art that can know or derive.
Embodiment 1
Referring to Fig.1, a kind of system for realizing three kinds of state switchover operations of thermoelectricity unit, including high pressure turbine by spray desuperheating subtract
Bypass in pressure pipe road, low voltage bypass spray desuperheating relief line, heat exchangers for district heating and power plant's centralized control system for thermal control module,
Whole steam are sent to heat exchangers for district heating and are exchanged heat by high pressure and the decompression bypass of low pressure spray desuperheating, thermoelectricity unit vapour may be implemented
Turbine is not completely into steam, so that this cogeneration units is switched completely to as single external heat supply of heating boiler operational mode.
Specifically, boiler 6 connects high pressure cylinder 20, it is equipped with reheater 21 in boiler 6, the high pressure cylinder 20 is connected with reheating
Device 21 is equipped with high pressure turbine by spray desuperheating relief line, the high pressure turbine by spray desuperheating between the boiler 6 and high pressure cylinder 20
Relief line is connected with reheater 21, and the high pressure turbine by spray desuperheating relief line is depressurized equipped with high pressure turbine by spray desuperheating
Device 9, the reheater 21 in the boiler 6 connect intermediate pressure cylinder 10, and medium pressure cylinder 10 connects low pressure (LP) cylinder 11, the connection hair of low pressure (LP) cylinder 6
Motor 12,20 entrance of high pressure cylinder are provided with high pressure entry shutoff valve 4, and 10 entrance of intermediate pressure cylinder is provided with middle indentation mouth cut-off
Valve 5.The low pressure (LP) cylinder 6 is connected to condenser 17.The inlet of the high pressure turbine by spray desuperheating pressure reducer 9 is connected with decompression
Valve 1.
Heat exchangers for district heating 15 and low voltage bypass spray desuperheating relief line are equipped between reheater 21 and intermediate pressure cylinder 10, it is described
It is in parallel between heat exchangers for district heating 15, low voltage bypass spray desuperheating relief line and intermediate pressure cylinder 10, the heat exchangers for district heating 15 and low
Pressure bypass spray desuperheating relief line is connected to condenser 17.
The heat exchangers for district heating 15 is in series with big flow low voltage bypass spray desuperheating relief line 14, the low voltage bypass spray
Water pressure and temperature reducing pipeline includes low pressure spray desuperheating pressure reducer 16.
The heat by heat exchangers for district heating 15 is sent into heat supply network heat supply or accumulation of heat water pot accumulation of heat.
Specifically, connecting leading point 13 between reheater 21 and intermediate pressure cylinder 10, the leading point 13 is cut by heating network entry
Only valve 2 connects big flow low voltage bypass spray desuperheating relief line 14 and heat exchangers for district heating 15；The leading point 13 also pass through into
Mouth bypass adjusts pressure loading valve 3 and connects low pressure spray desuperheating pressure reducer 16.
The low pressure spray desuperheating pressure reducer 16 and heat exchangers for district heating 15 are separately connected condenser 17.
The condenser 17 is sequentially connected oxygen-eliminating device 18, feed pump 19 to boiler 6.
In the present embodiment, the high pressure turbine by spray desuperheating relief line utilizes existing high pressure turbine by spray desuperheating relief pipe
Road, but high pressure turbine by maximum stream flow is required to meet the needs of reheater is cooling, it can realize high pressure cylinder completely not into steam,
All main steam flows all enter cold section of reheating by the existing high pressure turbine by pipeline.
In the present embodiment, the low voltage bypass spray desuperheating relief line can realize all steam after reheating hot arc
Heat exchangers for district heating heat exchange is fully entered after the decompression of low voltage bypass spray desuperheating, and heat can also be sent into large-scale accumulation of heat water pot
Accumulation of heat is carried out, to realize that steam turbine is not in shutdown status into steam completely, thermoelectricity unit is changed into single heat supply running mode.
In the present embodiment, the high pressure turbine by spray desuperheating relief line capacity configuration can be the specified main steam flow of boiler
5% to the 100% of amount；
In the present embodiment, the low voltage bypass spray desuperheating relief line capacity configuration can be the specified main steam flow of boiler
5% to the 100% of amount；
In the present embodiment, the thermoelectricity unit is switched under single heating boiler operational mode, the steam feed pump of the unit
Vapour source be switched to I grades of bypasses or II grade bypass spray desuperheatings depressurize steam supplies, spare electrically driven feed pump can also be switched to, herein
All auxiliary device power switchings of the unit of single heating boiler operation are by running another unit of power generation under kind of operating condition in factory
Supply station service is powered to meet full factory.
In the present embodiment, the thermoelectricity unit is switched under single heating boiler operational mode, as shown in Figure 1,1 He of pressure reducing valve
2 standard-sized sheet of heating network entry shut-off valve, high pressure entry shutoff valve 4 and middle indentation mouth shutoff valve 5 close entirely, and entrance bypass adjusts decompression
Whether valve 3 is excessive according to the steam flow for entering heat exchangers for district heating, if excessive can open, steam more than needed is sprayed water
Condenser 17 is introduced after pressure and temperature reducing.
In the present embodiment, the thermoelectricity unit is switched under single heating boiler operational mode, and the unit is in steam turbine not into vapour
In the case where, it needs to the fortune for needing to adjust in steam turbine, condenser, circulation, pumped vacuum systems, industrial cooling circulating water system
Line mode system carries out corresponding adjustment.
In the present embodiment, the bypass in power plant's centralized control system is responsible for controlling high pressure turbine by or low pressure for thermal control module
The bypass valve or spray desuperheating pressure reducer of bypass adjust reject steam flow and parameter, it is cold to meet heat exchangers for district heating, reheating
Section or oxygen-eliminating device or condenser are to reject steam or hydrophobic parameter request.
In the present embodiment, under the thermoelectricity unit list heat supply running mode, station boiler can carry out underload parameter fortune
Row, also way of economic operation meets the needs of heat supply network heat supply.
Under single heat supply running mode, such connecting mode can be to avoid the use to existing hp and lp bypass, i.e.,
Pressure reducing valve 1 and entrance bypass adjust pressure loading valve 3 and remain off；It opens high pressure entry shut-off valve 8 and passes through newly added band
There is the high pressure turbine by of the first pressure reducing valve 7 that main steam is introduced cold section of reheating, at this time the inlet stop valve door 4 of high pressure cylinder, intermediate pressure cylinder
It is turned off with middle indentation mouth shutoff valve 5, all steam eventually pass through by the newly added low pressure with heating network entry shut-off valve 2
Road pressure and temperature reducing pipeline enters heat exchangers for district heating 15 and carries out heat supply.
The thermoelectricity unit is switched under single heating boiler operational mode, and the vapour source of the steam feed pump of the unit is switched to
I grades of bypasses or II grade bypass spray desuperheatings decompression steam supplies, can also be switched to spare electrically driven feed pump, place an order confession in such operating condition
Heat boiler operation unit all auxiliary device power switchings by run in factory power generation another unit supply station service
Meet full factory's power supply.
The thermoelectricity unit is switched under single heating boiler operational mode, and the unit is needed in the case where steam turbine is not into vapour
It will be to the method for operation system for needing to adjust in steam turbine, condenser, circulation, pumped vacuum systems, industrial cooling circulating water system
Carry out corresponding adjustment.
Bypass in power plant's centralized control system is responsible for controlling the bypass of high pressure turbine by or low voltage bypass for thermal control module
Regulating valve or spray desuperheating pressure reducer adjust reject steam flow and parameter, meet cold section of heat exchangers for district heating, reheating or oxygen-eliminating device
Or condenser is to reject steam or hydrophobic parameter request.
Under the thermoelectricity unit list heat supply running mode, station boiler can carry out underload parameter operation, also economic fortune
Line mode meets the needs of heat supply network heat supply.
The utility model has the advantage that
1. both can use existing spray desuperheating decompression bypass, can also be connected in parallel therewith, it can be with existing bypass
Mutual backup.
2. thermoelectricity unit may be implemented is switched to heating boiler completely, accomplish complete thermoelectricity decoupling.
3. thermoelectricity unit may be implemented is switched to heating boiler completely, accomplish maximum depth peak regulation, i.e. the unit
Generated energy be zero.
Embodiment 2
Referring to Fig. 2 and embodiment 1, the difference is that, the low voltage bypass spray desuperheating relief line includes low pressure spray
The inlet of water temperature-decreased pressure reducer 16 and low-pressure inlet shut-off valve 23, the low pressure spray desuperheating pressure reducer 16 is bypassed equipped with entrance
Pressure loading valve 3 is adjusted, the heat exchangers for district heating is in parallel with inlet stop valve 23.
Low-pressure inlet shut-off valve 6 is set on the pipeline of connection condenser, can utmostly utilize existing two in this way
Grade bypass, so that system reform network minimal.But such connection type, it is desirable that original I grades or II grade bypass flow
It wants sufficiently large, on the one hand to meet the requirement of reheater minimum cooling flow, on the other hand to meet the heat supply of heat exchangers for district heating
The demand of amount, therefore generally require I grades or II grades of bypass flows will reach the 20%~40% of boiler main steam flow.At this
In the case of kind, boiler is reduced to load 40% hereinafter, single heat supply running mode of two-stage bypass can be realized.
Embodiment 3
Referring to Fig. 3 and embodiment 1 the difference is that, big-flow high-pressure is additionally provided between the boiler 6 and high pressure cylinder 20
Spray desuperheating relief line is bypassed, the big-flow high-pressure bypass spray desuperheating relief line and high pressure turbine by spray desuperheating depressurize
Pipeline is in parallel, and the big-flow high-pressure bypass spray desuperheating relief line includes big flow spray desuperheating pressure reducer 22, described big
The inlet of flow spray desuperheating pressure reducer 22 is connected with high pressure entry shut-off valve 8 and pressure reducing valve 7.The high pressure entry cut-off
Valve 8 is connected with boiler, and the outlet of the big flow spray desuperheating pressure reducer 22 connects reheater 21.
The capacity of the big-flow high-pressure bypass spray desuperheating relief line wants that boiler main steam flow can be received
20%~40%.Other systems component and connecting mode are identical with embodiment 1.
Embodiment 4
Referring to Fig. 4 and embodiment 1 the difference is that, between high pressure turbine by and low voltage bypass spray desuperheating relief line
Setting is intermediate to get in touch with pipeline, and the intermediate contact piping connection high pressure turbine by spray desuperheating relief line subtracts with low voltage bypass water spray
Warm relief line, and the shutdown shut-off valve 25 being arranged on intermediate liaison tube road；The series operation bypassed by two-stage, Ke Yibao
It holds partial admission sequence and passes through high pressure cylinder, reheater and intermediate pressure cylinder and low pressure (LP) cylinder, so that unit operates in underload generated energy shape
Under state.
Specifically, the export pipeline of the high pressure turbine by temperature-decreased pressure reducer 9 is equipped with the second pressure reducing valve 24, described second subtracts
The first leading point 26 is equipped between pressure valve 24 and high pressure turbine by temperature-decreased pressure reducer 9, the shutdown shut-off valve 25 is set to first and draws
Between point 26 and low voltage bypass spray desuperheating relief line.
In the present embodiment, unit does not operate in single Heating State, but operates in underload generating state, this for
Power plant's depth peak regulation has very big value:
1. the series operation of existing two-stage bypass can be realized, two-stage bypass can also be created and carry out series operation；
2. thermoelectricity unit may be implemented is switched to heating boiler completely, accomplish complete thermoelectricity decoupling；
3. making unit work in extremely low generation load state, unit can increase sharply generation load, and flexibility is greater than single supply
Warm status.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent substitution, improvement and etc. done should be included in the utility model
Within the scope of protection.
Claims (8)
1. a kind of system for realizing three kinds of state switchover operations of thermoelectricity unit comprising boiler (6), boiler (6) connection are high
Cylinder pressure (20), boiler (6) is interior to be equipped with reheater (21), and the high pressure cylinder (20) is connected with reheater (21), in the boiler (6)
Reheater (21) connect intermediate pressure cylinder (10), medium pressure cylinder (10) connect low pressure (LP) cylinder (11), low pressure (LP) cylinder (11) connect generator
(12), which is characterized in that further include high pressure turbine by spray desuperheating relief line, low voltage bypass spray desuperheating relief line and heat
Net heater (15), the high pressure turbine by spray desuperheating relief line are located between boiler (6) and high pressure cylinder (20), the high pressure
It bypasses spray desuperheating relief line or low voltage bypass spray desuperheating relief line includes spray desuperheating pressure reducer, the heat supply network heating
Device (15) is connected with the pipeline after spray desuperheating pressure reducer；The heat exchangers for district heating (15) is connected with external heating system；The
Under one state be cogeneration of heat and power state, i.e., boiler generate steam by high pressure cylinder (20), reheater (21), intermediate pressure cylinder (10),
Low pressure (LP) cylinder (11) and generator (12)；It is single Heating State under second state, the steam that boiler generates is sprayed by high pressure turbine by
Water pressure and temperature reducing pipeline, reheater (21), low voltage bypass spray desuperheating relief line, heat exchangers for district heating (15), outer heating system,
Without high pressure cylinder (20), intermediate pressure cylinder (10) and low pressure (LP) cylinder (11)；It is underload generating state under the third state, what boiler generated
Steam a part passes through high pressure turbine by spray desuperheating relief line, reheater (21), low voltage bypass spray desuperheating relief line, heat
Net heater (15), outer heating system；Another part is carried out by high pressure cylinder (20), intermediate pressure cylinder (10) and low pressure (LP) cylinder (11)
Unit underload generator operation.
2. the system according to claim 1 for realizing three kinds of state switchover operations of thermoelectricity unit, which is characterized in that the height
Pressure bypass spray desuperheating relief line can utilize the hp by-pass system of existing unit, and one end connects main steam line, in addition
One end connects cold section of the reheater (21) of boiler (6), and the high pressure turbine by spray desuperheating relief line includes high pressure turbine by water spray
The inlet of temperature-decreased pressure reducer (9), the high pressure turbine by spray desuperheating pressure reducer (9) is connected with pressure reducing valve (1).
3. the system according to claim 2 for realizing three kinds of state switchover operations of thermoelectricity unit, which is characterized in that the height
Pressure bypass spray desuperheating relief line can also be the newly-increased big-flow high-pressure bypass spray desuperheating in parallel with existing high pressure turbine by
Relief line；The big-flow high-pressure bypass spray desuperheating relief line includes big flow spray desuperheating pressure reducer (22), described
The inlet of big flow spray desuperheating pressure reducer (22) is connected with high pressure entry shut-off valve (8) and the first pressure reducing valve (7)；The height
Pressure inlet stop valve (8) is connected with boiler, and outlet connection reheater (21) of the big flow spray desuperheating pressure reducer (22) is cold
Section.
4. the system according to claim 2 or 3 for realizing three kinds of state switchover operations of thermoelectricity unit, which is characterized in that institute
The low-pressure bypass system of existing unit can be utilized by stating low voltage bypass spray desuperheating relief line, and one end connects leading point (13),
After entrance bypasses and adjusts pressure loading valve (3) and low pressure spray desuperheating pressure reducer (16), two bye-passes are separated, are passed through all the way
Shut-off valve (23) arrives condenser, arrives heat exchangers for district heating (15) all the way.
5. the system according to claim 2 or 3 for realizing three kinds of state switchover operations of thermoelectricity unit, which is characterized in that institute
Stating low voltage bypass spray desuperheating relief line can also be the newly-increased big flow low voltage bypass water spray in parallel with existing low voltage bypass
Pressure and temperature reducing pipeline comprising big flow low voltage bypass spray desuperheating depressurizes (14) and its entrance adjusts pressure reducing valve (2), then connects
It is connected to heat exchangers for district heating (15).
6. the system according to claim 1 for realizing three kinds of state switchover operations of thermoelectricity unit, which is characterized in that the height
The intermediate contact piping connection high pressure turbine by spray desuperheating decompression of setting between pressure bypass and low voltage bypass spray desuperheating relief line
Pipeline and low voltage bypass spray desuperheating relief line, and the shutdown shut-off valve (66) being arranged on intermediate liaison tube road；Pass through two
The series operation of grade bypass can pass through high pressure cylinder, reheater and intermediate pressure cylinder and low pressure (LP) cylinder into vapour sequence with holding part, so that machine
Group operates under underload generated energy state.
7. it is according to claim 4 realize three kinds of state switchover operations of thermoelectricity unit system, which is characterized in that it is described enter
Mouthful bypass adjust pressure loading valve (3) and low pressure spray desuperheating pressure reducer (16) using integral type or use split type；It is described
High pressure turbine by spray desuperheating pressure reducer and pressure reducing valve (1) using integral type or using split type.
8. the system according to claim 1 for realizing three kinds of state switchover operations of thermoelectricity unit, which is characterized in that the height
Pressure bypass spray desuperheating relief line capacity configuration is 5% to the 100% of the specified main steam flow of boiler；The low voltage bypass spray
The configuration of water pressure and temperature reducing circuit capacity is 5% to the 100% of the specified main steam flow of boiler.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820469806 | 2018-04-03 | ||
| CN2018204698069 | 2018-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208982123U true CN208982123U (en) | 2019-06-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468574A (en) * | 2018-04-03 | 2018-08-31 | 赫普科技发展（北京）有限公司 | A kind of system for realizing three kinds of state switchover operations of thermoelectricity unit |
| CN110953571A (en) * | 2019-10-16 | 2020-04-03 | 孙少强 | Heat supply steam residual pressure cascade utilization system applied to coal-fired heat supply unit |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468574A (en) * | 2018-04-03 | 2018-08-31 | 赫普科技发展（北京）有限公司 | A kind of system for realizing three kinds of state switchover operations of thermoelectricity unit |
| CN110953571A (en) * | 2019-10-16 | 2020-04-03 | 孙少强 | Heat supply steam residual pressure cascade utilization system applied to coal-fired heat supply unit |
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Effective date of registration: 20201022 Address after: Room 201, 2 / F, building 12, No.18, Kechuang 13th Street, Daxing Economic and Technological Development Zone, Beijing 100176 Patentee after: HEPP Energy Environment Technology Co.,Ltd. Address before: 100176 Beijing branch of Daxing District economic and Technological Development Zone thirteen Street No. 18 Building No. 12 hospital Patentee before: HEPU Technology Development (Beijing) Co.,Ltd. |
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