CN104732451B - Low-pressure coal saver Evaluation on Energy Saving method for power plant therrmodynamic system - Google Patents
Low-pressure coal saver Evaluation on Energy Saving method for power plant therrmodynamic system Download PDFInfo
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Abstract
The invention discloses a kind of low-pressure coal saver Evaluation on Energy Saving method for power plant therrmodynamic system, including step 1：Obtain the heat balance diagram parameter of the power plant therrmodynamic system before installing low-pressure coal saver；Step 2：Heat balance diagram parameter of the power plant therrmodynamic system after low-pressure coal saver is installed in parallel or series is calculated, the situation of change of extraction flows at different levels is obtained in conjunction with step 1；Step 3：The situation of change and steam flow conservation principle for the heater extraction flows at different levels being calculated according to step 2, calculate the variable quantity of steam turbine acting ability；Step 4：The variable quantity of power plant's coal consumption amount is calculated, for assessing low-pressure coal saver amount of energy saving, wherein, the variable quantity of power plant's coal consumption amount is bigger, then low-pressure coal saver amount of energy saving is higher.The present invention is advantageous to reasonable installation low-pressure coal saver；The load variations situation of every grade of heater can not only be shown, and influence of the change of power for auxiliary machinery to system coal consumption can be shown so that result of calculation is more true and reliable.
Description
Technical field
The present invention relates to low-pressure coal saver energy-saving field, more particularly to a kind of low pressure for power plant therrmodynamic system to save coal
Device Evaluation on Energy Saving method.
Background technology
As country is to the pay attention to day by day of energy-saving and emission-reduction, boiler efficiency is improved, reduction gross coal consumption rate is increasingly subject to power plant
Great attention and propose a series of important conservation measures.The 50% of thermal power plant consumption coal in China total output, its
Heat loss due to exhaust gas is maximum in station boiler various heat losses one, typically 5%~8%, accounts for boiler Total heat loss's
80% or higher.The principal element for influenceing heat loss due to exhaust gas is exhaust gas temperature, and generally, exhaust gas temperature often raises 20
DEG C, heat loss due to exhaust gas increase by 0.6%~1.0%.In China's active service fired power generating unit exhaust gas temperature generally maintain 125~
150 DEG C of left and right horizontals, high fume temperature are a universal phenomena.Rationally using boiler exhaust gas waste heat to improving unit efficiency, reality
Existing national energy-saving emission reduction strategic objective plays vital effect.
Low-pressure coal saver refers to after boiler air preheater, in the back-end ductwork before desulfurizing tower, absorb pot
Stove tail flue gas waste-heat condensate, the heat of recovery is transferred to Steam Turbine Regenerative System, reduces extracted steam from turbine, is realized
The cascade utilization of the energy, so as to reach the purpose of energy-saving and emission-reduction.Because heating medium uses steam turbine condensate, pressure relative to
Conventional economizer wants low more, so referred to as low-pressure coal saver, also referred to as low-level (stack-gas) economizer, gas cooler.
The energy-saving effect evaluation for low-pressure economizer system mainly uses equivalent enthalpy drop method at present.Equivalent enthalpy drop method is base
In thermodynamic (al) heat to power output principle, it is contemplated that the characteristics of equipment quality, therrmodynamic system structure and parameter, by tight theory
Deduce, export several thermodynamic analysis parameter HjAnd ηjDeng to study a kind of method of thermal technology's conversion and energy utilization degree.It
It can be not only used for the calculating of overall therrmodynamic system, it can also be used to analyzed in the office of therrmodynamic system quantitative.As a kind of heat regenerative system office
The simple and quick method of portion quantitative technique analysis, it the advantages of be numerous and diverse calculating that whole system is replaced with simple and direct local operation,
Research those parts relevant with system change carry out Local Quantitative.
Energy-saving analysis is carried out to the unit of Installing Low Pressure Economizer using equivalent enthalpy drop method, first should be by low-pressure coal saver
The heat of absorption regards pure heat input as, and theoretical according to equivalent enthalpy drop, the enthalpy that should calculate heater condensates at different levels first rises τi
With the thermal discharge γ of heater condensates at different levelsi, and the enthalpy liter σ of reheated steam, calculate institute's having heaters according to above-mentioned data
The equivalent enthalpy drop H that exclusion 1kg draws gas1~HjWith efficiency etas at different levels of drawing gas1~ηj, according to the condensing water flow in low-pressure coal saver and
Main steam flow calculates flow coefficient αd, according to above-mentioned data can calculate device acting ability lifting Δ H and device
The lifting δ η of efficiency, the coal consumption amount of low-pressure coal saver saving can be calculated according to unit coal consumption.
When being analyzed using equivalent enthalpy drop method therrmodynamic system, it should with the initial steam flow and fuel heating load of unit
Premised on being definite value, and system just, end condition keep constant, heat regenerative system respectively draws gas what parameter will not be local because of system
Change and produce change, the change of heat regenerative system heat can only influence the change of the power of the assembling unit.Equivalent enthalpy drop method is in calculating process
In, it is only necessary to calculated according to the parameter of heat regenerative system, can not intuitively show the load variations situation of every grade of heater,
Influence of the change of power for auxiliary machinery to system coal consumption can not be shown.
The content of the invention
In order to solve the shortcomings that prior art, the present invention provides a kind of low-pressure coal saver section for power plant therrmodynamic system
Can appraisal procedure.
The technical scheme that the present invention takes is：
Low-pressure coal saver is connected to the Steam Turbine Regenerative System of power plant therrmodynamic system by mode in series or in parallel
Optional position.Low-pressure coal saver is in parallel with the Steam Turbine Regenerative System of power plant therrmodynamic system, in Steam Turbine Regenerative System
Whole condensates carry out heat exchange, absorption boiler exhaust gas waste heat is solidifying for improving by low-pressure coal saver with boiler tail flue gas
The temperature born water.Low-pressure coal saver is connected with the Steam Turbine Regenerative System of power plant therrmodynamic system, in Steam Turbine Regenerative System
Partial coagulation water carries out heat exchange, absorption boiler exhaust gas waste heat is solidifying for improving by low-pressure coal saver with boiler tail flue gas
The temperature born water.
Condensate after temperature rise is returned in Steam Turbine Regenerative System, condenses water out water in Steam Turbine Regenerative System
On the premise of temperature keeps constant, reduce the amount of drawing gas of steam turbine so that more steam can pushing turbine acting, increase
The acting ability of steam turbine, the thermal efficiency of whole unit is improved, reduce the coal consumption amount of unit.
A kind of low-pressure coal saver Evaluation on Energy Saving method for being parallel to power plant therrmodynamic system, comprises the following steps：
Step 1：Obtain the heat balance diagram parameter of the power plant therrmodynamic system before low-pressure coal saver in parallel；
Step 2：Low-pressure coal saver is connected in parallel on power plant therrmodynamic system, calculates power plant therrmodynamic system heat balance diagram now
Parameter, the situation of change of extraction flows at different levels is obtained in conjunction with step 1；
Step 3：The situation of change and steam flow conservation for the heater extraction flows at different levels being calculated according to step 2 are former
Reason, calculate the variation delta Q of steam turbine acting ability；
Step 4：The variable quantity of power plant's coal consumption amount is calculated, for assessing low-pressure coal saver amount of energy saving, wherein, power plant's coal consumption amount
Variable quantity it is bigger, then low-pressure coal saver amount of energy saving is higher, and its calculation formula is as follows：
ηcp=ηbηpηe (2)
Wherein, Δ b represents the variable quantity of power plant's coal consumption amount；B represents power plant's coal consumption amount；ηcp1Represent unit efficiency after transforming；
ηcp0Represent unit efficiency before transforming；ηeRepresent turbine efficiency；P represents unit generation power；q0Heat consumption before expression Transformation of Unit
Rate；ηcpRepresent unit efficiency；ηbRepresent boiler efficiency；ηpRepresent pipeline efficiency.
The heat balance diagram parameter, include heater condensing water flows at different levels, the temperature and pressure of power plant therrmodynamic system,
And heater extraction flows at different levels, temperature and pressure, and heater condensate flow at different levels, temperature and pressure.
Respectively the process of the situation of change of calculating level extraction flow is in the step 2：
Heat Balance Calculation is carried out to low-pressure heaters at different levels according to equation below, obtains the change of each calculating level extraction flow
Change,
Qj+Γj-1+Θj+1=Γj+1+Θj-1 (4)
Qj=Dqj×qj (5)
Γj=Dγj×γj (6)
Θj=Dτj×τj (7)
Wherein, QjRepresent that j level heaters draw gas the heat brought into, unit kJ；ΓjRepresent j level heater condensates bring into or
The heat gone out, unit kJ；ΘjRepresent the heat that j level heater condensates are brought into or gone out, unit kJ；DqjRepresent the heating of j levels
Device extraction flow, unit kg；DγjRepresent j level heater condensate flows, unit kg；DτjRepresent that j levels heater condenses current
Amount, unit kg；qjRepresent that j level heaters draw gas enthalpy, unit kJ/kg；γjRepresent j level heater condensate enthalpies, unit
For kJ/kg；τjRepresent j level heater condensate enthalpies, unit kJ/kg.
The variation delta Q calculation formula of steam turbine acting ability in the step 3 is：
The variation delta Q calculation formula of steam turbine acting ability is：
Δ Q=∑ Δs Dj×qj-ΔDn×qn-ΔN (8)
ΔDj=Dj'-Dj (9)
Wherein：Dj' represent original system jth heater extraction flow；DjRepresent the jth heater extraction flow of existing system；
ΔDnRepresent low pressure (LP) cylinder exhaust steam flow changing value；qnRepresent low pressure (LP) cylinder steam discharge enthalpy；Extraction flow is smaller, steam turbine acting ability
It is bigger；Δ N represents air-introduced machine power increment value；Q1And Q2The front and rear air-introduced machine flue gas flow of transformation is represented respectively；P1And P2Respectively
Represent the front and rear air-introduced machine inlet flue gas pressure of transformation；η represents fan efficiency, typically takes about definite value.
A kind of low-pressure coal saver Evaluation on Energy Saving method for being series at power plant therrmodynamic system, comprises the following steps：
Step 1：The heat balance diagram parameter of power plant therrmodynamic system before acquisition series connection low-pressure coal saver；
Step 2：Heat balance diagram parameter of the power plant therrmodynamic system after low-pressure coal saver of connecting is calculated, in conjunction with step 1
Obtain the situation of change of extraction flows at different levels；
Step 3：The situation of change and steam flow conservation for the heater extraction flows at different levels being calculated according to step 2 are former
Reason, calculate the variation delta Q of steam turbine acting ability；
Step 4：The variable quantity of power plant's coal consumption amount is calculated, for assessing low-pressure coal saver amount of energy saving, wherein, power plant's coal consumption amount
Variable quantity it is bigger, then low-pressure coal saver amount of energy saving is higher, and its calculation formula is as follows：
ηcp=ηbηpηe (2)
Wherein, Δ b represents the variable quantity of power plant's coal consumption amount；B represents power plant's coal consumption amount；ηcp1Represent unit efficiency after transforming；
ηcp0Represent unit efficiency before transforming；ηeRepresent turbine efficiency；P represents unit generation power；q0Heat consumption before expression Transformation of Unit
Rate；ηcpRepresent unit efficiency；ηbRepresent boiler efficiency；ηpRepresent pipeline efficiency.
Beneficial effects of the present invention are：
(1) low-pressure coal saver Evaluation on Energy Saving method of the invention, is advantageous to reasonable installation low-pressure coal saver, and more effectively
Unit efficiency is improved using boiler exhaust gas waste heat in ground；
(2) low-pressure coal saver Evaluation on Energy Saving method of the invention is clear, it can be readily appreciated that this method can not only be shown
The load variations situation of every grade of heater, and the value added of air-introduced machine power consumption is considered in calculating process, subsidiary engine can be shown
Influence of the change of power to system coal consumption so that result of calculation is more true and reliable.
Brief description of the drawings
Fig. 1 is power plant therrmodynamic system schematic diagram；
Fig. 2 is the structural representation that low-pressure coal saver is connected in parallel in power plant therrmodynamic system；
Fig. 3 is the structural representation that low-pressure coal saver is connected in power plant therrmodynamic system.
Embodiment
The present invention will be further described with embodiment below in conjunction with the accompanying drawings：
As shown in figure 1, not install the power plant therrmodynamic system before low-pressure coal saver, the system includes 1#~3# high pressures
Heater, oxygen-eliminating device, 5#~8# low-pressure heaters.
Add as shown in Fig. 2 low-pressure coal saver is connected in parallel on 6# the and 7# low pressure concatenated in the power plant therrmodynamic system shown in Fig. 1
The both ends of hot device, the appraisal procedure of the low-pressure coal saver energy-saving efficiency, comprise the following steps：
Step 1：Obtain the heat balance diagram parameter of the power plant therrmodynamic system before low-pressure coal saver in parallel；Wherein, heat is flat
Weigh graph parameter, includes heater condensing water flows at different levels, the temperature and pressure of power plant therrmodynamic system, and heater at different levels draws gas
Flow, temperature and pressure, and heater condensate flow at different levels, temperature and pressure.
By taking the power plant therrmodynamic system shown in Fig. 1 as an example, each work of 6# and 7# low-pressure heaters before low-pressure coal saver is installed
Heat balance number under condition is according to as shown in table 1.
Heat balance number evidence before certain unit installing low-pressure coal saver of table 1 under each operating mode of 6# and 7# low-pressure heaters
Step 2：Low-pressure coal saver is connected in parallel on power plant therrmodynamic system, calculates power plant therrmodynamic system heat balance diagram now
Parameter, the situation of change of extraction flows at different levels is obtained in conjunction with step 1；
Respectively the process of the situation of change of calculating level extraction flow is in the step 2：
Heat Balance Calculation is carried out to low-pressure heaters at different levels according to equation below, obtains the change of each calculating level extraction flow
Change,
Qj+Γj-1+Θj+1=Γj+1+Θj-1 (4)
Qj=Dqj×qj (5)
Γj=Dγj×γj (6)
Θj=Dτj×τj (7)
Wherein, QjRepresent that j level heaters draw gas the heat brought into, unit kJ；ΓjRepresent j level heater condensates bring into or
The heat gone out, unit kJ；ΘjRepresent the heat that j level heater condensates are brought into or gone out, unit kJ；DqjRepresent the heating of j levels
Device extraction flow, unit kg；DγjRepresent j level heater condensate flows, unit kg；DτjRepresent that j levels heater condenses current
Amount, unit kg；qjRepresent that j level heaters draw gas enthalpy, unit kJ/kg；γjRepresent j level heater condensate enthalpies, unit
For kJ/kg；τjRepresent j level heater condensate enthalpies, unit kJ/kg.
As shown in Fig. 2 go out the water side of low-pressure coal saver according to the thermal discharge of low-pressure coal saver fume side calculating (or actual measurement)
Flow D0, the water-carrying capacity D by low-pressure coal saver is subtracted with total condensing capacity D0, can obtain by with low-pressure coal saver simultaneously
The condensing capacity D' of the 7# and 6# low-pressure heaters of connection, i.e. D'=D-D0。
The situation of change of extraction flows at different levels can be calculated according to above-mentioned formula.Table 2 be installing low-pressure coal saver before and after
The contrast of the low-pressure heater amounts of drawing gas at different levels.
Table 2 installs the low-pressure heater extraction flow contrast before and after heat exchanger
| Original system flow (kg) | Existing flow system flow (kg) | Specific enthalpy (kJ/kg) | |
| #8 | 29250 | 30400 | 2509.1 |
| #7 | 28530 | 14450 | 2643.2 |
| #6 | 25980 | 13160 | 2768.6 |
| #5 | 41120 | 41120 | 2958.7 |
| Low pressure (LP) cylinder steam discharge | 591370 | 617120 | 2318.6 |
As seen from Table 2, after low-pressure coal saver has been installed in parallel connection, due to flowing through the condensate of 7# and 6# low-pressure heaters
Amount is reduced, the heat reduction of drawing gas needed for 7# and 6# low-pressure heaters.The position of drawing gas of original system is constant, is saved so installing low pressure additional
7# and 6# low-pressure heaters extraction temperature and pressure are unchanged after coal device, and only extraction flow changes.In view of original
The design of system low-voltage Heater Terminal Temperature Difference, the out temperature that condensate flows through heaters at different levels also do not change.
Step 3：The situation of change and steam flow conservation for the heater extraction flows at different levels being calculated according to step 2 are former
Reason, calculate the variation delta Q of steam turbine acting ability；
The variation delta Q calculation formula of steam turbine acting ability is：
Δ Q=∑ Δs Dj×qj-ΔDn×qn-ΔN (8)
ΔDj=Dj'-Dj(9)
Wherein：Dj' represent original system jth heater extraction flow；DjRepresent the jth heater extraction flow of existing system；
ΔDnRepresent low pressure (LP) cylinder exhaust steam flow changing value；qnRepresent low pressure (LP) cylinder steam discharge enthalpy；Extraction flow is smaller, steam turbine acting ability
It is bigger；Δ N represents air-introduced machine power increment value；Q1And Q2The front and rear air-introduced machine flue gas flow of transformation is represented respectively；P1And P2Respectively
Represent the front and rear air-introduced machine inlet flue gas pressure of transformation；η represents fan efficiency, typically takes about definite value.
Step 4：The variable quantity of power plant's coal consumption amount is calculated, for assessing low-pressure coal saver amount of energy saving, wherein, power plant's coal consumption amount
Variable quantity it is bigger, then low-pressure coal saver amount of energy saving is higher.
Unit Installing Low Pressure Economizer, while steam turbine acting ability is improved, it can also cause the increasing of air inducing acc power
Greatly, it is necessary to be paid attention to when calculating.Air-introduced machine power increment value can be obtained by calculating or surveying.Steam turbine does function
It is that steam turbine does work ability raising value only that power raising value, which subtracts air-introduced machine power increment value,.Steam turbine does work the carrying of ability only
Height, represent in the case where other conditions are constant, by Installing Low Pressure Economizer steam turbine can be made to do more work(, i.e. steamer
Engine efficiency is improved, wherein, unit efficiency=boiler efficiency × steam turbine efficiency × pipeline efficiency.
The raising of steam turbine efficiency, the raising of unit efficiency is necessarily brought, therefore, low-pressure coal saver amount of energy saving is higher, steamer
Engine efficiency improves bigger, and unit efficiency is higher.
The calculation formula of the variable quantity of power plant's coal consumption amount is as follows：
ηcp=ηbηpηe (2)
Wherein, Δ b represents the variable quantity of power plant's coal consumption amount；B represents power plant's coal consumption amount；ηcp1Represent unit efficiency after transforming；
ηcp0Represent unit efficiency before transforming；ηeRepresent turbine efficiency；P represents unit generation power；q0Heat consumption before expression Transformation of Unit
Rate；ηcpRepresent unit efficiency；ηbRepresent boiler efficiency；ηpRepresent pipeline efficiency.
As shown in figure 3, low-pressure coal saver be connected on the power plant therrmodynamic system shown in Fig. 1 6# and 7# low-pressure heaters it
Between, the appraisal procedure of the low-pressure coal saver energy-saving efficiency of the low-pressure coal saver mounting means, power plant is connected in parallel on low briquetting machine
Therrmodynamic system is consistent, specifically includes following steps：
Step 1：The heat balance diagram parameter of power plant therrmodynamic system before acquisition series connection low-pressure coal saver；
Step 2：Heat balance diagram parameter of the power plant therrmodynamic system after low-pressure coal saver of connecting is calculated, in conjunction with step 1
Obtain the situation of change of extraction flows at different levels；
Step 3：The situation of change and steam flow conservation for the heater extraction flows at different levels being calculated according to step 2 are former
Reason, calculate the variation delta Q of steam turbine acting ability；
Step 4：The variable quantity of power plant's coal consumption amount is calculated, for assessing low-pressure coal saver amount of energy saving, wherein, power plant's coal consumption amount
Variable quantity it is bigger, then low-pressure coal saver amount of energy saving is higher, and its calculation formula is as follows：
ηcp=ηbηpηe (2)
Wherein, Δ b represents the variable quantity of power plant's coal consumption amount；B represents power plant's coal consumption amount；ηcp1Represent unit efficiency after transforming；
ηcp0Represent unit efficiency before transforming；ηeRepresent turbine efficiency；P represents unit generation power；q0Heat consumption before expression Transformation of Unit
Rate；ηcpRepresent unit efficiency；ηbRepresent boiler efficiency；ηpRepresent pipeline efficiency.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (6)
- A kind of 1. low-pressure coal saver Evaluation on Energy Saving method for being parallel to power plant therrmodynamic system, it is characterised in that including following step Suddenly：Step 1：Obtain the heat balance diagram parameter of the power plant therrmodynamic system before low-pressure coal saver in parallel；Step 2：Low-pressure coal saver is connected in parallel on power plant therrmodynamic system, calculates power plant therrmodynamic system heat balance diagram ginseng now Number, the situation of change of extraction flows at different levels is obtained in conjunction with step 1；Step 3：The situation of change and steam flow conservation principle for the heater extraction flows at different levels being calculated according to step 2, Calculate the variation delta Q of steam turbine acting ability；Step 4：The variable quantity of power plant's coal consumption amount is calculated, for assessing low-pressure coal saver amount of energy saving, wherein, the change of power plant's coal consumption amount Change amount is bigger, then low-pressure coal saver amount of energy saving is higher, and its calculation formula is as follows：<mrow> <mi>&Delta;</mi> <mi>b</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&eta;</mi> <mrow> <mi>c</mi> <mi>p</mi> <mn>1</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>&eta;</mi> <mrow> <mi>c</mi> <mi>p</mi> <mn>0</mn> </mrow> </msub> </mrow> <msub> <mi>&eta;</mi> <mrow> <mi>c</mi> <mi>p</mi> <mn>1</mn> </mrow> </msub> </mfrac> <mo>&times;</mo> <mi>b</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>ηcp=ηbηpηe (2)<mrow> <msub> <mi>&eta;</mi> <mi>e</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mn>3600</mn> <mrow> <mo>(</mo> <mi>P</mi> <mo>+</mo> <mi>&Delta;</mi> <mi>Q</mi> <mo>)</mo> </mrow> </mrow> <mrow> <mi>P</mi> <mo>&times;</mo> <msub> <mi>q</mi> <mn>0</mn> </msub> </mrow> </mfrac> <mo>&times;</mo> <mn>100</mn> <mi>%</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>Wherein, Δ b represents the variable quantity of power plant's coal consumption amount；B represents power plant's coal consumption amount；ηcp1Represent unit efficiency after transforming；ηcp0 Represent unit efficiency before transforming；ηeRepresent turbine efficiency；P represents unit generation power；q0Heat consumption rate before expression Transformation of Unit； ηcpRepresent unit efficiency；ηbRepresent boiler efficiency；ηpRepresent pipeline efficiency；Respectively the process of the situation of change of calculating level extraction flow is in the step 2：Heat Balance Calculation is carried out to low-pressure heaters at different levels according to equation below, obtains the change of each calculating level extraction flow,Qj+Γj-1+Θj+1=Γj+1+Θj-1 (4)Qj=Dqj×qj (5)Γj=Dγj×γj (6)Θj=Dτj×τj (7)Wherein, QjRepresent that j level heaters draw gas the heat brought into, unit kJ；ΓjRepresent that j level heater condensates are brought into or gone out Heat, unit kJ；ΘjRepresent the heat that j level heater condensates are brought into or gone out, unit kJ；DqjRepresent that j level heaters are taken out Steam flow amount, unit kg；DγjRepresent j level heater condensate flows, unit kg；DτjJ level heater condensing water flows are represented, Unit is kg；qjRepresent that j level heaters draw gas enthalpy, unit kJ/kg；γjJ level heater condensate enthalpies are represented, unit is kJ/kg；τjRepresent j level heater condensate enthalpies, unit kJ/kg；The variation delta Q calculation formula of steam turbine acting ability in the step 3 is：Δ Q=∑ Δs Dj×qj-ΔDn×qn-ΔN (8)ΔDj=Dj'-Dj (9)<mrow> <mi>&Delta;</mi> <mi>N</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Q</mi> <mn>2</mn> </msub> <msub> <mi>P</mi> <mn>2</mn> </msub> <mo>-</mo> <msub> <mi>Q</mi> <mn>1</mn> </msub> <msub> <mi>P</mi> <mn>1</mn> </msub> </mrow> <mrow> <mn>1000</mn> <mi>&eta;</mi> <mo>&times;</mo> <mn>3600</mn> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>10</mn> <mo>)</mo> </mrow> </mrow>Wherein：Dj' represent original system jth heater extraction flow；DjRepresent the jth heater extraction flow of existing system；ΔDn Represent low pressure (LP) cylinder exhaust steam flow changing value；qnRepresent low pressure (LP) cylinder steam discharge enthalpy；Extraction flow is smaller, and steam turbine acting ability is got over Greatly；Δ N represents air-introduced machine power increment value；Q1And Q2The front and rear air-introduced machine flue gas flow of transformation is represented respectively；P1And P2Table respectively Show the front and rear air-introduced machine inlet flue gas pressure of transformation；η represents fan efficiency, takes about definite value.
- 2. a kind of low-pressure coal saver Evaluation on Energy Saving method for being parallel to power plant therrmodynamic system as claimed in claim 1, it is special Sign is, the heat balance diagram parameter, includes heater extraction flows at different levels, the temperature and pressure of power plant therrmodynamic system.
- 3. a kind of low-pressure coal saver Evaluation on Energy Saving method for being parallel to power plant therrmodynamic system as claimed in claim 1, it is special Sign is, the heat balance diagram parameter, includes heater condensing water flow, temperature and the pressures at different levels of power plant therrmodynamic system Power, and heater condensate flow at different levels, temperature and pressure.
- 4. a kind of low-pressure coal saver Evaluation on Energy Saving method for being series at power plant therrmodynamic system, comprises the following steps：Step 1：The heat balance diagram parameter of power plant therrmodynamic system before acquisition series connection low-pressure coal saver；Step 2：Heat balance diagram parameter of the power plant therrmodynamic system after low-pressure coal saver of connecting is calculated, is obtained in conjunction with step 1 The situation of change of extraction flows at different levels；Step 3：The situation of change and steam flow conservation principle for the heater extraction flows at different levels being calculated according to step 2, Calculate the variation delta Q of steam turbine acting ability；Step 4：The variable quantity of power plant's coal consumption amount is calculated, for assessing low-pressure coal saver amount of energy saving, wherein, the change of power plant's coal consumption amount Change amount is bigger, then low-pressure coal saver amount of energy saving is higher, and its calculation formula is as follows：<mrow> <mi>&Delta;</mi> <mi>b</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&eta;</mi> <mrow> <mi>c</mi> <mi>p</mi> <mn>1</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>&eta;</mi> <mrow> <mi>c</mi> <mi>p</mi> <mn>0</mn> </mrow> </msub> </mrow> <msub> <mi>&eta;</mi> <mrow> <mi>c</mi> <mi>p</mi> <mn>1</mn> </mrow> </msub> </mfrac> <mo>&times;</mo> <mi>b</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>ηcp=ηbηpηe (2)<mrow> <msub> <mi>&eta;</mi> <mi>e</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mn>3600</mn> <mrow> <mo>(</mo> <mi>P</mi> <mo>+</mo> <mi>&Delta;</mi> <mi>Q</mi> <mo>)</mo> </mrow> </mrow> <mrow> <mi>P</mi> <mo>&times;</mo> <msub> <mi>q</mi> <mn>0</mn> </msub> </mrow> </mfrac> <mo>&times;</mo> <mn>100</mn> <mi>%</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>Wherein, Δ b represents the variable quantity of power plant's coal consumption amount；B represents power plant's coal consumption amount；ηcp1Represent unit efficiency after transforming；ηcp0 Represent unit efficiency before transforming；ηeRepresent turbine efficiency；P represents unit generation power；q0Heat consumption rate before expression Transformation of Unit； ηcpRepresent unit efficiency；ηbRepresent boiler efficiency；ηpRepresent pipeline efficiency；Respectively the process of the situation of change of calculating level extraction flow is in the step 2：Heat Balance Calculation is carried out to low-pressure heaters at different levels according to equation below, obtains the change of each calculating level extraction flow,Qj+Γj-1+Θj+1=Γj+1+Θj-1 (4)Qj=Dqj×qj (5)Γj=Dγj×γj (6)Θj=Dτj×τj (7)Wherein, QjRepresent that j level heaters draw gas the heat brought into, unit kJ；ΓjRepresent that j level heater condensates are brought into or gone out Heat, unit kJ；ΘjRepresent the heat that j level heater condensates are brought into or gone out, unit kJ；DqjRepresent that j level heaters are taken out Steam flow amount, unit kg；DγjRepresent j level heater condensate flows, unit kg；DτjJ level heater condensing water flows are represented, Unit is kg；qjRepresent that j level heaters draw gas enthalpy, unit kJ/kg；γjJ level heater condensate enthalpies are represented, unit is kJ/kg；τjRepresent j level heater condensate enthalpies, unit kJ/kg；The variation delta Q calculation formula of steam turbine acting ability in the step 3 is：Δ Q=∑ Δs Dj×qj-ΔDn×qn-ΔN (8)ΔDj=Dj'-Dj (9)<mrow> <mi>&Delta;</mi> <mi>N</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Q</mi> <mn>2</mn> </msub> <msub> <mi>P</mi> <mn>2</mn> </msub> <mo>-</mo> <msub> <mi>Q</mi> <mn>1</mn> </msub> <msub> <mi>P</mi> <mn>1</mn> </msub> </mrow> <mrow> <mn>1000</mn> <mi>&eta;</mi> <mo>&times;</mo> <mn>3600</mn> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>10</mn> <mo>)</mo> </mrow> </mrow>Wherein：Dj' represent original system jth heater extraction flow；DjRepresent the jth heater extraction flow of existing system；ΔDn Represent low pressure (LP) cylinder exhaust steam flow changing value；qnRepresent low pressure (LP) cylinder steam discharge enthalpy；Extraction flow is smaller, and steam turbine acting ability is got over Greatly；Δ N represents air-introduced machine power increment value；Q1And Q2The front and rear air-introduced machine flue gas flow of transformation is represented respectively；P1And P2Table respectively Show the front and rear air-introduced machine inlet flue gas pressure of transformation；η represents fan efficiency, takes about definite value.
- 5. a kind of low-pressure coal saver Evaluation on Energy Saving method for being series at power plant therrmodynamic system as claimed in claim 4, it is special Sign is, the heat balance diagram parameter, includes heater extraction flows at different levels, the temperature and pressure of power plant therrmodynamic system.
- 6. a kind of low-pressure coal saver Evaluation on Energy Saving method for being series at power plant therrmodynamic system as claimed in claim 4, it is special Sign is, the heat balance diagram parameter, includes heater condensing water flow, temperature and the pressures at different levels of power plant therrmodynamic system Power, and heater condensate flow at different levels, temperature and pressure.
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