CN105184087A - Method and device for calculating influences of changes of environment temperature on coal consumption of coal-fired power generation unit - Google Patents

Abstract

The invention provides a method and device for calculating influences of changes of the environment temperature on coal consumption of a coal-fired power generation unit. The method includes the steps of obtaining the temperature of air at an inlet of an air pre-heater and the temperature of smoke at the inlet of the air pre-heater at the set environment temperature T, and calculating the temperature (please see the specification) of furnace exhaust smoke according to the temperature of the air at the inlet of the air pre-heater and the temperature of the smoke at the inlet of the air pre-heater; calculating the change amount deltaq<2> of heat losses of the furnace exhaust smoke according to the temperature (please see the specification) of the furnace exhaust smoke; obtaining the backpressure based on the influences of the environment temperature on the backpressure; finding a turbine backpressure correction curve according to the backpressure, and obtaining a difference value deltaH<R> between practical heat losses H<R> at the backpressure and design heat losses H<RTHA>; calculating the total quantity deltab of the influences of the environment temperature on the coal consumption of the unit according to the change amount deltaq<2> of the heat losses of the furnace exhaust smoke and the difference value deltaH<R>. By means of the method and device, the influences of the changes of the environment temperature on the coal consumption of the coal-fired power generation unit can be quantitatively calculated, the external condition deviation can be accurately calculated, and then the final energy efficiency level of the power generation unit can be researched.

Description

The computing method that variation of ambient temperature affects Thermal generation unit coal consumption and device

Technical field

The present invention relates to Thermal generation unit coal consumption analytical technology, particularly relate to computing method and device that a kind of variation of ambient temperature affects Thermal generation unit coal consumption.

Background technology

Along with the demand of society to electric power is more and more higher, the generating efficiency how improving genset becomes the problem of current people concern.

For a genset determined, the efficiency level that it finally can reach depends on the factor of three aspects, that is: the Design and manufacture level of this genset; The application conditions of this generator unit; Supvr is to the management application level of genset.The management application level of supvr to genset is the subjective factor of unit operation, can be improved by the improvement of operational management.The Design and manufacture level of genset, and the application conditions of generator unit is the objective factor of unit operation.

Based on the factor of above-mentioned three aspects, in prior art, define following relevant to economy value:

(a) desired value or optimal value: based on identical steam design parameter design peak performance value can be ideal value or optimal value, optimal value represent same type units design the best, and management level high its performance to best;

(b) design load: the efficiency level of certain unit design to be evaluated;

(c) actual value: certain the actual efficiency level reached of unit to be evaluated;

D () should reach value: refer to that unit is in actual motion, under a certain objective condition (as temperature, circulating water temperature etc. can not under people's objective condition for a change) and a certain operating mode (as rate of load condensate), a certain heat supply generating is than running the optimum value that should reach in theory under condition under Optimum operating control mode.

Value should be reached with Energy design value for benchmark, be determined by the impact of remover apparatus aberrations in property and objective condition deviation.Equipment performance deviation refer to unit performance under design conditions with the difference of design load, comprehensively embody the design of equipment, manufacture and installation level, if not facilities and equipments transformation, just can not change equipment performance deviation.Objective condition deviation refers to objective condition residing for unit operation and the inconsistent deviation caused of design conditions, the service condition that so-called objective condition and the geographic position residing for unit, meteorological condition, network load restriction etc. are not affected by human factors.The efficiency deviate that design load deduction equipment performance deviation and objective condition deviation cause is this unit and should reaches value, that is:

Value=design load ± equipment performance deviation ± external condition deviation should be reached

External condition deviation effects mainly considers the factor of three aspects: the unit efficiency deviation that actual conventional ature of coal off-design ature of coal causes, the unit efficiency deviation that actual environment temperature departure design environment temperature causes, and actual the exerting oneself of unit departs from the efficiency deviation that nominal output causes, external condition deviation namely this three parts efficiency deviation add and.

Visible, the unit efficiency deviation that actual environment temperature departure design environment temperature causes is as one of the principal element of external condition deviation, larger on the impact of generating efficiency, in order to study the efficiency level that genset finally can reach, the unit efficiency deviation that actual environment temperature departure design environment temperature causes just must be considered.In the prior art, also there is not analytical technology Thermal generation unit coal consumption affected about variation of ambient temperature.

Summary of the invention

The computing method that the embodiment of the present invention provides a kind of variation of ambient temperature to affect Thermal generation unit coal consumption and device, with quantitative computing environment temperature variation on the impact of Thermal generation unit coal consumption, accurate calculating external condition deviation, and then the efficiency level that research genset finally can reach.

To achieve these goals, embodiments provide the computing method that a kind of variation of ambient temperature affects Thermal generation unit coal consumption, described computing method comprise:

Under set environment temperature T, obtain air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature, and calculate exhaust gas temperature according to described air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature

According to described exhaust gas temperature calculate the variation delta q of boiler exhaust gas thermal loss ₂;

Turbine back pressure is obtained based on the impact of environment temperature on back pressure;

Search LP Turbine Exhaust Pressure Correction Curves according to described turbine back pressure, obtain the actual hear rate H under described turbine back pressure _rwith design hear rate H _rTHAdifference DELTA H _r;

According to the variation delta q of boiler exhaust gas thermal loss ₂and described difference DELTA H _rcomputing environment temperature affects total amount Δ b to unit coal consumption.

In one embodiment, calculate exhaust gas temperature according to described air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature comprise:

Bring described air preheater entering air temperature and air preheater entrance flue gas temperature into following formula, calculate described exhaust gas temperature

${\mathrm{\&theta;}}_{Lv}^T=\frac{T({\mathrm{\&theta;}}_{En}-{\mathrm{\&theta;}}_{Lv})+{\mathrm{\&theta;}}_{En}({\mathrm{\&theta;}}_{Lv}-t_{En})}{({\mathrm{\&theta;}}_{En}-t_{En})}$

Wherein, θ _enfor air preheater entrance flue gas temperature, θ _lvfor air preheater exit gas temperature, t _enair preheater entering air temperature.

In one embodiment, according to described exhaust gas temperature calculate the variation delta q of boiler exhaust gas thermal loss ₂, comprising:

By described exhaust gas temperature bring following formula into, calculate the variation delta q of described boiler exhaust gas thermal loss ₂:

${\mathrm{\&Delta;q}}_2=q_2\frac{({\mathrm{\&theta;}}_{Lv}-t_{En})-({\mathrm{\&theta;}}_{Lv}^T-T)}{{\mathrm{\&theta;}}_{Lv}^T-T}$

Wherein, q ₂for the boiler exhaust gas thermal loss design load under described set environment temperature T.

In one embodiment, when described steam turbine is Air-cooled Unit, obtains turbine back pressure based on the impact of environment temperature on back pressure, comprising: environmentally temperature is to the influence curve of back pressure, obtain the turbine back pressure under current environmental temperature.

In one embodiment, when described steam turbine is wet type cooling unit, obtains turbine back pressure based on the impact of environment temperature on back pressure, comprising:

The condenser outlet temperature difference is calculated according to the design data under load condition;

According to Inlet Temperature of Circulating Water and described differential thermal calculation actual exhaust air temperature;

According to described actual exhaust air temperature lookup water vapor pressure property list, obtain the turbine back pressure that described actual exhaust air temperature is corresponding.

In one embodiment, calculate the condenser outlet temperature difference according to the design data under load condition, comprising:

Search water vapor pressure property list according to setting back pressure value, obtain the exhaust temperature under described setting back pressure value and condenser inflow temperature;

The described condenser outlet temperature difference is calculated according to described exhaust temperature and condenser inflow temperature.

In one embodiment, according to the variation delta q of boiler exhaust gas thermal loss ₂and described difference DELTA H _rcomputing environment temperature affects total amount Δ b to unit coal consumption, comprising:

By the described variation delta q according to boiler exhaust gas thermal loss ₂and described difference DELTA H _rbring following formula into, computing environment temperature affects total amount Δ b to unit coal consumption:

$\mathrm{\&Delta;}b=\frac{{\mathrm{\&Delta;q}}_2}{{\mathrm{\&eta;}}_B}{b}_{st}+\frac{{\mathrm{\&Delta;H}}_R}{H_{RD}}{b}_{st};$

Wherein, b _stfor unit design coal consumption, g/kWh; η _bfor the boiler efficiency at design environment temperature, %; H _rDfor the thermal loss of steam turbine at design environment temperature, kJ/kWh.

To achieve these goals, embodiments provide the calculation element that a kind of variation of ambient temperature affects Thermal generation unit coal consumption, described calculation element comprises:

Exhaust gas temperature computing unit, under set environment temperature T, obtains air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature, and calculates exhaust gas temperature according to described air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature

Variable quantity computing unit, for according to described exhaust gas temperature calculate the variation delta q of boiler exhaust gas thermal loss ₂;

Back pressure generation unit, for obtaining turbine back pressure based on the impact of environment temperature on back pressure;

Hear rate differential value generation unit, for searching LP Turbine Exhaust Pressure Correction Curves according to described turbine back pressure, obtains the actual hear rate H under described turbine back pressure _rwith design hear rate H _rTHAdifference DELTA H _r;

Coal consumption affects computing unit, for the variation delta q according to boiler exhaust gas thermal loss ₂and described difference DELTA H _rcomputing environment temperature affects total amount Δ b to unit coal consumption.

In one embodiment, described exhaust gas temperature computing unit specifically for: bring described air preheater entering air temperature and air preheater entrance flue gas temperature into following formula, calculate described exhaust gas temperature

${\mathrm{\&theta;}}_{Lv}^T=\frac{T({\mathrm{\&theta;}}_{En}-{\mathrm{\&theta;}}_{Lv})+{\mathrm{\&theta;}}_{En}({\mathrm{\&theta;}}_{Lv}-t_{En})}{({\mathrm{\&theta;}}_{En}-t_{En})}$

Wherein, θ _enfor air preheater entrance flue gas temperature, θ _lvfor air preheater exit gas temperature, t _enair preheater entering air temperature.

In one embodiment, described variable quantity computing unit specifically for: by described exhaust gas temperature bring following formula into, calculate the variation delta q of described boiler exhaust gas thermal loss ₂:

${\mathrm{\&Delta;q}}_2=q_2\frac{({\mathrm{\&theta;}}_{Lv}-t_{En})-({\mathrm{\&theta;}}_{Lv}^T-T)}{{\mathrm{\&theta;}}_{Lv}^T-T}$

Wherein, q ₂for the boiler exhaust gas thermal loss design load under described set environment temperature T.

In one embodiment, when described steam turbine is Air-cooled Unit, described back pressure generation unit is used for environmentally temperature and, to the influence curve of back pressure, obtains the turbine back pressure under current environmental temperature.

In one embodiment, when described steam turbine is wet type cooling unit, described back pressure generation unit comprises:

Differential thermal calculation module, for calculating the condenser outlet temperature difference according to the design data under load condition;

Delivery temperature calculates module, for according to Inlet Temperature of Circulating Water and described differential thermal calculation actual exhaust air temperature;

Back pressure generation module, for according to described actual exhaust air temperature lookup water vapor pressure property list, obtains the turbine back pressure that described actual exhaust air temperature is corresponding.

In one embodiment, described differential thermal calculation module specifically for: search water vapor pressure property list according to setting back pressure value, obtain the exhaust temperature under described setting back pressure value and condenser inflow temperature; The described condenser outlet temperature difference is calculated according to described exhaust temperature and condenser inflow temperature.

In one embodiment, described coal consumption affect computing unit specifically for: by the described variation delta q according to boiler exhaust gas thermal loss ₂and described difference DELTA H _rbring following formula into, computing environment temperature affects total amount Δ b to unit coal consumption:

$\mathrm{\&Delta;}b=\frac{{\mathrm{\&Delta;q}}_2}{{\mathrm{\&eta;}}_B}{b}_{st}+\frac{{\mathrm{\&Delta;H}}_R}{H_{RD}}{b}_{st};$

Wherein, b _stfor unit design coal consumption, g/kWh; η _bfor the boiler efficiency at design environment temperature, %; H _rDfor the thermal loss of steam turbine at design environment temperature, kJ/kWh.

The beneficial effect of the embodiment of the present invention is, utilizes the present invention, quantitatively computing environment temperature variation on the impact of Thermal generation unit coal consumption, accurately can calculate external condition deviation, and then the efficiency level that research genset finally can reach.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the computing method process flow diagram that embodiment of the present invention variation of ambient temperature affects Thermal generation unit coal consumption;

Fig. 2 is the influence curve schematic diagram of embodiment of the present invention environment temperature to back pressure;

Fig. 3 is that the embodiment of the present invention obtains the method flow diagram of turbine back pressure based on the impact of environment temperature on back pressure;

Fig. 4 is typical unit back pressuce fair curve schematic diagram;

Fig. 5 is the structured flowchart of embodiment of the present invention variation of ambient temperature on the calculation element that Thermal generation unit coal consumption affects;

Fig. 6 is the structured flowchart of the back pressure generation unit 503 of the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Embodiments provide the computing method that a kind of variation of ambient temperature affects Thermal generation unit coal consumption, as shown in Figure 1, these computing method comprise the steps:

S101: under set environment temperature T, obtains air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature, and calculates exhaust gas temperature according to described air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature

S103: according to described exhaust gas temperature calculate the variation delta q of boiler exhaust gas thermal loss ₂;

S103: obtain turbine back pressure based on the impact of environment temperature on back pressure;

S104: search LP Turbine Exhaust Pressure Correction Curves according to described turbine back pressure, obtains the actual hear rate H under described turbine back pressure _rwith design hear rate H _rTHAdifference DELTA H _r;

S105: according to the variation delta q of boiler exhaust gas thermal loss ₂and described difference DELTA H _rcomputing environment temperature affects total amount Δ b to unit coal consumption.

Flow process is as shown in Figure 1 known, needs to consider the impact of variation of ambient temperature on boiler efficiency and turbine efficiency during variation of ambient temperature simultaneously.First the present invention calculates variable quantity and the thermal loss of steam turbine difference of boiler exhaust gas thermal loss, then according to the variable quantity of boiler exhaust gas thermal loss and thermal loss of steam turbine mathematic interpolation environment temperature total amount is affected on unit coal consumption, by the method, computing environment temperature variation that can be quantitative is on the impact of Thermal generation unit coal consumption.

The affect major embodiment of variation of ambient temperature on boiler efficiency is its impact on boiler exhaust gas thermal loss.Want computing environment temperature variation on the impact of heat loss due to exhaust gas, first need, according to air preheater entering air temperature and air preheater entrance flue gas temperature, to carry out exhaust gas temperature during computing environment temperature T specific formula for calculation is as follows:

${\mathrm{\&theta;}}_{Lv}^T=\frac{T({\mathrm{\&theta;}}_{En}-{\mathrm{\&theta;}}_{Lv})+{\mathrm{\&theta;}}_{En}({\mathrm{\&theta;}}_{Lv}-t_{En})}{({\mathrm{\&theta;}}_{En}-t_{En})}---\left(1\right)$

Bring the parameters such as air preheater entering air temperature and air preheater entrance flue gas temperature into above-mentioned formula (1), just can calculate exhaust gas temperature

In formula (1), θ _enfor air preheater entrance flue gas temperature, θ _lvfor air preheater exit gas temperature, t _enair preheater entering air temperature.

In the invention process, assumptions' environment temperature T is 25 DEG C, formula (1) will be converted into following formula:

${\mathrm{\&theta;}}_{Lv}^{25}=\frac{25({\mathrm{\&theta;}}_{En}-{\mathrm{\&theta;}}_{Lv})+{\mathrm{\&theta;}}_{En}({\mathrm{\&theta;}}_{Lv}-t_{En})}{({\mathrm{\&theta;}}_{En}-t_{En})}---\left(2\right)$

Utilize exhaust gas temperature during T the variation delta q of boiler exhaust gas thermal loss can be calculated ₂, particularly, by exhaust gas temperature bring following formula into, calculate the variation delta q of described boiler exhaust gas thermal loss ₂:

${\mathrm{\&Delta;q}}_2=q_2\frac{({\mathrm{\&theta;}}_{Lv}-t_{En})-({\mathrm{\&theta;}}_{Lv}^T-T)}{{\mathrm{\&theta;}}_{Lv}^T-T}---\left(3\right)$

In formula (3), q ₂for the boiler exhaust gas thermal loss design load under set environment temperature T.

Steam turbine is divided into wet type cooling unit and Air-cooled Unit, in step S103, obtains the method for turbine back pressure based on the impact of environment temperature on back pressure, wet type cooling unit and Air-cooled Unit different, need to calculate respectively.

For Air-cooled Unit, step S103 can directly environmentally temperature be to the influence curve of back pressure, and obtain the turbine back pressure under current environmental temperature, environment temperature to the influence curve of back pressure as shown in Figure 2.

For wet type cooling unit, also should based on the influence curve of environment temperature to back pressure.This curve needs according to based on producer's design parameter, carries out Correlation method for data processing and obtains.As shown in Figure 3, when step S103 specifically implements, comprise the steps:

S301: calculate the condenser outlet temperature difference according to the design data under load condition.

Particularly, need to search water vapor pressure property list according to setting back pressure value, obtain the exhaust temperature under described setting back pressure value and condenser inflow temperature; Then the described condenser outlet temperature difference is calculated according to described exhaust temperature and condenser inflow temperature.

Illustrate, if certain unit design back pressure is 5.88kPa, the exhaust temperature under inquiry water vapor pressure property list this back pressure known is 31.8 DEG C, and under design conditions, condenser inflow temperature is 24 DEG C, and so the condenser outlet temperature difference is 7.8 DEG C.This temperature difference is the required temperature difference ensureing heat-transfer temperature difference of condensor, can change with the size of circulating water flow, but under the constant condition of condenser heating surface, large degree of convergence reduces this temperature difference can pay higher cost, therefore think in calculating that the condenser outlet temperature difference is design load, remain unchanged.

S302: according to Inlet Temperature of Circulating Water and described differential thermal calculation actual exhaust air temperature.Actual exhaust air temperature is that actual cycle water temperature and condenser export temperature difference sum.

S303: according to described actual exhaust air temperature lookup water vapor pressure property list, obtain the turbine back pressure that described actual exhaust air temperature is corresponding.

For S104, every platform unit all needs oneself back pressure fair curve, and typical unit back pressuce fair curve is illustrated in fig. 4 shown below.

In S105, need to affect total amount Δ b according to following formulae discovery environment temperature to unit coal consumption.

$\mathrm{\&Delta;}b=\frac{{\mathrm{\&Delta;q}}_2}{{\mathrm{\&eta;}}_B}{b}_{st}+\frac{{\mathrm{\&Delta;H}}_R}{H_{RD}}{b}_{st}---\left(4\right)$

Particularly, need the variation delta q of boiler exhaust gas thermal loss ₂and difference DELTA H _rbring formula (4) into, computing environment temperature affects total amount Δ b to unit coal consumption.

In formula (4), b _stfor unit design coal consumption, g/kWh; η _bfor the boiler efficiency at design environment temperature, %; H _rDfor the thermal loss of steam turbine at design environment temperature, kJ/kWh.

Utilize the present invention, quantitatively computing environment temperature variation on the impact of Thermal generation unit coal consumption, accurately can calculate external condition deviation, and then the efficiency level that research genset finally can reach.

Based on the inventive concept that the computing method affected Thermal generation unit coal consumption with the variation of ambient temperature shown in Fig. 1 are identical, the embodiment of the present application additionally provides the calculation element that a kind of variation of ambient temperature affects Thermal generation unit coal consumption, as below as described in embodiment.The principle of dealing with problems on the calculation element that Thermal generation unit coal consumption affects due to this variation of ambient temperature is similar to the computing method that variation of ambient temperature affects Thermal generation unit coal consumption, therefore this variation of ambient temperature see the enforcement of variation of ambient temperature on the computing method that Thermal generation unit coal consumption affects, can repeat part and repeats no more the enforcement of the calculation element that Thermal generation unit coal consumption affects.

As shown in Figure 5, the calculation element that a kind of variation of ambient temperature of the embodiment of the present invention affects Thermal generation unit coal consumption, this variation of ambient temperature comprises the calculation element that Thermal generation unit coal consumption affects: exhaust gas temperature computing unit 501, variable quantity computing unit 502, back pressure generation unit 503, hear rate differential value generation unit 504 and coal consumption affect computing unit 505.

Exhaust gas temperature computing unit 501 is under set environment temperature T, obtain air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature, and calculate exhaust gas temperature according to described air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature

Variable quantity computing unit 502 is for according to described exhaust gas temperature calculate the variation delta q of boiler exhaust gas thermal loss ₂.

Back pressure generation unit 503 is for obtaining turbine back pressure based on the impact of environment temperature on back pressure.

Hear rate differential value generation unit 504, for searching LP Turbine Exhaust Pressure Correction Curves according to described turbine back pressure, obtains the actual hear rate H under described turbine back pressure _rwith design hear rate H _rTHAdifference DELTA H _r.

Coal consumption affects computing unit 505 for the variation delta q according to boiler exhaust gas thermal loss ₂and described difference DELTA H _rcomputing environment temperature affects total amount Δ b to unit coal consumption.

In one embodiment, exhaust gas temperature computing unit 501 specifically for: bring described air preheater entering air temperature and air preheater entrance flue gas temperature into following formula, calculate described exhaust gas temperature

${\mathrm{\&theta;}}_{Lv}^T=\frac{T({\mathrm{\&theta;}}_{En}-{\mathrm{\&theta;}}_{Lv})+{\mathrm{\&theta;}}_{En}({\mathrm{\&theta;}}_{Lv}-t_{En})}{({\mathrm{\&theta;}}_{En}-t_{En})}$

Wherein, θ _enfor air preheater entrance flue gas temperature, θ _lvfor air preheater exit gas temperature, t _enair preheater entering air temperature.

In one embodiment, variable quantity computing unit 502 specifically for: by described exhaust gas temperature bring following formula into, calculate the variation delta q of described boiler exhaust gas thermal loss ₂:

${\mathrm{\&Delta;q}}_2=q_2\frac{({\mathrm{\&theta;}}_{Lv}-t_{En})-({\mathrm{\&theta;}}_{Lv}^T-T)}{{\mathrm{\&theta;}}_{Lv}^T-T}$

Wherein, q ₂for the boiler exhaust gas thermal loss design load under described set environment temperature T.

In one embodiment, when steam turbine is Air-cooled Unit, back pressure generation unit 503 to the influence curve of back pressure, obtains the turbine back pressure under current environmental temperature for environmentally temperature.

In one embodiment, as shown in Figure 6, when described steam turbine is wet type cooling unit, back pressure generation unit 503 comprises: differential thermal calculation module 601, and delivery temperature calculates module 602 and back pressure generation module 603.

Differential thermal calculation module 601 is for calculating the condenser outlet temperature difference according to the design data under load condition;

Delivery temperature calculates module 602 for according to Inlet Temperature of Circulating Water and described differential thermal calculation actual exhaust air temperature;

Back pressure generation module 603, for according to described actual exhaust air temperature lookup water vapor pressure property list, obtains the turbine back pressure that described actual exhaust air temperature is corresponding.

In one embodiment, differential thermal calculation module 601 specifically for: search water vapor pressure property list according to setting back pressure value, obtain the exhaust temperature under described setting back pressure value and condenser inflow temperature; The described condenser outlet temperature difference is calculated according to described exhaust temperature and condenser inflow temperature.

In one embodiment, coal consumption affect computing unit 503 specifically for: by the described variation delta q according to boiler exhaust gas thermal loss ₂and described difference DELTA H _rbring following formula into, computing environment temperature affects total amount Δ b to unit coal consumption:

$\mathrm{\&Delta;}b=\frac{{\mathrm{\&Delta;q}}_2}{{\mathrm{\&eta;}}_B}{b}_{st}+\frac{{\mathrm{\&Delta;H}}_R}{H_{RD}}{b}_{st};$

Wherein, b _stfor unit design coal consumption, g/kWh; η _bfor the boiler efficiency at design environment temperature, %; H _rDfor the thermal loss of steam turbine at design environment temperature, kJ/kWh.

Utilize the present invention, quantitatively computing environment temperature variation on the impact of Thermal generation unit coal consumption, accurately can calculate external condition deviation, and then the efficiency level that research genset finally can reach.

Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.

The present invention describes with reference to according to the process flow diagram of the method for the embodiment of the present invention, equipment (system) and computer program and/or block scheme.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block scheme and/or square frame and process flow diagram and/or block scheme and/or square frame.These computer program instructions can being provided to the processor of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computing machine or other programmable data processing device produce device for realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.

These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.

Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (14)

1. variation of ambient temperature computing method that Thermal generation unit coal consumption is affected, it is characterized in that, described computing method comprise:

Under set environment temperature T, obtain air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature, and calculate exhaust gas temperature according to described air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature

According to described exhaust gas temperature calculate the variation delta q of boiler exhaust gas thermal loss ₂;

Turbine back pressure is obtained based on the impact of environment temperature on back pressure;

Search LP Turbine Exhaust Pressure Correction Curves according to described turbine back pressure, obtain the actual hear rate H under described turbine back pressure _rwith design hear rate H _rTHAdifference DELTA H _r;

According to the variation delta q of boiler exhaust gas thermal loss ₂and described difference DELTA H _rcomputing environment temperature affects total amount Δ b to unit coal consumption.

2. the computing method that affect Thermal generation unit coal consumption of variation of ambient temperature according to claim 1, is characterized in that, calculate exhaust gas temperature according to described air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature comprise:

Bring described air preheater entering air temperature and air preheater entrance flue gas temperature into following formula, calculate described exhaust gas temperature

${\mathrm{\&theta;}}_{Lv}^T=\frac{T({\mathrm{\&theta;}}_{En}-{\mathrm{\&theta;}}_{Lv})+{\mathrm{\&theta;}}_{En}({\mathrm{\&theta;}}_{Lv}-t_{En})}{({\mathrm{\&theta;}}_{En}-t_{En})}$

Wherein, θ _enfor air preheater entrance flue gas temperature, θ _lvfor air preheater exit gas temperature, t _enair preheater entering air temperature.

3. the computing method that affect Thermal generation unit coal consumption of variation of ambient temperature according to claim 2, is characterized in that, according to described exhaust gas temperature calculate the variation delta q of boiler exhaust gas thermal loss ₂, comprising:

By described exhaust gas temperature bring following formula into, calculate the variation delta q of described boiler exhaust gas thermal loss ₂:

${\mathrm{\&Delta;q}}_2=q_2\frac{({\mathrm{\&theta;}}_{Lv}-t_{En})-({\mathrm{\&theta;}}_{Lv}^T-T)}{{\mathrm{\&theta;}}_{Lv}^T-T}$

Wherein, q ₂for the boiler exhaust gas thermal loss design load under described set environment temperature T.

4. variation of ambient temperature according to claim 3 computing method that Thermal generation unit coal consumption is affected, it is characterized in that, when described steam turbine is Air-cooled Unit, turbine back pressure is obtained based on the impact of environment temperature on back pressure, comprise: environmentally temperature is to the influence curve of back pressure, obtain the turbine back pressure under current environmental temperature.

5. the computing method that affect Thermal generation unit coal consumption of variation of ambient temperature according to claim 3, is characterized in that, when described steam turbine is wet type cooling unit, obtains turbine back pressure, comprising based on the impact of environment temperature on back pressure:

The condenser outlet temperature difference is calculated according to the design data under load condition;

According to Inlet Temperature of Circulating Water and described differential thermal calculation actual exhaust air temperature;

According to described actual exhaust air temperature lookup water vapor pressure property list, obtain the turbine back pressure that described actual exhaust air temperature is corresponding.

6. the computing method that affect Thermal generation unit coal consumption of variation of ambient temperature according to claim 5, is characterized in that, calculate the condenser outlet temperature difference, comprising according to the design data under load condition:

Search water vapor pressure property list according to setting back pressure value, obtain the exhaust temperature under described setting back pressure value and condenser inflow temperature;

The described condenser outlet temperature difference is calculated according to described exhaust temperature and condenser inflow temperature.

7. the computing method that affect Thermal generation unit coal consumption of variation of ambient temperature according to claim 1, is characterized in that, according to the variation delta q of boiler exhaust gas thermal loss ₂and described difference DELTA H _rcomputing environment temperature affects total amount Δ b to unit coal consumption, comprising:

By the described variation delta q according to boiler exhaust gas thermal loss ₂and described difference DELTA H _rbring following formula into, computing environment temperature affects total amount Δ b to unit coal consumption:

$\mathrm{\&Delta;}b=\frac{{\mathrm{\&Delta;q}}_2}{{\mathrm{\&eta;}}_B}{b}_{st}+\frac{{\mathrm{\&Delta;H}}_R}{H_{RD}}{b}_{st};$

Wherein, b _stfor unit design coal consumption, g/kWh; η _bfor the boiler efficiency at design environment temperature, %; H _rDfor the thermal loss of steam turbine at design environment temperature, kJ/kWh.

8. a variation of ambient temperature calculation element that Thermal generation unit coal consumption is affected, it is characterized in that, described calculation element comprises:

Exhaust gas temperature computing unit, under set environment temperature T, obtains air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature, and calculates exhaust gas temperature according to described air preheater entrance wind-warm syndrome and air preheater entrance flue gas temperature

Variable quantity computing unit, for according to described exhaust gas temperature calculate the variation delta q of boiler exhaust gas thermal loss ₂;

Back pressure generation unit, for obtaining turbine back pressure based on the impact of environment temperature on back pressure;

Hear rate differential value generation unit, for searching LP Turbine Exhaust Pressure Correction Curves according to described turbine back pressure, obtains the actual hear rate H under described turbine back pressure _rwith design hear rate H _rTHAdifference DELTA H _r;

Coal consumption affects computing unit, for the variation delta q according to boiler exhaust gas thermal loss ₂and described difference DELTA H _rcomputing environment temperature affects total amount Δ b to unit coal consumption.

9. variation of ambient temperature according to claim 8 calculation element that Thermal generation unit coal consumption is affected, it is characterized in that, described exhaust gas temperature computing unit specifically for: bring described air preheater entering air temperature and air preheater entrance flue gas temperature into following formula, calculate described exhaust gas temperature

${\mathrm{\&theta;}}_{Lv}^T=\frac{T({\mathrm{\&theta;}}_{En}-{\mathrm{\&theta;}}_{Lv})+{\mathrm{\&theta;}}_{En}({\mathrm{\&theta;}}_{Lv}-t_{En})}{({\mathrm{\&theta;}}_{En}-t_{En})}$

Wherein, θ _enfor air preheater entrance flue gas temperature, θ _lvfor air preheater exit gas temperature, t _enair preheater entering air temperature.

10. the calculation element that affects Thermal generation unit coal consumption of variation of ambient temperature according to claim 9, is characterized in that, described variable quantity computing unit specifically for: by described exhaust gas temperature bring following formula into, calculate the variation delta q of described boiler exhaust gas thermal loss ₂:

${\mathrm{\&Delta;q}}_2=q_2\frac{({\mathrm{\&theta;}}_{Lv}-t_{En})-({\mathrm{\&theta;}}_{Lv}^T-T)}{{\mathrm{\&theta;}}_{Lv}^T-T}$

Wherein, q ₂for the boiler exhaust gas thermal loss design load under described set environment temperature T.

The calculation element that 11. variation of ambient temperature according to claim 10 affect Thermal generation unit coal consumption, it is characterized in that, when described steam turbine is Air-cooled Unit, described back pressure generation unit is used for environmentally temperature and, to the influence curve of back pressure, obtains the turbine back pressure under current environmental temperature.

The calculation element that 12. variation of ambient temperature according to claim 10 affect Thermal generation unit coal consumption, is characterized in that, when described steam turbine is wet type cooling unit, described back pressure generation unit comprises:

Differential thermal calculation module, for calculating the condenser outlet temperature difference according to the design data under load condition;

Delivery temperature calculates module, for according to Inlet Temperature of Circulating Water and described differential thermal calculation actual exhaust air temperature;

Back pressure generation module, for according to described actual exhaust air temperature lookup water vapor pressure property list, obtains the turbine back pressure that described actual exhaust air temperature is corresponding.

The calculation element that 13. variation of ambient temperature according to claim 12 affect Thermal generation unit coal consumption, it is characterized in that, described differential thermal calculation module specifically for: search water vapor pressure property list according to setting back pressure value, obtain the exhaust temperature under described setting back pressure value and condenser inflow temperature; The described condenser outlet temperature difference is calculated according to described exhaust temperature and condenser inflow temperature.

The calculation element that 14. variation of ambient temperature according to claim 8 affect Thermal generation unit coal consumption, is characterized in that, described coal consumption affect computing unit specifically for: by the described variation delta q according to boiler exhaust gas thermal loss ₂and described difference DELTA H _rbring following formula into, computing environment temperature affects total amount Δ b to unit coal consumption:

$\mathrm{\&Delta;}b=\frac{{\mathrm{\&Delta;q}}_2}{{\mathrm{\&eta;}}_B}{b}_{st}+\frac{{\mathrm{\&Delta;H}}_R}{H_{RD}}{b}_{st};$

Wherein, b _stfor unit design coal consumption, g/kWh; η _bfor the boiler efficiency at design environment temperature, %; H _rDfor the thermal loss of steam turbine at design environment temperature, kJ/kWh.