CN105224817A

CN105224817A - The defining method of unit generation efficiency

Info

Publication number: CN105224817A
Application number: CN201510755941.0A
Authority: CN
Inventors: 赵振宁; 张清峰; 李媛园; 李金晶
Original assignee: State Grid Corp of China SGCC; North China Electric Power Research Institute Co Ltd
Current assignee: State Grid Corp of China SGCC; North China Electric Power Research Institute Co Ltd
Priority date: 2015-11-09
Filing date: 2015-11-09
Publication date: 2016-01-06
Anticipated expiration: 2035-11-09
Also published as: CN105224817B

Abstract

The present invention provides a method for determining the power generation efficiency of a unit, the method comprising: obtaining the relevant heat information supplied to the boiler before the air preheater; obtaining the boiler efficiency according to the relevant heat information; The heat consumption of the unit is used to obtain the power generation efficiency of the unit. Thus, the boiler efficiency and power generation efficiency of the unit with external heat supply can be calculated simply and accurately.

Description

Determination method of generating unit generating efficiency

技术领域technical field

本发明涉及供热发电领域，尤指一种机组发电效率的确定方法。The invention relates to the field of heat supply and power generation, in particular to a method for determining the power generation efficiency of a unit.

背景技术Background technique

对于供热火电厂，除热损失外，锅炉产生的蒸汽一部分去汽轮机用于发电，另一部分用于供热。在现有技术的燃煤机组锅炉中，在对锅炉预热的热一次风12，热二次风13中，通常会从热一次风12中输入锅炉位置直接掺入冷风(不经过空预器)到热一次风管道以便使磨煤机入口温度保持在规定范围内，但该种方法会造成锅炉排烟14温度的升高，因此越来越多的电厂引进了锅炉热一次风加热技术，即在空预器前加装热一次风加热器11，利用热一次风12加热一部分来自机组回热系统的主凝结水15，回收热一次风的部分热量，以此控制进入磨煤机入口的热一次风温度，如图1所示。鉴于该技术应用越来越广泛，因此在保证精确性的前提下，针对空预器前有热量供给的机组，提出简化的锅炉效率和机组发电效率的计算公式是业内人员亟需解决的问题。For heating thermal power plants, in addition to heat loss, part of the steam generated by the boiler goes to the steam turbine for power generation, and the other part is used for heating. In the coal-fired unit boilers of the prior art, in the hot primary air 12 and hot secondary air 13 that are preheated to the boiler, cold air is usually directly mixed into the boiler position from the hot primary air 12 (without passing through the air preheater) ) to the hot primary air pipeline in order to keep the coal mill inlet temperature within the specified range, but this method will cause the temperature of boiler exhaust gas 14 to rise, so more and more power plants have introduced boiler hot primary air heating technology, That is to install a hot primary air heater 11 before the air preheater, use the hot primary air 12 to heat a part of the main condensate 15 from the heat recovery system of the unit, and recover part of the heat of the hot primary air, so as to control the amount of water entering the coal mill inlet The temperature of the hot primary air is shown in Figure 1. In view of the fact that this technology is more and more widely used, on the premise of ensuring the accuracy, it is an urgent problem for industry personnel to propose simplified calculation formulas for boiler efficiency and unit power generation efficiency for units with heat supply before the air preheater.

发明内容Contents of the invention

为达解决上述问题，本发明目的在于提供一种精确的机组发电效率及锅炉效率计算方法，为此，本发明具体提供了一种机组发电效率的确定方法，所述机组发电效率的确定方法具体包含：获取空气预热器前供给给锅炉的相关热量信息；根据所述相关热量信息获得所述锅炉效率；通过所述锅炉效率与汽机的热耗量获得机组发电效率。In order to solve the above problems, the purpose of the present invention is to provide an accurate calculation method for unit power generation efficiency and boiler efficiency. For this reason, the present invention specifically provides a method for determining the unit power generation efficiency. The method for determining the unit power generation efficiency is specifically It includes: obtaining the relevant heat information supplied to the boiler before the air preheater; obtaining the boiler efficiency according to the relevant heat information; obtaining the power generation efficiency of the unit through the boiler efficiency and the heat consumption of the steam turbine.

在上述机组发电效率的确定方法中，优选的，所述相关热量信息包含：机组的热量损失信息，锅炉给煤量信息，每千克燃料的低位发热量信息，锅炉供热量信息和/或低压省煤器的吸热量信息。In the method for determining the power generation efficiency of the above-mentioned unit, preferably, the relevant heat information includes: heat loss information of the unit, boiler coal feed information, low-level calorific value information per kilogram of fuel, boiler heat supply information and/or low pressure Heat absorption information for economizers.

在上述机组发电效率的确定方法中，优选的，所述根据所述相关热量信息获得所述锅炉效率包含：根据所述相关热量信息，通过以下公式获得所述锅炉效率；In the method for determining the power generation efficiency of the above-mentioned unit, preferably, the obtaining the boiler efficiency according to the relevant heat information includes: obtaining the boiler efficiency according to the relevant heat information through the following formula;

${η η}_{B B} = = 100100 - - \frac{{ΣL ΣL}_{i i}}{{Q Q}_{a a r r,, n no e e t t}} - - \frac{{ΣQ ΣQ}_{j j}}{10001000 {B B}_{r r} \cdot \cdot {Q Q}_{a a r r,, n no e e t t}};;$

其中，Q_ar,net为每千克燃料的低位发热量，kJ/kg；∑Q_j为锅炉直接供热量或锅炉沿烟气流程安装在空预热器前面的低压省煤器的吸热量，kJ/h；B_r为锅炉给煤量，t/h；∑L_i为机组的热量损失，kJ/kg。Among them, Q _ar,net is the low calorific value per kilogram of fuel, kJ/kg; ∑Q _j is the direct heat supply of the boiler or the heat absorption of the low-pressure economizer installed in front of the empty preheater along the flue gas flow of the boiler , kJ/h; B _r is the coal feed to the boiler, t/h; ∑L _i is the heat loss of the unit, kJ/kg.

在上述机组发电效率的确定方法中，优选的，所述低压省煤器的吸热量根据以下公式获得：∑Q_j＝Dc_mΔt；In the method for determining the power generation efficiency of the above-mentioned unit, preferably, the heat absorption of the low-pressure economizer is obtained according to the following formula: ∑Q _j =Dc _m Δt;

其中，D为工质流量，c_m为工质比热，Δt为工质温差。Among them, D is the flow rate of the working fluid, cm is the specific heat of the working fluid, and _Δt is the temperature difference of the working fluid.

在上述机组发电效率的确定方法中，优选的，所述机组的热量损失包含：排烟损失，可燃气体完全燃烧损失，固体未完全燃烧损失，锅炉散热损失，灰渣显热损失。In the method for determining the power generation efficiency of the above-mentioned unit, preferably, the heat loss of the unit includes: smoke exhaust loss, complete combustion loss of combustible gas, incomplete solid combustion loss, boiler heat dissipation loss, and ash sensible heat loss.

在上述机组发电效率的确定方法中，优选的，所述可燃气体完全燃烧损失和固体未完全燃烧损失由发热量及烟气、灰渣的量相乘获得。In the method for determining the power generation efficiency of the above unit, preferably, the complete combustion loss of the combustible gas and the incomplete combustion loss of the solid are obtained by multiplying the calorific value and the amount of flue gas and ash.

在上述机组发电效率的确定方法中，优选的，所述排烟损失和灰渣显热损失由比热容、温差及烟气、灰渣量相乘获得。In the method for determining the power generation efficiency of the above unit, preferably, the exhaust smoke loss and the ash sensible heat loss are obtained by multiplying the specific heat capacity, the temperature difference, and the amount of flue gas and ash.

在上述机组发电效率的确定方法中，优选的，所述通过所述锅炉效率与汽机的热耗量获得机组发电效率包含：根据所述锅炉效率与汽机的热耗量通过以下公式获得机组发电效率； $η = 3600 \times \frac{η_{B}}{H R};$ In the method for determining the power generation efficiency of the above-mentioned unit, preferably, the obtaining the power generation efficiency of the unit through the boiler efficiency and the heat consumption of the steam turbine includes: obtaining the power generation efficiency of the unit according to the boiler efficiency and the heat consumption of the steam turbine by the following formula ; $η = 3600 \times \frac{η_{B}}{h R};$

其中，为锅炉效率；3600为电的热当量，kJ/kW·h；HR为汽机的热耗量，kJ/kW·h。Among them, is the boiler efficiency; 3600 is the heat equivalent of electricity, kJ/kW h; HR is the heat consumption of the steam turbine, kJ/kW h.

在上述机组发电效率的确定方法中，优选的，所述汽机的热耗量通过以下公式获得； $H R = \frac{q_{m 1} \times h_{1} + q_{m 3} \times h_{3} - q_{m 11} \times h_{11} - q_{m 2} \times h_{2}}{P_{G}};$ In the method for determining the power generation efficiency of the above-mentioned unit, preferably, the heat consumption of the steam turbine is obtained by the following formula; $h R = \frac{q_{m 1} \times h_{1} + q_{m 3} \times h_{3} - q_{m 11} \times h_{11} - q_{m 2} \times h_{2}}{P_{G}};$

其中，q_m1、h₁为主汽流量，kg/h、焓，kJ/kg；q_m3、h₃为热再热汽流量，kg/h、焓，kJ/kg；q_m11、h₁₁为锅炉给水流量，kg/h、焓，kJ/kg；q_m2、h₂为再热冷端蒸汽流量，kg/h、焓，kJ/kg。Among them, q _m1 and h ₁ are the main steam flow rate, kg/h, _enthalpy , kJ/kg; q _m3 and h ₃ are hot reheat steam flow rate, kg/h, enthalpy, _kJ /kg; Boiler feed water flow, kg/h, enthalpy, kJ/kg; q _m2 and h ₂ are steam flow at reheating cold end, kg/h, enthalpy, kJ/kg.

在上述机组发电效率的确定方法中，优选的，当所述锅炉功率按传统反平衡算法计算获得，所述汽机的热耗量通过以下公式获得；In the method for determining the power generation efficiency of the above-mentioned unit, preferably, when the boiler power is calculated according to the traditional inverse balance algorithm, the heat consumption of the steam turbine is obtained by the following formula;

$H h R R = = \frac{{q q}_{m m 11} \times \times {h h}_{11} + + {q q}_{m m 33} \times \times {h h}_{33} - - {q q}_{m m 1111} \times \times {h h}_{1111} - - {q q}_{m m 22} \times \times {h h}_{22} + + {Q Q}_{j j}}{{P P}_{G G}};;$

通过本发明所提供的组发电效率的确定方法，即可简单精确的计算出有外供热量的机组的锅炉效率和机组发电效率。Through the method for determining the group power generation efficiency provided by the present invention, the boiler efficiency and the unit power generation efficiency of the unit with external heat supply can be calculated simply and accurately.

附图说明Description of drawings

此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，并不构成对本发明的限定。在附图中：The drawings described here are used to provide further understanding of the present invention, constitute a part of the application, and do not limit the present invention. In the attached picture:

图1为现有技术中空气预热器预加热示意图。Fig. 1 is a schematic diagram of preheating of an air preheater in the prior art.

图2为本发明所提供的机组发电效率的确定方法流程图。Fig. 2 is a flow chart of the method for determining the power generation efficiency of the unit provided by the present invention.

具体实施方式detailed description

为使本发明实施例的目的、技术方案和优点更加清楚明白，下面结合实施例和附图，对本发明做进一步详细说明。在此，本发明的示意性实施例及其说明用于解释本发明，但并不作为对本发明的限定。In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

本发明具体提供了一种机组发电效率的确定方法，请参考图2所示，所述机组发电效率的确定方法具体包含：S101获取空气预热器前供给给锅炉的相关热量信息；S102根据所述相关热量信息获得所述锅炉效率；S103通过所述锅炉效率与汽机的热耗量获得机组发电效率。The present invention specifically provides a method for determining the power generation efficiency of a unit. Please refer to FIG. Obtain the boiler efficiency based on the relevant heat information; S103 Obtain the power generation efficiency of the unit through the boiler efficiency and the heat consumption of the steam turbine.

在上述实施例中，所述相关热量信息包含：机组的热量损失信息，锅炉给煤量信息，每千克燃料的低位发热量信息，锅炉供热量信息和/或低压省煤器的吸热量信息。进一步的通过所述相关热量信息获得所述锅炉效率包含：根据所述相关热量信息，通过以下公式获得所述锅炉效率； $η_{B} = 100 - \frac{{ΣL}_{i}}{Q_{a r, n e t}} - \frac{{ΣQ}_{j}}{1000 B_{r} \cdot Q_{a r, n e t}};$ In the above embodiment, the relevant heat information includes: heat loss information of the unit, boiler coal feed information, low calorific value information per kilogram of fuel, boiler heat supply information and/or low-pressure economizer heat absorption information. Further obtaining the boiler efficiency by using the relevant heat information includes: obtaining the boiler efficiency by the following formula according to the relevant heat information; $η_{B} = 100 - \frac{{ΣL}_{i}}{Q_{a r, no e t}} - \frac{{ΣQ}_{j}}{1000 B_{r} &Center Dot; Q_{a r, no e t}};$

其中，所述低压省煤器的吸热量根据以下公式获得：∑Q_j＝Dc_mΔt；D为工质流量，c_m为工质比热，Δt为工质温差。Wherein, the heat absorption of the low-pressure economizer is obtained according to the following formula: ΣQ _j = Dc _m Δt; D is the flow rate of the working fluid, _cm is the specific heat of the working fluid, and Δt is the temperature difference of the working fluid.

通过上述公式，工作人员可根据时测数据，有效确定锅炉的效率，解决现有领域中空预器前有热量供给的机组时，锅炉效率无法准确获知的问题。Through the above formula, the staff can effectively determine the efficiency of the boiler according to the time measurement data, and solve the problem that the boiler efficiency cannot be accurately known when there is a heat supply unit in front of the air preheater in the existing field.

在上述实施例中，所述机组的热量损失包含：排烟损失，可燃气体完全燃烧损失，固体未完全燃烧损失，锅炉散热损失，灰渣显热损失。In the above embodiment, the heat loss of the unit includes: smoke exhaust loss, complete combustion loss of combustible gas, incomplete solid combustion loss, boiler heat dissipation loss, and ash sensible heat loss.

其中，所述可燃气体完全燃烧损失和固体未完全燃烧损失由发热量及烟气、灰渣的量相乘获得；所述排烟损失和灰渣显热损失由比热容、温差及烟气、灰渣量相乘获得。Among them, the complete combustion loss of the combustible gas and the incomplete combustion loss of the solid are obtained by multiplying the calorific value and the amount of flue gas and ash; The amount of slag is multiplied to obtain.

在上述实施例中，根据所述锅炉效率与汽机的热耗量通过以下公式获得机组发电效率； $η = 3600 \times \frac{η_{B}}{H R};$ In the above embodiment, according to the boiler efficiency and the heat consumption of the steam turbine, the power generation efficiency of the unit is obtained by the following formula; $η = 3600 \times \frac{η_{B}}{h R};$

在上述实施例中，本发明还提供汽机的热耗量计算方法，其中所述汽机的热耗量通过以下公式获得； $H R = \frac{q_{m 1} \times h_{1} + q_{m 3} \times h_{3} - q_{m 11} \times h_{11} - q_{m 2} \times h_{2}}{P_{G}};$ In the above embodiment, the present invention also provides a method for calculating the heat consumption of the steam turbine, wherein the heat consumption of the steam turbine is obtained by the following formula; $h R = \frac{q_{m 1} \times h_{1} + q_{m 3} \times h_{3} - q_{m 11} \times h_{11} - q_{m 2} \times h_{2}}{P_{G}};$

在上式中，q_m1、h₁为主汽流量，kg/h、焓，kJ/kg；q_m3、h₃为热再热汽流量，kg/h、焓，kJ/kg；q_m11、h₁₁为锅炉给水流量，kg/h、焓，kJ/kg；q_m2、h₂为再热冷端蒸汽流量，kg/h、焓，kJ/kg。In the above formula, q _m1 and h ₁ are the main steam flow rate, kg/h, enthalpy, kJ/kg; q _m3 and h ₃ are hot reheat steam flow rate, kg/h, _enthalpy , kJ/kg; h ₁₁ is boiler feed water flow rate, kg/h, enthalpy, kJ/kg; q _m2 and h ₂ are reheat cold end steam flow rate, kg/h, enthalpy, kJ/kg.

值得说明的是，当实际工作中，所述锅炉功率按传统反平衡算法计算获得，那么所述汽机的热耗量通过以下公式获得；It is worth noting that, when in actual work, the boiler power is calculated according to the traditional anti-balance algorithm, then the heat consumption of the steam turbine is obtained by the following formula;

为更清楚的说明本发明所提供的机组发电效率的确定方法，以下整体说明实际工作中，通过本发明如何确定机组的发电效率。In order to more clearly illustrate the method for determining the power generation efficiency of the unit provided by the present invention, the following generally describes how to determine the power generation efficiency of the unit through the present invention in actual work.

锅炉空预器前有热量进行直接供热或是低压省煤器热量，锅炉效率为：There is heat in front of the boiler air preheater for direct heating or low-pressure economizer heat, and the boiler efficiency is:

${η η}_{B B} = = 100100 - - \frac{{ΣL ΣL}_{i i}}{{Q Q}_{a a r r,, n no e e t t}} - - \frac{{ΣQ ΣQ}_{j j}}{10001000 {B B}_{r r} \cdot \cdot {Q Q}_{a a r r,, n no e e t t}} - - - - - - ((11))$

其中：Q_ar,net——每千克燃料的低位发热量，kJ/kg；Among them: Q _{ar,net ——the} lower calorific value per kilogram of fuel, kJ/kg;

∑Q_j——锅炉直接供热量或锅炉沿烟气流程安装在空预热器前面的低压省煤器的吸热量，kJ/h。对于供热电厂，供热量∑Q_j可由电厂仪表直接测出或存在低压省煤器的情况下，根据公式∑Q_j＝Dc_mΔt计算得出，D为工质流量，c_m为工质比热，Δt为工质温差。∑Q _j ——The direct heat supply of the boiler or the heat absorption of the low-pressure economizer installed in front of the empty preheater along the flue gas flow of the boiler, kJ/h. For heating power plants, the heat supply ∑Q _j can be directly measured by the instrumentation of the power plant or if there is a low-pressure economizer, it can be calculated according to the formula ∑Q _j = Dc _m Δt, D is the flow rate of the working fluid, and c _m is the working fluid Specific heat, Δt is the working fluid temperature difference.

再接下，分两种情况说明计算方法；Next, the calculation method is described in two cases;

上述公式中：B_r为锅炉给煤量，t/h；∑L_i为机组的热量损失，kJ/kg；In the above formula: B _r is the coal feed to the boiler, t/h; ∑L _i is the heat loss of the unit, kJ/kg;

机组热量损失包括排烟损失Q2,可燃气体为完全燃烧损失Q3，固体未完全燃烧损失Q4，锅炉散热损失Q5，灰渣显热损失Q6，其中，Q3、Q4由发热量(由样品化验或测量而得)及烟气(根据烟气成分测量)、灰渣的量相乘而得；Q2、Q6由比热容(成分分析确定)、温差(测温元件测量)及烟气、灰渣量(化学反应计算)相乘而得。Unit heat loss includes exhaust smoke loss Q2, combustible gas is complete combustion loss Q3, solid incomplete combustion loss Q4, boiler heat dissipation loss Q5, ash sensible heat loss Q6, among which, Q3 and Q4 are determined by calorific value (tested or measured by samples) obtained) and flue gas (measured according to the composition of flue gas), and the amount of ash and slag are multiplied together; Q2 and Q6 are obtained by the specific heat capacity (determined by component analysis), temperature difference (measured by temperature measuring element) and the amount of flue gas and ash slag (chemical Reaction calculation) multiplied together.

机组发电效率：Generating efficiency of the unit:

$η η = = 36003600 \times \times \frac{{η η}_{B B}}{H h R R} - - - - - - ((22))$

3600——电的热当量，kJ/kW·h；3600——heat equivalent of electricity, kJ/kW h;

HR——汽机的热耗量，kJ/kW·h；HR——The heat consumption of the turbine, kJ/kW h;

此时，汽机热耗可由公式(3)计算：At this time, the heat consumption of the turbine can be calculated by formula (3):

$H h R R = = \frac{{q q}_{m m 11} \times \times {h h}_{11} + + {q q}_{m m 33} \times \times {h h}_{33} - - {q q}_{m m 1111} \times \times {h h}_{1111} - - {q q}_{m m 22} \times \times {h h}_{22}}{{P P}_{G G}} - - - - - - ((33))$

q_m1、h₁——主汽流量(kg/h)、焓(kJ/kg)；q _m1 , h ₁ ——main steam flow rate (kg/h), enthalpy (kJ/kg);

q_m3、h₃——热再热汽流量(kg/h)、焓(kJ/kg)；q _m3 , h ₃ - hot reheat steam flow rate (kg/h), enthalpy (kJ/kg);

q_m11、h₁₁——锅炉给水流量(kg/h)、焓(kJ/kg)；q _m11 , h ₁₁ —— boiler feed water flow rate (kg/h), enthalpy (kJ/kg);

q_m2、h₂——再热冷端蒸汽流量(kg/h)、焓(kJ/kg)；q _m2 , h ₂ ——reheat cold end steam flow rate (kg/h), enthalpy (kJ/kg);

另一种情况则是，若锅炉效率按传统反平衡算法计算，则汽机热耗应按照公式(4)进行计算。Another situation is that if the boiler efficiency is calculated according to the traditional anti-balance algorithm Calculation, the heat consumption of the steam turbine should be calculated according to formula (4).

$H h R R = = \frac{{q q}_{m m 11} \times \times {h h}_{11} + + {q q}_{m m 33} \times \times {h h}_{33} - - {q q}_{m m 1111} \times \times {h h}_{1111} - - {q q}_{m m 22} \times \times {h h}_{22} + + {Q Q}_{j j}}{{P P}_{G G}} - - - - - - ((44))$

相关函数定义参见上述解释，在此不再详述。Refer to the above explanation for the definition of related functions, and will not be described in detail here.

以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限定本发明的保护范围，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

Claims

1. a defining method for unit generation efficiency, is characterized in that, described method comprises:

Before obtaining air preheater, supply is to the relevant caloric information of boiler;

Boiler efficiency according to described relevant heat information acquisition;

Unit generation efficiency is obtained by the heat consumption of described boiler efficiency and steam turbine.

2. the defining method of unit generation efficiency according to claim 1, it is characterized in that, described relevant heat packets of information contains: the thermal loss information of unit, boiler coal feeding amount information, the net calorific value information of every kilogram of fuel, the caloric receptivity information of boiler heat supplying amount information and/or low-pressure coal saver.

3. the defining method of unit generation efficiency according to claim 2, is characterized in that, described according to described relevant heat information acquisition boiler efficiency comprise: according to described relevant caloric information, obtain described boiler efficiency by following formula;

η_{B} = 100 - \frac{{ΣL}_{i}}{Q_{a r, n e t}} - \frac{{ΣQ}_{j}}{1000 B_{r} \cdot Q_{a r, n e t}};

Wherein, Q _{ar, net}for the net calorific value of every kilogram of fuel, kJ/kg; ∑ Q _jfor boiler direct heating amount or boiler are arranged on the caloric receptivity of the low-pressure coal saver before sky primary heater along flue gas flow, kJ/h; B _rfor boiler coal feeding amount, t/h; ∑ L _ifor the thermal loss of unit, kJ/kg.

4. the defining method of unit generation efficiency according to claim 3, is characterized in that, the caloric receptivity of described low-pressure coal saver obtains according to following formula:

∑Q _j＝Dc _mΔt；

Wherein, D is working medium flow, c _mfor working medium specific heat, Δ t is the working medium temperature difference.

5. the defining method of unit generation efficiency according to claim 3, is characterized in that, the thermal loss of described unit comprises: flue gas loss, the complete combustible loss of inflammable gas, heat loss due to unburned carbon, boiler radiation loss, lime-ash sensible heat loss.

6. the defining method of unit generation efficiency according to claim 5, is characterized in that, the complete combustible loss of described inflammable gas and heat loss due to unburned carbon to be multiplied acquisition by the amount of thermal value and flue gas, lime-ash.

7. the defining method of unit generation efficiency according to claim 5, is characterized in that, described flue gas loss and lime-ash sensible heat loss to be multiplied acquisition by specific heat capacity, the temperature difference and flue gas, the grey quantity of slag.

8. the defining method of unit generation efficiency according to claim 1, it is characterized in that, the described heat consumption by described boiler efficiency and steam turbine obtains unit generation efficiency and comprises: the heat consumption according to described boiler efficiency and steam turbine obtains unit generation efficiency by following formula;

η = 3600 \times \frac{η_{B}}{H R};

Wherein, be boiler efficiency; 3600 is electric heat equivalent, kJ/kWh; HR is the heat consumption of steam turbine, kJ/kWh.

9. the defining method of unit generation efficiency according to claim 8, is characterized in that, the heat consumption of described steam turbine is obtained by following formula;

H R = \frac{q_{m 1} \times h_{1} + q_{m 3} \times h_{3} - q_{m 11} \times h_{11} - q_{m 2} \times h_{2}}{P_{G}};

Wherein, q _m1, h ₁for main steam flow, kg/h, enthalpy, kJ/kg; q _m3, h ₃for reheat heat steam flow amount, kg/h, enthalpy, kJ/kg; q _m11, h ₁₁for boiler feedwater flow, kg/h, enthalpy, kJ/kg; q _m2, h ₂for reheating cold junction steam flow, kg/h, enthalpy, kJ/kg.

10. the defining method of unit generation efficiency according to claim 1, is characterized in that, when described boiler power calculates acquisition by classical inverse balanced algorithm, the heat consumption of described steam turbine is obtained by following formula;

H R = \frac{q_{m 1} \times h_{1} + q_{m 3} \times h_{3} - q_{m 11} \times h_{11} - q_{m 2} \times h_{2} + Q_{j}}{P_{G}};