CN108019732A - A kind of computational methods for determining double discard heat boiler high-low pressure steam flows - Google Patents

A kind of computational methods for determining double discard heat boiler high-low pressure steam flows Download PDF

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CN108019732A
CN108019732A CN201611033947.8A CN201611033947A CN108019732A CN 108019732 A CN108019732 A CN 108019732A CN 201611033947 A CN201611033947 A CN 201611033947A CN 108019732 A CN108019732 A CN 108019732A
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pressure
heat boiler
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steam
double discard
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赵志渊
林振娴
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/007—Control systems for waste heat boilers

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Abstract

The present invention disclose a kind of computational methods of double discard heat boiler high-low pressure steam flows, mainly for be difficult in prior art arrangement accurately calculate complex working condition under double discard heat boilers calculating its high-low pressure steam production, the waste heat boiler thermal efficiency and discharge fume parameter and design.The computational methods of the thermal efficiency of double discard heat boilers of the present invention and parameter of discharging fume include：The collection of relevant parameter and measure, the judgement of reheat system and the calculating of the calculating of heat, the judgement of afterburning system and the calculating of afterburning amount, the calculating of double discard heat boiler high-low pressure steam flows, double discard heat boilers smoke evacuation parameter and the thermal efficiency again.The present invention can accurately calculate double discard hot pot furnace thermal efficiencies and smoke evacuation parameter, and foundation is provided for double allocation plans of the discard heat boiler in engineering, and then the thermal efficiency of whole engineering system is reached maximum, be finally reached energy-saving purpose.

Description

A kind of computational methods for determining double discard heat boiler high-low pressure steam flows
Technical field
The present invention relates to a kind of field of power machinery of Thermal Power Engineering, more particularly to a kind of double discard heat boilers are in variable working condition The computational methods of high-low pressure steam flow, exhaust gas temperature and boiler efficiency under service condition.
Background technology
Waste heat boiler is raw in industry as one of equipment general in the every profession and trades such as electric power, steel, cement, oil, chemical industry There is consequence in production.In NG Distributed Energy System, waste heat boiler is that fuel is serially used in path upper The thermal discharge in position power station passes to the next power station, becomes the equipment of the caloric receptivity in the next power station.According to the specific composition of system not Together, waste heat boiler can utilize the exhaust production required steam of steam turbine of gas turbine, it is also possible to it is the next to be used only to heating The feedwater of power station steam turbine.Double discard heat boilers can produce the steam of two pressure ratings, its boiler circuit is complex.Using The purpose of double discard heat boilers is in order to recycle the waste heat of combustion turbine exhaustion as much as possible, to improve the Distribution of Natural formula energy The overall thermal efficiency of system.
One of the capital equipment of double discard heat boilers as NG Distributed Energy System, its high and low steam generating amount, The parameters such as boiler thermal efficiency, exhaust gas temperature are vulnerable to the influence in its upper power station.The exhaust parameter in upper power station is vulnerable to environment The influence of factor, fuel factor etc., so that the high and low pressure steam generating amount of double discard heat boilers, boiler thermal efficiency, smoke evacuation temperature The parameters such as degree change.Under the conditions of accurate calculating variable working condition, the high and low pressure steam generating amount of double discard heat boilers, boiler hot Efficiency and smoke evacuation parameter, lay a good foundation for reasonable disposition NG Distributed Energy System.
Therefore, to build one be suitable for variable parameter operation under the conditions of double discard heat boiler high and low pressure steam generating amounts, The computational methods of boiler thermal efficiency and parameter of discharging fume, are the basic means of reasonable disposition NG Distributed Energy System, can Basic data is provided for NG Distributed Energy System operating scheme, there is important Practical significance.
The content of the invention
In view of the above-mentioned problems, the present invention provides a kind of double discard heat boiler high-low pressures being suitable under the conditions of variable parameter operation The computational methods of steam flow.
To reach above-mentioned purpose, a kind of computational methods for determining double discard heat boiler high-low pressure steam flows of the present invention, institute The computational methods for the high-low pressure steam flow stated include：
S1, the collection of relevant parameter and measure；
S2, the calculating of the judgement of reheat system and again heat；
S3, the judgement of afterburning system and the calculating of afterburning amount；
S4, the calculating of double discard heat boiler high and low pressure steam flows；
S5, the calculating of double discard heat boiler smoke evacuation parameters and the thermal efficiency；
Further, the collection of relevant parameter specifically comprises the following steps with measure：
S11, according to project load condition, determines pair pressure and temperature of the high and low pressure steam of discard heat boilers generation respectively Degree；
S12, the high and low pressure steam for double discard heat boilers choose suitable pinch-point temperature difference and approach temperature point respectively；
S13, the information such as gas turbine type, environmental parameter and combustion gas parameter according to used in project, gathers combustion gas wheel Machine smoke evacuation component, exhaust gas temperature and flow, calculate flue gas thermodynamic properties；
S14, according to selected steam turbine type, determines steam turbine exhaust pressure.
Further, the judgement of reheat system and again the calculating of heat include the following steps：
S21, according to project load condition and the steam turbine form of system configuration, determines whether double discard heat boilers need again Hot systems；
S22, according to requirement of the steam turbine to reheated steam parameter, determines the reheat heat steam of steam turbine reheated steam import Temperature and pressure and specific enthalpy, specific entropy, high pressure cylinder discharge cold reheated steam temperature and pressure and specific enthalpy, specific entropy；
Further, afterburning judges and the calculating of afterburning amount includes the following steps：
1) demand according to combustion turbine exhaustion parameter and project to steam load, to double discard heat boilers whether afterburning Judged, and determine afterburning or outer afterburning in afterburning form one；
2) afterburning parameter is specified to determine form：1. combustor exit temperature is specified 2. to specify fuel flow rate 3. to specify low level 4. heat input quantity specifies high-order heat input quantity 5. to specify flue gas temperature rise amount；
3) the volume number of the oxygen consumed when calculating afterburning according to the first calculating formula into the natural gas of afterburning chamber, it is described First calculating formula is：
In formula,The volume number of the oxygen consumed by natural gas during afterburning into afterburning chamber, m3/s；CnHmTo be natural Gas component, %；N is the carbon atom number of gas component；M is the numbers of hydrogen atoms of gas component；
4) it is according to flue gas flow during the second calculating formula calculating afterburning into burner hearth, second calculating formula：
Mg-furnace=Mg-GT+MNG-HRSG+Mair-externally
In formula, Mg-furnaceTo enter the flue gas flow of burner hearth, m3/s；Mg-GTFor the smoke evacuation flow of gas turbine, m3/s； MNG-HRSGFor afterburning when into waste heat boiler gas discharge, m3/s；Mair-externallyTo enter waste heat boiler during outer afterburning Air capacity, m3/s；
Further, the calculating of double discard heat boiler high and low pressure steam flows further includes following steps：
1) calculated according to the flue-gas temperature between the 3rd calculating formula calculating high-pressure economizer and high pressure evaporator, the described 3rd Formula is：
tEB-HPS=tsatw-HPS+tppdt-HPS
In formula, tEB-HPSFlue-gas temperature between high-pressure economizer and high pressure evaporator, DEG C；tsatw-HPSFor high steam The temperature of saturated water under pressure, DEG C；tppdt-HPSFor the pinch-point temperature difference of double discard heat boiler high steams, DEG C；
2) double discard heat boiler high steam flows are calculated according to the 4th calculating formula, the 4th calculating formula is：
(having reheating, steam turbine high-pressure cylinder is without steam extraction)
(there are reheating, turbine high-pressure Cylinder has steam extraction)
(no reheating)
In formula, MHPSFor double discard heat boiler high steam flows, kg/s；To enter the flue gas specific heat capacity of burner hearth, kJ/ (m3·℃)；tg-furnaceFor the flue-gas temperature of double discard heat boiler burner hearth inlet, DEG C；tEB-HPSFor double discard heat boiler high pressures Flue gas mean temperature between economizer and high pressure evaporator, DEG C；MexsFor steam turbine high-pressure cylinder steam extraction amount, kg/s；hHRHSFor heat Reheated steam enthalpy, kJ/kg；hCRHSFor cold reheated steam enthalpy, kJ/kg；hHPSFor double discard heat boiler high steam enthalpies, kJ/kg；hsatw-HPSFor the enthalpy of saturated water under high-pressure steam pressure, kJ/kg；
3) calculated according to the flue-gas temperature between the 5th calculating formula calculating low-pressure coal saver and low pressure evaporator, the described 5th Formula is：
tEB-LPS=tsatw-LPS+tppdt-LPS
In formula, tEB-LPSFlue-gas temperature between low-pressure coal saver and low pressure evaporator, DEG C；tsatw-LPSFor low-pressure steam The temperature of saturated water under pressure, DEG C；tppdt-LPSFor the pinch-point temperature difference of double discard heat boiler low-pressure steams, DEG C；
4) temperature of low-pressure coal saver exit water is calculated according to the 6th calculating formula, the 6th calculating formula is：
tEw-LPS=tsatw-LPS-tapdt-LPS
In formula, tEw-LPSFor the temperature of low-pressure coal saver exit water, DEG C；tsatw-LPSFor saturated water under low-pressure steam pressure Temperature, DEG C；tapdt-LPSFor the approach temperature point of double discard heat boiler low-pressure steams, DEG C；
5) double discard heat boiler low-pressure steam flows are calculated according to the 7th calculating formula, the 7th calculating formula is：
In formula, MLPSFor double discard heat boiler low-pressure steam flows, kg/s；tEB-LPSCoal is saved for double discard heat boiler high-low pressures Flue gas mean temperature between device and low pressure evaporator, DEG C；hEw-LPSFor the enthalpy of low-pressure coal saver exit water, kJ/kg； hLPSFor double discard heat boiler low-pressure steam enthalpies, kJ/kg；hsatw-LPSFor the enthalpy of saturated water under low-pressure steam pressure, kJ/kg；
Further, the calculating of the double smoke evacuation of discard heat boiler parameters and the thermal efficiency further includes following steps：
1) double discard heat boiler exhaust gas temperatures are calculated according to the 8th calculating formula, the 8th calculating formula is：
In formula, t 'gsFor double discard heat boiler exhaust gas temperatures, DEG C；hfwFor double discard heat boiler Enthalpy of Feed Water, kJ/kg；
2) double discard hot pot furnace thermal efficiencies are calculated according to the 9th calculating formula, the 9th calculating formula is：
In formula, ηbFor double discard hot pot furnace thermal efficiencies, %；tairFor environment temperature, DEG C；
Double discard heat boiler high-low pressure steam generating amounts, boiler thermal effect under the conditions of a kind of definite variable parameter operation of the present invention The computational methods of rate and parameter of discharging fume, are obtained by calculation double discard heat boiler high-low pressure steam hair under the conditions of variable parameter operation Raw amount, the thermal efficiency and smoke evacuation parameter, have the following advantages：
1st, overcoming can not accurately calculate because the exhaust parameter in upper power station is subject to extraneous factor under the conditions of the prior art Influence, and then it is inaccurate to cause the parameters such as the high-low pressure steam generating amount, boiler thermal efficiency, exhaust gas temperature of double discard heat boilers to calculate The problem of true；
2nd, the computational methods of double discard heat boiler high-low pressure steam flows of the invention, can be reflected double by result of calculation The operating condition of discard heat boiler, and then the allocation plan for NG Distributed Energy System and the method for operation, optimization operation There is provided and instruct, reach energy saving, the low-loss purpose of drop.
In order to further illustrate technical scheme, specific embodiment of the invention, is opened up by being described below in detail Show.
Brief Description Of Drawings
Fig. 1 is the calculating of double discard heat boiler high-low pressure steam flows under the conditions of a kind of definite variable parameter operation of the present invention Method schematic diagram.
Embodiment
With reference to Figure of description, the present invention will be further described.
It is as shown in Figure 1 a kind of calculating of double discard heat boiler high-low pressure steam flows under the conditions of definite variable parameter operation Method, its process contain collection and the measure of S1 relevant parameters, S2, the calculating of the judgement of reheat system and again heat, S3 benefits Combustion system judges and the calculating of afterburning amount, the calculating of the double discard heat boiler high and low pressure steam flows of S4, the double discard hot pot fire grates of S5 The calculating of cigarette parameter and the thermal efficiency.The calculating is specific as follows：
Collection and the measure of relevant parameter are carried out first, and double discard heat boilers are obtained by instrument measurement and sampling analysis Every input parameter, specifically includes：
According to project load condition, pair pressure and temperature of the high and low pressure steam of discard heat boilers generation is determined respectively；
Suitable pinch-point temperature difference and approach temperature point are chosen respectively for the high and low pressure steam of double discard heat boilers；
The information such as gas turbine type, environmental parameter and combustion gas parameter according to used in project, collection gas turbine row Cigarette component, exhaust gas temperature and flow, calculate flue gas thermodynamic properties；
According to selected steam turbine type, steam turbine exhaust pressure is determined.
According to project load condition and the steam turbine form of system configuration, determine whether double discard heat boilers need reheating system System；
According to requirement of the steam turbine to reheated steam parameter, the temperature of the reheat heat steam of steam turbine reheated steam import is determined Degree and pressure and specific enthalpy, specific entropy, the temperature and pressure and specific enthalpy, specific entropy of the cold reheated steam of high pressure cylinder discharge；
Demand according to combustion turbine exhaustion parameter and project to steam load, to double discard heat boilers whether afterburning into Row judges, and determines afterburning form-interior afterburning or outer afterburning；
Afterburning parameter is specified to determine form：1. combustor exit temperature is specified 2. to specify fuel flow rate 3. to specify low-grade heat 4. input quantity specifies high-order heat input quantity 5. to specify flue gas temperature rise amount；
According to the amount of natural gas V " during solution by iterative method afterburning into afterburning chambers, comprise the following steps that：
1) into the gas flow V " of afterburning chamber during one afterburning of settings；
2) component of the input into the natural gas of afterburning chamber；
3) Lower heat value of natural gas is calculated by the tenth calculating formula, the tenth calculating formula is：
In formula, QNG, LFor natural gas low heat valve, MJ/Nm3；miFor the molal volume percentage of Various Components In Natural Gas Number, %；QI, LIn different burnings and the perfect gas mole low heat valve under reference condition is measured for Various Components In Natural Gas, kJ/mol；PNGFor the pressure of natural gas, kPa；TNGFor the temperature of natural gas, K；Z is gas compressive coefficient；
4) higher calorific value of natural gas is calculated by the 11st calculating formula, the 11st calculating formula is：
In formula, QNG, HFor natural gas high calorific power, MJ/Nm3；QI, HIt is Various Components In Natural Gas in different burning and metering Perfect gas mole low heat valve under reference condition, kJ/mol；
5) density of natural gas is calculated by the 12nd calculating formula, the 12nd calculating formula is：
ρNG=(PNG/(R·TNG))×∑mi·Mi
In formula, ρNGFor natural gas density, kg/Nm3；MiFor the molal weight of Various Components In Natural Gas, kg/kmol.
6) the natural air space number V " during the 13rd calculating formula calculating afterburning into afterburning chamber is passed throughsv, the 13rd meter Formula is：
V″sv=V "s×3.6/ρNG
In formula, V "svFor afterburning when into afterburning chamber natural air space number, m3/s。
7) appearance of oxygen in the flue gas consumed when calculating afterburning by the 14th calculating formula into the natural gas of afterburning chamber Product14th calculating formula is：
In formula,The volume number of oxygen, m in the flue gas consumed by natural gas during afterburning into afterburning chamber3/s；CnHm For gas component, %；N is the carbon atom number of gas component；M is the numbers of hydrogen atoms of gas component.
8) when if outer afterburning, the excess air factor of afterburning chamber is inputted；
9) air capacity that afterburning chamber is consumed when calculating outer afterburning by the 15th calculating formula, the 15th calculating formula For：
In formula, Vair-wbrThe air capacity consumed by afterburning chamber during outer afterburning, m3/s；For hundred of oxygen in surrounding air Divide content, %；
10) the volume number of nitrogen when calculating afterburning by the 16th calculating formula in flue gas, the 16th calculating formula are：
(during interior afterburning)
It is (outer to mend During combustion)
In formula,For afterburning when flue gas in nitrogen volume number, m3/s；For the smoke evacuation component of gas turbine The volume percent of middle nitrogen, %；For the volume percent of nitrogen in surrounding air, %；To enter during afterburning The volume percent of nitrogen, % in the gas component of afterburning chamber；ρflueFor afterburning when into afterburning chamber natural gas density, kg/m3；
11) the volume number of carbon dioxide when calculating afterburning by the 17th calculating formula in flue gas, the described 17th calculates Formula is：
(during interior afterburning)
(during outer afterburning)
In formula,For afterburning when flue gas in carbon dioxide volume number, m3/s；For the row of gas turbine The volume percent of carbon dioxide, % in cigarette component；For the volume percent of carbon dioxide in surrounding air, %；
12) the volume number of water vapour when calculating afterburning by the 18th calculating formula in flue gas, the 18th calculating formula For：
(during interior afterburning)
(during outer afterburning)
In formula,For afterburning when flue gas in water vapour volume number, m3/s；For the smoke evacuation of gas turbine The volume percent of water vapour, % in component；For the volume percent of water vapour in surrounding air, %；
13) the volume number of sulfur dioxide when calculating afterburning by the 19th calculating formula in flue gas, the described 19th calculates Formula is：
In formula,For afterburning when flue gas in sulfur dioxide volume number, m3/s；For the row of gas turbine The volume percent of hydrogen sulfide, % in cigarette component；To enter the appearance of the hydrogen sulfide in natural gas of waste heat boiler afterburning chamber Product percentage, %；
14) the volume number of oxygen when calculating afterburning by the 20th calculating formula in flue gas, the 20th calculating formula are：
(during interior afterburning)
(during outer afterburning)
In formula,For afterburning when flue gas in oxygen volume number, m3/s；For the smoke evacuation component of gas turbine The volume percent of middle oxygen, %；For the volume percent of oxygen in surrounding air, %；
15) the volume number of argon gas when calculating afterburning by the 21st calculating formula in flue gas, the described 21st calculates Formula is：
MAr-GT=(Mg-GT×τAr-GT)/100 (during interior afterburning)
MAr-GT=(Mg-GT×τAr-GT+MNG-HRSG×τAr-HRSG+Vair-wbr×τAr-air)/100 (during outer afterburning)
In formula, MAr-GTFor afterburning when flue gas in argon gas volume number, m3/s；τAr-GTFor in the smoke evacuation component of gas turbine The volume percent of argon gas, %；τAr-HRSGThe volume percent of argon gas, % into the natural gas of waste heat boiler afterburning chamber； τAr-airFor the volume percent of argon gas in surrounding air, %；
16) the total measurement (volume) number of the flue gas of burning generation, the 22nd calculating formula are calculated by the 22nd calculating formula For：
In formula, MGTFor the total measurement (volume) number of the flue gas of burning generation, m3/s；
17) percentage by volume of each component of flue gas after afterburning, the 23rd meter are calculated by the 23rd calculating formula Formula is：
In formula, γiFor the percentage by volume of each component of flue gas after afterburning, %；Wherein, i N2、CO2、H2O、SO2、O2、Ar；
17) gas discharge during the 24th calculating formula calculating afterburning into afterburning chamber, the 24th meter are passed through Formula is：
In formula, V 'sFor afterburning when into afterburning chamber gas discharge, m3/s；hout-HRSGFor double pressure heat boiler outlets Locate flue gas enthalpy, kJ/m3；hout-GTFor the enthalpy of gas turbine exit flue gas, kJ/m3；hairFor surrounding air enthalpy, kJ/ m3；
18) by V 'sWith V "sMake the difference, draw the difference of the two；
If difference is in predetermined error range, it assumes that V "sFor afterburning when into afterburning chamber gas discharge Vs；
If difference is in predetermined error range, by V 'sWith V "sAverage value as new V "s, re-execute State 1)~17) calculating, until V 'sWith V "sDifference meet setting error range；
According to flue gas flow during the second calculating formula calculating afterburning into burner hearth, second calculating formula is：
Mg-furnace=Mg-GT+MNG-HRSG+Mair-externally
In formula, Mg-furnaceTo enter the flue gas flow of burner hearth, m3/s；Mg-GTFor the smoke evacuation flow of gas turbine, m3/s； MNG-HRSGFor afterburning when into waste heat boiler gas discharge, m3/s；Mair-externallyTo enter waste heat boiler during outer afterburning Air capacity, m3/s；
According to high-pressure steam pressure and temperature, the temperature of the enthalpy of high steam, saturated water under high-pressure steam pressure is determined Degree and enthalpy；
According to low-pressure steam pressure and temperature, the temperature of the enthalpy of low-pressure steam, saturated water under low-pressure steam pressure is determined Degree and enthalpy；
According to boiler feed temperature, the enthalpy to feed water is determined；
According to the temperature and pinch-point temperature difference of the saturated water under high and low steam pressure, high and low economizer exit flue gas is determined Temperature and enthalpy；
According to the temperature and approach temperature point of the saturated water under high and low steam pressure, high and low economizer exit water is determined Temperature and enthalpy；
Flue-gas temperature between high-pressure economizer and high pressure evaporator, the 3rd calculating formula are calculated according to the 3rd calculating formula For：
tEB-HPS=tsatw-HPS+tppdt-HPS
In formula, tEB-HPSFlue-gas temperature between high-pressure economizer and high pressure evaporator, DEG C；tsatw-HPSFor high steam The temperature of saturated water under pressure, DEG C；tppdt-HPSFor the pinch-point temperature difference of double discard heat boiler high steams, DEG C；
Double discard heat boiler high steam flows are calculated according to the 4th calculating formula, the 4th calculating formula is：
(having reheating, steam turbine high-pressure cylinder is without steam extraction)
(there is reheating, steam turbine is high Cylinder pressure has steam extraction)
(no reheating)
In formula, MHPSFor double discard heat boiler high steam flows, kg/s；To enter the flue gas specific heat capacity of burner hearth, kJ/ (m3·℃)；tg-furnaceFor the flue-gas temperature of double discard heat boiler burner hearth inlet, DEG C；tEB-HPSFor double discard heat boiler high pressures Flue gas mean temperature between economizer and high pressure evaporator, DEG C；MexsFor steam turbine high-pressure cylinder steam extraction amount, kg/s；hHRHSFor heat Reheated steam enthalpy, kJ/kg；hCRHSFor cold reheated steam enthalpy, kJ/kg；hHPSFor double discard heat boiler high steam enthalpies, kJ/kg；hsatw-HPSFor the enthalpy of saturated water under high-pressure steam pressure, kJ/kg；
Flue-gas temperature between low-pressure coal saver and low pressure evaporator, the 5th calculating formula are calculated according to the 5th calculating formula For：
tEB-LPS=tsatw-LPS+tppdt-LPS
In formula, tEB-LPSFlue-gas temperature between low-pressure coal saver and low pressure evaporator, DEG C；tsatw-LPSFor low-pressure steam The temperature of saturated water under pressure, DEG C；tppdt-LPSFor the pinch-point temperature difference of double discard heat boiler low-pressure steams, DEG C；
The temperature of low-pressure coal saver exit water is calculated according to the 6th calculating formula, the 6th calculating formula is：
tEw-LPS=tsatw-LPS-tapdt-LPS
In formula, tEw-LPSFor the temperature of low-pressure coal saver exit water, DEG C；tsatw-LPSFor saturated water under low-pressure steam pressure Temperature, DEG C；tapdt-LPSFor the approach temperature point of double discard heat boiler low-pressure steams, DEG C；
Double discard heat boiler low-pressure steam flows are calculated according to the 7th calculating formula, the 7th calculating formula is：
In formula, MLPSFor double discard heat boiler low-pressure steam flows, kg/s；tEB-LPSCoal is saved for double discard heat boiler high-low pressures Flue gas mean temperature between device and low pressure evaporator, DEG C；hEw-LPSFor the enthalpy of low-pressure coal saver exit water, kJ/kg； hLPSFor double discard heat boiler low-pressure steam enthalpies, kJ/kg；hsatw-LPSFor the enthalpy of saturated water under low-pressure steam pressure, kJ/kg；
According to the double discard heat boiler exhaust gas temperature t " of solution by iterative methodgs, comprise the following steps that：
1) a double discard heat boiler exhaust gas temperature t " is setgs；
2) according to double discard heat boiler exhaust gas temperatures, smoke evacuation specific heat capacity is determined
3) double discard heat boiler exhaust gas temperatures are calculated according to the 8th calculating formula, the 8th calculating formula is：
In formula, t 'gsFor double discard heat boiler exhaust gas temperatures, DEG C；hfwFor double discard heat boiler Enthalpy of Feed Water, kJ/kg；
By t "gsWith t 'gsMake the difference, draw the difference of the two；
If difference is in predetermined error range, it assumes that t "gsFor double discard heat boiler exhaust gas temperature tgs；
If difference is in predetermined error range, by t "gsWith t 'gsAverage value as new tgs, re-execute State 1)~3) calculating, until t "gsWith t 'gsDifference meet setting error range；
Double discard hot pot furnace thermal efficiencies are calculated according to the 6th calculating formula, the 6th calculating formula is：
In formula, ηbFor double discard hot pot furnace thermal efficiencies, %；tairFor environment temperature, DEG C
More than, it is only preferable case study on implementation of the invention, but protection scope of the present invention is not limited thereto, and it is any to be familiar with Those skilled in the art the invention discloses technical scope in, the change that can be readily occurred in or replacement, should all cover Within protection scope of the present invention.Therefore, protection scope of the present invention should using protection domain that claim is defined as It is accurate.

Claims (6)

  1. A kind of 1. computational methods for determining double discard heat boiler high-low pressure steam flows, it is characterised in that：The high-low pressure steams The computational methods of steam flow amount comprise the following steps：
    S1, the collection of relevant parameter and measure；
    S2, the calculating of the judgement of reheat system and again heat；
    S3, the judgement of afterburning system and the calculating of afterburning amount；
    S4, the calculating of double discard heat boiler high and low pressure steam flows；
    S5, the calculating of double discard heat boiler smoke evacuation parameters and the thermal efficiency.
  2. 2. the computational methods of double discard heat boiler high-low pressure steam flows according to claim 1, it is characterised in that：S1 phases The collection of related parameter further includes following steps with measure：
    S11, according to project load condition, determines pair pressure and temperature of the high and low pressure steam of discard heat boilers generation respectively；
    S12, the high and low pressure steam for double discard heat boilers choose suitable pinch-point temperature difference and approach temperature point respectively；
    S13, the information such as gas turbine type, environmental parameter and combustion gas parameter according to used in project, collection gas turbine row Cigarette component, exhaust gas temperature and flow, calculate flue gas thermodynamic properties；
    S14, according to selected steam turbine type, determines steam turbine exhaust pressure.
  3. 3. the computational methods of double discard heat boiler high-low pressure steam flows according to claim 1, it is characterised in that：S2 is again The calculating of the judgement of hot systems and again heat further includes following steps：
    S21, according to project load condition and the steam turbine form of system configuration, determines whether double discard heat boilers need reheating system System；
    S22, according to requirement of the steam turbine to reheated steam parameter, determines the temperature of the reheat heat steam of steam turbine reheated steam import Degree and pressure and specific enthalpy, specific entropy, the temperature and pressure and specific enthalpy, specific entropy of the cold reheated steam of high pressure cylinder discharge.
  4. 4. the computational methods of double discard heat boiler high-low pressure steam flows according to claim 1, it is characterised in that：S3 is mended The judgement of combustion system and the calculating of afterburning amount further include following steps：
    S31, the volume number of oxygen consumed when calculating afterburning according to the first calculating formula into the natural gas of afterburning chamber, described the One calculating formula is：
    In formula,The volume number of the oxygen consumed by natural gas during afterburning into afterburning chamber, m3/s；CnHmFor natural gas into Point, %；N is the carbon atom number of gas component；M is the numbers of hydrogen atoms of gas component；
    S32, according to flue gas flow during the second calculating formula calculating afterburning into burner hearth, second calculating formula is：
    Mg-furnace=Mg-GT+MNG-HRSG+Mair-externally
    In formula, Mg-furnaceTo enter the flue gas flow of burner hearth, m3/s；Mg-GTFor the smoke evacuation flow of gas turbine, m3/s；MNG-HRSG For afterburning when into waste heat boiler gas discharge, m3/s；Mair-externallyFor outer afterburning when into waste heat boiler air Amount, m3/s。
  5. 5. the computational methods of double discard heat boiler high and low pressure steam flows according to claim 1, it is characterised in that：S4 The calculating of double discard heat boiler high and low pressure steam flows further includes following steps：
    S41, the flue-gas temperature between high-pressure economizer and high pressure evaporator, the 3rd calculating formula are calculated according to the 3rd calculating formula For：
    tEB-HPS=tsatw-HPS+tppdt-HPS
    In formula, tEB-HPSFlue-gas temperature between high-pressure economizer and high pressure evaporator, DEG C；tsatw-HPSFor high-pressure steam pressure The temperature of lower saturated water, DEG C；tppdt-HPSFor the pinch-point temperature difference of double discard heat boiler high steams, DEG C；
    S42, calculates double discard heat boiler high steam flows, the 4th calculating formula is according to the 4th calculating formula：
    (having reheating, steam turbine high-pressure cylinder is without steam extraction)
    (there is reheating, steam turbine high-pressure cylinder has Steam extraction)
    (no reheating)
    In formula, MHPSFor double discard heat boiler high steam flows, kg/s；To enter the flue gas specific heat capacity of burner hearth, kJ/ (m3· ℃)；tg-furnaceFor the flue-gas temperature of double discard heat boiler burner hearth inlet, DEG C；tEB-HPSCoal is saved for double discard heat boiler high pressures Flue gas mean temperature between device and high pressure evaporator, DEG C；MexsFor steam turbine high-pressure cylinder steam extraction amount, kg/s；hHRHSFor reheat heat Steam enthalpy, kJ/kg；hCRHSFor cold reheated steam enthalpy, kJ/kg；hHPSFor double discard heat boiler high steam enthalpies, kJ/ kg；hsatw-HPSFor the enthalpy of saturated water under high-pressure steam pressure, kJ/kg；
    S43, the flue-gas temperature between low-pressure coal saver and low pressure evaporator, the 5th calculating formula are calculated according to the 5th calculating formula For：
    tEB-LPS=tsatw-LPS+tppdt-LPS
    In formula, tEB-LPSFlue-gas temperature between low-pressure coal saver and low pressure evaporator, DEG C；tsatw-LPSFor low-pressure steam pressure The temperature of lower saturated water, DEG C；tppdt-LPSFor the pinch-point temperature difference of double discard heat boiler low-pressure steams, DEG C；
    S44, the temperature of low-pressure coal saver exit water is calculated according to the 6th calculating formula, and the 6th calculating formula is：
    tEw-LPS=tsatw-LPS-tapdt-LPS
    In formula, tEw-LPSFor the temperature of low-pressure coal saver exit water, DEG C；tsatw-LPSFor the temperature of saturated water under low-pressure steam pressure Degree, DEG C；tapdt-LPSFor the approach temperature point of double discard heat boiler low-pressure steams, DEG C；
    S45, calculates double discard heat boiler low-pressure steam flows, the 7th calculating formula is according to the 7th calculating formula：
    In formula, MLPSFor double discard heat boiler low-pressure steam flows, kg/s；tEB-LPSFor double discard heat boiler high-low pressure economizers and Flue gas mean temperature between low pressure evaporator, DEG C；hEw-LPSFor the enthalpy of low-pressure coal saver exit water, kJ/kg；hLPSFor Double discard heat boiler low-pressure steam enthalpies, kJ/kg；hsatw-LPSFor the enthalpy of saturated water under low-pressure steam pressure, kJ/kg.
  6. 6. the computational methods of double discard heat boiler high-low pressure steam flows according to claim 1, it is characterised in that：S5 is double The calculating of discard heat boiler smoke evacuation parameter and the thermal efficiency further includes following steps：
    S51, calculates double discard heat boiler exhaust gas temperatures, the 8th calculating formula is according to the 8th calculating formula：
    In formula, t 'gxFor double discard heat boiler exhaust gas temperatures, DEG C；hfwFor double discard heat boiler Enthalpy of Feed Water, kJ/kg；
    S52, calculates double discard hot pot furnace thermal efficiencies, the 9th calculating formula is according to the 9th calculating formula：
    In formula, ηbFor double discard hot pot furnace thermal efficiencies, %；tairFor environment temperature, DEG C.
CN201611033947.8A 2016-11-23 2016-11-23 A kind of computational methods for determining double discard heat boiler high-low pressure steam flows Pending CN108019732A (en)

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