CN106529007B - For with low low-level (stack-gas) economizer-steam air heater operation boiler thermal efficiency calculation method - Google Patents
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- CN106529007B CN106529007B CN201610965767.7A CN201610965767A CN106529007B CN 106529007 B CN106529007 B CN 106529007B CN 201610965767 A CN201610965767 A CN 201610965767A CN 106529007 B CN106529007 B CN 106529007B
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- 238000004364 calculation method Methods 0.000 title claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000000779 smoke Substances 0.000 claims abstract description 9
- 238000013461 design Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 235000019504 cigarettes Nutrition 0.000 claims 1
- 239000007789 gas Substances 0.000 description 53
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 208000011580 syndromic disease Diseases 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000012804 iterative process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Abstract
The invention discloses a kind of for low low-level (stack-gas) economizer-steam air heater operation boiler thermal efficiency calculation method, comprising the following steps: step 1 calculates low low-level (stack-gas) economizer-steam air heater operating system heat credit Qwl；Step 2, using air preheater outlet smoke temperature as exhaust gas temperature, calculates heat loss due to exhaust gas Q using environment temperature as entrance supply air temperature2；Then conversion heat loss due to exhaust gas Q ' can be obtained2, step 3 is by converting heat loss due to exhaust gas Q '2Value retrodict calculate conversion exhaust gas temperature θzs；Step 4 is to convert exhaust gas temperature θzsTo survey exhaust gas temperature, environment temperature is entrance supply air temperature, calculates actual measurement boiler thermal efficiency；Exhaust gas temperature θ will be convertedzsIt is adapted to design entry supply air temperature, can be obtained and carry out the revised boiler thermal efficiency of supply air temperature.
Description
Technical field
The invention discloses a kind of for low low-level (stack-gas) economizer-steam air heater operation boiler thermal efficiency calculation method.
Background technique
With the development that domestic minimum discharge and reducing energy consumption work, which there is a new technical solution, i.e.,
Low low-level (stack-gas) economizer joint steam air heater transformation.Low low-level (stack-gas) economizer is installed additional in former deduster inlet flue duct, and cooperation electric precipitator changes
It makes, realizes low temperature dedusting, reach electric precipitation outlet dust emission target；Steam air heater is set, after the heating of low low-level (stack-gas) economizer
Condensed water heats air preheater entrance wind-warm syndrome.This system had not only been able to satisfy the needs of low temperature dedusting, but also energy heat-setting water, exclusion one
Part is evacuated, while also achieving the UTILIZATION OF VESIDUAL HEAT IN of tail flue gas, and economic benefit is obvious.But this emerging technology scheme is also pot
The calculating of the efficiency of furnace brings certain interference, needs to bring into steam air heater heat as external heat using the method for national regulations
Amount, then the amendment with steam air heater is carried out to exhaust gas temperature (air preheater outlet smoke temperature), this makeover process needs point three kinds of situations
It discusses, modification method is cumbersome, therefore proposes a kind of boiler efficiency calculation method for not needing to be modified steam air heater.
Summary of the invention
In order to solve the technical problems existing in the prior art, the invention discloses one kind for low low-level (stack-gas) economizer-
The boiler thermal efficiency calculation method of steam air heater operation.
The technical solution adopted by the invention is as follows:
It is a kind of for low low-level (stack-gas) economizer-steam air heater operating system boiler thermal efficiency calculation method, including following step
It is rapid:
Step 1 calculates low low-level (stack-gas) economizer-steam air heater operating system heat credit Qwl, formula is as follows:
Qwl=Dln(h″ln-h′ln)
In formula: DlnCondensate flow in steam air heater, kg/h；hln"-steam air heater exports condensed water enthalpy, kJ/kg；hln’-
Steam air heater entrance condensed water enthalpy, kJ/kg；
Step 2, to survey air preheater outlet smoke temperature as exhaust gas temperature, is counted using environment temperature as the entrance supply air temperature of system
Calculate heat loss due to exhaust gas Q2；Then conversion heat loss due to exhaust gas Q ' can be obtained2, formula is as follows:
Q′2=Q2-Qwl
Step 3 passes through Q '2Value retrodicted using the method for iteration calculate conversion exhaust gas temperature θzs；
Step 4 is to convert exhaust gas temperature θzsInstead of surveying exhaust gas temperature, environment temperature is entrance supply air temperature, according to national standard
The calculation method that GB10184-1988 the 6th, 7 sections provide, calculates actual measurement boiler thermal efficiency, will convert exhaust gas temperature θzsIt is adapted to
Design entry supply air temperature can be obtained and carry out the revised boiler thermal efficiency of supply air temperature.
Heat loss due to exhaust gas Q is calculated in the step 22Method be according to 6.3.1 section formula in GB10184-1988
(35)-(52) are come what is calculated.
Exhaust gas temperature Q is converted in the step 3zsIterative computing method it is as follows,
It is Q ' that conversion heat loss due to exhaust gas, which is calculated, by step 2 first2, it is then assumed that an exhaust gas temperature is θ 'py, foundation
6.3.1 saves formula (35)-(52) and calculates exhaust gas temperature θ ' in GB10184-1988pyCorresponding heat loss due to exhaust gas is QzsIf
Meet condition | Qzs-Q′2|≤0.05%, then θzs=θ 'pyIf being unsatisfactory for condition | Qzs-Q′2|≤0.05%, then from new settings
θ′py, until meeting condition | Qzs-Q′2| until≤0.05%.
Beneficial effects of the present invention are as follows:
The present invention proposes the calculation method of conversion exhaust gas temperature, in the boiler thermal efficiency for being adapted to design wind-warm syndrome calculates,
It replaces actual measurement exhaust gas temperature to be designed supply air temperature amendment very simple to convert exhaust gas temperature, avoids conventional method amendment
In the process to the cumbersome discussion of steam air heater.
Detailed description of the invention
The low low-level (stack-gas) economizer of Fig. 1-steam air heater system；
Fig. 2 converts exhaust gas temperature QzsIterative calculation flow chart.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing:
As shown in Figure 1, this method is suitable for the boiler controller system with low low-level (stack-gas) economizer joint steam air heater, the System describe
Flow into low low-level (stack-gas) economizer for the condensed water of certain low-pressure heater outlet, condensed water in low low-level (stack-gas) economizer through flue gas,
The air that condensed water in steam air heater transfers heat to air preheater entrance is flowed into later, and then it is low to return to next stage for condensed water
Heater is pressed, the air after being heated enters air preheater, as shown in Figure 1.
The formula that counter balancing method calculates boiler efficiency can simplify as follows:
In formula: η --- boiler efficiency, %；
Q1--- the heat of boiler effective use, kJ/kg；
Qr--- 1kg fuel brings the heat of boiler, kJ/kg into；
Qs--- the sum of boiler various heat losses, kJ/kg；
Have again:
Qs=Q2+Q3+Q4+Q5+Q6 (2)
In formula: Q2--- heat loss due to exhaust gas, kJ/kg；
Q3--- chemical imperfect combustion heat loss, kJ/kg；
Q4--- Mechanical adsorption, kJ/kg；
Q5--- radiation loss, kJ/kg；
Q6--- other heat loss, kJ/kg；
When boiler controller system operation with low low-level (stack-gas) economizer-steam air heater, since to bring boiler into a part of external for steam air heater
Heat Qwl, conventionally this heat should be included in QrIn, the problem of bringing therewith, is repaired being designed supply air temperature
Timing needs to consider the influence of steam air heater, this influence need to divide three kinds of situation analysis, comparatively laborious.
Since the heat of steam air heater heating air preheater inlet air is from condensed water, this partial heat of condensed water
Smoke exhaust heat after air preheater, it can be said that steam air heater brings the heat credit Q of boiler intowlUltimately from smoke evacuation
Heat Q2, therefore we subtract this heat from exhaust gas heat loss's disalignment, the flue gas loss heat Q ' converted2=Q2-
Qwl, by Q '2Value retrodicted using the method for iteration calculate conversion exhaust gas temperature θzs, at this point, to convert exhaust gas temperature θzsGeneration
It is to survey boiler thermal efficiency for the calculated boiler efficiency of actual exhaust gas temperature, exhaust gas temperature is adapted to design supply air temperature
When, it need to will only convert exhaust gas temperature θzsIt is adapted to design supply air temperature, because alreading have accounted for the influence of heat credit, institute
It brings calculation procedure into and can be obtained to be designed so that exhaust gas temperature without considering the complex effects of steam air heater, will be converted after amendment and send
The revised boiler thermal efficiency of air temperature.
The specific calculation method of the present invention is as follows:
(1) heat credit Q is calculated firstwl, calculation formula is as follows:
Qwl=Dln(h″ln-h′ln) (3)
In formula:
DlnCondensate flow in steam air heater, kg/h；
hln"-steam air heater exports condensed water enthalpy, kJ/kg；
hln'-steam air heater entrance condensed water enthalpy, kJ/kg；
(2) using environment temperature as entrance supply air temperature, using air preheater outlet smoke temperature as exhaust gas temperature, according to GB10184-
6.3.1 saves formula (35)-(52) and calculates heat loss due to exhaust gas Q in 19882；
Then conversion heat loss due to exhaust gas Q ' can be obtained2, formula is as follows:
Q′2=Q2-Qwl (4)
(3) pass through Q '2Value retrodicted using the method for iteration calculate conversion exhaust gas temperature θzs。
Convert exhaust gas temperature QzsIterative process as shown in Fig. 2, QzsTo assume exhaust gas temperature θ 'pyCorresponding smoke evacuation
Heat loss, entrance supply air temperature at this time all take environment temperature, calculate exhaust gas heat loss by exhaust gas temperature and entrance supply air temperature
The method that the method for mistake is provided according to Section 6.2 of GB10184-1988 is calculated, and is not repeated here.
Specifically as shown in flow chart 2, specific process is as follows:
Conversion heat loss due to exhaust gas Q ' is calculated first2, it is then assumed that an exhaust gas temperature is θ 'py, calculate the smoke evacuation
The corresponding heat loss due to exhaust gas of temperature is Qzs, if meeting condition | Qzs-Q′2|≤0.05%, then θzs=θ 'pyIf be unsatisfactory for
Condition | Qzs-Q′2|≤0.05%, then from new settings θ 'py, until meeting condition | Qzs-Q′2| until≤0.05%.
(4) to convert exhaust gas temperature θzsInstead of surveying exhaust gas temperature, environment temperature is entrance supply air temperature, according to national standard
The method that GB10184-1988 the 6th, 7 sections provide, calculates actual measurement boiler thermal efficiency, will convert exhaust gas temperature θzsIt is adapted to design
Entrance supply air temperature can be obtained and carry out the revised boiler thermal efficiency of supply air temperature.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (5)
1. a kind of for the boiler thermal efficiency calculation method with the operation of low low-level (stack-gas) economizer-steam air heater, which is characterized in that including with
Lower step:
Step 1 calculates low low-level (stack-gas) economizer-steam air heater operating system heat credit Qwl；
Step 2, using air preheater outlet smoke temperature as exhaust gas temperature, is calculated using environment temperature as the entrance supply air temperature of operating system
Heat loss due to exhaust gas Q2；Then conversion heat loss due to exhaust gas Q ' can be obtained2, formula is as follows:
Q′2=Q2-Qwl
Step 3 passes through conversion heat loss due to exhaust gas Q '2Value using the method for iteration calculate conversion exhaust gas temperature θzs；
Step 4 is to convert exhaust gas temperature θzsTo survey exhaust gas temperature, environment temperature is entrance supply air temperature, calculates actual measurement boiler
The thermal efficiency；Exhaust gas temperature θ will be convertedzsIt is adapted to design entry supply air temperature, can be obtained and carry out the revised pot of supply air temperature
Furnace thermal efficiency.
2. boiler thermal efficiency calculation method as described in claim 1, which is characterized in that the heat credit QwlCalculating side
Method is as follows:
Qwl=Dln(h″ln-h′ln) (3)
In formula: DlnCondensate flow in steam air heater, kg/h；hln"-steam air heater exports condensed water enthalpy, kJ/kg；hln'-warm wind
Device entrance condensed water enthalpy, kJ/kg.
3. boiler thermal efficiency calculation method as described in claim 1, which is characterized in that QwlThe row of calculating in the step 2
Cigarette heat loss Q2Method calculated according to GB10184-1988.
4. boiler thermal efficiency calculation method as described in claim 1, which is characterized in that QwlThe actual measurement boiler thermal efficiency according to
It is calculated according to GB10184-1988 calculation procedure.
5. boiler thermal efficiency calculation method as described in claim 1, which is characterized in that convert exhaust gas temperature θ in step 3zs's
Method is as follows:
Firstly, it is Q ' that conversion heat loss due to exhaust gas, which is calculated, by step 22, it is then assumed that an exhaust gas temperature is θ 'py, foundation
6.3.1 saves formula (35)-(52) and calculates exhaust gas temperature θ ' in GB10184-1988pyCorresponding heat loss due to exhaust gas is QzsIf
Meet condition | Qzs-Q′2|≤0.05%, then θzs=θ 'pyIf being unsatisfactory for condition | Qzs-Q′2|≤0.05%, then from new settings
θ′py, until meeting condition | Qzs-Q′2| until≤0.05%.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6584429B1 (en) * | 1999-08-06 | 2003-06-24 | Exergetic Systems Llc | Input/loss method for determining boiler efficiency of a fossil-fired system |
| CN103778334A (en) * | 2014-01-20 | 2014-05-07 | 上海交通大学 | Method for measuring boiler thermal efficiency of coal fired power plant in real time |
| CN103995987A (en) * | 2014-06-05 | 2014-08-20 | 中冶华天工程技术有限公司 | Heat efficiency calculating method for pulverized coal boiler with blending combustion of blast furnace gas |
| CN105468932A (en) * | 2016-01-06 | 2016-04-06 | 夏继英 | Heating efficiency online calculation method for boiler |
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2016
- 2016-11-04 CN CN201610965767.7A patent/CN106529007B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6584429B1 (en) * | 1999-08-06 | 2003-06-24 | Exergetic Systems Llc | Input/loss method for determining boiler efficiency of a fossil-fired system |
| CN103778334A (en) * | 2014-01-20 | 2014-05-07 | 上海交通大学 | Method for measuring boiler thermal efficiency of coal fired power plant in real time |
| CN103995987A (en) * | 2014-06-05 | 2014-08-20 | 中冶华天工程技术有限公司 | Heat efficiency calculating method for pulverized coal boiler with blending combustion of blast furnace gas |
| CN105468932A (en) * | 2016-01-06 | 2016-04-06 | 夏继英 | Heating efficiency online calculation method for boiler |
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Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: SHANDONG ELECTRIC POWER Research Institute Patentee after: SHANDONG ZHONGSHI YITONG GROUP Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: SHANDONG ZHONGSHI YITONG GROUP Co.,Ltd. Patentee before: State Grid Corporation of China |
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| TR01 | Transfer of patent right |
Effective date of registration: 20220128 Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee after: SHANDONG ZHONGSHI YITONG GROUP Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: SHANDONG ZHONGSHI YITONG GROUP Co.,Ltd. Patentee before: STATE GRID CORPORATION OF CHINA |
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