CN110146545A - A method of boiler combustion performance is improved using coal quality burning discriminant index - Google Patents
A method of boiler combustion performance is improved using coal quality burning discriminant index Download PDFInfo
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- CN110146545A CN110146545A CN201910572622.4A CN201910572622A CN110146545A CN 110146545 A CN110146545 A CN 110146545A CN 201910572622 A CN201910572622 A CN 201910572622A CN 110146545 A CN110146545 A CN 110146545A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
Abstract
The invention discloses a kind of methods for improving boiler combustion performance using coal quality burning discriminant index, mainly utilize TG-DTG-DSC (thermogravimetric-differential thermogravimetric-differential scanning calorimetry) heat analysis joint technology, by the quality of coal at any time, the variation of temperature, the data of computer acquisition are analyzed and processed, it obtains the characteristic parameters such as comprehensive combustion discriminant index S, burning earthquake intensity I, average heating strength Q, and then assesses boiler combustion performance.One aspect of the present invention can accurately and comprehensively reflect Combustion Operation of Boilers, to distinguish those high or close and feed coals of combustion position difference of volatilization；On the other hand it can be led to the problem of in combustion with correctly predicted fire coal, find corresponding solution, realize Boiler Stable Combustion.
Description
Technical field
It is the invention belongs to Industrial Boiler Technology field, in particular to a kind of to improve boiler combustion using coal quality burning discriminant index
Burn the method for performance.
Background technique
Currently, fuel used in Industrial Boiler is mainly coal, wherein as-fired coal matter is directly related to the safety warp of boiler
Ji operation.And the coal quality range that the specific type of furnace is adapted to is certain, once exceeding coal quality adaptation range, boiler operatiopn is just
Will appear various problems: kindling is unstable, slagging is serious, boiler tube explosion, undercapacity etc..But enter the feed coal coal quality of furnace not
May be it is unalterable, therefore, generally by technological transformation, burner is made to have wide applicability to fuel；Either
It is definite to grasp burning of coal characteristic, optimum burningsystem and program, it is adapted boiler operatiopn and fuel combustion.Boiler performance
Superiority and inferiority, depends greatly on designer and operations staff grasps the qualification of coal characteristic.
Analysis of coal nature characteristics includes Industrial Analysis, elemental analysis and combustion characteristics of coal etc..The elemental analysis of coal is boiler
Initial data necessary to thermodynamic computing and runnability monitor, but test item is more, the time is long, and it is complicated for operation, to assayer
Member requires height, therefore the inability having carries out this project, even if carrying out, accuracy also needs to be investigated.Therefore, most of Industrial Boilers
Calculating to boiler efficiency, substantially as obtained by the Industrial Analysis approximate calculation of coal.
The country generally uses volatile matter content as the distinguishing rule of coal combustion character quality, but in boiler actual motion
In the process, volatile matter content is close to or higher than design value, still will appear unstable combustion in addition go out furnace the case where.
Summary of the invention
The purpose of the present invention is to provide it is a kind of using coal quality burning discriminant index improve boiler combustion performance method, with
It solves the above problems.
To achieve the above object, the invention adopts the following technical scheme:
A method of boiler combustion performance is improved using coal quality burning discriminant index, comprising the following steps:
Step 1, the coal sampling that granularity is less than 0.2mm is made in coal sample, and coal sampling is divided into two parts；
Step 2, a copy of it coal sampling, first with automatic industrial analysis instrument, air-dried moisture, the sky for measuring coal are dry
Base ash content, empty butt volatile matter；Calorimeter is recycled, the calorific value of coal is measured；It recycles sulphur meter to measure sulphur content, obtains empty dry
Base sulphur content；
Step 3, another coal sampling is tested according to thermogravimetry, obtains the burning velocity DTG of coal sampling
Curve and combustion intensity DSC curve；
Step 4, the integrated combustion property index S that must be produced coal according to the DTG curve in step 3, is shown in formula (1)；
Wherein (dw/dt)maxFor maximum combustion rate；(dw/dt)meanFor average combustion rate；TiFor ignition temperature；ThFor
Burn temperature；
Step 5, burning earthquake intensity I and average heating strength Q are obtained according to the DSC curve in step 3, see formula (2) and
(3)；
I=H/W (2)
Wherein H be DSC curve peak-peak to baseline height；When W is that DSC curve peak width range is corresponding
Between；
Step 6, according to the size of three kinds of discriminant indexs of comparison, the combustibility of coal sampling is differentiated.
Further, it in step 3, specifically includes:
Analysis sample 5mg~10mg is weighed, and is divided in crucible, the initial mass m of sample is recorded and analyzed0；Being equipped with
The crucible of analysis sample is placed on load sample platform, after covering, begins to warm up furnace body；1000 DEG C are warming up to from room temperature；Start journey
Sequence starts to test, named after to be combusted and save burning sample weight vary with temperature curve test coal sample burning lose
Weight TG curve；Burning weight loss TG curve progress differential is obtained into the i.e. burning test specimen of curve that sample combustion speed varies with temperature
The combustion intensity DSC curve for the i.e. burning test specimen of curve that burning velocity DTG curve and sample exotherms intensity vary with temperature.
Further, in step 3, experimental condition are as follows: air atmosphere；Heating rate is 10 DEG C/min；Air velocity is
50L/min。
Further, in step 6, as burning earthquake intensity I < 2.6mw/mg.min, average heating strength Q > 100J/g. DEG C and
Integrated combustion property index S > 6 × 10-8%/min2.℃3When, the comprehensive combustion performance of coal is good.
Compared with prior art, the present invention has following technical effect:
The present invention utilizes thermogravimetry, using comprehensive combustion discriminant index S, burning earthquake intensity I, average heating strength Q, energy
The combustion stability of enough thoroughly evaluating fire coals, boiler when especially volatile matter content is close surely fire implementations；
The present invention can correctly predicted fire coal lead to the problem of in combustion, using corresponding discriminant index, find pair
The solution answered realizes Boiler Stable Combustion；
The foundation that the present invention can differentiate as coal quality, and then distinguish the poor fire coal of volatile matter content higher stability；
The present invention can provide foundation for the design and transformation of boiler combustion system, to optimize boiler combustion performance, mention
High boiler combustion efficiency.
Detailed description of the invention
Fig. 1 is weightlessness, burning velocity and the combustion intensity TG-DTG-DSC curve synoptic diagram of coal；
Specific embodiment
The present invention will be further explained below with reference to examples.
The present invention provides based on a kind of burning discriminant index using coal quality, boiler combustion is more comprehensively judged
Energy.
Coal analysis includes moisture, ash content, volatile matter, calorific value, sulphur content etc., this is equal in general coal analysis laboratory
It is achievable.Then thermogravimetric analyzer the data obtained is utilized, comprehensive combustion discriminant index S, burning earthquake intensity I, average heat release are calculated
Intensity Q value.Under identical operating status, as burning earthquake intensity I < 2.6mw/ (mg.min), average heating strength Q > 100J/
(g. DEG C) and integrated combustion property index S > 6 × 10-8%/(min2.℃3) when, the comprehensive combustion performance of this coal compared with
It is good.
Specific steps are as follows:
Step 1: the general analysis coal sample that granularity is less than 0.2mm is made in coal sample, and analysis sample is divided into two；
Step 2: utilizing automatic industrial analysis instrument, measure the air-dried moisture, empty dry basis ash content, empty butt volatile matter of coal；
Using calorimeter, the calorific value of coal is measured；Sulphur content is measured using sulphur meter, obtains sky butt sulphur content.
Step 3: another is tested according to thermogravimetry；
Experimental condition is as follows:
Atmosphere: air；Heating rate: 10 DEG C/min；Air velocity: 50L/min.
Analysis sample (5~10) mg is weighed, and is divided in crucible, the initial mass m of sample is recorded and analyzed0；Being equipped with
The crucible of analysis sample is placed on load sample platform, after covering, begins to warm up furnace body；From the initial temperature of room temperature with 10 DEG C/min's
Rate is warming up to 1000 DEG C, charge flow rate: air 50L/min；Startup program starts to test, and names and saves after to be combusted
Burning sample weight varies with temperature the burning weight loss TG curve that curve tests coal sample；Burning weight loss TG curve is subjected to differential
Obtain the i.e. burning test specimen of curve that sample combustion speed varies with temperature burning velocity DTG curve and sample exotherms intensity with
Curve, that is, burning test specimen combustion intensity DSC curve of temperature change.
Step: 4: according to the TG-DTG curve in step 3 it can be concluded that the integrated combustion property index S of coal, is shown in formula
(1)；
Wherein (dw/dt)maxFor maximum combustion rate；(dw/dt)meanFor average combustion rate；TiFor ignition temperature；ThFor
Burn temperature.
Step 5: according to the DSC curve in step (3) it can be concluded that burning earthquake intensity I and average heating strength Q, is shown in formula
(2) and (3).
I=H/W (2)
Wherein H be DSC curve peak-peak to baseline height；When W is that DSC curve peak width range is corresponding
Between.
Step 6: the combustibility of sample coal sample differentiates.
The size of three kinds of discriminant indexs of Comprehensive Correlation selects coal quality.Especially when burning earthquake intensity I < 2.6mw/ (mg.min), put down
Equal heating strength Q > 100J/ (g. DEG C) and integrated combustion property index S > 6 × 10-8%/(min2.℃3) when, this coal
Comprehensive combustion better performances.
Illustrate application of the invention by taking certain boiler four times upper coal situations as an example below.The analysis of four coals quality the results are shown in Table
1.If only determined from volatile matter content, 3 volatile matter highest of sample is burnt most stable.But actual conditions are in 58MW boiler
When upper burning, boiler furnace coking is serious.The volatile matter of sample 1, sample 2 and sample 4 is close, in actual operation, 1 He of sample
There is the case where combustion instability on 58MW boiler in sample 2, and 4 combustion position of sample is good.According to the calculating of table 1 it is found that sample
The earthquake intensity of product 3 and heating strength numerical value are higher, are easy to cause heat integrated distribution in a certain region of combustion chamber wall surface, thus to combustion
Burning room avoids damage to or coking.The burning earthquake intensity of sample 1 and sample 2 and heating strength are lower, cause the calorific intensity of coal insufficient,
Temperature cannot be high in time, is unfavorable for catching fire, therefore the case where combustion instability occur.Sample 4, be exactly in burning earthquake intensity compared with
High, integrated combustion property index and all higher situation of heating strength, therefore Combustion Operation of Boilers is good.
The coal analysis data of 1 boiler of table
Claims (4)
1. a kind of method for improving boiler combustion performance using coal quality burning discriminant index, which comprises the following steps:
Step 1, the coal sampling that granularity is less than 0.2mm is made in coal sample, and coal sampling is divided into two parts；
Step 2, a copy of it coal sampling measures air-dried moisture, the empty butt ash of coal first with automatic industrial analysis instrument
Divide, empty butt volatile matter；Calorimeter is recycled, the calorific value of coal is measured；It recycles sulphur meter to measure sulphur content, obtains sky butt sulphur
Point；
Step 3, another coal sampling is tested according to thermogravimetry, obtains the burning velocity DTG curve of coal sampling
With combustion intensity DSC curve；
Step 4, the integrated combustion property index S that must be produced coal according to the DTG curve in step 3, is shown in formula (1)；
Wherein (dw/dt)maxFor maximum combustion rate；(dw/dt)meanFor average combustion rate；TiFor ignition temperature；ThTo burn temperature
Degree；
Step 5, burning earthquake intensity I and average heating strength Q are obtained according to the DSC curve in step 3, sees formula (2) and (3)；
I=H/W (2)
Wherein H be DSC curve peak-peak to baseline height；W is the DSC curve peak width range corresponding time；
Step 6, according to the size of three kinds of discriminant indexs of comparison, the combustibility of coal sampling is differentiated.
2. a kind of method for improving boiler combustion performance using coal quality burning discriminant index, which is characterized in that in step 3, specifically
Include:
Analysis sample 5mg~10mg is weighed, and is divided in crucible, the initial mass m of sample is recorded and analyzed0；Equipped with analysis sample
The crucible of product is placed on load sample platform, after covering, begins to warm up furnace body；1000 DEG C are warming up to from room temperature；Startup program starts
Test, names after to be combusted and saves burning sample weight and vary with temperature the burning weight loss TG song that curve tests coal sample
Line；Burning weight loss TG curve progress differential is obtained to the burning speed for the i.e. burning test specimen of curve that sample combustion speed varies with temperature
The combustion intensity DSC curve for the i.e. burning test specimen of curve that degree DTG curve and sample exotherms intensity vary with temperature.
3. a kind of method for improving boiler combustion performance using coal quality burning discriminant index, which is characterized in that in step 3, test
Condition are as follows: air atmosphere；Heating rate is 10 DEG C/min；Air velocity is 50L/min.
4. a kind of method for improving boiler combustion performance using coal quality burning discriminant index, which is characterized in that in step 6, work as combustion
Burn earthquake intensity I < 2.6mw/mg.min, average heating strength Q > 100J/g. DEG C and integrated combustion property index S > 6 × 10-8%/
min2.℃3When, the comprehensive combustion performance of coal is good.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112649319A (en) * | 2020-01-16 | 2021-04-13 | 宁波杉杉新材料科技有限公司 | Analysis method for evaluating quality of coke raw material |
| CN114062427A (en) * | 2021-11-17 | 2022-02-18 | 兰州理工大学 | Coal oxidation characteristic temperature determination method |
| CN114941839A (en) * | 2022-05-12 | 2022-08-26 | 清华大学 | Method for measuring feeding temperature of circulating fluidized bed boiler |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090277080A1 (en) * | 2006-08-12 | 2009-11-12 | Day Paul G | Coal with improved combustion properties |
| CN108680699A (en) * | 2018-04-28 | 2018-10-19 | 西安热工研究院有限公司 | A kind of test of thermal coal flammability and evaluation method |
| CN108918318A (en) * | 2018-04-28 | 2018-11-30 | 西安热工研究院有限公司 | A kind of test and evaluation method of thermal coal after-flame performance |
| CN109212156A (en) * | 2018-09-14 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of method and system with coal-fired industry analysis result characterization thermobalance method ignition stability index |
-
2019
- 2019-06-28 CN CN201910572622.4A patent/CN110146545A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090277080A1 (en) * | 2006-08-12 | 2009-11-12 | Day Paul G | Coal with improved combustion properties |
| CN108680699A (en) * | 2018-04-28 | 2018-10-19 | 西安热工研究院有限公司 | A kind of test of thermal coal flammability and evaluation method |
| CN108918318A (en) * | 2018-04-28 | 2018-11-30 | 西安热工研究院有限公司 | A kind of test and evaluation method of thermal coal after-flame performance |
| CN109212156A (en) * | 2018-09-14 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of method and system with coal-fired industry analysis result characterization thermobalance method ignition stability index |
Non-Patent Citations (1)
| Title |
|---|
| 刘瑞芝等: "水泥工业中煤的燃烧特性评价方法", 《水泥技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112649319A (en) * | 2020-01-16 | 2021-04-13 | 宁波杉杉新材料科技有限公司 | Analysis method for evaluating quality of coke raw material |
| CN114062427A (en) * | 2021-11-17 | 2022-02-18 | 兰州理工大学 | Coal oxidation characteristic temperature determination method |
| CN114941839A (en) * | 2022-05-12 | 2022-08-26 | 清华大学 | Method for measuring feeding temperature of circulating fluidized bed boiler |
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Application publication date: 20190820 |