Coal-fired boiler coal quality on-line soft measurement method and system

A technology for coal-fired boilers and soft measurement, which is applied in the intersection of power equipment and information technology, and can solve the problems of large errors, difficulty in ensuring result accuracy, and large fitting errors.

Active Publication Date: 2015-06-10
CHANGZHOU IND TECH RES INST OF ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0004] The results of literature search show that Chinese patent 201010204537.1 discloses a method for real-time calculation of coal quality elements and industrial components, using standard coal consumption for power generation and boiler efficiency to back-calculate the calorific value of coal into the furnace, but due to the large difference between standard coal consumption for power generation and coal quality Correlation, and the method of correcting the element composition with low calorific value has a large error, so this calculation method is difficult to guarantee the accuracy of the result
Chinese patent 02110116.7 discloses a method and device for real-time monitoring of coal quality in power plant boilers, but in the calculated heat balance equation of the intermediate coal mill, an important formula adopted is coal pulverized coal moisture at the outlet of the coal mill = 0.048Mar×R90/ t2 (Mar: received base moisture, R90: pulverize

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  • Coal-fired boiler coal quality on-line soft measurement method and system
  • Coal-fired boiler coal quality on-line soft measurement method and system

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Effect test

Embodiment 1

[0088] figure 1 It is a flow chart of the online soft-sensing method for coal quality of a coal-fired boiler of the present invention.

[0089] Such as figure 1 Shown, the coal-fired boiler coal quality online soft measurement method of the present invention.

[0090] The data involved in this coal-fired boiler online soft-sensing method, that is, boiler flue gas data and unit operating status data include:

[0091] Mar: the average moisture content of coal into the furnace, unit %

[0092] Grml: total amount of coal into the furnace, unit kg

[0093] gammaO 2 : The average value of oxygen at the outlet of the air preheater, unit %

[0094] gamma SO 2 : SO in flue gas 2 content, unit mg / m 3

[0095] tG: exhaust gas temperature, unit ℃

[0096] tA: ambient temperature, unit ℃

[0097] Dgq: the actual evaporation capacity of the boiler, unit t / h

[0098] Grc: reheat steam flow rate, unit kg / h

[0099] Gms: feed water flow, unit kg / h

[0100] Grs: desuperheating wat...

Embodiment 2

[0194] figure 2 It is a functional block diagram of the measurement system of the present invention.

[0195] On the basis of Embodiment 1, the present invention also provides an online soft measurement system for coal quality of a coal-fired boiler, including:

[0196] The raw coal moisture monitoring unit is used to collect the raw coal moisture.

[0197] Specifically, the raw coal moisture monitoring unit is based on the moisture measurement theory of the microwave attenuation method. When measuring the water content of raw coal, the microwave attenuation is accurately measured, the relationship between the microwave attenuation and the water content is found, and the measurement calibration curve is obtained. The moisture monitoring device emits microwaves from above the material and receives microwaves below the conveyor belt. The measuring system determines the moisture content of the material on the conveyor belt by measuring the phase shift and energy attenuation o...

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Abstract

The invention discloses a coal-fired boiler coal quality on-line soft measurement method and system. The coal-fired boiler coal quality on-line soft measurement method includes the steps of (S100) the contents of the as received basis ash content Aar, the dry ash-free basis elemental carbon Cdaf and the dry ash-free basis elemental sulphur Sdaf are assumed; (S200) the uncompleted burned carbon consumption correction amount TCucr, the oxygen volume VO2-daf, the nitrogenn volume VN2-daf and CO2 volume gamma CO2, CO2 and SO2 gross capacity VRO2-daf are calculated according to the contents; (S300) iteration solving is carried out on the dry ash-free basis sulphur calculation value Sdafj, the dry ash-free basis carbon calculation value Cdafj and the fuel low-level heating amount calculation value Qarj according to the calculation values in the step (S200), and the values are output. Coal quality on-line soft measurement is achieved through the adoption of fire coal moisture on-line measurement information, boiler smoke data and unit running state data.

Description

technical field [0001] The invention relates to an online soft measurement method and measurement system for coal quality of a coal-fired boiler, which can realize online analysis of moisture, ash content, calorific value and elements of coal burned by the coal-fired boiler, and belongs to the cross field of power equipment and information technology. Background technique [0002] Coal quality is an important basic information for the operation of coal-fired power plants. The quality of coal in my country's coal-fired power plants generally changes frequently, and accurate online measurement of coal quality is still a technical problem in the power industry. There are still some problems such as low-level problems, and the discharge of pollutants exceeds the standard. There is still a certain gap in the overall operation technology level of the unit compared with foreign units of the same type. Therefore, it is necessary to study and improve the coal quality online measureme...

Claims

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Application Information

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IPC IPC(8): G01N33/22G06F19/00
Inventor 钟崴陈孝武吴燕玲周懿
Owner CHANGZHOU IND TECH RES INST OF ZHEJIANG UNIV
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