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Method for calculating grinding output of MP-G type medium-speed coal mill

A technology of MP-G and coal pulverizer, which is applied in computing, instrumentation, electrical digital data processing, etc., can solve problems such as high concentration of NOx, grinding output not reaching the design value, and aggravated slagging in the furnace if the pulverized coal is too coarse. , to achieve the effects of reducing the concentration of NOx formation, improving the load carrying capacity, and alleviating the slagging of the furnace and boiler

Active Publication Date: 2019-12-20
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Through the actual operation test of medium-difficult-to-grind coal on this type of coal pulverizer, the results show that the actual grinding output of this type of coal pulverizer is far from the design value , resulting in difficulty in loading the unit, aggravated slagging in the furnace if the pulverized coal is too coarse, high concentration of NOx formation, and the inability to mix and burn economical coal with low calorific value, etc.

Method used

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  • Method for calculating grinding output of MP-G type medium-speed coal mill
  • Method for calculating grinding output of MP-G type medium-speed coal mill
  • Method for calculating grinding output of MP-G type medium-speed coal mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Calculation of the grinding output of the MP-235G coal mill for Nalinhe coal.

[0035] Step 1: Provided by the owner to calculate the basic coal quality parameters of the coal sample: received basic moisture M t (%), received base ash A ar (%), Hastelloy Grinding Index HGI, at the same time determine the coal fineness R that needs to be ground 90 (%).

[0036] The Nalin River coal sample: M t = 14%, A ar =14.77%, HGI=68, R 90 = 20%;

[0037] Step 2: Calculate the grinding output B of the MP-G medium-speed coal pulverizer according to the power industry standard "Code for Design and Calculation of Coal Milling System in Thermal Power Plants" (DL / T5145-2012) M . The calculation method of the MP-G medium-speed coal mill is the same as that of the MPS coal mill, but the basic output of the coal mill is different.

[0038] B M =B MO × f H × f R × f M × f A × f g × f e × f si

[0039] B M0 —The basic output of the coal mill, t / h, the value is det...

Embodiment 2

[0063] Example 2: Calculation of the grinding output of the MP-235G coal mill of Dongfanghong Coal.

[0064] Step 1: The owner provides the basic coal quality parameters for calculating the coal sample and receives the basic moisture content M t (%), received base ash A ar (%), Hastelloy Grinding Index HGI, at the same time determine the coal fineness R that needs to be ground 90 (%).

[0065] This Dongfanghong coal sample: M t =14.3%, A ar =8.54%, HGI=54, R 90 = 18%;

[0066] Step 2: Calculate the grinding output B of the MP-G medium-speed coal pulverizer according to the power industry standard "Code for Design and Calculation of Coal Milling System in Thermal Power Plants" (DL / T5145-2012) M . The calculation method of the MP-G medium-speed coal mill is the same as that of the MPS coal mill, but the basic output of the coal mill is different.

[0067] B M =B MO × f H × f R × f M × f A × f g × f e × f si

[0068] B M0 —The basic output of the coal mill, t / h...

Embodiment 3

[0092] Example 3: Calculation of the grinding output of the MP-235G pulverizer for coal blending in Yulin.

[0093] Step 1: The owner provides the basic coal quality parameters for calculating the coal sample and receives the basic moisture content M t (%), received base ash A ar (%), Hastelloy Grinding Index HGI, at the same time determine the coal fineness R that needs to be ground 90 (%).

[0094] This Dongfanghong coal sample: M t = 12.5%, A ar =25.00%, HGI=60, R 90 = 15%;

[0095] Step 2: Calculate the grinding output B of the MP-G medium-speed coal pulverizer according to the power industry standard "Code for Design and Calculation of Coal Milling System in Thermal Power Plants" (DL / T5145-2012) M . The calculation method of the MP-G medium-speed coal mill is the same as that of the MPS coal mill, but the basic output of the coal mill is different.

[0096] B M =B MO × f H × f R × f M × f A × f g × f e × f si

[0097] B M0 —The basic output of the coal ...

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Abstract

The invention discloses a method for calculating the grinding output of an MP-G type medium-speed coal mill, which comprises the following steps: 1, providing basic coal quality parameters for calculating a coal sample: received basis total moisture Mt, received basis ash content Aar and a Hardgrove grindability index HGI, and determining the fineness R90 of pulverized coal to be ground at the same time; 2, calculating the grinding output BM of the MP-G type medium-speed coal mill according to the power industry standard, namely the design specification DL / T 5145-2012 of a coal pulverizing system of a thermal power plant; 3, calculating the final grinding output BMX of the MP-G type medium-speed coal mill. The method is suitable for medium-hard grinding (HGI) power coal, including bituminous coal, meager coal and anthracite, and can be used for coal mill model selection of a newly-built power plant and coal mill transformation of a built power plant. By means of the calculation method,the on-load capacity of the coal mill can be improved, the fineness of pulverized coal has large adjustment allowance, and the problems of hearth slagging, pollutant NOx generation concentration reduction and the like can be solved through pulverized coal fineness adjustment.

Description

technical field [0001] The invention relates to the technical field of grinding output of coal pulverizers, in particular to a method for calculating the grinding output of an MP-G type medium-speed coal pulverizer, which is suitable for medium-difficult-grinding (HGI<70) power coals, including bituminous coal, lean Coal and anthracite can be used for the selection of coal mills for new power plants and the transformation of coal mills for existing power plants. Background technique [0002] The output of the coal mill is one of the important technical indicators for selecting the coal mill model in the project, and it is also one of the main technical indicators for evaluating the technical performance of the coal mill. The output of coal mill usually includes grinding output, ventilation output and drying output. The final output of the coal mill depends on the smallest output among the above three. [0003] MPS medium-speed coal pulverizer began to be used in my coun...

Claims

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Application Information

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IPC IPC(8): G06F17/50B02C23/00
CPCB02C23/00
Inventor 刘家利姚伟杨忠灿
Owner XIAN THERMAL POWER RES INST CO LTD
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