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Primary air pressure control method for coal mill unit and control system

A pressure control and control system technology, applied in the field of electric power, can solve problems such as energy waste, failure to consider the operation of the coal mill, and reduce the economy of the unit, so as to achieve the goals of reducing power consumption, accurate and objective calculation, and reducing energy consumption. Effect

Inactive Publication Date: 2018-11-23
DATANG HANCHENG NO 2 POWER GENERATION
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the primary air pressure setting value is only adjusted according to the load command, that is, according to the change of the AGC command, it can quickly adapt to the needs of load changes, but this setting value calculation method does not consider the operation of the coal mill , causing energy waste and reducing the economy of unit operation

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  • Primary air pressure control method for coal mill unit and control system
  • Primary air pressure control method for coal mill unit and control system

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Embodiment 1

[0051] like Figure 1 to Figure 2 As shown, this embodiment discloses a method for controlling primary air pressure of a coal mill unit. One unit of a thermal power plant is generally equipped with two primary fans, and multiple coal mills blow the pulverized coal inside to the boiler for combustion through the primary wind pressure provided by the primary fans to realize energy conversion. In order to better control the pulverized coal entering the furnace, on the one hand, it depends on the output of the coal mill, and on the other hand, it depends on the primary air pressure setting value of the primary air of the coal wind volume). The primary air pressure setting value of the coal mill unit is obtained by the control system through calculation of the primary air pressure setting value variable.

[0052] like figure 1 As shown, the variable of the primary air pressure setting value of the present invention includes: the function value of the load command after being cal...

Embodiment 2

[0074] This embodiment discloses a control system that applies the primary air pressure control method of the coal mill unit as described in Embodiment 1. The set value of the primary air pressure of the coal mill unit is obtained by calculating the variable of the set value of the primary air pressure. The variable of the primary air pressure setting value includes: the function value of the load command after the function calculation, the total air volume required by the coal mill, the bias set by the operator, the load command and the load deviation value of the unit, and the main steam pressure setting value The deviation from the actual main steam pressure of the unit.

[0075] like figure 1 As shown, the variable of the primary air pressure setting value of the present invention includes: the function value of the load command after being calculated by the function 2 of the load command of the unit, the total air volume 3 required by the coal mill, the bias 1 set by the ...

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Abstract

The invention discloses a primary air pressure control method for a coal mill unit and a control system, and is applicable to a thermal power generating unit. The thermal power generating unit comprises the coal mill unit and a control system thereof. A primary air pressure set value of the coal mill unit is obtained by operating a primary air pressure set value variable by the control system. Theprimary air pressure set value variable comprises a function value of a load command after function operation, needed total air quantity of the coal mill, offset set by an operator, a deviation valueof the load command and a unit load and a deviation value of a main steam pressure set value and the actual main steam pressure of the unit. By considering the influence of variables of the primary air pressure set value on the result comprehensively and optimizing the operating process of the primary air pressure value, the primary air pressure set valve meets the demand of the coal mill more accurately, so that the fluctuation of the main steam pressure value of the unit is reduced, the operation of the unit is stabilized, the economical property of the operation of the unit is improved, and the electric consumption of the primary air unit is reduced.

Description

technical field [0001] The invention relates to the electric power industry, in particular to a method and system for controlling the primary air pressure of a coal grinding unit. Background technique [0002] Energy conservation and emission reduction is a major strategic issue related to sustainable economic and social development. The electric power industry is not only a creator of high-quality clean energy, but also a large primary energy consumer and a major polluter. Therefore, it is also a key area for the country to implement energy conservation and emission reduction. Energy saving and consumption reduction of thermal power generating units is an important measure to respond to the national energy saving and emission reduction and low-carbon economy, and it is an effective measure to enhance the market competitiveness of thermal power plants. [0003] Thermal power generation refers to the general term for using the heat generated by the combustion of coal and oth...

Claims

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Application Information

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IPC IPC(8): F23N3/00
CPCF23N3/007
Inventor 程俊玲王巍杨玉琴李孝红梁振武李亮张璐杨鹏
Owner DATANG HANCHENG NO 2 POWER GENERATION
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