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Coal mill primary air control logic optimization method

A technology of control logic and optimization method, applied in the direction of comprehensive factory control, grain processing, etc., to achieve the effect of increased reliability

Active Publication Date: 2022-05-27
HUANENG SHANGHAI SHIDONGKOU SECOND POWER PLANT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, this logic can only control the coal mill outlet temperature and the coal mill inlet air volume. When the coal mill inlet air volume is satisfied but the outlet temperature does not reach the set value, the coal mill inlet temperature will continue to increase, and the coal is heating. During the heating process, a variety of flammable gases will be released, and there is a certain risk of deflagration. According to the data, it is found that if the temperature is too high and greater than 300 degrees during the heating process, CH4 gas will be precipitated. The deflagration limit of CH4 gas at room temperature is about volume Concentration of 5% to 15%, ignition temperature is 540°C

Method used

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  • Coal mill primary air control logic optimization method
  • Coal mill primary air control logic optimization method

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Embodiment 1

[0026] refer to figure 1 , which is the first embodiment of the present invention, which provides a method for optimizing primary air control logic of a coal mill, including:

[0027] S1: Sum the actual value of the inlet temperature of the coal mill and the set value of the inlet temperature of the coal mill, and input the operation result to the signal judgment module, and the output of the signal judgment module is input to the RS trigger through the Set terminal.

[0028] like figure 1 As shown in the figure, the actual value of the inlet temperature of the coal mill and the set value of the inlet temperature of the coal mill are summed, and the calculation result is input to the signal judgment module (H / L).

[0029] S2: When the actual value of the inlet temperature of the coal mill is greater than the set value of the inlet temperature of the coal mill, the RS trigger sends the first signal to the switching module, and the entire cold air regulating door command is swi...

Embodiment 2

[0044] In order to verify and illustrate the technical effect adopted in this method, this embodiment selects the traditional technical solution and adopts this method to carry out comparative test, and compares the test results by means of scientific demonstration to verify the real effect of this method.

[0045] like figure 2 As shown, each coal mill is equipped with a pneumatic isolation door for cold air, an electric adjustment door for cold air, a pneumatic isolation door for hot air and an electric adjustment door for hot air.

[0046] This embodiment adopts the traditional technical solution and this method respectively to figure 2 The coal mill shown was controlled to compare the performance of the traditional technical solution and this method, and the results are shown in the following table.

[0047] Table 1: Control performance comparison.

[0048] traditional technical solutions this method Outlet air temperature mode can be switched ca...

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Abstract

The invention discloses a coal mill primary air control logic optimization method, which comprises the following steps of: performing summation operation on a coal mill inlet temperature actual value and a coal mill inlet temperature set value, inputting an operation result into a signal judgment module, and inputting the output of the signal judgment module into an RS trigger through a Set end; summing the actual value of the outlet temperature of the coal mill and the set value of the outlet temperature of the coal mill, inputting an operation result into a signal judgment module, automatically performing OR operation on the output of the signal judgment module and a cold air control valve, and inputting an OR operation result into an RS trigger through a Reset end; when the actual value of the inlet / outlet temperature of the coal mill is greater than the set value of the inlet / outlet temperature of the coal mill, the RS trigger sends a first / second signal to the switching module, and the whole cold air control valve instruction is switched to an inlet / outlet air temperature mode through the switching module; by designing a coal mill inlet air temperature control mode, automatic switching is carried out when the inlet primary air temperature rises to a dangerous value, and the reliability is greatly improved.

Description

technical field [0001] The invention relates to the technical field of cold and hot air door control of coal mills, in particular to a logic optimization method for primary air control of coal mills. Background technique [0002] In the pulverizing process of the coal mill, two important parameters, the inlet air flow rate and the outlet air temperature, should be monitored, and the switch of the damper should be adjusted to change the hot air flow rate and the outlet air temperature to achieve appropriate parameter values. Keeping these two parameters stable can keep the production process of combustible air powder stable and safe. [0003] The automatic control of the hot and cold air door of the coal mill is mainly to adjust the outlet temperature of the coal mill and the air volume at the inlet of the coal mill. Each parameter has a great influence. The control principle is simply explained as follows: the set value of the inlet air volume of the coal mill and its feed...

Claims

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Application Information

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IPC IPC(8): B02C25/00
CPCB02C25/00Y02P90/02
Inventor 姚克君周曌睿咸杰朱捷
Owner HUANENG SHANGHAI SHIDONGKOU SECOND POWER PLANT
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