Coal quantity compensation control method based on start and stop of direct-fired pulverizing systems

A pulverizing system and compensation control technology, which is applied in the combustion method, combustion control, and fuel supply adjustment, etc., can solve the problems of different combustion efficiency of boilers and poor practical practicability in production practice, so as to improve safety, reliability and fit. High, improve the effect of stability

Pending Publication Date: 2021-12-31
华能汕头海门发电有限责任公司
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  • Claims
  • Application Information

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Problems solved by technology

However, this method is not very practical for the production practice of power generation enterprises. The reason is that the boiler combustion efficiency of the generator set is different under different powers, and the arrangement of the powder pipes that compensate for the amount of coal entering the boiler will also have a large impact on the main steam pressure and main steam temperature. These two problems have not yet been resolved in the existing method of compensation for starting and stopping coal in the pulverizing system

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  • Coal quantity compensation control method based on start and stop of direct-fired pulverizing systems
  • Coal quantity compensation control method based on start and stop of direct-fired pulverizing systems
  • Coal quantity compensation control method based on start and stop of direct-fired pulverizing systems

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Embodiment 1

[0078] see figure 2 , the present invention provides a logic control method for starting and stopping coal quantity compensation in a pulverizing system. The first embodiment is suitable for supercritical and ultra-supercritical 1000MW units. The control function of the main steam pressure of the unit is the sliding pressure curve of the full load section. Take the compensation coal amount control logic for the start and stop of the Nth set of pulverizing system as an example, including:

[0079] Step S1: Obtain the operation signals of the coal feeder and coal mill of the generator set (generally, the generator set will be equipped with six sets of pulverization systems, and each pulverization system includes a coal feeder and a coal mill), and set an appropriate delay Time (1-3 seconds), to avoid the logic malfunction caused by abnormal changes in the operation signals of the coal feeder and coal mill.

[0080] Step S2: Obtain the outage signal of the coal feeder and coal ...

Embodiment 2

[0087] see image 3 , is the second embodiment of a logic control method for starting and stopping coal quantity compensation of a pulverizing system provided by an embodiment of the present invention, and is applicable to a 600MW unit whose main steam pressure function has a constant pressure curve setting. include:

[0088] Step S1: Obtain the operation signals of the coal feeder and coal mill of the generator set (generally, the generator set will be equipped with six sets of pulverization systems, and each pulverization system includes a coal feeder and a coal mill), and set an appropriate delay Time (1-3 seconds), to avoid the logic malfunction caused by abnormal changes in the operation signals of the coal feeder and coal mill.

[0089] Step S2: Obtain the outage signal of the coal feeder and coal mill of the generator set (generally, the generator set will be equipped with six sets of pulverization systems, and each pulverization system includes a coal feeder and a coa...

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Abstract

The invention relates to the technical field of thermal power generating unit coordination control, in particular to a coal quantity compensation control method based on start and stop of direct-fired pulverizing systems. The method comprises the following steps of S1, acquiring operation signals of a coal feeder and a coal mill of a power generating unit; S2, acquiring shutdown signals of the coal feeder and the coal mill of the power generating unit; S3, calculating the fuel quantity needing to be compensated for for start and stop of each pulverizing system by analyzing the historical operation data of the power generating unit; S4, arranging a feed-forward loop on unit boiler master control logic, and superposing the fuel quantity needing to be compensated for for start and stop of each pulverizing system on the boiler master control through the boiler master control feed-forward loop; and S5, determining proper compensation data through an online pulverizing system start and stop test method in the normal operation process of the unit. By means of the coal quantity compensation logic control method based on start and stop of the pulverizing systems, the problem that the main steam pressure and main steam temperature of a current generating unit fluctuate during start and stop of the pulverizing systems is solved, and the main operation parameters of the generating unit and the safe and stable operation capability of an AGC system are effectively improved.

Description

technical field [0001] The invention relates to the technical field of coordinated control of thermal power units, and more specifically, relates to a coal quantity compensation control method based on the start and stop of a direct-blowing pulverizing system. Background technique [0002] In order to give full play to the advantages of power grid operation and meet the requirements of grid bidding, realizing and ensuring the long-term continuous and stable operation of AGC has become an important indicator in the control and assessment of large thermal power units for the power generation side. However, due to the restriction of the operation mode of the pulverizing system, even during the normal operation of the unit, the pulverizing system needs to take turns for maintenance, especially when the AGC command moves frequently, the start-stop operation of the pulverizing system will also become frequent. At present, the pulverization system of the direct blowing coal mill is...

Claims

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Application Information

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IPC IPC(8): F23N1/00B02C25/00
CPCF23N1/002B02C25/00
Inventor 蔡国忠黄旭鹏温涛王雅文蔡纯陈明光卢叙钿杨宝鄂
Owner 华能汕头海门发电有限责任公司
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