Coal-fired unit shutdown optimization control method and control device

A coal-fired unit, optimized control technology, applied in the direction of control system, water supply control, steam boiler components, etc., can solve the problems of power plant power consumption rate increase, unfavorable sustainable development, increase production cost, etc., to achieve reduction The power consumption rate of the plant is conducive to sustainable development and the effect of avoiding waste

Pending Publication Date: 2021-07-09
浙江浙能兰溪发电有限责任公司
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a coal-fired unit shutdown optimization control method and control device, to at least solve the above-mentioned waste of energy caused by the shutdown of the electric pump, so that the power consumption rate of the power plant increases, and the production cost is increased. Issues that are not conducive to sustainable development

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  • Coal-fired unit shutdown optimization control method and control device
  • Coal-fired unit shutdown optimization control method and control device

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Embodiment 1

[0095] This embodiment provides an optimal control method for shutting down of a coal-fired unit without an electric pump. The unit includes a first steam pump, a second steam pump, and an electric pump. The electric pump is used as a backup. To supply water to the boiler in case of abnormality, the specific operation steps are as follows:

[0096] The power plant duty chief applies to the provincial commissioner for the shutdown process, and after the provincial dispatcher agrees to shut down, it is confirmed that the coal-fired unit enters the shutdown process;

[0097] Obtain the temperature value and pressure value of the auxiliary steam main pipe. At this time, the temperature value of the auxiliary steam main pipe is greater than or equal to 250°C, and the pressure is stable at 0.5-0.6MPa, and the steam supply mode of the steam turbine is converted to the auxiliary steam main pipe alone. , cut off the gas supply pipeline of the four-stage extraction main pipe, and the sp...

Embodiment 2

[0103] In this embodiment, two 50% capacity steam pumps and one 35% capacity electric pump are set in the power plant as an example. When the normal electric pump is used to stop, the number of starts and stops is 18 times, and the unit can be obtained in the coal-burning bunker. The running time and power consumption of the electric pump during the shutdown process under the two conditions of non-burning and non-burning coal bunkers are shown in Table 1 below:

[0104]

[0105] Table 1 Running time and power consumption of the electric pump during shutdown

[0106] After adopting the non-electric pump shutdown method provided by the present invention, relevant data collection is carried out, and the data comparison table of the two shutdown modes of non-electric pump shutdown and electric pump shutdown can be obtained, as shown in Table 2 below:

[0107]

[0108]

[0109] Table 2 Data comparison table of two shutdown modes

[0110] From the parameters in Table 2, it...

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Abstract

The invention provides a coal-fired unit shutdown optimization control method and control device. A coal-fired unit comprises a boiler, a first steam pump, a second steam pump and a standby electric pump, wherein the first steam pump, the second steam pump and the standby electric pump are used for supplying water to the boiler; and the first steam pump and the second steam pump supply steam through a four-stage steam extraction main pipe and an auxiliary steam main pipe. The method comprises the steps of determining that the coal-fired unit enters a shutdown process, and switching the steam supply mode of the first steam pump and the second steam pump into the mode that steam is supplied independently through the auxiliary steam main pipe; and obtaining an operation load of the coal-fired unit and a pressure value of the auxiliary steam main pipe in real time, and adjusting the water supply amount of the first steam pump and the water supply amount of the second steam pump on the basis of the corresponding relation of the pressure value of the auxiliary steam main pipe, the operation load of the coal-fired unit and the water inlet amount of the boiler till the coal-fired unit shuts down. The coal-fired unit shutdown optimization control method and control device provided by the invention have the advantages of reducing shutdown processes, avoiding energy waste caused by using an electric feed pump during shutdown, reducing power consumption of a plant and reducing production cost.

Description

technical field [0001] The invention relates to the technical field of starting and stopping of generating sets, in particular to an optimization control method for shutting down of a coal-fired unit and an optimization control device for shutting down of a coal-fired unit. Background technique [0002] With the transformation of the national power grid and the development of the power market, the number of startups and shutdowns of generator sets is gradually increasing. In the prior art, a combination of electric pumps and steam pumps is often used for the startup and shutdown of generator sets. However, Due to the high power consumption of the electric pump, the electric pump runs for a long time during the start and stop of the generator set, and because the efficiency of the electric pump liquid couple is low in the low load stage, there are also electromechanical and transmission losses, energy conversion The efficiency is not high, resulting in a waste of energy, whic...

Claims

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Application Information

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IPC IPC(8): F22B35/00F22B37/44F22B37/47F22D5/26F22D7/08
CPCF22B35/00F22B37/47F22B37/446F22D7/08F22D5/26
Inventor 杨晓波张同喜林文辉袁鸿生何云飞肖雷郑波叶剑勇薛建军胡燕辉陈平汉方良铖林腾蟠
Owner 浙江浙能兰溪发电有限责任公司
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