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Large-sized multiple layer coal fines furnace steam temperature control method

A technology of steam temperature and control method, which is applied in the direction of steam generation, control system, lighting and heating equipment, etc. It can solve the problems of large steam temperature control inertia, low unit efficiency, and complex system, so as to reduce the flow rate of desuperheating water and improve efficiency , Improving the effect of load response ability

Inactive Publication Date: 2008-09-10
SHANDONG ELECTRIC POWER RES INST
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for controlling the steam temperature of a large-scale multi-layer pulverized coal furnace in view of the deficiencies of the existing technology, which solves the problems of low unit efficiency, complex system, poor practicability, Difficult maintenance and high cost, large inertia of steam temperature control, etc.

Method used

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  • Large-sized multiple layer coal fines furnace steam temperature control method

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Embodiment Construction

[0018] The method for controlling the steam temperature of a large-scale multi-layer pulverized coal boiler according to the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] Taking a 300MW unit as an example, the pulverizing system is a direct blowing type, using a medium-speed roller coal mill, and the five-layer burners A, B, C, D, and E are arranged in sequence from bottom to top.

[0020] Generally, the A layer is maintained manually for stable combustion, and the E layer powder is only used when other coal mills fail. Even if it is running, it is rarely operated in an automatic way, so the system can be simplified to a 3-layer fuel regulator.

[0021] The first step, control schematic configuration.

[0022] On the basis of the original combustion control system, the corresponding control logic is added. And complete the corresponding static test to ensure that the logic is correct and the...

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Abstract

The invention discloses a method for controlling the steam temperature of a large-scale multilayer arranged pulverized coal furnace, having the steps that: after being performed with high-selective processing, the steam temperature collected on the spot above an outlet is compared with a set value corresponding to a load command to generate a control deviation value; the generated control deviation value is sent to an inlet of an adjustor for calculation to generate a control command for adjusting the flame center; and the control command is connected to offset terminals of a fuel manipulator of each layer via gain balance modules to control the fuel of each layer. The invention, by means of a method of adjusting the steam temperature through adjusting the combusting flame center of the boiler, neither needs to change a thermal system to increase unnecessary risk or economic spending, nor needs to maintain site plants so as to reduce workload of a maintainer, and in particular reduces the usage amount of desuperheating water to increase unit efficiency, so that the adjustment of the desuperheating water can be recovered to the original nature in emergency duty.

Description

Technical field: [0001] The invention relates to a method for controlling the steam temperature of a boiler, in particular to a method for controlling the steam temperature of a large-scale multi-layer pulverized coal boiler. Background technique: [0002] Steam temperature is the main parameter for the control of large coal-fired units, which has a great impact on the economy and safety of the unit. At present, there are many commonly used control methods, such as: water spray control, swing angle control, flue gas recirculation, flue tail stop Board control, etc., but there are reasons such as reduced unit efficiency, complex system, poor practicability, difficult maintenance and high cost, which makes the steam temperature adjustment of large coal-fired units a major problem that plagues the operation of generating units. Adjusting the position of the flame center can change the distance between the heat receiver and the flame center, which mainly uses radiation heat exch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B35/18
Inventor 孟祥荣
Owner SHANDONG ELECTRIC POWER RES INST
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