Anti-implosion control method for boiler furnace and smoke system in 1045 MW thermal power generating unit by adopting three-in-one induced draft fan
A boiler furnace and thermal power unit technology, applied in the field of coal-fired boilers, can solve problems such as synchronous design and successful application of combined fans, and achieve the effects of preventing furnace implosion, obvious economy and operability, and improving reliability
Inactive Publication Date: 2014-02-12
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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[0004] So far, there are relatively many successful cases of combined transformation of induced draft fans and desulfurization booster fans in China, but there is no example of synchronous design and successful application of combined fan random groups
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[0022] The application will be further elaborated below in conjunction with the accompanying drawings and embodiments.
[0023] This embodiment takes the construction of 2×1045MW ultra-supercritical coal-fired units in the first phase of a power plant as an example:
[0024] 1. Unit overview
[0025] The first phase of a power plant construction of 2×1045MW ultra-supercritical coal-fired units, simultaneous construction of flue gas desulfurization and denitrification devices, and in August and November 2012, the main engine and desulfurization and denitrification systems successfully passed the 168-hour trial operation and then officially commercial operation. The power plant is equipped with 2 sets of HU28450-11 double-stage movable blade adjustable axial flow induced draft fan blades, 2 sets of FAF28-14-1 single-stage movable blade adjustable axial flow blower and 2 sets of PAF20-12.5-2 double Axial-flow primary fan with adjustable blades. The main relevant design paramet...
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The invention discloses an anti-implosion control method for a boiler furnace and a smoke system in a 1045 MW thermal power generating unit by adopting a three-in-one induced draft fan. The method comprises the following control parameters: (1) the normal pressure range of the boiler furnace is from minus 2,000 to 2,000 Pa; (2) when the pressure of the boiler furnace is greater than 2,000 Pa or less than minus 2,000 Pa, the upper limit or lower limit of the positive pressure or negative pressure of the boiler furnace is triggered for alarming; (3) after the last fan is stopped, the moving blade regulation of the fan is opened again through being delayed for 10-20 s or being controlled; (4) a forced draft fan or the induced draft fan is tripped to interlock corresponding induced draft fan or forced draft fan for tripping; the corresponding induced draft fan or forced draft fan has an overriding protecting function; (5) when the pressure of the boiler furnace is greater than 3,000 Pa or less than minus 3,000 Pa, higher or lower protecting actions of the positive pressure or negative pressure of the boiler furnace are triggered, and a main fuel tripping boiler MFT is triggered at the same time. The anti-implosion control method provided by the invention can guarantee safe operation of million kilowatt unit systems.
Description
technical field [0001] The invention belongs to the technical field of coal-fired boilers, and in particular relates to an anti-implosion control method for a boiler furnace and flue gas system in a 1045MW thermal power unit with a three-in-one induced draft fan. Background technique [0002] With the country's emphasis on environmental protection and increasingly stringent environmental protection policies, newly-built pulverized coal boilers are designed to install desulfurization devices and require simultaneous design, simultaneous construction, and simultaneous commissioning of desulfurization systems. In addition, adding a denitrification device to the boiler flue gas system has also been put on the agenda. [0003] The combined operation of the induced draft fan and the booster fan is a new operation mode of the desulfurization system of the newly built large-scale thermal power plant, which can effectively reduce the power consumption rate of the plant. [0004] So ...
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IPC IPC(8): F22B35/00
Inventor 李德波
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID