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Thermal power plant denitration system input operation method

A technology of thermal power plants and operating methods, applied in separation methods, chemical instruments and methods, gas treatment, etc.

Active Publication Date: 2021-05-11
DATANG INT POWER GENERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the problem in the prior art that the flue gas of the generating set cannot be effectively treated during the time period from the time when the unit is connected to the grid until the flue gas temperature at the SCR inlet reaches 300°C.

Method used

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Embodiment Construction

[0015] The technical scheme of the present invention will be described in detail below in conjunction with the development hardware state of the invention in conjunction with specific examples.

[0016] 1. The invention creates the equipment basis for research and development

[0017] 1. Brief introduction of denitrification system

[0018] The urea solution is delivered to the urea solution spray gun installed in the turning chamber of the boiler through the delivery pump, metering device, and distribution device. The urea droplets sprayed from the urea solution spray gun are mixed with the flue gas, heated and decomposed into NH3, H2O and CO2. The mixture of NH3 and flue gas passes through the boiler economizer, static mixer, flue gas deflector and rectifying grid in turn, and enters the SCR reactor equipped with catalyst. Under the action of the catalyst, NH3 reacts with nitrogen oxides in the flue gas to generate harmless nitrogen and water.

[0019] The boiler is equip...

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PUM

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Abstract

The invention provides a thermal power plant denitration system input operation method, which comprises the following steps of: when a unit reaches a load of 40MW, restoring a direct injection system, initially starting a cooling fan and a dilution water pump of the direct injection system, and inputting flushing water pressure at a low level; switching a spray gun input program to manual operation, inputting the spray gun, and setting the opening degree of a spray gun flushing water electrically operated gate control valve to be 20%; similarly, putting a spray gun on the other side of a flue, conducting pilot operation of the spray gun, and keeping the opening degree of the control valve at 20% and the temperature of the spray gun not exceeding 50DEG C; when the SCR inlet smoke temperature reaches 300DEG C or above, starting urea solution and dilution water supply, adjusting the opening degree of a urea solution control valve, and controlling the flow of each spray gun to be about 260L / H; and when the opening degree of urea solution control valves on the two sides of the direct injection system is controlled to be 25-60%, controlling nitrogen oxide at an outlet of an absorption tower to be 20-30mg / m<3>. The operation method shortens the input waiting time of an SCR system, urea is input in advance, and the input rate of a denitration system is increased.

Description

technical field [0001] The invention belongs to the technical field of denitrification system control in a thermal power plant, in particular to a method for controlling input of a denitrification system in a thermal power plant. Background technique [0002] The flue gas discharged into the atmosphere by coal-fired generating units needs to be denitrified, and the NOx in the flue gas is decomposed into non-polluting N2 and H2O by selective catalytic reduction technology (SCR), and discharged into the atmosphere, avoiding the nitrogen in the flue gas Oxides pollute the environment. [0003] The operating temperature range of the SCR system catalyst is 318-420°C. If the operating temperature is higher than the maximum temperature limit of the catalyst, the catalyst will be sintered and brittle; if the operating temperature is lower than the minimum temperature limit of the catalyst, it is easy to generate ammonium salt (mainly ammonium sulfate or ammonium bisulfate) and adhe...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/90B01D53/56
CPCB01D53/8631B01D53/90B01D2258/0283
Inventor 冮明宇阙培新王强李志耀张浩军王建东
Owner DATANG INT POWER GENERATION