System and method for preventing ammonium bisulfate from blocking air preheater after SCR denitration modification

An air preheater and ammonium bisulfate technology, applied in preheating, combustion methods, feed water heaters, etc., can solve problems such as blockage of air preheater, ABS corrosion, etc., to avoid corrosion and ash blocking, and save coal consumption for power supply Effect

Pending Publication Date: 2018-01-30
THERMAL POWER TECH RES INST OF CHINA DATANG CORP SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a system suitable for preventing ABS from clogging the rotary air preheater after SCR denitration transformation, so as to solve the problem of ABS corrosion and air blockage caused by SCR denitration transformation in the prior art. Preheater Defects

Method used

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  • System and method for preventing ammonium bisulfate from blocking air preheater after SCR denitration modification
  • System and method for preventing ammonium bisulfate from blocking air preheater after SCR denitration modification

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Embodiment 1

[0031] Such as figure 1 As shown, the system for preventing ammonium bisulfate from clogging the air preheater after SCR denitrification transformation in this embodiment includes: passing through the coal-fired boiler 1, SCR denitrification device 2, rotary air preheater, and dust collector in sequence along the flue gas flow direction. device 11, low-pressure low-temperature economizer 12, induced draft fan 13 and chimney 14. The rotary air preheater is composed of the high temperature section 3 of the rotary air preheater and the medium temperature section 4 of the rotary air preheater. The medium temperature section 4 of the rotary air preheater is provided with an air preheater outlet flue 10 As well as the cold primary air duct 8 and the cold secondary air duct 9, the high temperature section 3 of the rotary air preheater is provided with an air preheater inlet flue 7, a hot primary air duct 5 and a hot secondary air duct 6. A primary air heater 15 and a secondary air h...

Embodiment 2

[0034] The method for preventing ammonium bisulfate from blocking the air preheater after SCR denitrification transformation in this embodiment is applicable to the system for preventing ammonium bisulfate from blocking the air preheater after SCR denitration transformation described in Example 1. The method includes: The flue gas output from the coal boiler passes through the SCR denitrification device, air preheater, dust collector, low-pressure low-temperature economizer, induced draft fan, and chimney in sequence;

[0035] An air heater is installed on the cold primary air duct of the air preheater. After the heating surface of the air preheater is reduced, when the cold primary air duct heater is not put into operation, the outlet air temperature of the hot primary air duct can reach about 230°C-240°C. Therefore, when the boiler burns coal with low moisture , the hot primary air can meet the drying output of the milling system without mixing cold air. However, when the b...

Embodiment 3

[0039] Such as figure 2 As shown, the system for preventing ammonium bisulfate from clogging the air preheater after the SCR denitrification transformation in this embodiment includes: passing through the coal-fired boiler 1, the SCR denitrification device 2, the rotary air preheater, the low-pressure Low temperature economizer 12, dust collector 11, induced draft fan 13 and chimney 14. The rotary air preheater is composed of the high temperature section 3 of the rotary air preheater and the medium temperature section 4 of the rotary air preheater. The medium temperature section 4 of the rotary air preheater is provided with an air preheater outlet flue 10 As well as the cold primary air duct 8 and the cold secondary air duct 9, the high temperature section 3 of the rotary air preheater is provided with an air preheater inlet flue 7, a hot primary air duct 5 and a hot secondary air duct 6. A primary air heater 15 and a secondary air heater 16 are respectively installed on th...

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Abstract

The invention relates to a system and method for preventing ammonium bisulfate from blocking an air preheater after SCR denitration modification. In the system, the average temperature of the overallheating surface of the air preheater is increased by cancelling the area of a cold-section heating surface of a traditional rotary air preheater, so that the ammonium bisulfate ash blocking of the airpreheater is prevented; meanwhile, the excess heat of exhaust smoke is absorbed by low-pressure and low-temperature economizers arranged in a connecting gas flue from a dust remover to an induced draft fan to control the temperature of the exhaust smoke, and the economical efficiency of a unit is improved; the control over a primary hot air temperature and a secondary hot air temperature of an outlet of the air preheater is achieved through air heaters installed on a primary cold air duct and a secondary cold air duct respectively, on the premise that it is ensured that the secondary hot airtemperature is slightly reduced, the volume of cold air mixed into the primary hot air is reduced, the temperature of the exhaust smoke of a boiler is reduced, and the boiler efficiency is improved. By means of the system, the problem that ammonium bisulfate blocks the rotary air preheater after the SCR denitration modification of the coal-fired boiler can be solved, and moreover, the net coal consumption rate can be saved by 1.1 g/kwh.

Description

technical field [0001] The invention relates to a system for preventing ammonium bisulfate from blocking an air preheater after SCR denitrification transformation. Background technique [0002] With the increasingly stringent pollutant emission standards of coal-fired power plants, selective catalytic reduction (SCR) denitrification technology is currently the most effective removal of gaseous pollutants NO in the industry. X The method is now widely used in coal-fired power plant boilers. SCR denitrification technology is based on the catalyst vanadium pentoxide (V 2 o 5 ) under the action of NH 3 As a reducing agent, the NO in the flue gas X reduced to N 2 and H 2 O. The SCR denitrification device is installed in the front flue of the air preheater after the boiler economizer. The design of SCR denitrification technology only allows 3ppm ammonia gas escape, but in the actual operation process, there is no reliable ammonia escape control method, so most of the SCR d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L15/00F22D1/00F23J15/02
CPCY02E20/34
Inventor 李皓宇刘彦鹏
Owner THERMAL POWER TECH RES INST OF CHINA DATANG CORP SCI & TECH RES INST
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