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Industrial boiler adopting flue gas recirculation and with staggered SNCR and OFA

A technology of flue gas recirculation and staggered arrangement, which is applied in the combustion of lump fuel and gaseous fuel, the combustion of liquid fuel and gaseous fuel, the combustion of gaseous fuel and powder fuel, etc. Complete and high NOx emissions

Inactive Publication Date: 2019-04-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high NOx emission and incomplete combustion of pulverized coal in the current industrial pulverized coal boilers, the present invention further proposes an industrial boiler that adopts flue gas recirculation SNCR and OFA interlaced arrangement

Method used

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  • Industrial boiler adopting flue gas recirculation and with staggered SNCR and OFA
  • Industrial boiler adopting flue gas recirculation and with staggered SNCR and OFA

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specific Embodiment approach 1

[0022] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, the industrial boiler adopting flue gas recirculation SNCR and OFA staggered arrangement described in this embodiment, it includes a burner 1, a furnace 2, a temperature sensor 3, a primary reducing agent nozzle 4, a primary burn-off air Nozzle 5, secondary overburning air nozzle 6, secondary reducing agent nozzle 7, upward flue 8, secondary air pipe valve 9 and flue gas recirculation system, burner 1 is arranged on the front wall of furnace 2, and primary The reducing agent nozzle 4, the temperature sensor 3, and the primary overfired air nozzle 5 are sequentially arranged on the outer wall of the furnace 2 along the flue gas flow direction. The inlet of the exhaust air nozzle 6 is connected, the secondary air air pipe valve 9 is installed on the inlet of the burner secondary air duct 1-2, the upward flue 8 is connected with the furnace 2, the secondary exhaust air nozzle 6, and...

specific Embodiment approach 2

[0025] Specific implementation mode two: combination figure 1 and figure 2 To illustrate this embodiment, the flue gas recirculation system of an industrial boiler using flue gas recirculation SNCR and OFA staggered arrangement in this embodiment includes a recirculation flue gas pipeline valve 10, a recirculation flue gas pipeline 11, a recirculation flue gas The branch pipe 12, the recirculation fan 13 and the overfired air pipe valve 16, the outlet of the recirculated flue gas pipe 11 passes through the recirculated flue gas branch pipe 12 and the inlet of the primary overburned air nozzle 5 and the secondary overfired air nozzle 6 Connection, the recirculation gas pipeline valve 10 and the overfired air pipeline valve 16 are installed on the recirculation flue gas branch pipeline 12 . The amount of flue gas sent into the overfired air pipeline is adjusted through the recirculation flue gas pipeline valve 10 and the overfired air pipeline valve 16 . Other components and ...

specific Embodiment approach 3

[0026] Specific implementation mode three: combination figure 1 and figure 2To illustrate this embodiment, the burner 1 of the industrial boiler adopting flue gas recirculation SNCR and OFA staggered arrangement in this embodiment includes a primary air duct 1-1 and a secondary air duct 1-2, and the secondary air duct 1- 2 is arranged outside the primary air duct 1-1, the primary air duct 1-1 and the secondary air duct 1-2 are arranged coaxially, and their axis is perpendicular to the front wall of the furnace 2. The outlet of the recirculation flue gas pipe 11 is respectively connected with the entrances of the secondary air duct 1-2, the primary overburning air nozzle 5 and the secondary overburning air nozzle 6 through the recirculating flue gas branch pipe 12, and the recirculating flue gas branch Pipes 12 are provided with recirculation flue gas pipe valves 10 to adjust the amount of flue gas sent into each pipe. Other components and connections are the same as those i...

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Abstract

The invention discloses an industrial boiler adopting flue gas recirculation and with staggered SNCR and OFA, relates to the industrial boiler, and belongs to the field of industrial pulverized coal boiler equipment. The industrial boiler aims to solve the problems that an existing industrial pulverized coal boiler is high in NOx emission and incomplete in pulverized coal combustion. The industrial boiler comprises a combustor, a first-stage reducing agent nozzle, a temperature sensor and a first-stage over fire air nozzle, wherein the combustor is arrange on a front wall of a hearth, the first-stage reducing agent nozzle, the temperature sensor and the first-stage over fire air nozzle are sequentially arranged on the outer wall of the hearth along the flowing direction of flue gas, a fluegas recirculation system is connected with an inlet of the first-stage over fire air nozzle and an inlet of a second-stage over fire air nozzle, a secondary air pipeline valve is installed on the combustor, an upward flue is connected with the hearth, the second-stage over fire air nozzle and a secondary reducing agent nozzle are sequentially arranged on one side, close to the front wall, of theupward flue along the flowing direction of the flue gas.

Description

technical field [0001] The invention relates to an industrial boiler, in particular to an industrial boiler adopting staggered arrangement of flue gas recirculation SNCR and OFA, belonging to the field of industrial pulverized coal boiler equipment. Background technique [0002] At present, the main coal-consuming equipment in my country is power station boilers, followed by coal-fired industrial boilers. The total number of coal-fired industrial boilers is close to 600,000, and the annual coal consumption is nearly 640 million tons. The combustion method of traditional coal-fired industrial boilers is mainly based on layer combustion. Take the chain furnace as an example. When the chain furnace is running, the coal is moving while burning on the grate, and one side is on fire. During operation, the fuel layer along the length of the grate has obvious Zoning, its efficiency is not high, and NOx emissions are large. Compared with the chain furnace, the industrial pulverized ...

Claims

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Application Information

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IPC IPC(8): F23C5/08F23C9/00F23J15/00
CPCF23C5/08F23C9/003F23J15/003F23J2215/10
Inventor 陈智超严蓉王亮曾令艳李争起
Owner HARBIN INST OF TECH
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