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Deacidification, denitration and dust removal integrated system for flue gas of biomass boiler

A biomass boiler, denitrification and dust removal technology, applied in gas treatment, chemical instruments and methods, dispersed particle filtration, etc., can solve the problems of NOx emission concentration reaching the emission standard, complex flue gas denitrification system, high investment cost, etc., and achieve dust removal efficiency High, low operating cost, simple process

Pending Publication Date: 2021-09-28
ZHEJIANG TIANDI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the denitrification efficiency of SNCR technology is low, and it is difficult to make the NOx emission concentration meet the emission standard; SCR denitrification technology generally arranges the reactor after the bag filter and before the induced draft fan, and the flue gas temperature at the outlet of the bag filter is low, which cannot meet the requirements of SCR. Flue gas temperature requirements for denitrification, so it is necessary to install a SGH (steam heater) at the inlet of the SCR reactor to ensure that the temperature of the flue gas at the SCR inlet is not lower than 180°C, but such a flue gas denitrification system is complex, high in investment costs, and difficult to operate The process needs to consume steam, and the operation cost is high

Method used

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  • Deacidification, denitration and dust removal integrated system for flue gas of biomass boiler

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 of the present application provides a method such as figure 1 The biomass boiler flue gas deacidification, denitrification and dust removal integrated system shown in the figure divides the air preheater into two stages, which is convenient for installation, operation and maintenance; it includes: the first stage air preheater 1, the denitrification and dust removal integrated device 6 and the second stage Air preheater 7; the flue gas pipe at the outlet of the biomass boiler is connected to the flue gas inlet on the first stage air preheater 1 through the inlet flue 2 of the first stage air preheater, and the air outlet on the first stage air pre The outlet air pipe 5 is connected to the inlet air pipe of the biomass boiler; the flue gas outlet on the primary air preheater 1 is connected to one end of the outlet flue 3 of the first stage air preheater, and the other end of the outlet flue 3 of the first stage air preheater is connected to the denitrificatio...

Embodiment 2

[0028] On the basis of Embodiment 1, Embodiment 2 of the present application provides the improved device of Embodiment 1:

[0029] On the basis of embodiment one biomass boiler flue gas deacidification, denitrification and dust removal integrated system, the air outlet of the blower passes through the inlet air pipe 10 of the secondary air preheater and connects the air inlet and the The secondary air preheater bypass air pipeline 11; the secondary air preheater bypass air pipeline 11 is provided with an automatic regulating valve 18.

Embodiment 3

[0031] On the basis of Embodiment 1 and Embodiment 2, Embodiment 3 of the present application provides the working method of the biomass boiler flue gas deacidification, denitrification and dust removal integrated system:

[0032] Step 1. The air preheater at the outlet of the biomass boiler is divided into two stages. The flue gas at the outlet of the biomass boiler enters the first stage air preheater 1 through the inlet flue 2 of the first stage air preheater (tubular flue gas-air heat exchanger ) on the flue gas side, the flue gas (180°C-260°C) after heat exchange and recovery of waste heat by the primary air preheater 1 enters the denitrification and dust removal integrated device 6 through the outlet flue 3 of the primary air preheater;

[0033] Step 2: After the flue gas removes NOx and smoke dust in the denitration and dust removal integrated device 6, it enters the flue gas side of the secondary air preheater 7 from the inlet flue 8 of the secondary air preheater; the fl...

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Abstract

The invention relates to a deacidification, denitration and dust removal integrated system for flue gas of a biomass boiler. According to the deacidification, denitration and dust removal integrated system, an air pre-heater is divided into two stages, and installation, operation and maintenance are convenient. The deacidification, denitration and dust removal integrated system comprises a first-stage air pre-heater, a denitration and dust removal integrated device and a second-stage air pre-heater, wherein an outlet flue gas pipeline of the boiler is connected with a flue gas inlet in the first-stage air pre-heater through a first-stage air pre-heater inlet flue, and an air outlet in the first-stage air pre-heater is connected with an inlet air pipeline of the boiler through a first-stage air pre-heater outlet air pipeline; a flue gas outlet of the first-stage air pre-heater is connected with one end of an outlet flue of the first-stage air pre-heater, and the other end of the outlet flue of the first-stage air pre-heater is connected with a flue gas inlet of the denitration and dust removal integrated device. The deacidification, denitration and dust removal integrated system for the flue gas of the biomass boiler has the beneficial effects that the air pre-heater is divided into two stages, an optimal temperature window is provided for SCR denitration reaction, and waste heat of the flue gas is recycled to the maximum extent.

Description

technical field [0001] The invention belongs to the field of flue gas treatment, and in particular relates to an integrated system for deacidification, denitrification and dust removal of biomass boiler flue gas. Background technique [0002] As the world's fossil energy is increasingly depleted, the proportion of renewable energy in the world's energy structure is also increasing. Biomass energy is the only renewable energy that can be directly used as fuel, and it is also the only storable and stable energy source. Use of renewable energy. At present, the main utilization method of domestic large-scale, clean and efficient biomass resources is boiler direct combustion technology, which is also the most mature utilization method among various utilization methods of biomass. [0003] Due to the relatively high nitrogen content in biomass, fuel nitrogen will be converted into nitrogen oxides (NOx) during the combustion process, causing serious environmental pollution such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/40B01D46/02B01D46/00B01D53/56
CPCB01D53/8625B01D46/023B01D53/40B01D2258/0283
Inventor 葛春亮丁得龙杨一理潘超群刘寒梅张力牛会星
Owner ZHEJIANG TIANDI ENVIRONMENTAL PROTECTION TECH CO LTD