Biomass gasifying coupled coal-fired boiler full-load SCR denitration system and technique

A technology for coal-fired boilers and gasification systems, applied in gasification processes, chemical instruments and methods, separation methods, etc., can solve the problems of high ammonia escape rate, poor catalyst activity, limited flue gas temperature, etc., and improve the energy structure. , the effect of increasing flue gas temperature and increasing power generation

Pending Publication Date: 2019-07-05
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, when domestic coal-fired units are operating at medium and low loads, the flue gas temperature at the inlet of the SCR reactor is less than 300°C, which is lower than the lower limit of the optimal reaction temperature of the SCR catalyst, which will lead to low denitrification efficiency, poor catalyst activity, and ammonia High escape rate, even out of operation, it is difficult to meet low NO under full load x emission requirements
[0004] At the same time, when the SCR smoke temperature is too low, side reactions will also occur on the catalyst, and the generated (NH 4 ) 2 SO 4 or NH 4 HSO 4 It will stick to the denitrification catalyst and air preheater, and absorb dust, resulting in reduced catalyst activity and blockage of air preheater, which will seriously affect the denitrification efficiency and NOx of the boiler. x Emis

Method used

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  • Biomass gasifying coupled coal-fired boiler full-load SCR denitration system and technique
  • Biomass gasifying coupled coal-fired boiler full-load SCR denitration system and technique

Examples

Experimental program
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Effect test

Embodiment 1

[0042] like figure 1 As shown, this embodiment provides a biomass gasification coupled coal-fired boiler full-load SCR denitrification system, including a biomass gasification system and a coal-fired boiler SCR denitrification system, and the biomass gasification system includes a biomass gasification Furnace 1 and coal-fired boiler 6, the gasification gas outlet of the biomass gasification furnace 1 is connected in turn with a cyclone separator 2, a cyclone dust collector 3, a heat exchanger 4 and a burner 5, and the gas outlet pipe of the heat exchanger 4 A hot gas delivery pipeline 18 connected to the coal-fired boiler 6 is also connected afterward; the SCR denitrification system of the coal-fired boiler includes a coal-fired boiler 6 and an economizer 7, and the tail of the coal-fired boiler 6 is connected to the economizer 7 device, The flue gas outlet of the economizer 7 is connected in sequence with the ammonia injection grid 8, the SCR denitrification reactor 9, the ai...

Embodiment 2

[0058] This embodiment provides an SCR denitrification process based on the full-load SCR denitrification system for biomass gasification coupled with coal-fired boilers described in Embodiment 1.

[0059] When the load of the coal-fired boiler 6 is operated below 50% (belongs to medium and low load operation), the temperature of the flue gas at the inlet of the SCR denitrification reactor 9 is only 250~270°C, which cannot reach the optimal reaction temperature of the SCR denitrification , it is necessary to add a heat source for heating the boiler flue gas. The specific process method is as follows:

[0060] After crushing and drying, the biomass is sent to the biomass circulating fluidized bed gasifier 1 through the feeding system for gasification. After the biomass is gasified, part of the dust and unreacted biomass raw materials in the gas are removed by the cyclone separator 2, and returned to the biomass circulating fluidized bed gasifier 1 through the feeding device to ...

Embodiment 3

[0064] This embodiment provides another SCR denitrification process based on the full-load SCR denitrification system for biomass gasification coupled with coal-fired boilers described in Embodiment 1.

[0065] When the load of the coal-fired boiler exceeds 50% (high load operation), the temperature of the flue gas at the entrance of the SCR denitrification reactor 9 is maintained at about 320°C, which can reach the optimal reaction temperature of the SCR denitrification. At this time, no additional Add a heat source to heat the flue gas, and the electric gate valve 16 is closed. However, the above-mentioned biomass gasification device and coal-fired boiler can be reasonably used to couple power generation, which can save coal and consume biomass resources. The specific process is as follows:

[0066] After crushing and drying, the biomass is sent to the biomass circulating fluidized bed gasifier 1 through the feeding system for gasification. After the biomass is gasified, par...

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Abstract

The invention provides a biomass gasifying coupled coal-fired boiler full-load SCR denitration system and technique. The system comprises a biomass gasifying system and a coal-fired boiler SCR denitration system. The biomass gasifying system comprises a biomass gasifying furnace and a heat exchanger. The biomass gasifying furnace is connected to the heat exchanger. The heat exchanger is connectedto the coal-fired boiler SCR denitration system. The coal-fired boiler SCR denitration system comprises a coal-fired boiler and a coal saver. The flue gas outlet of the coal saver is sequentially connected to ammonia spraying grating, a SCR denitration reactor, an air preheater, an electrostatic dust collector, a desulfurization device, and a chimney. The provided denitration system and techniquecan increase the temperature of flue gas in the denitration inlet, the feeding/transporting requirements of a low-load denitration device of a boiler can be satisfied, at the same time, a large amountof biomass is consumed, and the using of clean energy is increased.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification in coal-fired power plants, and in particular relates to a biomass gasification coupled coal-fired boiler full-load SCR denitrification system and a process method. Background technique [0002] Selective Catalytic Reduction (SCR) is the most widely used and mature flue gas denitrification technology at home and abroad. It is a post-furnace denitrification method, which uses the reducing agent NH 3 , optionally with NO x The reaction produces harmless N 2 and H 2 O. [0003] In recent years, the national environmental protection requirements have been continuously improved, and the requirements for the emission of flue gas pollutants from coal-fired power plants have become more and more stringent. The denitrification of power plants requires not only high efficiency and stability, but also the denitrification of the units during medium and low load operation, and the ability t...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01D45/16B01D50/00C10J3/82C10J3/72
CPCB01D53/8628B01D45/16B01D50/00C10J3/82C10J3/723B01D2258/0283C10J2300/0916Y02P20/129
Inventor 刘鸿飞赵雅萱常少英唐勋安鑫李明明
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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