A kind of sncr denitrification system and denitrification method

A technology for denitrification and denitration agent, applied in separation methods, chemical instruments and methods, lighting and heating equipment, etc., can solve the problems of high operating cost, high ammonia escape, low NOx removal efficiency, etc. Contact area, the effect of increasing the flow rate

Inactive Publication Date: 2021-06-01
贾新华
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SCR (Selective Catalytic Reduction) uses a catalyst and has high efficiency, but the operating cost is high due to the need to update the catalyst
The reason why SNCR and SCR are often used in combination is mainly due to the low NOx removal efficiency of SNCR and the high ammonia slip

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of sncr denitrification system and denitrification method
  • A kind of sncr denitrification system and denitrification method
  • A kind of sncr denitrification system and denitrification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: 2×130t / h circulating fluidized bed boiler denitrification project of a chemical company.

[0043] Furnace flue gas volume is 340000Nm 3 / h, the original NOx emission concentration is 300~350 mg / Nm 3 . The mixed ammonia vapor enters the boiler through the nozzle group, and the nozzle group is arranged in 4 groups, of which two groups are arranged on the flue before the cyclone separator inlet, and the other two groups are arranged in the middle of the furnace, near the return point. NOx emission concentration dropped to 30mg / Nm 3 the following. The denitrification rate reaches 90%,

example 2

[0044] Example 2: A chemical company's 2×35t / h circulating fluidized bed boiler denitrification project.

[0045] Single boiler flue gas volume 50000 Nm 3 / h. NOx original emission concentration 450~480 mg / Nm 3 . The mixed ammonia vapor enters the boiler through the nozzle group, and the nozzle group is arranged in two groups, which are arranged at the lower part of the secondary air inlet of the side wall of the boiler. NOx emission concentration dropped to 30mg / Nm 3 the following. The denitrification rate is over 90%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
denitrification rateaaaaaaaaaa
denitrification rateaaaaaaaaaa
Login to view more

Abstract

The invention discloses an SNCR denitrification system and a denitrification method, comprising a first nozzle group arranged in the middle and upper part of a furnace and / or a second nozzle group connected to a flue, an ammonia liquid tank, and a mixed vaporizer. The mixing vaporizer includes ammonia liquid pipe, steam pipe, Venturi mixing pipe and vaporizing gas pipe. A three-way structure is formed between the ammonia liquid pipe, the steam pipe and the vaporizing gas pipe. The nozzle pipe adopts a casing structure, including a denitrification agent inner pipe and a cooling sleeve. The front end of the denitration agent inner pipe is provided with a Venturi atomizing tube and a nozzle arranged at the outlet end of the Venturi atomizing tube. The steam under pressure is fed into the mixed vaporizer through the steam pipe, and a negative pressure is formed when passing through the Venturi vaporization pipe, so that the denitrification agent in the ammonia liquid tank is sucked into the Venturi vaporization pipe from the ammonia liquid pipe under negative pressure; the denitrification agent and steam Mixing and heat exchange are carried out in the Venturi vaporization tube, so that the denitrification agent is vaporized; the denitrification agent vapor is sent from the vaporization gas pipe to the nozzle, and sprayed into the flue gas to remove NOx in the flue gas. The invention has the advantages of good ammonia liquid mixing and atomization effects, high denitrification efficiency and the like.

Description

technical field [0001] The invention relates to an efficient SNCR denitration system and a denitration method, belonging to the technical field of combustion flue gas treatment. Background technique [0002] Nitrogen oxides (NOx) are one of the main pollutants in the atmosphere. In my country, fossil fuels account for a high proportion of primary energy consumption. As the public's awareness of environmental protection increases, the requirements for NOx emissions in flue gas are becoming more and more stringent. In order to meet the increasingly stringent emission standards, most coal-fired flue gas denitrification adopts SNCR-SCR combined denitrification system. SNCR (Selective Non-Catalytic Reduction) does not use a catalyst, which can save investment to a certain extent, but it needs to be set in the high temperature section. SCR (Selective Catalytic Reduction) uses a catalyst and has high efficiency, but the operating cost is high due to the need to update the cataly...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/56F23J15/02
CPCB01D53/56B01D2251/2062B01D2251/2067B01D2258/0283B01D2259/124F23J15/003F23J15/02
Inventor 贾新华
Owner 贾新华
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products