Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ammonia flue gas desulfuration and denitration combined process and device

A flue gas and process technology, applied in the direction of separation method, ammonium sulfate, climate sustainability, etc., can solve the problems of reducing oxidation rate and desulfurization efficiency, and achieve the effect of promoting denitrification, improving purity, and promoting natural oxidation rate

Inactive Publication Date: 2013-04-17
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
View PDF6 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While in solution (NH 4 ) 2 SO 3 When the concentration is high, its oxidation rate and desulfurization efficiency will be greatly reduced

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
  • Ammonia flue gas desulfuration and denitration combined process and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] In a thermal power plant, three 220t / h boilers adopt this desulfurization and denitrification process, and the liquid-gas ratio of the desulfurization tower is 8L / Nm 3 , the pH value of the desulfurization tower is controlled at 5.0-8.0, the pH value of the pre-scrubber is controlled at 2.8-3.8, the supply of lime emulsion is related to the F in the flue gas - The molar ratio is 1.3:1, the height of each layer of filler is controlled at 60cm, the hole size of the air distribution orifice is 3-5mm, and the distance between the two layers of air distribution orifice is 2m; the inlet SO 2 The concentration is 5789mg / m 3 , NO concentration is 352mg / m 3 , the flue gas temperature is 142°C, the outlet SO 2 The concentration is 25mg / m 3 , NO concentration is 12mg / m 3 , the purity of ammonium sulfate is 99.8%, and the particle size range of ammonium sulfate crystals is 1-3mm.

Embodiment 2

[0059] A self-provided power plant, one 300WM unit adopts this desulfurization and denitrification process, and the liquid-gas ratio of the desulfurization tower is 7L / Nm 3 , the pH value of the desulfurization tower is controlled at 6.5-8.0, the pH value of the pre-scrubber is controlled at 3.0-4.0, the supply of lime emulsion is related to the F in the flue gas - The molar ratio is 1.5:1, the height of each layer of filler is controlled at 50cm, the hole size of the air distribution orifice is 3-5mm, and the distance between the two layers of air distribution orifice is 2m; the inlet SO 2 The concentration is 4672mg / m 3 , NO concentration is 421mg / m 3 , the flue gas temperature is 152°C, the outlet SO 2 The concentration is 18mg / m 3 , NO concentration is 15mg / m 3 , the purity of ammonium sulfate is 99.7%, and the crystal particle size range of ammonium sulfate is 1mm-3mm.

Embodiment 3

[0061] In a power plant, two 130t / h boilers adopt this desulfurization and denitrification process, and the liquid-gas ratio of the desulfurization tower is 9L / Nm 3 , the pH value of the desulfurization tower is controlled at 6.8-7.8, the pH value of the pre-scrubber is controlled at 3.5-4.2, the supply of lime emulsion is related to the F in the flue gas - The molar ratio is 1.2:1, the height of each layer of filler is controlled at 50cm, the hole size of the air distribution orifice is 3-6mm, and the distance between the two layers of air distribution orifice is 3m; the inlet SO 2 The concentration is 2983mg / m 3 , NO concentration is 378mg / m 3 , the flue gas temperature is 137°C, the outlet SO 2 The concentration is 16mg / m 3 , NO concentration is 8mg / m 3 , the purity of ammonium sulfate is 99.2%, and the crystal particle size range of ammonium sulfate is 1mm-3mm.

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
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses an ammonia flue gas desulfuration and denitration combined process and device. The process comprises the following steps: liquid ammonia is fed into a desulfurization tower, flue gas to be processed is sprinkled and pre-washed and then fed into the desulfurization tower for sprinkling desulfuration and denitration, and the flue gas subjected to sprinkling desulfuration and denitration is demisted and dried and then discharged out of the desulfurization tower; cleaning solution in a prewashing tower and for sprinkling and washing comes from serous fluid in a tower kettle of the desulfurization tower, and meanwhile, liquid ammonia is injected into the prewashing tower to adjust the pH value of the cleaning solution to be 2-4.5; and the cleaning solution in the prewashing tower is led out and added with lime milk, liquid ammonia is injected into the cleaning solution added with lime milk to adjust the pH value to be 6.0-7.5, and then the mixture is filtered and returned to a sprinkling layer of the desulfurization tower to sprinkle and wash the flue gas. The flue gas denitration efficiency, the natural oxidation rate of (NH4)2SO3 and the purity of the by-product (NH4)2SO4 are all improved to a larger extent; and corrosion of the serous fluid to the desulfuration system is eliminated and the service life of the desulfuration equipment is prolonged.

Description

technical field [0001] The invention relates to the technical field of resource and environmental protection, in particular to a process and a device for combined desulfurization and denitrification of ammonia-based flue gas. Background technique [0002] Limestone-gypsum wet flue gas desulfurization technology has been popularized and applied on a large scale at home and abroad because of its long development time, mature technology and high desulfurization efficiency. At present, limestone-gypsum wet flue gas desulfurization devices account for 90% of the desulfurization devices built. . However, this process has obvious disadvantages. The gypsum resource reuse value of the desulfurization by-product is low. The tens of millions of tons of gypsum produced by the desulfurization of power plants in my country every year has become the main solid waste of power plants, resulting in serious secondary pollution problems. The way out of (desulfurization) gypsum has become a key ...

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
IPC IPC(8): B01D53/75B01D53/78B01D53/60B01D47/06B01D53/68C01C1/24
CPCY02C20/30Y02P70/10
Inventor 李泽清莫建松吴忠标程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com