Comprehensive utilization method of ammonium sulfate and pulverized coal ash produced by thermal power plant ammonia process

A technology of ammonia desulfurization and fly ash, which is applied in the direction of preparation/separation of aluminum sulfate, aluminum sulfur compounds, ammonia, etc., can solve the problems of excrement waste polluting the environment, achieve reduction of harmful emissions, obvious economic benefits and The effect of social benefits

Inactive Publication Date: 2008-04-09
李禹
View PDF0 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for comprehensive utilization of ammonium sulfate and fly ash produced by ammonia desulfurization in

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
  • Comprehensive utilization method of ammonium sulfate and pulverized coal ash produced by thermal power plant ammonia process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a comprehensive utilization method of ammonium sulfate and fly ash produced by ammonia desulfurization in a thermal power plant,

[0022] 1. Grinding and activating the fly ash. Grind the fly ash to 200 mesh, remove iron by magnetic force, and then roast and activate at 500°C for 0.5 hours. If you use electric dust removal fine ash, you don’t need to grind it, and you can directly remove iron and activate it;

[0023] 2. Batching, the activated fly ash fine ash is mixed evenly according to the ratio of ammonium sulfate and the aluminum oxide contained in the fly ash with a weight ratio of 4.5: 1;

[0024] 3. React. The mixture of ammonium sulfate and fly ash was subjected to solid phase reaction at 300°C for 2 hours to generate ammonia gas, aluminum sulfate and ammonium aluminum sulfate. The reaction equations involved are:

[0025] al 2 o 3 +3(NH 4 ) 2 SO 4 =Al 2 (SO 4 ) 3 +6NH 3 ↑+3H 2 O……………①

[0026] Fe 2 o 3 +3(NH 4 ) 2 SO 4 = Fe 2...

Embodiment 2

[0039] Example 2, the steps are the same as in Example 1, the difference is that in step 1, the fly ash is ground to 400 mesh, iron is removed by magnetic force, and then activated by roasting at 600° C. for 1 hour.

[0040] In step 2, the alumina contained in the ammonium sulfate and the fly ash is mixed in a ratio of 6:1 by weight,

[0041] In step 3, the mixture of ammonium sulfate and fly ash is subjected to solid phase reaction at 380°C,

[0042] In step 5, the dry reacted substance enters the leaching tank while it is hot, and is stirred and leached at 100° C. for 60 minutes.

Embodiment 3

[0043] Example 3, the steps are the same as in Example 1, the difference is that in step 1, the fly ash is ground to 300 mesh, iron is removed by magnetic force, and then activated by roasting at 550° C. for 0.8 hours.

[0044] In step 2, the aluminum oxide contained in the ammonium sulfate and the fly ash is mixed in a ratio of 5:1 by weight,

[0045] In step 3, the mixture of ammonium sulfate and fly ash is subjected to solid phase reaction at 340°C,

[0046] In step 5, the dry reacted substance enters the leaching tank while it is hot, and is stirred and leached at 90° C. for 45 minutes.

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

No PUM Login to view more

Abstract

The invention relates to a processing technic for emission produced during burning coal in a heat-engine plant, in particular to a multipurpose use method of ammonium sulphate and pulverized fuel ash produced during the ammonia process of desulfurization in the heat-engine plant. The invention solves the problems that evacuated rejectamenta produced in the heat-engine plant pollutes the environment in the prior art. The invention has the following steps: the pulverized fuel ash is milled and activated, proportioning feeding and action are performed, ammonia gas is recycled and lixiviated, silicon is removed from filtrate, and pearl alum and/or aluminium ammonium sulfate are/is produced after being crystallized. The invention has the fundamental principle that the ammonium sulphate produced by the ammonia process of desulfurization is mixed with the pulverized fuel ash, the ammonium sulphate and the pulverized fuel ash perform a solid state reaction to produce the pearl alum and release the ammonia gas. The pearl alum is used as a commodity to sale, the ammonia gas returns to a stack gas desulfurization process for periodic duty. The stack gas desulfurization and the multipurpose use method of the pulverized fuel ash are combined with each other, basic products of the chemical industry such as the pearl alum and the aluminium ammonium sulfate is produced, thereby realizing the periodic duty of the ammonia gas and the multipurpose use of the pulverized fuel ash, effectively reducing the discharging of the injurant produced in a coal-fired power plant, and having obvious economic benefit and social benefit.

Description

technical field [0001] The invention relates to a treatment technology for burning coal discharge substances in thermal power plants, in particular to a comprehensive utilization method for ammonium sulfate and fly ash produced by ammonia desulfurization in thermal power plants. Background technique [0002] The ammonia desulfurization process of thermal power plants uses ammonia gas or ammonia water as an absorbent to remove sulfur dioxide gas in flue gas. Because ammonia is a good alkaline absorbent, its alkalinity is stronger than that of calcium-based absorbents, and it is a gas-liquid or gas-gas reaction in the desulfurization process, so it has fast reaction speed, complete reaction, and high utilization rate of absorbents. , High desulfurization efficiency, simple system, small equipment size, low energy consumption, no waste water and residue discharge, desulfurization by-product ammonium sulfate can be used as a series of advantages such as agricultural fertilizers....

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): C01C1/02C01F7/74C01F7/76C05C13/00
Inventor 李禹
Owner 李禹
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

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap