Method for preparing fertilizer grade monoammonium phosphate from sulfurous gases by ammonia-process desulfurization

A technology for preparing fertilizers and gaseous ammonia, applied in the direction of separation methods, ammonium orthophosphate fertilizers, chemical instruments and methods, etc.

Active Publication Date: 2011-03-23
丁正元
View PDF9 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing fertilizer-grade ammonium phosphate by ammonia desulfurization of sulfur-containing gas, so as to solve the problem of the outlet of flue gas desulfurization products, fully recycle and utilize sulfur resources, reduce the consumption of sulfur resources and reduce the impact of sulfuric acid production on the environment. destroy

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
  • Method for preparing fertilizer grade monoammonium phosphate from sulfurous gases by ammonia-process desulfurization
  • Method for preparing fertilizer grade monoammonium phosphate from sulfurous gases by ammonia-process desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] One set of 6.5×10 in a thermal power plant 4 The kW boiler consumes 200kt of coal per year, and the average sulfur mass fraction of the coal is 3.5%. If the sulfur is recovered by the method of the present invention, 20kt of sulfuric acid can be produced every year based on a sulfur utilization rate of 93.3%.

[0032] The gas output of the boiler is 2.5×10 5 m 3 / h, temperature 180°C, flue gas dust content 50g / m 3 , SO 2 The mass fraction is 10~12g / m 3 .

[0033] Coal-fired flue gas SO 2 The emission standard is 700~1200mg / m3 . Adopt the inventive method, with ammonia desulfurization, in order to guarantee the utilization rate of ammonia, SO 2 The emission must be controlled at 100mg / m 3 Below, that is to say, the absorption rate of ammonia needs to be controlled above 98%.

[0034] To achieve this goal, the thermal power plant adopts four stages to absorb SO in the flue gas 2 . The first stage washes the flue gas with water, the inlet temperature of the wash...

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 discloses a method for preparing fertilizer grade monoammonium phosphate from sulfurous gases by ammonia-process desulfurization, which comprises the following steps: (1) adopting four stages to absorb SO2 from gases; at the first stage, washing smoke by water, removing dust slag and reducing the temperature of smoke; at the second stage, absorbing SO2 by ammonia or ammonium sulfiterepeatedly to obtain ammonium bisulfite; at the third stage, absorbing SO2 by an absorption liquid with high alkalinity continuously; and at the fourth stage, washing by clean water to recycle residual ammonia and SO2; (2) generating a monoammonium phosphate solution after acidolysis: carrying out acidolysis on the obtained ammonium bisulfite solution in the last step by phosphoric acid in an acidolysis device, producing the monoammonium phosphate solution and giving out gas SO2; (3) producing the product monoammonium phosphate: carrying out conventional dehydration, crystallization and drying processes on the monoammonium phosphate solution to obtain the monoammonium phosphate fertilizer; and (4) producing sulfuric acid with the recycled SO2. By using the method of the invention, SO2 in the sulfurous gases can be fully recycled, and meanwhile, the monoammonium phosphate fertilizer with large consumption in the market is produced. The method is applicable to the thermoelectricity enterprises, the enterprises manufacturing sulphuric acid or the enterprises sintering sulfur-containing raw ores.

Description

technical field [0001] The invention relates to the chemical purification of gas, in particular to the desulfurization of sulfur-containing gas, and also to the method for producing fertilizer-grade ammonium phosphate from the desulfurized product. Background technique [0002] As we all know, the tail gas emitted by coal-fired boilers (referred to as flue gas) contains sulfur dioxide, the tail gas produced by sulfuric acid and the waste gas from the sintering of sulfur-containing raw ore also contain sulfur dioxide, and they are collectively referred to as "sulfur-containing gases". These sulfur-containing gases need to remove the sulfur from them before they can be discharged. The commonly used desulfurization methods are limestone-gypsum method, magnesium oxide method and ammonia method. There is already a scheme for ammonia flue gas desulfurization in the Chinese patent application, such as No. CN101053743 "wet type ammonia flue gas desulfurization process and its devic...

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 Applications(China)
IPC IPC(8): B01D53/78B01D53/50C05B7/00
Inventor 丁正元吴秀平
Owner 丁正元
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