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

Method for removing gas-phase potassium ions in biomass flue gas by utilizing ammonium phosphate

A technology of ammonium phosphate salt and biomass, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of excessive ammonium sulfate spraying, and achieve the effect of avoiding ash accumulation and corrosion, and solving ash accumulation

Active Publication Date: 2013-08-21
SHANDONG UNIV
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ammonium sulfate can sulfate KCl, and ammonium ions are effective for NO x It plays a reducing role, but the injection of ammonium sulfate needs to be excessive, mainly because SO 2 and SO 3 Equilibrium concentration exists in the flue gas and produces new SO2 emissions

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 removing gas-phase potassium ions in biomass flue gas by utilizing ammonium phosphate
  • Method for removing gas-phase potassium ions in biomass flue gas by utilizing ammonium phosphate
  • Method for removing gas-phase potassium ions in biomass flue gas by utilizing ammonium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The impact of embodiment 1 residence time and phosphorus-potassium mol ratio on gas-phase potassium ion removal

[0060] Ammonium dihydrogen phosphate [NH 4 h 2 PO 4 ] as an example, weigh a certain amount of ammonium dihydrogen phosphate and potassium chloride (KCl) and mix them according to different phosphorus-potassium molar ratios.

[0061] The effect of different temperature (T), residence time (t) and phosphorus-to-potassium molar ratio (P / K) on gas-phase potassium ion removal was studied in a vertical tube furnace experimental system. The standard working condition in the experiment is: O 2 The concentration is 3%, and the experimental temperature is 700°C, 850°C, 900°C and 1000°C. The standard working conditions in the experiment are: P / K=1, the residence time is 3s respectively; at 850°C, the residence time is 1s and 3s respectively, and the molar ratio of phosphorus and potassium is 1 and 3, and its influence on the removal of potassium ions in the gas ph...

Embodiment 2

[0070] Embodiment 2 adds the [NH of the amount of different substances 4 h 2 PO 4 ] Effects on gas phase KCl removal under flue gas atmosphere

[0071] This example uses the thermodynamic simulation software FactSage to simulate the [NH 4 h 2 PO 4 ] on the effect of gas phase KCl removal in flue gas atmosphere.

[0072] The temperature selected for the simulation is 700°C, 850°C, 950°C and 1000°C respectively, and the composition atmosphere of the flue gas is O 2 3%, CO 2 16%, H 2 O 20%, N 2 56.5%, CO 0.01%, KCl 0.004%, SO 2 0.0009%, NO 0.0086%, HCl 0.0035% and other trace gases, and the amount of KCl in the gas phase is 4mol, and other gases are set in proportion. [NH 4 h 2 PO 4 ] from the initial 0 mol to 4 mol, after using the thermodynamic chemical equilibrium model Equilib in the thermodynamic simulation software FactSage to simulate, the simulation results are shown in Figure 5(a) and Figure 5(b). in,

[0073] Figure 5(a) T=700°C;

[0074] Figure 5(b)...

Embodiment 3

[0081] Embodiment 3 quantitatively [NH at different temperatures 4 h 2 PO 4 ] Effects on gas phase KCl removal under flue gas atmosphere

[0082] In KCl and [NH 4 h 2 PO 4 ] The molar ratio of substances, that is, the initial condition of P / K=0.5, simulates the reaction at different temperatures, such as Figure 6 As shown, the analysis is as follows:

[0083] As the temperature increases, the amount of KCl in the gas phase increases continuously, and the temperature rises very quickly above 950 ° C, and at the same time, the product K 2 HPO 4 The amount of the substance decreased rapidly, indicating that when the temperature exceeds 950°C, [NH 4 h 2 PO 4 ] The removal effect of gas phase KCl is not obvious.

[0084] Below 900°C, [NH 4 h 2 PO 4 ] can keep the amount of KCl in the gas phase at a low level, which indicates that [NH 4 h 2 PO 4 ] has a strong effect on the removal of KCl in the gas phase.

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 removing gas-phase potassium ions in biomass flue gas by utilizing ammonium phosphate. The method comprises the following steps of: adding quantitative ammonium phosphate additive onto a material layer of a fire grate of a boiler or into the hearth of the boiler by virtue of a spraying device in a biomass combustion device, and carrying out a reaction on the ammonium phosphate additive as well as gas-phase potassium chloride and potassium carbonate in the flue gas at a set temperature to generate potassium phosphate, so as to remove the gas-phase potassium ions in the biomass combustion flue gas. By adopting the method for removing gas-phase potassium ions in biomass flue gas by utilizing ammonium phosphate, potassium ions in the flue gas when biomass fuel combusts can be effectively removed, the problems that ash is deposited on a biomass boiler heating surface and the biomass boiler heating surface is slagged and corroded can be avoided, and removal of NOx can be promoted by amino groups produced when ammonium phosphate is heated and decomposed.

Description

technical field [0001] The invention relates to the technical field of flue gas pollutant removal during biomass fuel combustion, in particular to a method for removing gas phase potassium ions in biomass flue gas by using ammonium phosphate. Background technique [0002] Because biomass fuel itself is rich in potassium and chlorine, no matter whether layered combustion or fluidized combustion is used for direct-fired power generation, the heating surface of the boiler will face ash accumulation, slagging and corrosion mainly caused by potassium chloride; The implementation of the "Emission Standards of Air Pollutants for Thermal Power Plants" and the revision of the "Emission Standards of Air Pollutants for Boilers", the NO of biomass boilers x Emissions will not meet the standard requirements. Because biomass ash is rich in alkali metal oxides, it is very easy to cause SCR denitrification catalyst poisoning. The co-firing of biomass and coal for power generation will undo...

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): B01D53/81B01D53/56B01D53/46C10L10/04
Inventor 韩奎华李英杰李辉齐建荟路春美
Owner SHANDONG UNIV
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