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
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  • 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

Method used

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  • 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
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Example Embodiment

[0059] Example 1 The influence of residence time and molar ratio of phosphorus to potassium on the removal of gaseous potassium ions

[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 at different molar ratios of phosphorus to potassium, then pass the immersion treatment, dry sieving, and place them in a dry glass bottle for later use.

[0061] The effect of different temperature (T), residence time (t) and molar ratio of phosphorus to potassium (P / K) on the removal of gaseous potassium ions was studied on the experimental system of vertical tube furnace. The standard operating conditions in the experiment are: O 2 The concentration is 3%, and the experiment temperature is 700℃, 850℃, 900℃ and 1000℃. The standard operating conditions in the experiment are: P / K=1, the residence time is 3s respectively; at 850℃, the residence time is 1s and 3s, and the molar ratio of ...

Example Embodiment

[0070] Example 2 [NH 4 H 2 PO 4 ] Influence on the removal of gas phase KCl under flue gas atmosphere

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

[0072] The simulated temperature is selected as 700℃, 850℃, 950℃ and 1000℃, 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 set the amount of KCl in the gas phase to 4mol, and other gases are set in proportion. [NH 4 H 2 PO 4 ] From the initial 0mol up to 4mol, after simulation with the thermodynamic chemical equilibrium model Equilib in the thermodynamic simulation software FactSage, the simulation results are shown in Figure 5(a) and Figure 5(b). among them,

[0073] Figure 5(a) T=700℃;

[0074] Figure 5(b) T=85...

Example Embodiment

[0081] Example 3 Quantification at different temperatures [NH 4 H 2 PO 4 ] Influence on the removal of gas phase KCl under flue gas atmosphere

[0082] In KCl and [NH 4 H 2 PO 4 ] The amount of substance is the initial condition of P / K=0.5 to simulate the reaction at different temperatures, such as Image 6 As shown, the analysis is as follows:

[0083] With the increase of temperature, the amount of the substance in the gas phase KCl continues to increase, and the temperature above 950 ℃ rises very quickly, and at the same time the product K 2 HPO 4 The amount of the substance rises rapidly, indicating that when the temperature exceeds 950℃, [NH 4 H 2 PO 4 ] The effect of removing gas phase KCl is not obvious.

[0084] Below 900℃, [NH 4 H 2 PO 4 ] The addition of KCl can maintain the amount of gas phase KCl at a low level, which shows that [NH 4 H 2 PO 4 ] It has a strong effect on the removal of gas phase KCl.

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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

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Application Information

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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
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