Method for resource utilization of fluidized bed combustion ash residues

A sulfur-fixing and ash-recycling technology, which is applied in chemical instruments and methods, water/sludge/sewage treatment, cement production, etc., can solve problems such as difficult industrial utilization, environmental pollution, and high energy consumption, and achieve improved utilization value, reduced production costs, and the effect of low processing temperature

Inactive Publication Date: 2013-04-03
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of chemical oxidants is high and it is difficult to realize industrial utilization
Chinese invention patent (ZL200910103640.4) uses sulfur-fixed ash, cement clinker, and cement as raw materials to manufacture cement cementitious material products, and solves the problem of product expansion caused by calcium sulfite and free calcium oxide through high-temperature, high-pressure steam for long-term maintenance. However, the high-pressure curing time needs more than 12 hours, the work efficiency is low, and the energy consumption is high
Chinese invention patent (ZL201010237033.X) uses lime, sulfur-fixing ash, and bauxite as raw materials to make clinker at a temperature of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Sulfur-fixed ash is a solid waste produced after sulfur-containing coal and limestone are mixed in proportion and burned in a circulating fluidized bed coal-fired boiler (CFB) at 850-900 °C to fix sulfur. The main minerals in sulfur fixation ash include calcium sulfite, limestone, quartzite, free calcium oxide and hematite, and calcium sulfate. The main chemical composition of a sulfur-fixing ash is shown in Table 1, in which free calcium oxide is 10.08%, calcium sulfite is 9.61%, and carbon particles are 10.56%.

[0031] Table 1

[0032] project

SiO 2

al 2 o 3

Fe 2 o 3

CaO

SO 3

Loss on ignition

other

Desulfurization ash

36.81

17.34

2.11

16.07

8.19

17.22

2.26

[0033] A method for resource utilization of sulfur-fixed ash, comprising the steps of:

[0034] 1) Add 100kg of sulfur-fixed ash to 100kg of water, mix it into a mortar, and then use a ball mill to perform wet grinding ...

Embodiment 2

[0041] A method for resource utilization of sulfur-fixed ash, comprising the steps of:

[0042] 1) Take 100kg of the sulfur-fixing ash with the composition shown in Example 1 and add 300kg of water, mix it into a mortar, and then use a ball mill to perform wet grinding until the particle size is 5-10 microns.

[0043] 2) The crushed ash slurry is sent to a stirring tank, and then 700kg of water is added, and the boiler flue gas (carbon dioxide) is passed into the boiler at a flow rate of 800L / min while stirring, and the calcium hydroxide in the slurry is converted into calcium carbonate precipitation , when the pH value of the solution was reduced to 7, stop the introduction of boiler flue gas.

[0044] 3) Send the slurry to a plate and frame filter press to filter, remove water, and obtain 115 kg of ash. The ash and residue are further separated by density separation, and the filtrate can be recycled as water for the above steps 1) and 2).

[0045] 4) Combine the ash obtain...

Embodiment 3

[0050] A method for resource utilization of sulfur-fixed ash, comprising the steps of:

[0051] 1) Take 100kg of the sulfur-fixed ash of Example 1 and add 300kg of water, mix and grind to 5-10 microns with a ball mill.

[0052] 2) The crushed ash slurry is sent to a stirring tank, and then 200kg of water is added, and the boiler flue gas (carbon dioxide) is passed into the boiler at a flow rate of 1000L / min while stirring, and the calcium hydroxide in the slurry is converted into calcium carbonate precipitation , when the pH value of the solution was reduced to 7, stop the introduction of boiler flue gas.

[0053] 3) Send the slurry to a plate and frame filter press to filter, remove water, and obtain 115 kg of ash. The ash and residue are further separated by density separation, and the filtrate can be recycled as water for the above steps 1) and 2).

[0054] 4) Combine the ash residue obtained in (3) above with 600kg and have a density of 1.7g / cm 3 The calcium bromide aqu...

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Abstract

The invention discloses a method for resource utilization of fluidized bed combustion ash residues. The method comprises the following steps of: mixing the fluidized bed combustion ash residues with water to obtain mortar, and crushing the mortar until the particle size is 1 to 20 micrometers; introducing flue gas of a coal-fired boiler until the pH value of the solution is lower than 7, and filtering to remove water to obtain the ash residues; mixing the ash residues with density separation liquid, collecting and separating out dross which floats on the surface layer of the solution; feeding material liquid into a centrifuge for centrifugally separating centrifugal residues of which the density is greater than that of the separation liquid; and filtering centrifugate in a filter to obtain residues, mxing the residues with the dross to obtain a mixture, activating the mixture in the absence of oxygen at a temperature of 300 to 500 DEG C, cooling and then crushing the mixture, cleaning the crushed mixture by using hydrochloric acid and water, and drying the cleaned mixture to obtain an adsorbent product. By adopting the method, adverse effects caused by calcium sulfite, unburned carbon granules and free calcium oxide on the products such as cement, concrete and the like are eliminated, and the calcium sulfite, the unburned carbon granules and other porous materials are separated from the products and used as useful waste water purification adsorbents, so that the utilization value of the fluidized bed combustion ash residues is improved.

Description

technical field [0001] The invention relates to sulfur-fixing ash, in particular to a resource utilization technology related to the ash produced in the desulfurization process in a dry furnace. Background technique [0002] Sulfur-fixed ash is a solid waste produced after sulfur-containing coal and limestone (mainly calcium carbonate) are mixed in a certain proportion and burned in a circulating fluidized bed coal-fired boiler (CFB) at 850-900 °C to fix sulfur. The main minerals in sulfur-fixing ash include calcium sulfite, limestone, quartz stone, free calcium oxide, hematite and calcium sulfate. The main minerals in fly ash are mullite, quartz and hematite and other ferrosilicon components with hydration activity, and there are less calcium sulfate and calcium sulfite in fly ash. In addition, due to the low combustion temperature of the CFB boiler, there is more incompletely burned carbon in the sulfur-fixed ash. Therefore, unlike ordinary fly ash, sulfur-fixed ash has ...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/62C02F1/28C04B7/24
CPCY02P40/10
Inventor 彭绍洪
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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