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Gypsum crystallization regulator suitable for wet type calcium-based flue gas desulphurization poisoning slurry

A technology of crystallization regulator and gypsum, which is applied to the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve problems such as decline, waste of resources, device reliability, etc., and achieve the effect of increasing stability and ensuring utilization rate

Inactive Publication Date: 2014-11-19
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Slurry poisoning is a recognized problem in the operation of wet flue gas desulfurization process. At present, there is no effective solution. Most of them are solved by replacing the slurry in the absorption tower, resulting in a large waste of resources and a decrease in device reliability.

Method used

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  • Gypsum crystallization regulator suitable for wet type calcium-based flue gas desulphurization poisoning slurry
  • Gypsum crystallization regulator suitable for wet type calcium-based flue gas desulphurization poisoning slurry
  • Gypsum crystallization regulator suitable for wet type calcium-based flue gas desulphurization poisoning slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the above process (see attached manual figure 1), to simulate the preparation of flue gas at the tail of a thermal power plant boiler, the mass flow rate of flue gas is 8kg / h (volume flow rate 6.31Nm 3 / h), O in flue gas 2 Volume content 10%, N 2 The volume content is 89.9%, SO 2 The content is 1000mg / m 3 , The constant temperature temperature controller stabilizes the temperature of the slurry in the reactor at about 40°C, and the stirring rate is 100r / min. With the limestone that purity is 98.5% as desulfurizer, its mass percent concentration is 2.5%, and initial slurry volume is 4L, and concentration is the greasy dirt of 1000mg / L, the heavy gold ion salt solution of 0.15mol / L (Fe 3+ , Mg 2+ 、Al 3+ ) is pumped into the reactor by a peristaltic pump, so that the volume of the slurry in the reactor is increased to 5L. After mixing evenly, the oil pollution concentration in the reactor is 200mg / L, and the heavy gold ion concentration is 0.03mol / L (Fe...

Embodiment 2

[0028] According to the flow process of embodiment 1, the flue gas at the tail of a certain thermal power plant boiler is simulated and prepared, and the flue gas mass flow rate is 8kg / h (volume flow rate 6.31Nm 3 / h), O in flue gas 2 Volume content 10%, N 2 The volume content is 89.9%, SO 2 The content is 1000mg / m 3 , The constant temperature temperature controller stabilizes the temperature of the slurry in the reactor at about 40°C, and the stirring rate is 100r / min. With the limestone that purity is 98.5% as desulfurizer, its mass percent concentration is 2.5%, and initial slurry volume is 4L, and concentration is the greasy dirt of 1000mg / L, the heavy gold ion salt solution of 0.15mol / L (Fe 3+ , Mg 2+ 、Al 3+ ) is pumped into the reactor by a peristaltic pump, so that the volume of the slurry in the reactor is increased to 5L. After mixing evenly, the oil pollution concentration in the reactor is 200mg / L, and the heavy gold ion concentration is 0.03mol / L (Fe 3+ , Mg...

Embodiment 3

[0030] According to the flow process of embodiment 1, the flue gas at the tail of a certain thermal power plant boiler is simulated and prepared, and the flue gas mass flow rate is 8kg / h (volume flow rate 6.31Nm 3 / h), O in flue gas 2 Volume content 10%, N 2 The volume content is 89.9%, SO 2 The content is 1000mg / m 3 , The constant temperature temperature controller stabilizes the temperature of the slurry in the reactor at about 40°C, and the stirring rate is 100r / min. With the limestone that purity is 98.5% as desulfurizer, its mass percent concentration is 2.5%, and initial slurry volume is 4L, and concentration is the greasy dirt of 1000mg / L, the heavy gold ion salt solution of 0.15mol / L (Fe 3+ , Mg 2+ 、Al 3+ ) is pumped into the reactor by a peristaltic pump, so that the volume of the slurry in the reactor is increased to 5L. After mixing evenly, the oil pollution concentration in the reactor is 200mg / L, and the heavy gold ion concentration is 0.03mol / L (Fe 3+ , Mg...

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Abstract

The invention discloses a gypsum crystallization modifier suitable for wet type calcium-based desulphurization of a thermal power generating unit, and the gypsum crystallization modifier can effectively eliminate the impact of heavy metal ions and oil contaminations in gypsum slurry on gypsum crystallization process to obtain gypsum crystals with coarse and large particles and low water content, increases stability of the desulfurization system, and belongs to the technical field of environmental protection. The gypsum crystallization modifier comprises the following components by weight: 0.1-5% of an oil-removing agent, 85-95% of a metal complexing agent and 5-10% of a surfactant, and is characterized in that the gypsum crystallization modifier can be directly added into an absorption tower or an absorption tower filtrate pit, then mixed evenly and dissolved for pumping. The gypsum crystallization modifier can accelerate the oxidation of sulfites and the gypsum crystallization process, is appropriate to improve the efficiency of the desulfurization system. In the embodiment, the gypsum crystallization modifier concentration is increased from 0% to 0.1%, the by-product gypsum purity is improved from 78% to 93%, the gypsum water content is reduced from 19% to 10%, the crystal size distribution is more uniform, acicular gypsum crystals are decreased, rhombic crystal share and columnar crystal share increase, the crystal specific surface area increases, and the gypsum dewatering performance is better.

Description

technical field [0001] The invention belongs to the category of wet calcium-based flue gas desulfurization gypsum quality control, and belongs to the technical branch of environmental protection—the field of air pollutant emission control in thermal power plants. Background technique [0002] Wet calcium-based desulfurization has the advantages of mature technology, high desulfurization efficiency, and strong adaptability to coal types. It is currently the mainstream process in the field of flue gas desulfurization. According to the statistics of the State Environmental Protection More than 3,000 sets of desulfurization facilities have been installed, more than 85% of which adopt limestone / gypsum wet flue gas desulfurization technology, and the total output of by-product gypsum has increased rapidly from 5 million tons in 2005 to 56 million tons in 2011. However, because the power plant burns a large amount of low-quality coal, the boiler does not burn well and produces a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 张东平
Owner NANJING INST OF TECH
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