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Device and method for simultaneously removing sulfur and mercury through paper-pulping black liquor

A technology for pulping black liquor and slurry, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems affecting enterprise development, high desulfurization operation costs, and no accurate data on the removal rate of polluted gases

Inactive Publication Date: 2016-04-06
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the current flue gas desulfurization technology is very mature, there are still problems in the application of most small and medium-sized coal-fired boilers in my country: the composition of the desulfurization slurry is single; Scale plugging and corrosion
The problem with the activated carbon adsorption method is that the utilization rate of activated carbon is low, and regeneration and recycling cannot be realized. The activated carbon after adsorbing Hg enters the ash hopper together with the fly ash, and the resource utilization of Hg-containing fly ash is severely restricted.
However, due to economic and technical reasons, it is difficult for many small and medium-sized enterprises to meet the requirements. Even if they meet the requirements, there are still some problems in the use of resources and manpower. Loss
At present, a new type of black liquor resource utilization method is to use single positive membrane electrodialysis for alkali recovery, and for the comprehensive resource utilization of black liquor, dual-mode electrodialysis can be used to recover alkali and lignin at the same time, and ultra- Membrane treatment methods such as filtration and microfiltration, but these are all in the laboratory stage, with high energy consumption and high cost
[0009] There is no lack of previous research on black liquor for flue gas desulfurization. They mainly focus on the neutralization of black liquor and other industrial wastewater by coal-fired acid flue gas. The focus is more on the composition changes of black liquor. There is no accurate data on the removal rate of polluting gases in the flue gas, especially without combining the desulfurization tower to optimize the working parameters of the simulated flue gas treatment

Method used

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  • Device and method for simultaneously removing sulfur and mercury through paper-pulping black liquor
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  • Device and method for simultaneously removing sulfur and mercury through paper-pulping black liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Using the wheat straw pulping black liquor synergistic desulfurization and mercury removal device (authorization number: 204220023U) recorded in the present invention and the authorized utility model patent respectively, the desulfurization and mercury removal experiments were carried out under the same conditions, and the experimental results were compared.

[0110] The black liquor from a paper mill was selected, and the tested components were: bromide 0.5%, chloride 3%, sulfate substances 2%, carbonate substances 3%, sulfide 0.5%, lignin compounds 8%, NaOH concentration 2%, sucrose 0.6%, dimethyl sulfone 2%, sodium gluconate 1.0%;

[0111] The flue gas comes from a thermal power plant, the flue gas SO 2 Concentration = 2700mg / m 3 ; Mercury concentration = 48ug / m 3 ;

[0112] According to SO 2 Adjust the working parameters with the concentration of Hg: cycle L / G=13L / m 3 ; Black liquor volume = 38L; slurry temperature = 12°C; air temperature = 13°C; superficial ga...

Embodiment 2

[0117] The black liquor is the black liquor of a certain paper mill described in Example 1, and the flue gas comes from a certain thermal power plant described in Example 1. Combining charts 1 and 2, it can be seen that the black liquor composition in production is different from the optimized black liquor composition content, and needs to be adjusted. Use NaBr to simulate bromide in black liquor, use NaCl to simulate chloride in black liquor, use Na 2 SO 4 Simulated sulfate substances in black liquor, with Na 2 CO 3 To simulate carbonates in black liquor, use Na 2 S simulates the sulfide in the mercury removal black liquor, uses sodium lignosulfonate to simulate the lignin compound in the pulping black liquor, conducts conditioning and tempering according to the composition content in Table 2, and then treats the flue gas.

[0118] According to SO 2 Adjust the working parameters with the concentration of Hg: cycle L / G=13L / m 3 ; Black liquor volume=38L; Slurry temperatur...

Embodiment 3

[0121] The black liquor adopts the black liquor after quenching and tempering in Example 2, and the flue gas comes from a certain boiler, SO 2 Concentration = 5000mg / m 3 , mercury concentration = 90μg / m 3 . According to SO 2 Adjust the working parameters with the concentration of Hg: cycle L / G=14L / m 3 ; Black liquor volume = 38L; slurry temperature = 11°C; air temperature = 12°C. The superficial gas velocity is 0.3m / s. It is obtained that the desulfurization efficiency=98.3%, the mercury removal efficiency=78.5%, and the emission can reach the standard.

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Abstract

The invention relates to a device and method for simultaneously removing sulfur and mercury through paper-pulping black liquor. In a reaction tower, a screen plate is arranged in the position corresponding to the position below each atomizing nozzle; a perforated plate is further arranged in the reaction tower. The device cooperates with black liquor to remove sulfur and mercury in flue gas, in order to improve the sulfur and mercury removing efficiency, the black liquor can be quenched and tempered in advance, and an oxidization agent is added in the black liquor for dilution. On the screen plates, the flue gas makes contact with a liquid membrane to form bubbles, the liquid membrane is broken, small liquid drops are generated again, and the gas and liquid contact possibility is increased; when the flue gas passes a liquid inlet guide pipe, the gas and liquid contact area and the gas and liquid contact probability are further increased; when the flue gas makes contact with the black liquor, sulfur and mercury are diffused in a gas phase body without resistance and then enter the liquid membrane; sulfur and mercury are absorbed by the black liquor, gaseous sulfur and mercury become liquid sulfur and mercury, molecular diffusion is performed in the liquid membrane, Hgp is adsorbed by a solution, meanwhile, components in the black liquor are diffused to a gas phase from a liquid phase, soluble complex components of S2-, X2- and OH- are also transferred into the gas phase, and oxidizing separation is performed after contact.

Description

technical field [0001] The invention relates to a desulfurization and mercury removal technology, in particular to a device and method for simultaneous desulfurization and mercury removal of wheat straw pulping black liquor, belonging to the technical field of environmental protection. Background technique [0002] SO 2 Hg and Hg are the most harmful air pollution faced by human beings today, which mainly come from the emission of human activities. Among the emission sources of human activities, coal combustion emissions are one of the main sources. Coal contains a variety of harmful trace elements, in addition to producing SO in the process of coal combustion 2 and NOx, mercury pollution is currently the most concerned. [0003] my country's coal-based energy structure has determined that my country's coal production and consumption have always ranked first in the world. Thermal power coal consumption consumes a large amount of coal every year, which produces a large am...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/64B01D53/50
CPCB01D53/80B01D53/507B01D53/64B01D2258/0283
Inventor 田立江李清慧尹建树王宇航王艳芳张甜甜
Owner CHINA UNIV OF MINING & TECH
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