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Basic group adsorbent for capturing selenium in coal-fired flue gas and preparation method of basic group adsorbent

A technology of coal-fired flue gas and adsorbent is applied in the field of base adsorbent for capturing selenium in coal-fired flue gas and its preparation, which can solve the problem of small contact area and low effective utilization rate of solid adsorbent, which needs further exploration. and other problems, to achieve the effect of high stability, alleviation of environmental problems, and strong applicability

Inactive Publication Date: 2020-03-17
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] The adsorption method is favored by researchers for its simplicity and high efficiency. Many solid adsorbents such as activated carbon, fly ash, and metals have been used to capture selenium produced in the coal combustion process. The capture needs to be further explored, and the solid adsorbent has a small contact area and a low effective utilization rate, resulting in the disadvantage of low adsorption efficiency

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  • Basic group adsorbent for capturing selenium in coal-fired flue gas and preparation method of basic group adsorbent
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  • Basic group adsorbent for capturing selenium in coal-fired flue gas and preparation method of basic group adsorbent

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preparation example Construction

[0030] see Figure 4 , the present invention also provides a preparation method of a base adsorbent for capturing selenium in coal-fired flue gas, the preparation method mainly includes the following steps:

[0031] Step 1, Preparation of Ca(OH) 2 solution.

[0032] Specifically, Ca(OH) was weighed in a mass ratio of 0.1 to 0.5 2 powder and sodium alginate powder, the Ca(OH) 2 The powder is added to deionized water and stirred with a glass rod until completely dissolved to obtain Ca(OH) 2 solution. In this embodiment, the Ca(OH) 2 The mass of the powder was 0.05 g.

[0033] Step 2, to the Ca(OH) in several times 2 Sodium alginate powder was added to the solution and stirred to obtain a liquid-phase base adsorbent.

[0034] Specifically, although sodium alginate can be completely dissolved in most water-based systems, due to its extremely strong hydrophilicity, if it is put into water at one time and the stirring is not sufficient, the outer layer will absorb water and ...

Embodiment 1

[0040] The preparation method of the base adsorbent for capturing selenium in coal-fired flue gas provided in Example 1 of the present invention mainly includes the following steps: first, 0.05g Ca(OH) 2 The powder and 0.1g sodium alginate powder are dissolved in 100mL deionized water; when the solution is clear and transparent, pour the obtained base adsorbent into the gas washing bottle, turn on the thermostat, heating belt and other experimental instruments, and keep the temperature of the sublimation tube at 160℃±5℃, the feeding (fly ash) speed is about 0.1g / min, and the gas-phase selenium carrier gas (N 2 ) flow rate is 200ml / min, dilution gas (N 2 ) flow rate 1000ml / min, particulate carrier gas (N 2 ) flow rate was 800ml / min, and the reaction was performed for 1h. The results show that the de-selenium efficiency of the base adsorbent for capturing selenium in coal-fired flue gas obtained in Example 1 can reach 24.5%.

Embodiment 2

[0042] The preparation method of the base adsorbent for capturing selenium in coal-fired flue gas provided in Example 2 of the present invention mainly includes the following steps: first, 0.05g Ca(OH) 2 The powder and 0.5g sodium alginate powder are dissolved in 100mL deionized water; when the solution is clear and transparent, pour the obtained base adsorbent into the gas washing bottle, turn on the thermostat, heating belt and other experimental instruments, and keep the temperature of the sublimation tube at 160℃±5℃, the feeding (fly ash) speed is about 0.1g / min, and the gas-phase selenium carrier gas (N 2 ) flow rate is 200ml / min, dilution gas (N 2 ) flow rate 1000ml / min, particulate carrier gas (N 2 ) flow rate was 800ml / min, and the reaction was performed for 1h. The results show that the de-selenium efficiency of the base adsorbent for capturing selenium in coal-fired flue gas obtained in Example 2 can reach 49.9%.

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Abstract

The invention belongs to the technical field of energy and environment correlation, and discloses a basic group adsorbent for capturing selenium in coal-fired flue gas and a preparation method of thebasic group adsorbent, wherein the basic group adsorbent is a mixed solution; raw materials of the basic group adsorbent comprise calcium hydroxide powder and polymer sodium alginate powder, and the mass ratio of the calcium hydroxide powder to the polymer sodium alginate powder is 0.1-0.5; calcium hydroxide in the basic group adsorbent and acidic gas-phase SeO2 in the coal-fired flue gas are subjected to a chemical reaction to generate CaSeO3; sodium alginate in the mixed solution has a polyanion property, and is subjected to a particle exchange reaction with divalent cations in the mixed solution, a sodium alginate alpha-L-guluronic acid unit is accumulated to form a cross-linked network structure, the cross-linked network structure captures and intercepts granular selenium to form flocculate, the formed flocculate is dispersed in the mixed solution, and thus separation of selenium and flue gas is completed. According to the invention, the efficiency and applicability are improved, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field related to energy and environment, and more particularly relates to a base adsorbent for capturing selenium in coal-fired flue gas and a preparation method thereof. Background technique [0002] As fossil energy is still the most consumed energy type, and the consumption of coal is still high, the environmental problems brought about by the coal-burning process cannot be ignored. Although CO 2 , NO X and SO 2 Effective results have been achieved in the control of conventional pollutants such as arsenic, selenium, lead and other trace elements released during the combustion process. [0003] In addition, with the gradual increase of carbon emissions, the consumption of fossil energy, which has an important proportion, has gradually increased, and the environmental pollution problem has become more and more serious. According to BP energy statistics, in the three-year decline period Since then, global coal...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/46B01D49/00
CPCB01D49/00B01D53/46B01D53/78B01D2251/404B01D2251/604B01D2258/0283
Inventor 赵永椿纪禺山张军营
Owner HUAZHONG UNIV OF SCI & TECH
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