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Flue gas desulfurization agent, and preparation method thereof, and desulfurization method

A desulfurizer and flue gas technology, applied in the field of flue gas desulfurizer and its preparation, can solve the problems of polluting the environment, low desorption rate, slow absorption rate, etc.

Pending Publication Date: 2019-03-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
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Problems solved by technology

[0002] Acid rain formed by sulfur dioxide and other acidic gases has brought serious damage to industrial and agricultural production and seriously polluted the environment
However, the above two desulfurizers are only suitable for flue gas with no oxygen or very low oxygen content, because the above patents all contain hydroxyethyldiamine, which is prone to degradation in an oxygen atmosphere
[0005] The patent document CN101721884A discloses a flue gas desulfurization agent and a method for flue gas desulfurization. The desulfurization agent is an aqueous solution containing a main absorption component, an activator, an antioxidant component and an acid, which inhibits the above-mentioned degradation phenomenon to a certain extent. However, the desulfurization solution has the disadvantages of slow absorption rate, low desulfurization rate, low desorption rate, high desorption energy consumption and reduced absorption during recycling

Method used

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  • Flue gas desulfurization agent, and preparation method thereof, and desulfurization method

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preparation example Construction

[0027] The present invention provides the preparation method of the above-mentioned flue gas desulfurization agent, comprising: mixing the main absorbent, activator, acid and water to obtain the flue gas desulfurizer; when an antioxidant is also included, the main absorbent, the activator, The acid is added into water and mixed to obtain a flue gas desulfurizer.

[0028] Furthermore, the temperature at which the above components are mixed is 20-50°C.

[0029] The flue gas desulfurizer provided by the present invention can remove and recover sulfur dioxide gas mixed with limestone roasting kiln flue gas, blast furnace gas, natural gas, etc., remove and recover sulfur dioxide in gases such as power plant boiler flue gas, and sulfur dioxide industrial tail gas. Sulfur dioxide solution has the advantages of large absorption capacity, high purification degree, fast absorption speed, high desorption rate, and low regeneration energy consumption.

[0030] The present invention also ...

Embodiment 1

[0043] The composition of the simulated flue gas in this embodiment is calculated by volume: SO 2 : 1%; CO 2 : 5.4%; O 2 : 14.7%; H 2 O: 10.2%; CO: 1.05%; NOx: 0.05%, and the rest is nitrogen.

[0044] The preparation method of the flue gas desulfurization agent in this embodiment: 180 grams of diazabicyclooctane, 20 grams of tetraethylenepentamine, and 6 grams of dodecylhydroquinone are added to 500 ml of water, and 0.5 mol / 1 liter of sulfuric acid to adjust the pH of the solution, stir evenly, and quantify it to 1000 grams with distilled water, the pH of the solution is 4.60, so as to obtain the flue gas flue gas desulfurizer solution.

[0045] The method for removing sulfur dioxide in the flue gas in this embodiment: heat 1000 grams of the flue gas desulfurization agent solution prepared in this embodiment to 50°C, and use a micro vacuum pump to send the desulfurization agent from the upper end of the packed tower into the glass mesh ring. In the packed tower, the simu...

Embodiment 2

[0054] The composition of the simulated flue gas in this embodiment is calculated by volume: SO 2 : 6%; CO 2 : 5.4%; O 2 : 14.7%; H 2 O: 10.2%; CO: 1.05%; NOx: 0.05%, and the rest is nitrogen.

[0055] The preparation method of the flue gas desulfurization agent in this example: 280 grams of diazabicyclooctane, 20 grams of diethylenetriamine, 50 grams of tetraethylenepentamine, and 5 grams of dodecylhydroquinone were added to 500 ml In the water, adjust the pH of the solution with 0.5 mol / L sulfuric acid, stir evenly, and quantify it to 1000 g with distilled water, and the pH value of the solution is 4.70, so as to obtain a flue gas desulfurizer solution.

[0056] The method for removing sulfur dioxide in the flue gas, desorption steps, determination of absorption capacity, desorption amount and absorption rate in this embodiment are the same as those in Example 1, and the measurement results are shown in Table 1.

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Abstract

The invention belongs to the technical field of gas separation and purification, and concretely relates to a flue gas desulfurization agent, a preparation method thereof, and a desulfurization method.The technical problems to be solved by the present invention comprise low desulfurization rate and low desorption rate of existing desulfurization agents. The flue gas desulfurization agent comprises5-50 parts by weight of a main absorbent, 0.1-20 parts by weight of an activator, 25-95 parts by weight of water, and an acid; the addition amount of the acid makes the pH value of the flue gas desulfurization agent be 4.0-5.0; the main absorbent is diazabicyclooctane; and the activator is at least one selected from hydroxyethylethylenediamine, diethylenetriamine, tetraethylenepentamine, triethylenetetramine and triethylenediamine. The flue gas desulfurization agent has the advantages of good sulfur dioxide absorption effect, high absorption speed, high absorption capacity, high desorption rate and low energy consumption in desorption, and has a desorption rate of 93.91-99.56%.

Description

technical field [0001] The invention belongs to the technical field of gas separation and purification, and in particular relates to a flue gas desulfurizer, a preparation method thereof and a desulfurization method. Background technique [0002] The acid rain formed by sulfur dioxide and other acid gases has brought serious damage to industrial and agricultural production and seriously polluted the environment. With the gradual popularization of the scientific concept of development such as "circular economy, clean production, and harmonious society", the country's increasing emphasis on air pollution caused by sulfur dioxide, and the formulation and implementation of relevant environmental protection laws and regulations. On June 7, 2012, the Ministry of Environmental Protection issued a series of eight pollutant discharge standards for the iron and steel industry, covering various processes such as mining and dressing, sintering, coking, ironmaking, steelmaking, steel rol...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1481B01D53/1493B01D2252/2041B01D2252/20415B01D2252/2053B01D2258/0283
Inventor 邱正秋黎建明王建山张小龙
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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