• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Procedure for the production of crystallized chemical fertilizer from the treatment and transformation of the emission of gases from combustión in thermoelectric power generation plants; which includes: - the recovery of nitrogen oxides gases (nox) and sulfur oxides (sox) from combustión, previously treated in a scrubber in its acid forms (for example nitric and sulfuric acid) with a concentration between 0.1 molar and 3 molar; - the neutralization of the acid solution with the addition of an alkaline solution adjusting the ph between 3.0 and 7.5; - the recovery of the concentrate through an evaporation process; - the crystallization of the concentrate to produce salt crystals, and their dehydration and - the use of the salts obtained, as a low cost raw material, in the manufacture of chemical fertilizers. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2649058A1
    申请号:ES201630934
    申请日:2016-07-08
    公开日:2018-01-09
    发明作者:Sergio TUSET MÉNDEZ；Julien Stanislas Aimé RZEPKOWSKI
    申请人:CONDORCHEM ENVITECH S L；Condorchem Envitech SL；
    IPC主号:
    专利说明:

    DESCRIPTION



    Production process of crystallized chemical fertilizer from the treatment and transformation of the emission of gases from combustion in thermoelectric power generation plants.

    Object of the invention.
     10
    The object of the present invention is a production process of crystallized chemical fertilizer using as a source of raw material some of the gases, mainly but not exclusively, nitrogen oxides and sulfur oxides, from combustion in thermoelectric power generation plants .
     fifteen
    Field of application of the invention.

    This invention is applicable to obtain economically and sustainably chemical products used as mineral fertilizers, mainly but not exclusively, sodium, potassium and ammonium nitrates and sulfates. By using a 20 raw material present and abundant in combustion gases, mainly when fossil fuels or waste derivatives (CDR) are used, which currently have no value and which also represent an environmental problem for power generation companies in the plants thermoelectric plants; for example, although not in a limiting manner during combustion 25 occurring in conventional cycle plants.

    State of the art

    The thermoelectric plants allow the generation of electrical energy from 30 energy in the form of heat. Energy is generated by combustion of fossils such as coal, oil or natural gas.

    Due to the combustion process, the waste generated is emitted into the atmosphere. For example, in the case of coal combustion, in addition to carbon dioxide and carbon monoxide emissions, nitrogen and sulfur oxides (NOx and SOx) are emitted.
     5
    In compliance with environmental regulations, these emissions must be treated at levels acceptable by regulations, for which various physical and chemical procedures are used, whether they are oxidation and / or reduction. The reason for this patent is not to claim treatment processes that are in the public domain. 10

    The objective of the invention is focused on the use of nitrogen and sulfur compounds, as examples in the form of NO2, NO3 and SO2 and SO3, subsequent to the oxidation processes of NOx and SOx gases.
     fifteen
    The applicant of the present invention is unaware of the existence of a background that allows the recovery of residual products from power generation systems in thermoelectric plants with the characteristics of the present invention.
     twenty
    Description of the invention

    The invention relates to a method of producing crystallized chemical fertilizer from the treatment and transformation of the emission of gases from combustion in thermoelectric power generation plants. 25

    The process begins with the absorption in a scrubber that uses acidified water by dissolving the gases generically known by NOx and SOx, which have previously been oxidized chemically or physically by widely known and used procedures; As an example we cite the use of hydrogen peroxide and ozone, these oxidants manage to raise the maximum degree of oxidation of these gaseous substances and make them soluble in water and form nitric and sulfuric acid in the liquid phase.

    The acid solution is maintained between 0.1 molar and 3 molar, providing a volume of fresh water to the scrubber with the consequent overfilling and evacuation through the overflow. This solution is sent to a neutralization tank where an alkaline solution is added in the form of sodium, potassium or ammonium hydroxide, adjusting the pH between 3.0 and 7.5.

    The neutralized solution is concentrated by thermal methods by means of an evaporation process and its subsequent crystallization either by heat concentration process or by cooling to produce salt crystals. These salts may be dehydrated by centrifugation, filtration or natural drying or forced air.

    The process contemplates the use of the salts obtained, as a low cost raw material, in the manufacture of chemical fertilizers.
     fifteen
    Description of the figures.

    To complement the description that is being made and in order to facilitate the understanding of the characteristics of the invention, a set of figures is attached to the present specification in which, as an illustration and not as a limitation, the following has been represented :

    - Figure 1 shows a diagram with the different phases or stages of the production process of crystallized chemical fertilizer originating from combustion gases in thermoelectric power generation plants. 25

    Preferred embodiment of the invention.

    The steps of the procedure described above have been schematically represented in Figure 1, including:

    a) The recovery of nitrogen oxides (NOx) and sulfur oxides (SOx) gases, originating from combustion, previously treated in a scrubber in
    its acid forms (for example nitric and sulfuric acid) with a concentration between 0.1 molar and 3 molar;

    b) The neutralization of acids in a tank with an alkaline solution; for example: sodium, potassium or ammonium hydroxide, adjusting the pH between 3.0 and 7.5 5

    c) the recovery of the concentrate, by thermal methods, by a process of evaporation of the neutralized solution;

    d) crystallization of the concentrate, by a process of concentration by heat or by cooling to produce salt crystals, and its dehydration by centrifugation, filtration or natural drying or forced air and;

    e) the use of the salts obtained, as a low cost raw material, in the manufacture of chemical fertilizers. fifteen

    Once the nature of the invention has been sufficiently described, it is stated for the appropriate purposes that changes may be introduced therein, provided that this does not imply an alteration of the essential features of the invention claimed in continuation. twenty
    权利要求:
    Claims (1)
    [1]

    1. Procedure for producing crystallized chemical fertilizer from the treatment and transformation of the emission of gases from combustion in thermoelectric power generation plants, characterized in that it comprises:
    a) the recovery of nitrogen oxides (NOx) and sulfur oxides (SOx) gases, originating from combustion, previously treated in a scrubber in its acidic forms (for example nitric and sulfuric acid) with a concentration of 10 between 0.1 molar and 3 molar,
    b) neutralization of the acid solution with the addition of an alkaline solution by adjusting the pH between 3.0 and 7.5;
     fifteen
    c) the recovery of the concentrate, by thermal methods, by a process of evaporation of the neutralized solution;
    d) the crystallization of the concentrate by a heat concentration or cooling process to produce salt crystals, and its dehydration 20 by centrifugation, filtration or natural drying or forced air and;
    e) the use of the salts obtained, as a low cost raw material, in the manufacture of chemical fertilizers.
     25


     30

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    同族专利:
    公开号 | 公开日
    ES2649058B1|2018-10-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4039304A|1974-06-28|1977-08-02|Walther & Cie Aktiengesellschaft|Method of removing SO2 and/or other acid components from waste gases|
    US4039304B1|1974-06-28|1987-01-20|
    US4035470A|1974-11-02|1977-07-12|Fuji Kasui Engineering Co., Ltd.|Process for removing sulfur oxides and/or nitrogen oxides from waste gas|
    US4541999A|1982-05-29|1985-09-17|Backau-Walther Aktiengesellschaft|Method for removing acidic components including nitrogen oxide from waste gases|
    EP1040863A2|1999-03-15|2000-10-04|Cannon Technology, Inc.|Process for removing NOx and SOx from exhaust gas|
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