Sodium desulfurization ash resourceful treatment system and treatment method

A desulfurization ash and treatment system technology, applied in chemical instruments and methods, inorganic chemistry, alkali metal compounds, etc., can solve the problems of high market price of sodium bicarbonate, resource waste environment, accumulation of mirabilite ash and slag, etc., and achieve good economy value, reduce environmental pollution, and increase the effect of total nitrogen content

Pending Publication Date: 2021-09-03
张崇关
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem encountered in sodium desulfurization is that the market price of sodium bicarbonate is high, resulting in high desulfurization costs; the glauberite generated after desulfuriz

Method used

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  • Sodium desulfurization ash resourceful treatment system and treatment method
  • Sodium desulfurization ash resourceful treatment system and treatment method
  • Sodium desulfurization ash resourceful treatment system and treatment method

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specific Embodiment 1

[0034] A sodium desulfurization ash resource treatment system, such as figure 2 As shown, it includes ash slag pretreatment device, ammonium bicarbonate preparation device 100 and metathesis reactor 300, primary cooling crystallizer 510, secondary cooling crystallizer 520, ammonia distillation tower 710 and evaporative crystallization device 720, the discharge port of the ash pretreatment device and the discharge port of the ammonium bicarbonate preparation device 100 are communicated with the feed port of the metathesis reactor 300 through pipelines respectively, and the liquid outlet of the metathesis reactor 300 is connected to the The feed port of the primary cooling crystallizer 510 is connected, the liquid outlet of the primary cooling crystallizer 510 is connected with the liquid inlet of the ammonia distillation tower 710, and the liquid outlet of the ammonia distillation tower 710 is connected with the inlet of the secondary cooling crystallizer 520. The feed port is...

specific Embodiment 2

[0080] The same place in this embodiment and specific embodiment 1 will not be repeated, and the difference is:

[0081] In the treatment method, the conditions for primary cooling and crystallization are as follows: cooling with ammonia to 10~-5°C, precipitation of sodium sulfate / ammonium bicarbonate double salt, centrifugal filtration, the obtained solid sodium sulfate / ammonium bicarbonate double salt returns to double decomposition In the reaction, the solution of the separated sodium sulfate / ammonium bicarbonate double salt is the primary cooling mother liquor.

[0082] Specifically, the conditions for secondary cooling and crystallization are as follows: cooling with ammonia to 10-5°C, depositing sodium sulfate / ammonium bicarbonate double salt, centrifugal filtration, and adding the obtained solid sodium sulfate / ammonium bicarbonate double salt to step S2 In the middle reaction mother liquor and with the reaction mother liquor for primary cooling and crystallization, the ...

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Abstract

The invention discloses a sodium desulfurization ash resourceful treatment system and treatment method, and the treatment system comprises an ash pretreatment device, an ammonium bicarbonate preparation device, and a double decomposition reactor, a first-stage cooling crystallizer, a second-stage cooling crystallizer, an ammonia still and an evaporation crystallizer which are sequentially communicated through pipelines; and a gas outlet of the ammonia still is communicated with a feeding hole of the double decomposition reactor. The method comprises the following steps: performing double decomposition reaction on ash and ammonium bicarbonate to obtain sodium bicarbonate, sequentially performing primary cooling crystallization, distillation, secondary cooling crystallization and evaporation concentration on reaction mother liquor to obtain ammonium sulfate, returning double salt obtained by the primary cooling crystallization to the double decomposition reaction, returning ammonia gas and carbon dioxide obtained by the distillation to the double decomposition reaction, returning the double salt obtained by the second-stage cooling crystallization to the first-stage cooling crystallization, and returning the crystallization mother liquor to the second-stage cooling crystallization. According to the method, the total yield of sodium bicarbonate, the total conversion rate of ammonium bicarbonate and the total nitrogen content of ammonium sulfate are improved, and resource reutilization of the sodium-process desulfurization ash is realized.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a sodium method desulfurization ash treatment system and treatment method. Background technique [0002] my country's iron and steel plants, coal power plants, and coking plants emit a large amount of flue gas containing dust, sulfur dioxide, nitrogen oxides and other pollutants, which is an important source of environmental pollution. In the past 10 years, many measures have been taken to control them, and remarkable results have been achieved. It has basically reached the emission standards set by the state and fundamentally improved the atmospheric environment. [0003] In the prior art, due to the low sulfur content of these flue gases, they are very suitable for dry desulfurization by sodium bicarbonate method, and the desulfurization ash after sodium bicarbonate desulfurization is solid waste. The problem encountered in sodium desulfurization is that ...

Claims

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Application Information

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IPC IPC(8): C01D7/02C01D5/06C01D7/00
CPCC01D7/12C01D5/06
Inventor 张崇关
Owner 张崇关
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