Ammonia-process desulfurization process and device

An ammonia-based desulfurization and process technology, which is applied in the field of calcination, can solve the problems of low desulfurization efficiency, high concentration, and desulfurization technology that cannot meet national standards, and achieve the effect of improving desulfurization efficiency

Inactive Publication Date: 2017-05-31
SINOWAY CARBON
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] High temperature calciner flue gas contains SO 2 High concentration, SO 2 Concentration up to 18000mg / Nm 3 -42800 mg / Nm 3 At present, the commonly used desulfurization technology cannot meet the national standard. After investigation, demonstration and test, ammonia desulfurization can meet the national standard.
[0004] The existing desulfurization processes such as calcium method and double alkali method have low desulfurization efficiency and cannot meet the emission standards of environmental protection requirements in 2020

Method used

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  • Ammonia-process desulfurization process and device

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Embodiment

[0026] Embodiment, an ammonia desulfurization process, comprising the following steps:

[0027] a. High-sulfur calcined flue gas is passed into ammonia water, and the temperature of high-sulfur calcined flue gas is controlled at about 110°C when it enters the desulfurization tower, which plays a good role in controlling ammonia escape. It reacts with aqueous ammonia solution, and ammonia water removes SO in the flue gas 2 Absorb, remove SO 2 , the standard flue gas is discharged from the chimney;

[0028] b. Ammonia and SO 2 The reaction obtains an aqueous solution of the desulfurization intermediate product ammonium sulfite or ammonium bisulfite;

[0029] c. Bubble compressed air into the desulfurization intermediate product to carry out the oxidation reaction of ammonium sulfite, and directly oxidize ammonium sulfite into ammonium sulfate solution;

[0030] d, the ammonium sulfate solution is concentrated to obtain ammonium sulfate slurry with a solid content of about 10%...

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Abstract

The invention discloses an ammonia-process desulfurization process and device. The ammonia-process desulfurization process comprises the following steps: introducing high-sulfur calcinations flue gas into ammonia water, controlling the temperature to about 110 DEG C when the high-sulfur calcinations flue gas enters a desulfurization tower so as to react with an ammonia water solution, absorbing SO2 in the flue gas by the ammonia water, and removing SO2. An ammonia-process desulfurization device comprises an oxidization section, wherein a concentration section is arranged above the oxidization section; an absorption section is arranged above the concentration section; a chimney is arranged above the absorption section; the concentration section comprises a tube side and a shell side, wherein the absorption section communicates with the shell side of the concentration section; the absorption section mutually communicates with the oxidization section; the oxidization section communicates with the concentration section; and the tube side of the concentration section communicates with a post-treatment system. With the adoption of the technical scheme, SO2 outlet concentration is reduced; and the ammonia-process desulfurization process is used, so that SO2 inlet concentration of the flue gas is 18000 mg / Nm<3>, and outlet concentration is 50 mg / Nm<3> or lower.

Description

technical field [0001] The invention relates to the technical field of calciner flue gas desulfurization, in particular to a [0002] Ammonia desulfurization process and device for furnace flue gas desulfurization. Background technique [0003] High temperature calciner flue gas contains SO 2 High concentration, SO 2 Concentration up to 18000mg / Nm 3 -42800 mg / Nm 3 At present, the commonly used desulfurization technology cannot meet the national standard. After investigation, demonstration and test, ammonia desulfurization can meet the national standard. [0004] The existing desulfurization processes such as the calcium method and the double-alkali method have low desulfurization efficiency and cannot meet the emission standards for environmental protection in 2020. Contents of the invention [0005] The technical problem to be solved by the present invention is to provide a method capable of realizing high-concentration SO 2 The effective desulfurization process rea...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/50B01D53/73C01C1/24
CPCB01D53/79B01D53/502B01D53/504B01D53/73B01D2251/2062B01D2258/0283C01C1/24
Inventor 王欣鹏
Owner SINOWAY CARBON
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