Aminogroup smoke exhaust purification method and device thereof

A technology for ammonia and purification towers, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve problems such as easy to occur, unsolved ammonia escape loss, large ammonia escape loss, etc., to achieve effective oxidation, operation and operation Controlling safe and reliable, crystallized quality results

Inactive Publication Date: 2010-05-12
王建敏
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN1178735C discloses a combined ammonia method purification tower, including an oxidation section, a concentration section, an absorption section, a water washing section and a defogging section. That is, equivalent to 0.2-0.5 liters of liquid/Nm 3 Flue gas, too low, resulting in a large loss of ammonia escape
CN2790569Y and CN1648049A propose a combined purification tower with an ammonia recovery section, trying to solve the problem of ammoni

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  • Aminogroup smoke exhaust purification method and device thereof
  • Aminogroup smoke exhaust purification method and device thereof
  • Aminogroup smoke exhaust purification method and device thereof

Examples

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Example Embodiment

[0052] Example 1

[0053] The amino flue gas purification device and method of the present invention are applied to a flue gas purification process, and the amount of flue gas processed is 100,000 Nm 3 / h, the sulfur dioxide content in the flue gas is 3000mg / Nm 3 , The sulfur trioxide content is 50mg / Nm 3 , The hydrogen chloride content is 25mg / Nm 3 , NO 2 The content is 50mg / Nm 3 , NO content is 320mg / Nm 3 , The dust content is 80mg / Nm 3 , The flue gas temperature is 135℃.

[0054] Use as attached figure 1 In the ammonia exhaust gas purification device of the present invention shown, the washing tower 5 is a spray tower installed vertically with a diameter of 3.6 m, and the purification tower 15 is an inverse sulfur tower with a diameter of 3.6 m. The described smoke exhaust purification method is implemented as follows:

[0055] 1) The original flue gas 10 enters the scrubber 5 to cool to 55°C, removes dust, and absorbs strong acid gases such as hydrogen chloride and sulfur trioxid...

Example Embodiment

[0069] Example 2

[0070] The other conditions of the flue gas are the same as in Example 1, except that the sulfur dioxide content in the flue gas is higher, reaching 12000mg / Nm 3 , The sulfur trioxide content reaches 150mg / Nm 3 , Used as attached figure 2 The shown ammonia exhaust gas purification device of the present invention, that is, the washing tower 5 is a spray tower installed upright, the purification tower 15 is a downstream tower, and the diameter of both towers is 3.6m. The implementation steps are also the same as in Example 1.

[0071] In addition, the raw material ammonia 2 enters the oxidation tank at the lower part of the purification tower 15 with a flow rate of 628.5 kg / h, and the oxidation air 13 also enters the oxidation tank with a flow rate of 50 Nm. 3 / Min, process water 1 also enters the oxidation tank with a flow rate of 4.5m 3 / h, the diluted ammonium sulfate aqueous solution 151 is obtained and stored in the oxidation tank at the lower part of the puri...

Example Embodiment

[0077] Example 3

[0078] The other conditions of the flue gas are the same as in Example 1. image 3 The shown ammonia exhaust gas purification device of the present invention, that is, the washing tower 5 is a spray tower installed horizontally, and the purification tower 15 is a countercurrent tower with a diameter of 3.6 m and a height of 35 m. Moreover, the special feature of this embodiment is that the flue gas outlet at the top of the purification tower is directly connected with a direct exhaust chimney, and the height of the direct exhaust chimney is 60m. The implementation steps are the same as in Example 1.

[0079] In this embodiment, the purification efficiency reaches 96.5%, and the ammonia escape amount in the purified tail gas 30 is 3.5 mg / Nm 3 , The sulfur dioxide content is 98mg / Nm 3 , There is no obvious aerosol phenomenon, and the smoke plume disappears about 100m in length, and the effect is very obvious.

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Abstract

An aminogroup smoke exhaust purification method and a device thereof relate to a method and a device for eliminating aerosol and ammonia escape, wherein a purification device comprises a washing tower, a purifying tower, a washing circulation tank and a crystal growth tank. Exhaust smoke enters the washing tower for temperature reduction and strong acidic gas absorption firstly, and then enters a subsequent purifying tower for weak acidic gas absorption. The method and the device have the following characteristics: dilute aqueous solution of ammonium sulfate with concentration of 5-40% and pH of 5.3-6.3 is used in the purifying tower; dilute slurry containing ammonium sulfate crystalline solid is used in the washing tower, wherein ammonium sulfate solid content is less than 10% and pH thereof is 1.0- 4.5; in addition, the ratio of the flow rate of sulfur to the flow rate of circulating fluid in the purifying tower is 50-500 (g/h)/(m3/h), and the ratio of the flow rate of the circulating fluid in the washing tower to the flow rate of the exhaust smoke is 1.0-10.0 (l/h)/(Nm3/h). Therefore, two processes deciding aerosol formation and ammonia escape are effectively decoupled and controlled, and the operation and control of the whole purification system are safer and more reliable.

Description

technical field [0001] The invention relates to a method and device for purifying ammonia exhaust smoke, in particular to a purification method and device for producing ammonium sulfate fertilizer by recovering sulfur oxide from flue gas with ammonia as a raw material, which belongs to the technical fields of electric power, metallurgy, environmental protection and chemical industry, and is especially suitable for Smoke exhaust purification field. Background technique [0002] Acidic gaseous harmful substances contained in flue gas, especially SO 2 is the main source of acid rain. As we all know, one way to solve acid rain pollution is smoke exhaust purification. Existing smoke exhaust purification methods mainly use limestone as raw material for calcium-based purification, and its purification product is calcium sulfate (or purified gypsum), which can be used as building materials, including gypsum board and cement additives, but due to China's gypsum resources It is rel...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50
Inventor 王建敏
Owner 王建敏
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