Fuel coal smoke low oxidation rate desulfur method

A low oxidation rate, coal-fired flue gas technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of increasing sulfur dioxide and reducing ammonium sulfate, reducing corrosion, prolonging service life, and reducing oxidation. rate effect

Inactive Publication Date: 2006-11-08
JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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Problems solved by technology

However, the ammonium sulfate market has relatively large limitations. From an economic point of view, the output of ammonium sulfate should be reduced and the output of sulfur dioxide should be increased to produce by-products such as sulfuric acid or liquid sulfur dioxide with higher market value.

Method used

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  • Fuel coal smoke low oxidation rate desulfur method
  • Fuel coal smoke low oxidation rate desulfur method

Examples

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Embodiment Construction

[0027] An example of the present invention is as follows:

[0028] A 75t / h coal-fired industrial boiler with a flue gas volume of 110,000Nm 3 / h, boiler coal consumption 18.48t / h, coal-fired total sulfur 3%, exhaust gas temperature 170°C, original dust content 6500mg / Nm 3 , ESP efficiency is 98.5%. Desulfurization tower φ4500×H24000, its structure is as follows figure 1 As shown, there are three-stage flue gas treatment sections, which are the cooling and dust removal section 1, the first-stage absorption section 2 and the second-stage absorption section 3, and each flue gas treatment section is provided with a spray device 4.

[0029] The flue gas treatment process and parameters are as follows:

[0030] Cooling and dust removal - spray and wash the flue gas entering the lower part of the tower with water, and the spray volume is 120m 3 / h, the washing liquid is 32°C boiler waste water and make-up water, the temperature of the flue gas outlet cooling and dust removal sect...

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Abstract

The invention belongs to the environmental protection technology, and relates to a method for recycling sulfur dioxide in flue gas of a coal-fired boiler, in particular to a method for desulfurization of coal-fired flue gas with a low oxidation rate. Its treatment process and parameters in the desulfurization tower are: a. Cool down and remove dust, spray and wash the flue gas entering the tower with water first, so that the temperature of the flue gas will drop to 40-50°C within 2-3 seconds; b. For the first level of absorption, use the ammonium salt absorption solution with a concentration of 500-650g / l and a pH value of 5.2-6.2 for spray absorption; c. For the second-level absorption, use a concentration of 300-500g / l and a pH value of 5.4 ~6.5% ammonium salt absorption liquid is sprayed and absorbed; d. Washing and defogging the flue gas after absorption treatment, eluting the absorption liquid entrained in the flue gas and emptying it. The invention can reduce the oxidation rate in the ammonia desulfurization process and improve the utilization value of by-products.

Description

technical field [0001] The invention belongs to the environmental protection technology, and relates to a method for recycling sulfur dioxide in flue gas of a coal-fired boiler, in particular to a method for desulfurization of coal-fired flue gas with a low oxidation rate. Background technique [0002] The flue gas produced by coal-fired boilers contains a large amount of SO that can pollute the environment 2 , must be desulfurized before it can be discharged. Among the treatment methods of coal-fired flue gas, ammonia desulfurization is one of the main methods currently used, because ammonia desulfurization can by-produce sulfur ammonia fertilizer and high-purity SO that can be used to make sulfuric acid 2 , has a better market value, and thus can reduce desulfurization costs and even make profits. [0003] The mechanism of ammonia desulfurization and sulfur dioxide recovery is as follows: [0004] 1. The main reaction of desulfurization: the reaction of sulfur dioxide a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/79B01D53/50
Inventor 徐长香罗静傅国光
Owner JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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