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Chlorine dioxide oxidizing agent supply system for boiler flue gas denitration and technology thereof

A boiler flue gas and chlorine dioxide technology, applied in the field of flue gas denitrification, can solve the problems of inconvenient process design and equipment selection, unfavorable popularization and application, etc., and achieve the effect of small space occupation, convenient use and continuous supply

Active Publication Date: 2015-12-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN201420088330.6 does not provide specific chlorine dioxide generator type, and Chinese patent CN201410246700.9 (publication number CN104028103A) has adopted two kinds of chlorine dioxide generators of sodium chlorite method and electrolytic method; ClO 2 Composition of oxidant supply system and ClO 2 The transmission, storage, concentration maintenance of the solution and the way of cooperation with the denitrification process, which will affect the ClO 2 The process design and equipment selection of the oxidant supply system bring inconvenience, which is not conducive to the popularization and application of this technology

Method used

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  • Chlorine dioxide oxidizing agent supply system for boiler flue gas denitration and technology thereof
  • Chlorine dioxide oxidizing agent supply system for boiler flue gas denitration and technology thereof
  • Chlorine dioxide oxidizing agent supply system for boiler flue gas denitration and technology thereof

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Effect test

Embodiment 1

[0043] According to the boiler flue gas denitrification chlorine dioxide oxidant supply system described in Figure 1, run with the operating parameters listed in Table 1 Example 1, the concentration and pH of the chlorine dioxide oxidant solution obtained and according to Chinese patent CN201420088330.6 The data such as the denitrification effect of the denitrification device are shown in Table 2.

Embodiment 2

[0045] According to the boiler flue gas denitrification chlorine dioxide oxidant supply system described in Figure 1, run with the operating parameters listed in Table 1 Example 2, the concentration and pH of the chlorine dioxide oxidant solution obtained and according to Chinese patent CN201420088330.6 The data such as the denitrification effect of the denitrification device are shown in Table 2.

Embodiment 3

[0047] According to the boiler flue gas denitrification chlorine dioxide oxidant supply system described in Figure 1, run with the operating parameters listed in Table 1 Example 3, the concentration and pH of the chlorine dioxide oxidant solution obtained and according to Chinese patent CN201420088330.6 The data such as the denitrification effect of the denitrification device are shown in Table 2.

[0048] The data of table 2 operation result shows, the ClO that embodiment 1~3 is set 2 The target concentrations of the solutions are 300mg / L, 400mg / L and 500mg / L respectively, and the set target pHs are 5.5, 6.5 and 7 respectively. Under the operating parameters of each embodiment, when the oxidation and denitrification cycle is not started, the systems operate separately 16min, 12min and 18min can reach the respective target concentration and pH. After the oxidation and denitration cycle is started, the ClO 2 Although the solution concentration and pH are changing to a certain...

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Abstract

The invention provides a chlorine dioxide oxidizing agent supply system for boiler flue gas denitration and a technology thereof. The supply system comprises a raw material supply sub-system, a CIO2 generation sub-system, a CIO2 generation liquid extraction and dilution sub-system, an oxidizing agent circulation sub-system, a CIO2 solution denitration circulation sub-system and a detection and control sub-system. In the CIO2 generation sub-system, a ClO2 generation liquid is generated sodium chlorate and hydrochloric acid provided by the raw material supply sub-system. the CIO2 generation liquid extraction and dilution sub-system achieves adjustment of a concentration and a pH value of a CIO2 oxidizing agent solution in the oxidizing agent circulation sub-system according to control of the detection and control sub-system. The CIO2 solution denitration circulation sub-system extracts the CIO2 oxidizing agent solution from the oxidizing agent circulation sub-system and inputting a waste liquid to the oxidizing agent circulation sub-system after oxidation denitration and flue gas absorption. The provided system achieves continuous supply, concentration automatic adjustment and recycling of the CIO2 oxidizing agent during the denitration process, and the system is advantaged by small occupation space and low energy consumption.

Description

technical field [0001] The invention relates to a chlorine dioxide oxidant supply system for boiler flue gas denitrification and a process thereof in the field of flue gas denitrification. Background technique [0002] SO 2 and NO x It is the two most important air pollutants in boiler flue gas, and is an important precursor substance for air pollution such as acid rain and smog. Wet flue gas desulfurization technology (WFGD) is currently the most widely used desulfurization technology in the world due to its high efficiency and mature technology. NO emitted from the boiler x Among them, NO accounts for more than 90%, and NO is hardly soluble in water, so it is more 2 It is more difficult to remove, and the currently widely used denitrification technology is ammonia selective catalytic reduction (SCR) method. However, there are many problems in the SCR method, such as: ammonia gas is unstable and easily corrodes equipment and leaks; High operating costs, etc. These un...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/56B01D53/96C01B11/02
Inventor 李新杰谢珊李裕民于文敦
Owner NANJING UNIV OF SCI & TECH
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