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Ammonia process desulfurization spraying tower system and method for determining SO2 absorption mass transfer coefficient

A technology of ammonia desulfurization and mass transfer coefficient, which is applied in the field of ammonia desulfurization flue gas, and can solve the problems of accurately reflecting the absorption process of ammonia desulfurization process, loss of ammonia volatility, and inability to truly simulate ammonia desulfurization process.

Active Publication Date: 2016-10-12
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the problems that the existing ammonia desulfurization spray tower experimental system is prone to obvious volatile loss of ammonia and ammonium sulfate aerosol escape, and cannot truly simulate the ammonia desulfurization process, and the existing ammonia desulfurization SO 2 The absorption and mass transfer coefficient cannot truly and accurately reflect the amount of SO in the ammonia desulfurization process. 2 The absorption process of the ammonia method desulfurization spray tower system and SO 2 Determination method of absorption mass transfer coefficient

Method used

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  • Ammonia process desulfurization spraying tower system and method for determining SO2 absorption mass transfer coefficient
  • Ammonia process desulfurization spraying tower system and method for determining SO2 absorption mass transfer coefficient
  • Ammonia process desulfurization spraying tower system and method for determining SO2 absorption mass transfer coefficient

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Experimental program
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Embodiment 1

[0078] 1. Ammonia desulfurization SO 2 Determination of absorption mass transfer coefficient

[0079] The ammonia method desulfurization spray tower system of the present embodiment is as figure 1 As shown, the diameter D of the spray tower is 0.3m, and the height Z of the absorption zone is 2.0m. The ammonia desulfurization spray tower system includes a spray tower body 10, the spray tower body 10 includes a demister area, a spray area and a slurry tank 11 from top to bottom, and the demist area is provided with a demister 9, A flue gas outlet is arranged above the demister 9, and the flue gas outlet is connected with the tail gas discharge pipe, and a control cabinet 13 is arranged on the tail gas discharge pipe. The spray area is provided with a spray pipe, and the water inlet of the spray pipe communicates with the bottom of the slurry tank 11 through a circulation pipe and a circulation pump 12 . The bottom of the slurry tank 11 is also connected to the air pump 8 thro...

Embodiment 2

[0155] Using the spray tower ammonia desulfurization experimental system as in Example 1, the pH of the slurry is controlled to be 5.5, and the flue gas flow rate is u g is 3.34m / s, and the liquid-gas ratio is 3L / m 3 , the experimentally measured SO at the inlet of the spray tower 2 Concentration is 360ppm, SO at the outlet of spray tower 2 Concentration is 233ppm, SO calculated by simultaneous formula (3)~(15) 2 The absorption mass transfer coefficient is 3.545kmol / (m 2 h), the calculation method is the same as in Example 1. Set the experimental conditions to pH 5.5, u g is 3.34m / s, and the liquid-gas ratio is 3L / m 3 Substitute into the established ammonia desulfurization SO 2 Mass transfer rate expression, calculated to get SO 2 The absorption mass transfer coefficient is 3.54kmol / (m 2 h), the error between the two is only 0.13%.

Embodiment 3

[0157] Using the spray tower ammonia desulfurization experimental system as in Example 1, the pH of the slurry is controlled to be 5.68, and the flue gas flow rate is u g 2.16m / s, liquid-gas ratio is 3L / m 3 , the experimentally measured SO at the inlet of the spray tower 2 Concentration is 360ppm, SO at the outlet of spray tower 2 The concentration is 183.7ppm, the SO calculated by simultaneous formula (3)~(15) 2 The absorption mass transfer coefficient is 3.75kmol / (m 2 h), the calculation method is the same as in Example 1. Set the experimental conditions to pH 5.68, u g 2.16m / s, liquid-gas ratio is 3L / m 3 Substitute into the established ammonia desulfurization SO 2 Mass transfer rate expression, calculated to get SO 2 The absorption mass transfer coefficient is 3.60kmol / (m 2 • h), the error between the two is 3.94%.

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Abstract

The invention discloses an ammonia process desulfurization spraying tower system and a method for determining SO2 absorption mass transfer coefficient, and belongs to the technical field of ammonia process flue gas desulfurization. The invention is based on the characteristics of spraying tower ammonia process flue gas desulfurization process. The pH value, gas velocity ug and liquid-gas ratio L / Q of slurry in the spraying tower are selected as parameters; absorption mass transfer coefficient ky of ammonia process desulfurization under different conditions of pH value, gas velocity ug and liquid-gas ratio L / Q are calculated; then a numerical fitting method is employed to construct an universal expression formula of absorption mass transfer coefficient ky' of ammonia process desulfurization. The SO2 mass transfer coefficient of ammonia process desulfurization obtained by the method can fully and accurately reflect the effects of process operation conditions on SO2 mass transfer absorption process, and has general applicability; the invention provides theoretical guidance to the optimization of the design and operation of ammonia process desulfurization absorption tower, and has strong practical significance and application value; and the error between the calculated result and experimental result is less than 14.77%.

Description

technical field [0001] The invention belongs to the technical field of ammonia flue gas desulfurization, more specifically, relates to an ammonia desulfurization spray tower system and SO 2 Determination method of absorption mass transfer coefficient. Background technique [0002] Sulfur dioxide (SO 2 ) is the main air pollutant second only to inhalable particulate matter in my country, but it is also an important resource. At present, the desulfurization method in my country mainly adopts the limestone-gypsum desulfurization process. , Second, because the limestone-gypsum method technology is quite mature and open abroad, and it is easy to obtain. However, the system used in this method is relatively complex, requires a lot of investment, occupies a large area, is prone to secondary pollution, and has high operating costs, which are unbearable for small and medium thermal power plants, thus limiting the application of this method. [0003] Ammonia desulfurization is based...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50G06F19/00
CPCB01D53/501B01D2258/0283G16C20/10
Inventor 贾勇殷李国吴胜华陈光李智芳丁希楼陈宜华戴波
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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