CN205127725U - Novel reducing desulfurization absorption tower - Google Patents

Abstract

The utility model provides a new variable-diameter desulfurization absorption tower, which includes: a tower body, including from top to bottom; a demister part, a spray part, and a slurry part; the demist part and the spray part They are connected by an upper variable diameter part, and the upper variable diameter part has a diffusion variable diameter angle of 100-107°; the slurry part and the spray part are connected by a lower diameter variable part, and the lower variable diameter part The part has a contraction angle, which is 55-70°. At the same time, the cross-sectional size of the tower body above and below the spray layer can be increased through diffusion and diameter reduction, which can not only adjust the flow rate of the flue gas flowing through the demister, but also increase the capacity of the limestone slurry in the desulfurization absorption tower to ensure the circulation of the limestone slurry. The amount is sufficient, and the limestone slurry can fully contact with the sulfur-containing flue gas. It is especially suitable for using the existing desulfurization absorption tower to transform it in the situation where the site and construction conditions are limited, so that it meets the emission standards required by the current environmental protection standards.

Description

A new variable-diameter desulfurization absorption tower

technical field

The utility model relates to the field of waste gas treatment, in particular to the technical field of wet flue gas desulfurization, in particular to a novel variable-diameter desulfurization absorption tower.

Background technique

The flue gas produced by many industries contains sulfur dioxide, which combines with precipitation to form acid rain, which will seriously endanger the health of residents, corrode building materials, destroy the ecological environment, and cause huge economic losses. It has become an important environmental factor restricting my country's social and economic development. Reducing sulfur dioxide emissions, controlling atmospheric sulfur dioxide pollution, and protecting the quality of the atmospheric environment are one of the important issues of my country's environmental protection at present and for a long time to come.

According to the "Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan" (2014-2020) Fagai Energy [2014] No. 2093 document, coal-fired thermal power units should undergo environmental protection upgrades, and the discharge of major pollutants will gradually achieve ultra-low emissions. That is, under the condition of the reference oxygen content of 6%, the emission limits of soot, sulfur dioxide, and NOx are not higher than 10mg/Nm ³ , 35mg/Nm ³ , and 50mg/Nm ³ respectively. Therefore, it is very necessary to retrofit the existing environmental protection facilities with ultra-low emissions.

There are many sulfur dioxide pollution control technologies, such as improving the energy structure and using clean fuels. However, flue gas desulfurization is an irreplaceable technology for effectively reducing sulfur dioxide emissions. There are many methods for flue gas desulfurization. According to the basic principles of physics and chemistry, they can be roughly divided into three types: absorption method, adsorption method and catalytic method. Absorption method is the most important and widely used method to purify sulfur dioxide in flue gas. The absorption method is divided into dry method and wet method.

At present, wet flue gas desulfurization technology is widely used in industrial waste gas desulfurization. The principle of existing wet flue gas desulfurization is to use limestone slurry to react with sulfur dioxide in flue gas to convert sulfur dioxide into gypsum to achieve the purpose of removing sulfur dioxide in flue gas. Purpose, its principle is as follows:

Neutralization reaction: 2CaCO ₃ +H ₂ O+2SO ₂ ＝2CaSO ₃ ·1/2H ₂ O+2CO ₂

Oxidation reaction: 2CaSO ₃ ·1/2H ₂ O+O ₂ +3H ₂ O＝2CaSO ₄ ·2H ₂ O

In the field of wet flue gas desulfurization technology, in order to meet the requirements of desulfurization performance, economy and other indicators and the normal operation of the demister, the absorption tower body of the conventional desulfurization absorption tower needs to limit the design flue gas flow rate range to about 3 ~ 6m/s . The diameter of the part above the spray layer of the existing absorption tower is consistent with the diameter of the part below the spray layer. That is to say, the range of the tower diameter from the flue gas inlet to the flue gas outlet on the upper part of the demister is the same.

The flue gas design flow rate of the existing desulfurization absorption towers generally meets the requirements of the demister equipment, but does not maximize the desulfurization performance and economic indicators.

In addition, with the improvement of national environmental protection standards, the existing wet desulfurization system has the problem that the exhaust gas does not meet the standard. Therefore, it needs to be expanded and transformed, but the construction of the transformation is often limited by the site and cannot be carried out smoothly. Due to the diameter specifications of the existing desulfurization absorption towers, the emission of sulfur-containing flue gas after passing through the demister cannot meet the standard, which in turn leads to the tail gas discharged into the atmosphere containing a large amount of drop-shaped gypsum slurry, that is, the phenomenon of "gypsum rain".

Chinese utility model patent (patent number: ZL201420411946.2) discloses a desulfurization absorption tower, which connects the spray part and the demister part through the variable diameter connection part, increases the cross-sectional area of the demist part, and achieves the control of the flue gas flow rate. The purpose is to keep the mist eliminator in good working condition. However, through the above modification, the problems of insufficient circulation of limestone slurry and insufficient contact between limestone slurry and sulfur-containing flue gas cannot be solved.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a new type of variable-diameter desulfurization absorption tower. At the same time, the cross-sectional size of the tower body above and below the spray layer can be increased through diffusion and diameter-changing, that is, the flue gas flow through the desulfurization absorption tower can be adjusted. The flow rate of the mist device can also increase the capacity of the limestone slurry in the desulfurization absorption tower, ensure sufficient circulation of the limestone slurry, and enable the limestone slurry to fully contact with the sulfur-containing flue gas. It is especially suitable for using the existing desulfurization absorption tower. Reconstruction is carried out in the case of limited construction conditions to make it meet the emission standards required by the current environmental protection standards.

For reaching above-mentioned purpose, the technical mode that the utility model takes is:

A new variable-diameter desulfurization absorption tower, including:

A tower body, including from top to bottom; a defogging part, a spraying part, and a slurry part;

The demisting part and the spraying part are connected through an upper reducing part, and the upper reducing part has a diffusion reducing angle, which is 100-107°;

The slurry part and the spray part are connected by a lower diameter reducing part, and the lower diameter reducing part has a contraction and diameter reduction angle of 55° to 70°.

Further, the divergent diameter change angle is preferably 105°, and the contraction diameter change angle is preferably 64°.

Further, the height of the upper variable diameter part is 3-5 meters, and the height of the lower variable diameter part is 2-4.5 meters.

Further, the upper reducing portion is located 0.9-1.65 meters above the spraying portion.

Further, a flue gas inlet is also included, and the lower diameter reducing part is located 8-16 meters below the flue gas inlet.

Further, the spray part includes a plurality of spray layers.

Further, it also includes a plurality of spraying slurry pipes connecting the multiple spraying layers and the slurry part.

Further, the diameter of the spraying part is 6.5-14.5 meters.

By adopting the above-mentioned technical scheme and enlarging the cross-sectional size of the demisting part and the slurry part above and below the spraying part, the flow rate of the flue gas flowing through the demister can be adjusted, and the capacity of the limestone slurry in the desulfurization absorption tower can be increased. , to ensure sufficient circulation of limestone slurry, and to enable limestone slurry to fully contact with sulfur-containing flue gas. The cycle time of the total amount of slurry is prolonged, which can fully precipitate the gypsum in the slurry. Moreover, the structure is simple and stable, and it is especially suitable for using the existing desulfurization absorption tower to transform in the situation where the site and construction conditions are limited, so that it meets the emission standards required by the current environmental protection standards.

Description of drawings

Fig. 1 is a schematic structural view of the utility model in an embodiment.

Explanation of reference numerals: 1 - tower body; 2 - flue gas inlet; 3 - flue gas outlet; 4 - spraying part; 5 - defogging part; 6 - upper reducing part; 7 - lower reducing part.

detailed description

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific examples are given together with the attached drawings for detailed description as follows.

As shown in Figure 1, the new variable-diameter desulfurization absorption tower of the present invention includes: a tower body 1, including from top to bottom; a demisting part 5, a spraying part 4 and a slurry part; the spraying part includes five layers Spray layer, as can be seen from the figure, the spray layer in the middle of the tower body and the reaction part of the flue gas below the spray layer and the slurry sprayed from the spray layer can be regarded as the spray part, and the tower diameter is the same. 6.5-14.5 meters, preferably 12.5 meters. The demisting part 5 and the spraying part are connected through the upper reducing part 6, and the upper reducing part 6 has a diffusion reducing angle, which is 105°; the bottom slurry part and the spraying part are connected through the lower reducing part. The part 7 is connected, and the lower reducing part 7 has a shrinking and reducing angle, which is 64°. In fact, the above is only used to illustrate the utility model, and the utility model is not limited thereto. The number of spray layers can be selected from 2 to 6 layers according to the work needs, and the angle of diffusion and diameter reduction can be 100-107° Select between; the shrinkage angle can be selected between 55° and 70°.

In addition, the variable-diameter desulfurization absorption tower also includes a flue gas inlet 2, a flue gas outlet 3, and a spray slurry pipeline (not shown) connecting the slurry portion and the spray layer. The height of the upper variable diameter part 6 is 3-5 meters, and the height of the lower variable diameter part 7 is 2-4.5 meters. The upper variable diameter part 6 is located 0.9-1.65 meters above the spray part, preferably 1 meter. The lower diameter reducing part 7 is located 8-16 meters below the flue gas inlet 2, preferably 14 meters.

The flue gas enters the tower body from the flue gas inlet 2, first comes to the spraying part 4 to react with the spraying slurry, then passes through the upper variable diameter part 6, reduces the flow rate, and enters the demisting part 5 to fully remove the slurry particles carried by the flue gas , to avoid the phenomenon of "gypsum rain". At the same time, the gentle transition of the lower variable diameter part 7 increases the volume of the slurry part, ensures sufficient limestone slurry circulation, and enables the limestone slurry to fully contact with sulfur-containing flue gas.

The utility model has a simple and stable structure, and is especially suitable for using the existing desulfurization absorption tower to transform in the situation where the site and construction conditions are limited, so as to make it meet the discharge standard required by the current environmental protection standard. It has high promotion and application value.

Claims (8)

1. A new variable-diameter desulfurization absorption tower, characterized in that it comprises: A tower body, including from top to bottom; a defogging part, a spraying part, and a slurry part; The demisting part and the spraying part are connected through an upper reducing part, and the upper reducing part has a diffusion reducing angle, which is 100-107°; The slurry part and the spray part are connected by a lower diameter reducing part, and the lower diameter reducing part has a contraction and diameter reduction angle of 55° to 70°. 2. The new variable-diameter desulfurization absorption tower according to claim 1, characterized in that, the diffusion diameter-reduction angle is 105°, and the shrinkage diameter-reduction angle is 64°. 3. The new variable diameter desulfurization absorption tower according to claim 1, characterized in that the height of the upper variable diameter part is 3-5 meters, and the height of the lower variable diameter part is 2-4.5 meters. 4. The new variable-diameter desulfurization absorption tower according to claim 1, wherein the upper variable-diameter part is located 0.9-1.65 meters above the spray part. 5. The new variable-diameter desulfurization absorption tower according to claim 1, further comprising a flue gas inlet, and the lower diameter-changing part is located 8-16 meters below the flue gas inlet. 6. The new variable-diameter desulfurization absorption tower according to claim 1, characterized in that, the spray part comprises a plurality of spray layers. 7. The novel variable-diameter desulfurization absorption tower according to claim 6, further comprising a plurality of spray slurry pipes connecting the plurality of spray layers and the slurry portion. 8. The new variable-diameter desulfurization absorption tower according to claim 1, wherein the diameter of the spraying part is 6.5-14.5 meters.