Sulfur dioxide reflux device in desulfurization plant

Abstract

The utility model relates to the technical field of lead-zinc pyrometallurgy, and discloses a sulfur dioxide reflux device in a desulfurization plant, which comprises a discharge pipeline connected with an emergency pool in the desulfurization plant, the discharge pipeline is communicated with a washing tower, the discharge pipeline is connected with a booster fan, and the booster fan is used for forming negative pressure in the discharge pipeline. The glass fiber reinforced plastic pipeline is additionally arranged on an existing emergency pool, negative pressure is formed in the glass fiber reinforced plastic pipeline through the booster fan, and sulfur dioxide gas dissipation in the emergency pool is reduced by means of a process negative pressure pipeline of a desulfurization system, so that the concentration of sulfur dioxide in a desulfurization plant is effectively reduced, and the frequency of manual watering is reduced; and the environment quality in a plant is improved.

Description

Technical Field

[0001] This utility model relates to the field of lead-zinc pyrometallurgical technology, and in particular to a sulfur dioxide reflux device in a desulfurization plant. Background Technology

[0002] The desulfurization system in the sintering workshop uses an absorbent to absorb SO2. 2 The first step in desulfurization is flue gas pretreatment. The flue gas, after being blown into a scrubbing tower by a booster fan, undergoes efficient purification through a combination of spraying devices and a packing layer. The flue gas contains SO₂. 3 Due to the high HCl content, the scrubbing tower is designed in two stages, with the scrubbing water circulating in stages. The scrubbing water from the upper stage is sprayed and counter-currently contacted with the flue gas, continuously discharged into the lower stage to replenish the water evaporated there. Industrial water is continuously added to the upper stage. The lower stage removes SO₂ from the flue gas. 3 After extensive washing, the washing water has a low pH and a high concentration of dilute sulfuric acid, resulting in less absorption of HCl from the flue gas; the upper section removes the remaining SO₂ from the flue gas. 3 After washing, the wash water has a high pH and absorbs a large amount of HCl from the flue gas, which is beneficial for removing a large amount of HCl from the flue gas. The wash water is recycled and pumped to the middle of the tower to continue spraying down to wash the flue gas. However, in order to control the concentration of impurities in the wash water, a small amount of wash wastewater needs to be discharged to the emergency pool. Then, the excess wash wastewater is sent to the sewage treatment system in a metered and continuous manner by the wastewater pump. However, the discharge of a small amount of wash wastewater results in the carryover of a small amount of SO2. 2 This caused the air quality in the factory building on the first floor to deteriorate. Utility Model Content

[0003] The purpose of this invention is to provide a sulfur dioxide reflux device in a desulfurization plant to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A sulfur dioxide reflux device in a desulfurization plant includes an exhaust pipe connected to an emergency pool in the desulfurization plant, the exhaust pipe being connected to a scrubbing tower, and a booster fan connected to the exhaust pipe, the booster fan being used to create negative pressure in the exhaust pipe.

[0006] The discharge pipe is a corrosion-resistant fiberglass pipe.

[0007] A valve is installed on the discharge pipe between the emergency pool and the booster fan.

[0008] A valve is installed on the discharge pipe between the booster fan and the scrubbing tower.

[0009] The valve is a fluoropolymer-lined gate valve.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0011] This invention adds fiberglass pipes to the existing emergency pool and creates negative pressure inside the fiberglass pipes using a booster fan. By utilizing the negative pressure pipeline of the desulfurization system, the escape of sulfur dioxide gas from the emergency pool is reduced, effectively lowering the sulfur dioxide concentration in the desulfurization plant, reducing the frequency of manual watering, and improving the environmental quality inside the plant. Attached Figure Description

[0012] Figure 1 This is a structural principle block diagram of this utility model. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] like Figure 1 As shown, this utility model provides a sulfur dioxide recirculation device in a desulfurization plant, comprising the following: A discharge pipe is installed on the emergency pool in the desulfurization plant. The discharge pipe is a corrosion-resistant fiberglass pipe, approximately 3 meters long. An air inlet of a booster fan is introduced into the fiberglass pipe. The booster fan creates positive and negative pressure within the discharge pipe and the external emergency pool, diverting the sulfur dioxide carried out by the wastewater from the emergency pool to the flue gas duct of the new machine tail and then back into the scrubbing tower for desulfurization. Considering shutdown situations, fluoropolymer-lined gate valves (model Z41F46-10CDN150) are installed at both ends of the booster fan in the fiberglass pipe. The gate valves are closed when the plant is shut down and opened during normal operation to remove the overflowing sulfur dioxide from the emergency pool. They are closed when the plant is shut down to ensure the environmental quality of the plant area.

Claims

1. A sulfur dioxide reflux device in a desulfurization plant, characterized in that: It includes an exhaust pipe connected to the emergency pool inside the desulfurization plant, the exhaust pipe being connected to the scrubbing tower, and a booster fan connected to the exhaust pipe, the booster fan being used to create negative pressure inside the exhaust pipe; The discharge pipe is a corrosion-resistant fiberglass pipe.

2. The sulfur dioxide reflux device in a desulfurization plant according to claim 1, characterized in that: A valve is installed on the discharge pipe between the emergency pool and the booster fan.

3. The sulfur dioxide reflux device in a desulfurization plant according to claim 2, characterized in that: A valve is installed on the discharge pipe between the booster fan and the scrubbing tower.

4. The sulfur dioxide reflux device in a desulfurization plant according to claim 3, characterized in that: The valve is a fluoropolymer-lined gate valve.

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