Desulfurization spray tower (dual alkali method)

HLP-II Type I Desulfurization Spray Tower

HLP type desulfurization spray tower is the main equipment for SO2 absorption and purification. There are two types of spray tower: large size tower and small and medium-sized tower .It can continuously and efficiently purify flue gas in an instant. Because of the advantages of simple structure and mature technology, spray tower is widely used in large power plants, small and medium-sized industrial boiler flue gas treatment.

Refinement treatment of the internal anti-corrosion layer of the tower body:

1. Grinding, sandblasting and derusting of carbon steel tower after completion;

2. The tower is fully covered with 5mm thick FRP anti-corrosive layer;

3. Special high-strength resin cement coating;

4. 30mm natural granite lining is adopted, temperature resistance is 200°C, service life is designed for 30 years.

Characteristics

1. More contact area and contact time between the connection of gas and liquid;

2. Strong disturbance and high SO2 absorption efficiency; Stable operation with appropriate operation flexibility;

3. The pressure drop is small when the air flow passes through;

4. Simple structure, easy maintenance and long service life;

5. No scaling, no blocking, wear resistance, corrosion resistance, high temperature resistance.

The double alkali method uses sodium base desulfurizer for desulfurization in the tower. Due to the strong alkalinity of SO2, the reaction product has a high solubility, which will not cause supersaturated crystallization and scaling.

Double alkali flue gas desulfurization technology is to use sodium hydroxide solution as the starting desulfurizer, the prepared sodium hydroxide solution directly into the desulfurization tower washing to remove SO2 in the flue gas to achieve the purpose of flue gas desulfurization. Desulfurization waste liquid is discharged into the regeneration tank for reduction and regeneration with calcium hydroxide. The regenerated sodium-based desulfurizer is then returned to the desulfurization tower for recycling. Under the condition of calcium hydroxide regeneration reaction, the desulfurization by-product calcium sulfate or calcium sulfite is discharged from the water body.

The double alkali desulphurization process reduces the investment and operation cost and is more suitable for desulphurization of small and medium-sized boilers.

The demister inside the desulfurization tower adopts a design combining two layers of baffle plates and three layers of flushing, which significantly enhances the demisting effect, effectively reduces the moisture content of the flue gas entering the wet electrostatic precipitator, and further improves the charging efficiency and dust collection effect.

Manufacturing & Production Capacity

After-Sales Service

Haina provides on-site installation, commissioning and technical training.Regular follow-up inspections are arranged after project delivery to support long-term operation stability.

FAQ

1、What are the reasons why the desulfurization efficiency is unstable and cannot guarantee long - term stable compliance, and how to solve them?
The main reason is that the design of the spray layer is unreasonable and the liquid - gas ratio is insufficient, resulting in fluctuations in the desulfurization efficiency.

Our company uses a three - stage or four - stage spray system: multi - layer bidirectional centrifugal nozzles are arranged to ensure full contact between the flue gas and the slurry in the tower, complete reaction, and stable desulfurization efficiency ≥ 98.5%. It can easily achieve SO ≤ ₂35mg/m³ or even lower. At the same time, the liquid - gas ratio is precisely designed: it is accurately calculated according to the inlet SO₂ concentration, which not only ensures the efficiency but also avoids excessive consumption.

2、What are the reasons and solutions for the corrosion and perforation of the tower body, nozzles, and pipelines, resulting in a short service life?

The reasons are as follows: ① The carbon - steel tower body corrodes and leaks in a short period due to the acidic slurry and the humid chloride - ion environment. ② The nozzles wear out quickly, require frequent replacement, and lead to high maintenance costs.
    Our company's anti - corrosion technology: We adopt the integral winding process of steel - lined fiberglass/granite to fundamentally solve the corrosion problem. We promise that the service life of the main can equipment reach 30 years, far exceeding that of the traditional carbon - steel rubber lining (3 - 5 years).② Wear - resistant and corrosion - resistantleszz no: We select nozzles made of silicon carbide or polymer materials, which have strong resistance to wear and corrosion and a long service life.

What are the reasons for the high operating cost of the desulfurization tower?

The reasons are as follows: ① The multi - layer spray and circulating pumps lead large system to resistance, and electricity cost is the main expense. ② The consumption of lime/alkali is large, the utilization rate of the absorbent is low, and the material cost is high.

Our company uses a high - efficiency demister to reduce pressure loss: A high - efficiency roof - type demister is installed at the top of the tower to reduce the total system resistance, thereby reducing the power consumption of the induced draft fan. Improve the utilization rate of the absorbent: Measures such as optimizing pH value control and increasing reaction time are taken to improve the utilization rate of lime/alkali and reduce ineffective consumption.