Key Features of Glass Fiber Desulfurization Tower:

1. Glass fiber reinforced plastic desulfurization towers are a new type of fiber composite material, manufactured using winding technology with synthetic resin and glass fibers. Due to their resistance to chemical corrosion and lower cost compared to nickel alloys, our company has achieved excellent results in applying glass fiber reinforced plastic in many wet desulfurization systems. The entire process from flue gas inlet to exhaust has successfully utilized FRP materials.

2. The FRP (Fiberglass Reinforced Plastic) sulfur towers and internal components offer excellent physical and mechanical properties, with a density ranging from 1.8 to 2.1 g/cm³, tensile strength of 160-320 MPa, axial bending strength of 140 MPa, interlaminar shear strength of 50 MPa, tensile modulus of 25 GPa, shear modulus of 7 GPa, bending modulus of 9.3 GPa, bus hardness of 40, Poisson's ratio of 0.3, elongation at break of 0.8-1.2%, and thermal expansion coefficient of 11.2*10^-6 /℃。 Internal surface roughness is 0.0084.

3. The FRP piping and accessories in the spray system of the absorption tower have at least a 2.5mm thick wear-resistant liner. Standard glass piping, when lined with a rich resin, can withstand the abrasion of slurry containing solid particles less than 150μm and a flow rate below 2m/s. The wear resistance of FRP can be enhanced by adding wear-resistant fillers (such as SiO2, SiC, ceramic powder). The bend radius of FRP should be at least three times the diameter or have an internal bending radius of at least 25mm.

4. The FRP pith tower boasts chemical corrosion resistance and alternating wet and dry physical properties, thus ensuring a service life of up to 20 years.

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Equipment Resistance: ＜1100 Pa

Inlet Temperature: 280°C

Desulfurization efficiency up to 96% and above

Service Life ≥ 15 Years

Desulfurization tower process principle:

Brick factory-specific wet flue gas desulfurization and dust removal unit, utilizing a wet desulfurization and dust removal technology developed based on a multiphase turbulent mass transfer mechanism. This technology combines centrifugal water film dust removal with spray沸腾 desulfurization and dust removal into one unit. The flue gas containing dust and harmful gases is accelerated through a specially designed swirl plate separator, then the atomized liquid and desulfurization neutralizing liquid sprayed at the top of the tower collide to form a swirling force. The gas and liquid are rapidly spun, fully mixed, and rise into the boiling reaction layer. The dust and harmful gases in the flue gas are captured and absorbed by the fine liquid particles in the desulfurization liquid, due to the large number of interfaces produced by the atomized liquid particles, the unit liquid volume has a high efficiency for capturing and absorbing dust and harmful gases. The purified flue gas after meeting the standard is discharged into the atmosphere through a dehydration unit, induced draft fan, and chimney. Technical specifications: Desulfurization efficiency (%) ≥98, Dust removal efficiency (%) ≥98, Ringelmann blackness (grade) ≤1, Liquid-gas ratio (L/m³) 0.8～1.5, System resistance (Pa) <800. Technical features: Integrated desulfurization and dust removal, compact structure, small equipment footprint, low investment cost; desulfurizing agents can be pure soda lime - calcium oxide, slag water - magnesium oxide, slag water - lime, or other alkaline wastewater; simple system operation, stable operation, easy maintenance; corrosion-resistant, adaptable to the strengths, suitable for various vertical and horizontal chain grate boilers, kilns, brick factory tunnel kiln flue gas desulfurization and dust removal, brick factory coal gangue flue gas dust removal and desulfurization, also suitable for high dust concentration smelting furnaces such as silicon iron furnaces, silicon calcium furnaces, sawdust fuel boilers, straw fuel boilers, wood fuel boilers, heavy oil fuel boilers, waste plastic fuel boilers, and other difficult-to-treat flue gases. Application range: Wet flue gas desulfurization and dust removal units are suitable for coal-fired boilers in various industries.

Glass fiber desulfurization and dust removal equipment operates by controlling sulfur dioxide emissions. The dust collector not only removes sulfur dioxide from flue gas but also produces high-value ammonium sulfate fertilizer products. This boiler dust removal equipment uses a certain concentration of ammonia water (for example, 28%) as a desulfurizing agent, producing an ammonium sulfate slurry that is transported to the fertilizer plant's treatment system. The amount of ammonia water required for the desulfurization process is automatically regulated by a preset pH control valve and measured by a flow meter. The ammonium sulfate crystals are crystallized from the saturated ammonium sulfate slurry in the desulfurization and dust removal equipment, forming suspended particles with a weight ratio of about 35%. These slurries are then pumped to the treatment site, where they undergo primary and secondary dewatering. Subsequently, they are sent to the fertilizer plant for further dewatering, drying, condensation, and storage. While the boiler dust removal equipment desulfurizes the flue gas, it also generates considerable by-products, achieving economic benefits.

Desulfurization and dust removal unit features:

1. Washing principle with high dust and desulfurization efficiency, capturing a large amount of harmful gases. The flue gas purifier integrates desulfurization and dust removal, utilizing a spray method with uniquely designed nozzles. These nozzles are made of glass fiber reinforced plastic using American technology, which, under certain water pressure, emit a dense mist. The dust, harmful gases, and the mist are in thorough contact, resulting in significantly improved dust, desulfurization, denitrification, and carbon black washing effects compared to other wet dust collectors. Dust removal rate ≥ 98%, sulfur dioxide removal rate ≥ 98%, flue gas Ringelmann blackness < level 1.

2. The dehydrating plate design is rational and unique, with excellent dehydration performance. The drum is equipped with a dehydration unit. The dehydrating plate is designed to be rational and unique, causing mist to collide and redirect upon passing through the dehydration unit, flowing down along the drum wall, preventing secondary water carryover, and achieving high dehydration efficiency.

3. Low resistance, water and energy-saving, with low operational costs. Flue gas is naturally introduced from the bottom of the cylinder, with a large cross-section and low wind speed, resulting in low resistance. The main resistance is ≤600Pa, and the system resistance is ≤1200Pa. Due to the low resistance, less power is consumed. Additionally, the discharged water is沉淀 and reused in a closed loop, saving water resources on one hand and preventing wastewater from entering the sewage system to cause secondary pollution on the other. This achieves water and energy-saving effects, thereby reducing operational costs.

4. Compact, lightweight, and space-saving with easy installation and transportation. This product features a cylindrical shape, with an integral structure, comes with a stand upon shipment, and is highly convenient for installation and relocation. It can be mounted in various ways, such as hanging from left to right, suspended, or laid on the ground, adapting to different ground conditions and sizes.

5. Operation is relatively simple and convenient, with minimal maintenance required. It's easy to operate, manage, and maintain, boasting a high operational rate and adaptability to various working environments.

6. Strong adaptability to fluctuations in SO2 concentration in flue gas; different desulfurization processes can accommodate varying sulfur content in coal. Desulfurizing agents can be selected in various forms such as lime, alkali, and magnesium oxide, achieving excellent desulfurization results.

Flue Gas Desulfurization and Dust Removal Equipment Operation Procedure

1. Check that the valves and circulating pumps are functioning properly before operating the equipment.

2. Start the recirculating pump until water flows into the sedimentation tank, then the exhaust fan can be activated.

3. Adjust the water supply to the equipment in a timely manner based on the boiler's operating conditions.

4. After equipment startup, a dedicated person monitors the sedimentation pond water level and continuously observes the pH value, with the circulating pH ranging between 8-10.

5. While the boiler is shut down, a comprehensive inspection and maintenance of the dust collector should be conducted. Check for any blockages in the water supply lines and open the ash outlet valve to thoroughly remove accumulated dust.

6. The circulating water pump series discharges a portion of the recycled water weekly and supplements industrial water.

7. Sludge is cleared promptly, ensuring the effluent water is clear.

User Instructions for Desulfurization and Dust Removal Equipment

1. Dust collectors should generally not be supplied as finished products. Please refer to relevant data and materials to facilitate the design of equipment and accessories that meet user satisfaction.

1) Boiler brand, exhaust gas volume, exhaust gas temperature, coal sulfur content, and ash.

2) Boiler tail smoke channel outlet size and elevation.

3) Blower model, room-related dimensions.

4) Local air emission standards and design requirements for dust emission and removal.

5) Industrial water pressure and water source conditions.

6) Comments on the operation and maintenance platform.

2. Installation Precautions:

1) The installation feet need to be leveled to ensure the dust collector remains in a horizontal state.

2) The base plate is securely spot-welded to the foundation's embedded iron.

3) After the overall installation is completed, before commissioning, the intake door must be opened to check for any loose or detached internal components and abrasion-resistant layers, as well as for any debris, which should be removed immediately.

4) The deduster should be operated for at least 24 hours.

5) Prior to operation, start the fan and inspect the tightness of the shell flanges and all openings. Any air leaks should be eliminated promptly.

Magnesium Oxide Method

Magnesium oxide desulfurization involves first mixing magnesium oxide powder with hot water to form a Mg(OH)2 slurry, which is then added to the absorber tower. The circulating洗涤 slurry is pumped into the tower through a circulating pump to rinse the flue gas from the boiler. The SO2 in the flue gas reacts with MgO to form MgSO3, which is then oxidized to become MgSO4 solution.

Specific reactions are as follows:

Slurry Preparation: MgO + H2O = 2Mg(OH)2

Absorption Reaction: Mg(OH)2 + SO2 → MgSO3 + H2O

MgSO3 + SO2 + H2O→Mg(HSO3)2

Mg(HSO3)2 + Mg(OH)2→2MgSO3 + 2H2O

Oxidation reaction: MgSO3 + 1/2O2 → MgSO4

Byproduct Recovery: MgSO4 + 7 H2O = MgSO4·7H2O

Characteristics of Magnesium Oxide Method:

1. MgO is porous, highly reactive, and exhibits high reactivity. It has a higher reaction activity than CaO, and Mg(OH)2 is more alkaline than Ca(OH)2. In desulfurization reactions, MgO particles react with SO2 to form MgSO3 and MgSO4, which dissolve in water, without affecting further reactions.

2. Utilizing magnesium-based desulfurization saves on investment compared to calcium-based desulfurization. This is because the weight of MgO is 71% of CaO and 40% of CaCO3, requiring less MgO to remove the same amount of SO2. The transportation, storage system, and maturation system for desulfurizing agents are also simplified compared to calcium-based systems.

3. The by-products of desulfurization have high solubility. The by-products MgSO3 and MgSO4 are highly soluble, with their solid suspended particles being loose fine powder, which is not prone to sedimentation. Moreover, desulfurization is carried out in a liquid state, eliminating issues such as scaling, blockage, and wear.

4. No secondary pollution. The by-product slurry from magnesium-based desulfurization is primarily a water solution of MgSO4 after aeration. It can be directly discharged into the sewage pipeline or sent through the power plant's original fly ash pipeline to the ash field without causing secondary pollution.

Our company ensures the normal operation of the desulfurization equipment by providing on-site installation and debugging services by our engineers.

2. Within one year of normal equipment use, any issues related to the equipment's quality will be addressed by our company at no cost, and a response will be provided within 12 hours. In urgent situations, a technician will be sent for on-site guidance.

3. We can provide technical training for your operators based on the actual situation, enabling them to quickly master the technical skills for the correct operation and maintenance of the equipment.

The dual alkali flue gas desulfurization technology overcomes the drawback of scaling in the limestone-lime method. The traditional limestone/lime-gypsum flue gas desulfurization process, which uses calcium-based desulfurizing agents to absorb sulfur dioxide, forms calcium sulfate after the reaction. Due to its low solubility, it tends to scale up and cause blockages inside the desulfurization tower and pipelines. Scaling and blockage issues severely affect the normal operation of the desulfurization system, and can even severely impact the boiler system's operation. To minimize the disadvantages of calcium-based desulfurizing agents, most calcium desulfurization processes require a corresponding forced oxidation system (aeration system), thereby increasing initial investment and operating costs. The use of inexpensive desulfurizing agents can easily lead to scaling and blockages, while solely using sodium-based desulfurizing agents is too costly and the desulfurization by-products are difficult to handle. These conflicting issues led to the emergence of the dual alkali flue gas desulfurization process, which effectively resolves these contradictions.

Compared to the limestone or lime wet flue gas desulfurization process, the double alkali method offers the following advantages: 1. Uses NaOH for desulfurization; the circulating water is essentially a solution of NaOH, which causes no corrosion or clogging to pumps, pipes, or equipment during the circulation process, facilitating equipment operation and maintenance.

2. The regeneration of absorbents and the sedimentation of desulfurization sludge occur outside the tower, thereby avoiding internal clogging and wear, enhancing operational reliability, and reducing operational costs. Additionally, an efficient plate tower or packed tower can replace the empty tower, making the system more compact and improving desulfurization efficiency.

3. Sodium-based absorbent liquids absorb SO2 rapidly, allowing for a smaller liquid-gas ratio while achieving a high desulfurization efficiency, typically over 90%.

4. For desulfurization and dust removal integrated technology, it can improve the utilization rate of lime.

Disadvantages include: The byproduct Na2SO4 from the oxidation of NaSO3 is difficult to regenerate, necessitating the continuous addition of NaOH or Na2CO3 to increase the consumption of alkali. Additionally, the presence of Na2SO4 will also reduce the quality of gypsum.

Double alkali desulfurization technology is a mature technique used both domestically and internationally. It is particularly suitable for desulfurization of flue gas in small and medium-sized boilers and has a broad market prospect.

Ammonium Sulfate Desulfurization Process Features

The wet ammonia desulfurization process is a mature and industrialized desulfurization technology, utilizing ammonia absorbent to wash flue gas containing sulfur dioxide. The byproduct, ammonium sulfate, can be used as an agricultural fertilizer. It is well-suited to meet the needs of China's flue gas desulfurization development. The wet ammonia desulfurization process offers the following advantages:

1. Wide application range,不受sulfur content or boiler capacity limitations. The higher the sulfur content, the greater the output of ammonium sulfate.

2. The desulfurization efficiency is very high, easily exceeding 95%. The flue gas after desulfurization not only has a low sulfur dioxide concentration but also a significantly reduced dust content.

3. Absorbents are readily available in three forms: liquid ammonia, ammonia water, and carbon ammonium.

4. The ammonia desulfurization unit has strong adaptability to changes in unit load, capable of accommodating rapid startups, cold startups, warm startups, and hot startups; it can operate under unit loads ranging from 35% to 140% of the Basic Maximum Continuous Rating (BMCR).

5. There are successful operating cases both domestically and internationally, with excellent reliability and no scaling issues encountered.

6. Ammonia is an excellent alkaline absorbent with a high utilization rate of absorbents.

7. By-product ammonium sulfate has high value and good economic benefits; glass fiber integrated denitrification, dust removal, and desulfurization.

Integrated denitrification, dust removal, and desulfurization design process: Flue gas → Boosting fan → Waste heat recovery unit (economizer) → Heat exchanger → Denitrification, desulfurization, and dust removal integrated tower → Heat exchanger → High-altitude emission.

Selection Guide for Denitrification, Dust Removal, and Desulfurization Systems

The system must be designed based on the boiler model, coal consumption, flue gas composition, flue gas flow rate, temperature, medium concentration, and other indicators provided by the user, and can undertake the entire project or a part of it. Our company has specialized calculation program software, ensuring accurate and reasonable selection.

Application Field

This system is widely used in the power, steel, fertilizer, cement industries, and environmental improvement for other industrial enterprises, covering areas such as flue gas denitration and desulfurization, dust removal, sulfur dioxide gas recycling, deep energy-saving transformation of boilers, and wastewater treatment.