Key Features of Glass Fiber Desulfurization Tower:
1. The fiberglass desulfurization tower is a new type of fiber-reinforced plastic composite material, manufactured by wrapping synthetic resin and glass fiber. Due to its resistance to chemical corrosion and lower cost compared to nickel alloys, our company has achieved excellent results by using fiberglass in many wet flue gas desulfurization systems. The entire process from flue gas intake to emission has successfully applied FRP materials.
2. The glass fiber reinforced plastic (FRP) sulfur towers and internal components offer excellent physical and mechanical properties, with a density of 1.8-2.1 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, Barcol 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 /℃。
3. The FRP piping and accessories in the internal spray system of the absorption tower have at least a 2.5mm thick wear-resistant liner. Standard glass pipes, when lined with a rich resin, can withstand the wear from slurry containing solid particles of 150μm or less 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 the internal surface should have a minimum bend radius of 25mm.
4. The FRP column has physical properties such as resistance to chemical corrosion and alternating dry-wet conditions, hence its service life can reach 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 FGD (Flue Gas Desulfurization) and dust removal equipment utilizes a wet FGD technology developed based on a multiphase turbulent mass transfer mechanism. It combines centrifugal water film dust removal with spray沸腾 dust removal, accelerating flue gas containing dust and harmful gases through specially designed swirl plates. The atomized liquid and desulfurization neutralizing liquid sprayed from the top of the tower collide to form a swirling force, where the gas and liquid are rapidly spun and thoroughly mixed before rising 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 generated by the atomized liquid particles, resulting in a high efficiency of capturing and absorbing dust and harmful gases per unit volume of liquid. After meeting the standard purification, the flue gas is discharged into the atmosphere through a dewatering unit, induced draft fan, and chimney. Technical specifications: Desulfurization efficiency (%) ≥98, Dust removal efficiency (%) ≥98, Lingman 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 soda ash-calcium oxide, slag water-magnesium oxide, slag water-lime, or other alkaline wastewater; Simple system operation, stable performance, and convenient maintenance; Corrosion-resistant, adaptable to large, medium, and small vertical and horizontal chain grate boilers, kilns, brick factory tunnel kiln flue gas desulfurization and dust removal, brick factory coal slag flue gas dust removal and desulfurization, also suitable for high dust concentration furnaces such as silicon iron furnaces, silicon calcium furnaces, sawdust fuel boilers, straw fuel boilers, wood fuel boilers, heavy oil fuel boilers, and waste plastic fuel boilers, etc., which are difficult to treat. Application scope: Wet FGD and dust removal equipment is suitable for coal-fired boilers in various industries.
Glass fiber desulfurization and dust removal equipment operates by controlling sulfur dioxide emissions. The dust remover 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 (here taking 28% as an example) 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 flowmeter. 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 a certain economic benefit.
Desulfurization and dust removal equipment features:
1. Wash-type working principle, high dust and desulfurization efficiency, captures more harmful gases. The flue gas purifier integrates desulfurization and dust removal, using a spray method with uniquely designed nozzles. These nozzles are made of fiberglass spiral nozzles, crafted with U.S. technology, which, under certain water pressure, spray out a dense mist. The dust, harmful gases, and the mist are fully in contact, resulting in significantly improved dust removal, desulfurization, denitrification, and carbon black washing compared to other wet dust collectors. Dust removal rate ≥ 98%, sulfur dioxide removal rate ≥ 98%, and flue gas Lingenmann blackness < level 1.
2. The dehydrating plate design is rational and unique, offering excellent dehydration performance. The drum is equipped with a dehydration unit, where the dehydrating plate is designed with rationality and uniqueness. As the mist passes through the dehydration unit, it is collided and deflected, flowing down along the drum wall, preventing secondary water carryover, and achieving high dehydration efficiency.
3. Low resistance, water and energy-saving, low operation cost. 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, the power consumption is also reduced. Furthermore, the discharged water is sedimented and reused in a closed loop, saving water resources on one hand and preventing wastewater from entering the sewers, thus avoiding secondary pollution. This achieves water and energy-saving effects, reducing operation costs.
4. Compact in size, lightweight, and minimal space occupation; easy for installation and transportation. The product is cylindrical in shape, with an integrated structure. It comes with a stand upon delivery, making installation and relocation a breeze. It can be installed in various ways, such as left-right hanging, overhead laying, etc., according to the local ground conditions and size, offering strong adaptability.
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 good desulfurization results.
Desulfurization and dust removal equipment operation procedure
Check valves and circulation pumps before equipment operation.
2. Start the recirculating pump until water flows into the settling pond from the overflow tank before initiating the fan.
3. Adjust the water supply to the equipment promptly based on the boiler's operating conditions.
4. After equipment startup, a dedicated person monitors the sedimentation basin water level and observes the pH value at all times, 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 pump series discharges a portion of the recycled water weekly and supplements industrial water.
7. Sludge is removed promptly, ensuring clear effluent water quality.
User Instructions for Desulfurization and Dust Removal Equipment
1. Dust collectors should not be supplied as ready-made products. Please refer to relevant data and information to facilitate the design of equipment and accessories that meet the users' needs and satisfaction.
1) Boiler brand, exhaust gas volume, exhaust gas temperature, coal sulfur content, and ash.
2) Boiler tail smoke channel outlet dimensions and elevation.
3) Blower model, room layout dimensions.
4) Local air emissions standards level and design requirements for dust removal and ash removal.
5) Industrial water pressure and source conditions.
6) Feedback on the operation and maintenance platform.
2. Installation Precautions:
1) The foundation for installation must be leveled to ensure the dust collector remains in a horizontal state.
2) The footer 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 dust separator should be operated for at least 24 hours.
5) Prior to operation, start the fan and inspect the tightness of the casing 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 absorption tower. The circulating洗涤 slurry is pumped into the tower through a circulating pump and used to wash the flue gas from the boiler. The SO2 in the boiler 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 has a high reactivity index. MgO is more reactive than CaO, and Mg(OH)2 is more alkaline than Ca(OH)2. During desulfurization, MgO particles react with SO2 to form MgSO3 and MgSO4, which dissolve in water without affecting further reactions.
2. Magnesium-based desulfurization offers a cost-effective alternative to calcium-based desulfurization. This is due to the fact that MgO weighs 71% of CaO and 40% of CaCO3, requiring less MgO to remove the same amount of SO2. The transportation, storage, and maturation systems, as well as the desulfurizing agent supply system, are also simplified compared to calcium-based methods.
3. The desulfurization by-products have high solubility. The desulfurization by-products, such as MgSO3 and MgSO4, are highly soluble, with their solid suspended particles being loose fine powder, which is not prone to settling. Moreover, the desulfurization process occurs in a liquid state, eliminating issues like scaling, caking, wear, and blockage.
4. No secondary pollution. The byproduct slurry from magnesium-based desulfurization is primarily a water solution of MgSO4 after aeration treatment, which can be directly discharged into the sewage pipeline or channeled through the power plant's original fly ash pipeline to the ash pond without causing secondary pollution.
1. 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 operation, any issues related to the equipment's quality will be addressed by our company at no cost, with a response within 12 hours. In emergencies, technical personnel 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 skills necessary for proper operation and maintenance of the equipment.
The dual alkali method for flue gas desulfurization overcomes the drawback of scaling in the limestone-lime process. Traditional limestone/lime-gypsum flue gas desulfurization processes use calcium-based desulfurizing agents to absorb sulfur dioxide, forming calcium sulfate and calcium sulfite, which have low solubility and tend to cause scaling and blockages within the desulfurization tower and pipelines. Scaling and blockage issues severely impact the normal operation of the desulfurization system and, worse, can significantly affect the boiler system's operation. To minimize the disadvantages of calcium-based desulfurizing agents, most calcium-based desulfurization processes require corresponding forced oxidation systems (aeration systems), 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 products are difficult to handle, creating a contradiction. The dual alkali flue gas desulfurization process emerged as a solution to these contradictions, effectively addressing the aforementioned issues.
Compared to the limestone or lime wet flue gas desulfurization process, the double alkali method offers the following advantages: 1. Using NaOH for desulfurization, the circulating water is essentially a solution of NaOH, which minimizes corrosion and blockages in pumps, pipes, and equipment during the circulation process, facilitating equipment operation and maintenance.
2. Regeneration of absorbents and sedimentation of desulfurization sludge occur outside the tower, thereby avoiding internal blockage and wear, enhancing operational reliability, and reducing operating costs; at the same time, high-efficiency tray or packed towers can replace the empty tower, making the system more compact and improving desulfurization efficiency.
3. Sodium-based absorbent solutions have a rapid absorption rate for SO2, allowing for a smaller liquid-gas ratio to achieve a higher desulfurization efficiency, usually over 90%.
4. For the desulfurization and dust removal integrated technology, it can improve the utilization rate of lime.
The drawback is that the byproduct Na2SO4 from the oxidation reaction of NaSO3 is difficult to regenerate, necessitating continuous replenishment of NaOH or Na2CO3, thereby increasing the consumption of alkali. Additionally, the presence of Na2SO4 will also reduce the quality of plaster.
The dual 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.
Ammonia-Sulfur Ammonium Method Desulfurization Process Features
The wet ammonia desulfurization process is a mature and industrialized desulfurization technique. It uses ammonia absorbent to wash flue gas containing sulfur dioxide, with the byproduct ammonium sulfate suitable for agricultural fertilizers. It can well meet the needs of China's flue gas desulfurization development. The wet ammonia desulfurization process has the following advantages:
1. Wide application range, not restricted by sulfur content or boiler capacity. 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 very low sulfur dioxide concentration but also sees a significant reduction in dust content.
3. Absorbents are easily procurable and come in three forms: liquid ammonia, ammonia water, and ammonium carbonate.
4. The ammonia desulfurization unit has strong adaptability to changes in unit load, capable of accommodating rapid start-up, cold start-up, warm start-up, and hot start-up methods; operates efficiently under unit load conditions 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. Byproduct ammonium sulfate is highly valuable with good economic benefits; glass fiber denitrification, dust removal, and desulfurization integrated system
Integrated denitrification, dust removal, and desulfurization design process: Flue gas →增压风机→ waste heat recovery unit ( economizer) → heat exchanger → integrated denitrification, desulfurization, and dust removal tower → heat exchanger → high-altitude emissions.
Selection Guide for Denitrification, Dust Removal, and Desulfurization Systems
The system must be designed based on the user-provided boiler model, coal consumption, flue gas composition, flow rate, temperature, medium concentration, and other specifications, as well as user requirements. We can undertake the entire project or part of it. Our company has specialized calculation program software, ensuring accurate and reasonable component selection.
Application Field
This system is widely applied in the power, steel, fertilizer, cement industries, and environmental improvement for other industrial enterprises' flue gas pollution treatment. Its business scope covers flue gas denitrification and desulfurization, dust removal, sulfur dioxide waste gas recycling, deep energy-saving retrofitting of boilers, and wastewater treatment.
