Active, high specific surface area calcium hydroxide desulfurization (powder) technology carries out desulfurization absorption and product treatment in a dry state. This method boasts advantages such as no wastewater or waste acid discharge, reduced equipment corrosion, no significant temperature drop during purification, high flue gas temperature after purification, favorable for chimney exhaust diffusion, and minimal secondary pollution. It is suitable for flue gas desulfurization technology in industries such as steel, coking, cement, glass, and ceramics.
Section 1: Flue Gas Desulfurization Technology Introduction
In recent years, the dry desulfurization technology for flue gas has seen increasing application in small and medium-sized flue gas desulfurization systems. The technology is mature and operates stably, with sodium bicarbonate as the alkali source.The SDS desulfurization process route, with its high desulfurization efficiency, broad source of desulfurization agents, and low difficulty in engineering implementation, has rapidly expanded its market share.
As the number of equipment increases, the drawbacks of this technological route start to become apparent, and how to handle desulfurization ash has become a new environmental challenge. Sodium-based desulfurization ash is a mixture of sodium sulfate, sodium sulfite, and sodium carbonate..Materials, with excellent water solubility, fall under the category of general solid waste that is difficult to dispose of in compliance with regulations. Authoritative statistics indicate that the coking industry alone produces a massive amount of sodium-based desulfurization ash each year, totaling...300,000 tons, plus the power station boilers, hot blast stoves, and heating furnaces of steel enterprises, as well as glass furnace, cement kiln, etc., the sodium-based desulfurization ash increases exponentially. Some companies rent land to build warehouses for storage, while others sell it to qualified institutions for disposal, with costs ranging from 300 to 500 yuan per ton, adding to the burden on businesses.
The revised "Environmental Protection Law of the People's Republic of China on Solid Waste Pollution" took effect on September 1, 2020, introducing new responsibilities for enterprises generating solid waste and imposing severe penalties on illegal activities. The pressure on businesses has surged!
Tianjin Huaneng Langtian Environmental Protection Equipment Co., Ltd., after four years of research and development efforts by our technical staff, has successfully developed calcium hydroxide with a high specific surface area. Specific surface area (Achieved BET over 45m2/g, through independently developed core equipment, created a new production process, and achieved large-scale production. Tianjin production base with a 100,000 tons annual capacity, offering excellent product performance!
Utilizing the HNPS desulfurization system developed by our company, more than 30 sets have been industrially applied with excellent operational data, low costs, and satisfied customers. Currently, the system has successfully been applied for ultra-low emissions desulfurization in coke oven pusher ground stations, dry-cooling coke dust removal, coke oven flue gas, steelmaking heating furnaces, hot blast stoves, power plant boilers, and waste incineration industrial furnaces.
Highly active, high surface area calcium hydroxideMicrocrystalline structure under an electron microscope
Section 3: High-activity, high-specific-surface-area calcium hydroxide desulfurizer specifications
Four. High-activity, high-specific surface calcium hydroxide, recommended usage conditions
V. High-activity, high-specific-surface-area calcium hydroxide characteristics
Highly active and high surface area calcium hydroxide features porous structure, high activity, good dispersibility, and high utilization rate. Its specific surface area is 3-4 times that of common calcium hydroxide, and is widely recognized internationally as an excellent dry desulfurization product. Dry desulfurization agents used in practice mainly include high surface area calcium hydroxide and baking soda. While baking soda has a fast reaction rate, it is relatively expensive and difficult to dispose of solid waste. In the 1980s, high surface area calcium hydroxide was extensively used in waste-to-energy power plants and thermal power plants in Europe, America, and Japan, successfully replacing baking soda. With well-developed pores, high surface area calcium hydroxide can quickly adsorb and absorb HCl and SO2 from flue gas, achieving a utilization rate of over 85%.
Six.Introduction to HNPS Dry Desulfurization Process
Highly active and high surface area calcium hydroxide dry powder desulfurizer, directly喷射 into the flue gas duct through air conveying, where the calcium hydroxide powder rapidly disperses in the flue gas under the action of an efficient jet. It adsorbs and absorbs most of the acidic media such as F-, Cl-, SO2, and SO3 in the flue gas, and then enters the bag dust collector with the flue gas. A small portion of the acidic media continues to react in the bag dust collector. The flue gas after desulfurization is then directly discharged through an induced draft fan.
This process is unaffected by the temperature of the smoke, and it can effectively react above room temperature.
Section 7: Characteristics of High-activity, High-Surface-Area Calcium Hydroxide Desulfurization System
1. Storage System: Equipped with large-capacity powder storage silos, radar and anti-rotation level sensors, safety valves, vibration motors, arch-breaking assist flow air discs, and other accessories.
2. Feeding System: Utilizes a high-precision rotating feeder, measured through frequency conversion by sensors.
3. Power System: Positive pressure conveying with Roots blower or compressed air, one in use and one in reserve.
4. Control System: Centralized control in the control room, with computer screens displaying levels, feeders' operating frequencies, and other key operational states or parameters. The system is equipped with high and low level alarms, level display, and status and fault alarms for the Roots blower.
Section 8: Characteristics of High-activity, High-Surface Area Calcium Hydroxide Dry Desulfurization
1. Meets ultra-low emission requirements with high desulfurization efficiency; export SO2 concentration can reach near-zero emission standards. Flue gas sulfur dioxide concentration is between 40-300 mg/Nm3, particularly cost-effective.
2. Wide temperature window, utilizing flue gas treatment at 30-350°C, with high desulfurization efficiency.
3. The process is simple, with the ultra-fine powder directly sprayed into the flue by an efficient jet, completing the absorption reaction during the flow of flue gas.
4. Ensure the dust collector is either retrofitted or newly installed to meet the ultra-low dust emission requirements of the system.
5. By-products are general solid waste, consisting of saturated waste desulfurizing agent, mainly containing CaSO4, Ca(OH)2, and CaCO3.
6. Centralized control room operation without increasing personnel, with minimal equipment footprint, particularly suitable for low-temperature, low-sulfur environments.
7. Alternative to baking soda process: cost-effective investment, low energy consumption, and waste disposal solution.
Section 9: Typical Performance in Various Industries
Coking Industry - Coke Pushing Ground StationShougang Qian'an Sinochem Coal Chemical Co., Ltd.'s No.1, No.2, and No.3 coke ovens - Push coke surface dedusting with high-activity, high-surface-area calcium hydroxide desulfurization, the industrial unit was put into operation on June 8, 2021, with stable data below 10mg/m3.
2. Coking Industry - Dry Quenching Gas and Coke Oven Flue Gas - High-activity, High-Surface Area Calcium Hydroxide Desulfurization
3. Steel Industry - Hot Blast Furnaces, Heating Furnaces - High-activity, High-surface-area Calcium Hydroxide Desulfurization
4. Other Industries - Waste-to-Energy Power Plants & Power Station Boilers - High-Activity, High-Surface Area Calcium Hydroxide Desulfurization
