Active, high-specific-surface-area calcium hydroxide desulfurization (powder) technology performs 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 flue gas purification, higher flue gas temperature after purification, favorable for chimney exhaust diffusion, and less secondary pollution. It is suitable for flue gas desulfurization technology in industries such as steel, coking, cement, glass, and ceramics.

Section 1: 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, due to its mature technology and stable operation. Among these, the SDS desulfurization process using sodium bicarbonate as the alkali source has rapidly expanded its market share, thanks to its high desulfurization efficiency, wide availability of desulfurizing agents, and low difficulty in engineering implementation.

As the number of equipment increases, the drawbacks of this technological route begin to show, 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 are highly water-soluble and generally classified as difficult-to-comply-with solid waste. Authoritative statistics show that the coking industry alone produces up to 300,000 tons of sodium-based desulfurization ash annually. This figure is further multiplied by the power plants, hot air furnaces, and heating furnaces of steel enterprises, as well as glass and cement kilns. Some companies rent storage space to store the ash, while others sell it to qualified institutions for disposal, with costs varying from 300 to 500 yuan per ton, adding to the enterprise's burden.

As of September 1, 2020, the revised "Environmental Protection Law of the People's Republic of China on Solid Waste Pollution" came into effect, 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 breakthrough efforts by our R&D team, we have successfully developed high-surface-area calcium hydroxide with a specific surface area (BET) exceeding 45 m2/g. Through independently developed core equipment, we have created a new production process, achieving mass production. Our Tianjin production base boasts a 100,000-ton capacity, and our products offer superior performance!

Utilizing the HNPS desulfurization package developed by our company, it has been industrially applied in over 30 units with excellent operational data, low costs, and satisfied customers. Currently, it has successfully been applied in the coking plant pusher ground stations, dry coke quenching dust removal, coke oven flue gas, steelmaking heating furnaces, hot blast stoves, power plant boilers, and waste incineration industrial kilns, achieving ultra-low emission desulfurization.

High-activity, high-surface-area calcium hydroxide - microscopic crystalline structure under electron microscopy

Section 3: High Activity, High Specific Surface Area Calcium Hydroxide Desulfurizing Agent Specifications

Section 4: Recommended Usage Conditions for High-activity, High-Surface Area Calcium Hydroxide

Section 5: High Activity, High Specific Surface Area Calcium Hydroxide Characteristics

Highly active, high specific surface area calcium hydroxide boasts characteristics such as porosity, high activity, good dispersibility, and high utilization rates. Its specific surface area is 3-4 times that of regular calcium hydroxide, and it is widely recognized as an excellent dry desulfurization product internationally. The practical dry desulfurization agents mainly include high specific surface area calcium hydroxide and baking soda. While baking soda has a rapid reaction rate, it is relatively expensive and difficult to dispose of solid waste. In the 1980s, high specific surface area calcium hydroxide was extensively used in waste-to-energy power plants and thermal power plants for desulfurization in Europe, America, and Japan, successfully replacing baking soda. High specific surface area calcium hydroxide has well-developed pores, and can quickly adsorb and absorb HCl and SO2 in flue gas, achieving a utilization rate of over 85%.

Section 6: Introduction to HNPS Dry Desulfurization Process

Highly active and high surface area calcium hydroxide dry powder desulfurizer, directly jetted into the flue gas duct through air conveying, rapidly disperses in the flue gas under the action of an efficient jetting device, adsorbing and absorbing most of the acidic media such as F-, Cl-, SO2, and SO3 in the flue gas, and enters the bag filter with the flue gas. A small portion of the acidic media continues to react in the bag filter, and the flue gas after desulfurization is directly discharged by the induced draft fan.

This process is unaffected by the temperature of the smoke, and 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 rotary feeder, measured by frequency conversion through sensors.

3. Power System: Positive pressure conveying with a 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 main operating states or parameters such as material level and feeder operation frequency. The system is equipped with high and low material level alarms, material level display, and status and fault alarms for the Roots blower.

Section 8: Characteristics of High-activity, High-specific-surface-area Dry Desulfurization Calcium Hydroxide

1. Meets ultra-low emission requirements, with high desulfurization efficiency; SO2 outlet concentration can reach near-zero emission levels; flue gas SO2 concentration ranges between 40~300 mg/Nm3, particularly cost-effective.

2. Wide temperature range, with flue gas treatment at 30-350°C, achieving high desulfurization efficiency.

3. The process is simple, with ultra-fine powder directly sprayed into the flue gas duct through an efficient jet, completing the absorption reaction during the flow of flue gas.

4. Ensure the system meets ultra-low dust emission requirements with either the existing or newly added bag dust collector.

5. By-products are general solid waste, specifically saturated waste desulfurizer, with primary constituents being CaSO4, Ca(OH)2, and CaCO3.

6. Centralized control room operation without increasing personnel, small equipment footprint, especially suitable for low-temperature, low-sulfur environments.

7. Replacing the baking soda process with an alternative, cost-effective investment, low energy consumption, and waste disposal solutions.

Section 9: Typical Performance in Various Industries

   Coking Industry - Coke Pushing StationShougang Qian'an Sinochem Coal Chemical Co., Ltd. 1st, 2nd, and 3rd coke ovens - coke pushing dust removal system 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. Coke Industry - Dry Quenching Gas and Coke Oven Flue Gas - High-activity, High-specific surface area calcium hydroxide desulfurization

3. Iron and Steel Industry - Hot Blast Furnace, Heating Furnace - High Activity, High Specific Surface Area Calcium Hydroxide Desulfurization

4. Other Industries - Waste-to-Energy Power Plants & Power Station Boilers - High Activity, High Specific Surface Area Calcium Hydroxide Desulfurization