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 waste acid or wastewater discharge, minimal equipment corrosion, no significant cooling of flue gas during purification, high flue gas temperature after purification, beneficial 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.

I. 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, with mature technology and stable operation. The SDS desulfurization process route using sodium bicarbonate as the alkali source has rapidly expanded its market share due to its high desulfurization efficiency, broad source 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..The material has excellent water solubility and is classified as general solid waste that is difficult to dispose of in compliance with regulations. Authoritative statistics show that the coking industry alone produces up to 300,000 tons of sodium-based desulfurization ash annually. This figure is further increased by power plants, hot air furnaces, and heating furnaces in steel enterprises, as well as glass and cement kilns. Some companies rent land to build storage warehouses for disposal, while others sell it to qualified institutions for processing, with costs varying from 300 to 500 yuan per ton, adding to the burden on businesses.

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 violations. 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, we have successfully developed high surface area calcium hydroxide with a BET surface area 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 with superior product performance!

Utilizing the HNPS desulfurization system developed by our company, over 30 sets of units have been industrially applied with excellent operational data, low costs, and satisfied customers. Currently, the ultra-low emission desulfurization technology has been successfully applied in coking furnace 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.

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

Section 3: High-activity, high-specific-surface-area calcium hydroxide desulfurization agent specifications

Four. Reference Usage Conditions for High Activity, High Specific Surface Area Calcium Hydroxide

Five. High-activity, high-specific-surface-area calcium hydroxide characteristics

Highly active, high surface area calcium hydroxide boasts characteristics such as porosity, high activity, good dispersion, and high utilization. Its specific surface area is 3-4 times that of ordinary calcium hydroxide and is recognized internationally as an excellent dry desulfurization product. Dry desulfurization agents used in practice are primarily 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. By the 1980s, high surface area calcium hydroxide had been widely used in waste-to-energy and thermal power plants in Europe, America, and Japan, successfully replacing baking soda. High surface area calcium hydroxide has well-developed pores, allowing for rapid adsorption and absorption reactions of HCl and SO2 in flue gas, achieving a utilization rate of over 85%.

Section 6: Introduction to HNPS Dry Desulfurization Process

Highly active, high surface area calcium hydroxide dry powder desulfurizer, directly喷射 into the flue gas duct by air conveying, rapidly dispersing into the flue gas under the action of the high-efficiency jet, adsorbing and absorbing most of the acidic media such as F-, Cl-, SO2, and SO3 in the flue gas, and entering the bag filter with the flue gas. A small portion of the acidic media continues to react in the bag filter, and the烟气 after desulfurization is directly discharged through 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 disks, and other accessories.

2. Feeding System: Utilizes a high-precision rotary feeder for material feeding, with frequency conversion and measurement via sensors.

3. Power System: Positive pressure conveying with Roots blower or compressed air, one in operation and one in reserve.

4. Control System: Centralized control in the control room, with computer screen displaying main operating states or parameters such as material level and feeder operation frequency. The system includes high and low level alarms, material level display, status of the Roots blower, and fault alarms.

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

1. Meets ultra-low emissions requirements with high desulfurization efficiency; the SO2 concentration in the exhaust can reach near-zero emission levels; flue gas SO2 concentration is 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 being directly sprayed into the flue gas channel through an efficient jet, completing the absorption reaction during the flow of flue gas.

4. Ensure system dust emissions meet ultra-low requirements for existing or newly added bag dust collectors.

5. By-products are general solid waste, specifically saturated waste desulfurizer, mainly consisting of CaSO4, Ca(OH)2, and CaCO3.

6. Centralized control room operation without increasing staff, with minimal equipment floor space, especially suitable for low-temperature, low-sulfur environments.

7. Substitute the baking soda process with a more cost-effective, low-energy consumption alternative, addressing solid waste issues.

Section 9: Typical Performance across Various Industries

   Coking Industry - Coke Pushing StationShougang Qian'an Sinochem Coal Chemical Co., Ltd. #1, #2, and #3 coke ovens - Push coke surface dust removal 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 Specific 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