★Wet Flue Gas Desulfurization (WFGD)
Wet flue gas desulfurization is the most widely used and most efficient flue gas desulfurization technology. It is mainly used to control sulfur dioxide (SO₂) emissions in flue gas and is widely used in coal-fired power plants, steel, chemical, cement and other industries.
Its working principle is to spray limestone slurry or other alkaline liquids into flue gas, and use the absorbent to react chemically with sulfur dioxide to generate neutral salts such as calcium sulfite or calcium sulfate, thereby achieving desulfurization. The most typical process is the limestone-gypsum method.
The main features of wet desulfurization include the following aspects:
High desulfurization efficiency: It can reach more than 95%, meeting national and local environmental protection requirements for ultra-low emissions.
Mature and reliable technology: This process has been widely used worldwide, with complete supporting technologies and stable operation.
By-product resource utilization: Reaction products such as gypsum can be used in the building materials industry to achieve waste utilization.
The equipment system is complex: it requires multiple auxiliary systems such as slurry circulation, dehydration, limestone pulping, etc., with large investment and land occupation.
There is a wastewater problem: the system will produce a certain amount of wastewater during operation, and a water treatment device is required.
The operation and maintenance requirements are high: it involves slurry transportation, scaling control, corrosion prevention and other issues.
★SCR denitrification (Selective Catalytic Reduction)
SCR denitrification is currently the most effective and most commonly used nitrogen oxide (NOₓ) treatment technology, and is widely used in thermal power plants, waste incinerators, glass kilns, steel sintering heads and other fields.
The principle is to spray ammonia or urea into the flue gas under appropriate temperature (usually 300 to 400℃), and react with nitrogen oxides in the flue gas under the action of a catalyst (such as V₂O₅/TiO₂) to generate harmless nitrogen and water.
The main features of SCR denitrification are as follows:
High denitrification efficiency: up to 90% to 95%, it is one of the most effective technical means to control NOₓ emissions.
No wastewater and waste residue are generated: the reaction products are nitrogen and water, and no by-products need to be treated.
Mature technology: widely used in power plants and large industrial boilers, with rich engineering experience.
High equipment investment: the catalyst in the system is expensive, and the initial investment and maintenance costs are high.
Strict operation requirements: the catalytic reaction has high requirements for temperature and ammonia control, and the system needs to be precisely controlled to avoid ammonia escape.
The catalyst needs to be replaced regularly: the catalyst life is generally 2 to 4 years, and it needs to be replaced periodically, increasing the operation and maintenance costs.
★Combination and summary
Wet desulfurization and SCR denitrification are often used as supporting systems for flue gas pollutant treatment, arranged one after the other in the flue gas path, to meet the ultra-low emission requirements of SO₂ and NOₓ at the same time. In typical applications, the SCR device is usually arranged in the high-temperature area at the boiler outlet, while the wet desulfurization device is located at the back end of the system for final desulfurization and flue gas cooling.
The combined use of these two technologies in environmental protection can effectively control the main gaseous pollutants and ensure that emissions meet standards. It is suitable for industries with strict environmental protection standards such as thermal power, steel, and building materials.

★Company Introduction

Yancheng Hongcheng Chaoyu Environmental Protection Co., Ltd. is a national high-tech enterprise specializing in the research and development, production, sales, installation, commissioning and service of environmental protection and energy-saving equipment such as atmospheric environment treatment, waste gas treatment and sewage treatment. It is a well-known domestic manufacturer, system integrator and general contractor of dust removal, desulfurization and denitrification, ultra-low emission, waste gas treatment and sewage treatment equipment. The various types of dust removal equipment, desulfurization and denitrification equipment, sewage treatment and other environmental protection and energy-saving equipment produced by the company are advanced in technology and reliable in quality. They are widely used in thermal power, coking, garbage power generation, chemical industry, papermaking, steel, metallurgy, carbon, glass, cement building materials and other industries. The products are sold to more than 20 provinces and cities across the country and have been widely praised by customers.

★Factory Appearance

★FAQ

Q. How high is the dust removal efficiency of bag filters?
A. The dust removal efficiency can generally reach more than 99%, and can effectively filter fine dust above 0.3 microns.

Q. Can bag filter handle high temperature gas?
A. It can handle high temperature gas up to about 250℃. It needs to use high temperature resistant filter material and control the temperature and humidity of the gas.

Q. How to extend the service life of bag filter?
A. Choose appropriate filter material, clean dust on time, avoid high temperature shock and dust blockage, and perform regular inspection and maintenance.