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Integrated flue gas treatment equipment for desulfurization, denitrification, and dust removal
Flue gas is discharged from the flue at the rear of the boiler. The flue gas temperature is 300℃. Desulfurization is achieved after the flue gas comes into contact with and reacts with the desulfurization alkaline agent in the flue. Before entering the integrated denitrification and dust removal equipment, the desulfurized flue gas comes into contact with and is uniformly mixed with the aqueous ammonia sprayed into the flue. Then, denitrification is achieved through the action of the SCR catalyst on the surface of the high-temperature composite filter cartridge. The dust in the flue gas is removed after passing through the high-temperature composite filter cartridge, and the clean flue gas is sent back to the original flue. After waste heat recovery, the flue gas is finally discharged to meet the standards.
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Details Description
Flue gas is discharged from the flue at the rear of the boiler. The flue gas temperature is 300℃. After contacting and reacting with the desulfurization alkaline agent in the flue, the flue gas undergoes desulfurization. Before entering the integrated denitrification and dust removal equipment, the desulfurized flue gas contacts and mixes evenly with the ammonia water injected into the flue. Then, denitrification is achieved through the action of the SCR catalyst on the surface of the high-temperature composite filter cartridge. The dust in the flue gas is removed after being filtered by the high-temperature composite filter cartridge, and the clean flue gas is sent back to the original flue. After waste heat recovery, the flue gas is finally discharged to meet the standards.
The core technology of this integrated flue gas desulfurization, denitrification, and dust removal system is the high-temperature composite filter cartridge (ceramic fiber filter tube). The filter cartridge is made of high-strength, high-porosity, and low-density materials. The base material is composed of aluminosilicate fibers and inorganic binders. It has thermal shock resistance (not affected by thermal expansion and contraction), high temperature resistance, corrosion resistance, and strong body rigidity, requiring no frame support. The optimal operating temperature range is 250-350℃. By loading a catalyst on the filter cartridge, the filter cartridge simultaneously has excellent denitrification and dust removal capabilities. In combination with dry desulfurization, it can achieve integrated removal of sulfur, dust, and nitrogen oxides in the flue gas.
High-Temperature Composite Filter Cartridge Product Introduction
The high-temperature composite filter cartridge is made of high-strength, high-porosity, and low-density materials. The base material is composed of aluminosilicate fibers and inorganic binders. It has thermal shock resistance (not affected by thermal expansion and contraction), high temperature resistance, corrosion resistance, and strong body rigidity, requiring no frame support. The optimal operating temperature range is 250-350℃. By loading an SCR catalyst on the filter cartridge, the filter cartridge simultaneously has excellent denitrification and dust removal capabilities. In combination with dry desulfurization, it can achieve the effect of integrated removal of sulfur, dust, and nitrogen oxides in flue gas purification.
Technical Advancement Description:
1. Long service life: Service life ≥10 years, superior to traditional dust collectors (filter bags).
2. Auxiliary desulfurization: Using a dry method, different alkaline agents such as sodium bicarbonate (NaHCO3) or slaked lime Ca(OH)2 are used to remove acidic gases (SO2, HCL, HF...). The filter cartridge dust collector can be regarded as a desulfurization reaction chamber, forming a fixed bed of slaked lime filter cake outside the filter cartridge to improve the reaction effect.
3. Easy installation: The filter cartridge can be inserted into a prefabricated flower plate and fixed. Compared with other SCR technologies, the construction period is short, and the installation difficulty is small. The floor area is relatively reduced, saving about 25~35% of the overall cost.
4. Replacement of traditional filter bags: Currently, it is a unique innovative technology that can operate at temperatures above 300℃ (ordinary filter bags cannot reach this temperature range); high-pressure pulse backwashing dust removal is used, which is basically the same as traditional bag-type pulse backwashing dust removal.
5. High temperature resistance and corrosion resistance: For traditional bag-type dust collector filter bags, when high-temperature dust from incomplete combustion falls on the filter bag, it will cause the filter bag to break. The high-temperature composite filter cartridge can be used for a long time in a high-temperature environment (900℃ for a short time), providing higher filtration efficiency and maintaining stable performance. It is more resistant to high temperatures and corrosive chemicals than traditional bag-type dust collector filter bags.
6. Heat recovery function: After high-temperature dust removal and acid removal, clean flue gas can improve heat recovery efficiency and reduce corrosion and wear of the heat exchanger.
7. High removal rate: The filter cartridge made of high-density composite fibers maximizes the residence time and removal efficiency. The particulate matter concentration in the flue gas is less than 10mg/Nm3 or even lower.
Desulfurization Process Introduction
Sodium bicarbonate is used as the desulfurization alkaline agent for flue gas desulfurization, implementing dry flue gas desulfurization technology. The specific process is that the desulfurization alkaline agent enters the alkaline agent storage bin, is processed by a crushing device to reach a certain particle size (500-600 mesh), and the powder is injected into the flue via compressed air, reacting with sulfur dioxide in the flue gas to generate sodium sulfite or sodium sulfate and other sulfates. The desulfurization efficiency can reach more than 95% (depending on the amount of sodium bicarbonate injected). The acidic salt is in the form of solid powder and will not cause scaling or blockage of the flue or pipeline.
Denitrification Process Introduction
20% concentration ammonia water is used as a reducing agent for denitrification, atomized in the flue using a compressed air two-phase flow atomizing spray gun, and after fully mixing with the flue gas, it enters the high-temperature composite filter cartridge integrated dust collector. In the dust collector, NOX and NH3 in the flue gas undergo oxidation-reduction reactions under the action of the catalyst on the filter cartridge, generating N2 and H2O, completing the denitrification process. Due to the very small particle size of the catalyst, nanometer level, and the large surface area of the filter cartridge, this greatly increases the active surface area and reaction rate of the catalyst, and also increases the residence time of the flue gas, maximizing the removal efficiency.
Dust Removal Process Introduction
Unlike traditional bag dust collectors, the high-temperature composite filter cartridge dust collector combines the characteristics of high-temperature composite filter cartridge single-body structure, high porosity, 2-3 micron ultra-fine fibers, non-reactive with chemicals, high-temperature resistance (750℃), and corrosion resistance, giving the dust collector extremely high filtration efficiency and service life.
The dust particle concentration in the flue gas can be rapidly reduced after passing through the dust collector, to below 5mg/Nm3 or even lower. The dust particles are collected in the hopper of the dust collector and sent to a designated location for processing via a dust discharge device.
Application Areas
Metallurgy industry: Used for flue gas treatment in coke ovens, heating furnaces, and steel plants.
Power industry: Flue gas treatment for biomass boilers, coal-fired power plant boilers, and garbage incinerators (dioxins).
Building materials industry: Tail gas treatment for cement plant rotary kilns, glass kilns, and carbon black plants, etc.
Chemical industry: Purification of dusty gases generated during various chemical production processes.
Actual Case Photos:
130-ton biomass boiler power plant 30MW, integrated dust removal, desulfurization, and denitrification, China 2019
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130-ton biomass boiler power plant 30MW, integrated dust removal, desulfurization, and denitrification, China 2018
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150-ton coal-fired boiler integrated dust removal, desulfurization, and denitrification, China 2021
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Integrated desulfurization and denitrification of coke ovens in steel plants, China 2023
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Integrated dust removal, desulfurization, and denitrification technology for glass kilns in China, 2023
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