Desulfurization and Denitrification Technical Solution
1. DESULFURIZATION PROCESS FOW
Wet method: large wet method, ammonia method, single alkali method, double alkali method, etc
Semi dry method: CFB circulating fluidized bed desulfurization, SDA rotary atomization desulfurization
Dry method: SDS baking soda desulfurization, fixed bed (moving bed) dry desulfurization
According to the flue gas parameters of the mine heat furnace, the wet and semi dry desulfurization process routes are not suitable for the desulfurization of mine heat furnace flue gas (combined with denitrification, comprehensive consideration is needed. If wet desulfurization is adopted, the subsequent denitrification will require too high temperature rise and energy consumption)
Based on practical experience, adopting a fixed bed (moving bed) dry desulfurization process route has low desulfurization efficiency and is prone to generating secondary dust pollution
In summary, the flue gas of the mine heating furnace adopts the SDS dry desulfurization process
Using sodium bicarbonate, the acid-base neutralization reaction involves a thermally activated pre reaction:
the freshly ground sodium bicarbonate powder comes into contact with the hot flue gas, and the small sodium bicarbonate particles quickly transform into sodium carbonate. The sodium carbonate produced by chemical pyrolysis has a high specific surface area (which can increase by more than 10 times)and porosity. Sodium car-bonate can quickly and effectively react with acidic gases, and during the process, acids(such as hydrochloric acid, sulfur dioxide, and hydrofluoric acid) are neutralized to achieve the goal of removing sulfur dioxide.
The main reaction equation is: 2NaHCO3(s)=Na2CO3(s)+H2O(g)+CO2(g)
SDS DESULFURIZATION PROCESS
Due to the generation of desulfurization ash in the SDS desulfurization process, it needs to be collected using cloth bags, while the main furnace dust collector mainly collects micro silicon powder. The owner determines whether to use desulfurization ash and micro silicon powder together based on their own needs. As per the contract, only a first stage cloth bag dust collector is needed. If it needs to be separated, a second stage cloth bag needs to be used to collect desulfurization ash and micro silicon powder separately.
Nitrogen oxides are produced during the high-temperature combustion of fossil fuels and air, and NOX includes NO, NO2, N20, N203, N204, N205, etc. The main pathways of generation include:
Thermal NOX: Nitrogen oxides produced by high-temperature oxidation of N2 in the combustion air.
Fuel type NOX: Fuel contains compounds containing nitrogen that are produced by oxidation during combustion. NOX is mainly composed of NO, accounting for over 90% of NOX (1.53).
4. SELECTIVE CATALYTIC REDUCTION
Selective Non catalytic Reduction Technology (SNCR)
Selective catalytic reduction technology (SCR)
Joint Denitration Technology (SNCR+SCR) NOX control technology during combustion process (low nitrogen combustion)
Low excess air combustion
Air staged combustion and fuel staged combustion
Gas recirculation technology
5. KEY POINTS OF SCR DENITRIFICATION PROCESS DESIGN
Key points of SCR denitrification process design
The flue gas temperature, mainly the active temperature of the catalyst
The content of sulfur dioxide in flue gas reacts with denitration reducing agents to form ammonium sulfate, which can affect the lifespan of catalysts
The selection and preparation of reducing agents mainly involve investment and operating costs
6. COMPARISON OF DENITRIFICATION TECHNOLOGIES
7.TYPES AND INSTALLATION OF SCR DENITRIFICATION CATALYSTS
8. SCR DENITRIFICATION CATALYST MODULE
Short the time for catalyst to be removed from the reactor
9.ASSEMBLY OF SCR DENITRIFICATION CATALYST
10. SELECTION OF REDUCING AGENT (AMMONIA SYSTEM)
Ammonia system (urea)hydrolysis process flow Hydrolysis includes: urea particle storage, urea dissolution, urea solution storage, hydrolysis system, product gas transportation, dilution air system.
Process description: Urea is discharged through a discharge system and dissolved in a tank, using desalinated water to produce a urea solution of 50-60%. The dissolved urea solution is transported to the urea solution storage tank. The urea solution with a concentration of 50-60% in the storage tank is transported to the ureahydrolysis reactor. The saturated steam is carried out through a coil in the hydrolysis reactor. The ammonia containing gas generated in the hydrolysis reactor enters the metering module and is diluted with dilution air
9.1 REDUCING AGENT OPERATING COSTS:
9.2 COMPOSITION OF AMMONIA SYSTEM (LIQUID AMMONIA)EQUIPMENT:
Accessories such as pipelines and valves
Optimize your environmental impact with Tianshun’s desulfurization and denitrification solution. Using SDS and SCR processes, achieve effici
