Seeking a flue gas desulfurization process with high concentrations of SO2 30

Shandong Guoshun Construction Group has been desulfurizing for 30 years.

When designing the smelting flue gas purification process with a sulfur dioxide concentration of 8%, a combination of wet tower desulfurization and bag filter to remove dust can be considered.

Wet desulfurization typically involves passing flue gas through a scrubber, which contains an absorbent, such as limestone or sodium hydroxide solution, to absorb sulphur dioxide. The process forms a compound (such as calcium sulfate or sodium sulfate) that removes sulfur dioxide from the flue gas. After desulfurization, the flue gas is emitted into the atmosphere, and its sulfur dioxide concentration will be greatly reduced.

For the bag filter, it is a technology to remove the dust in the flue gas by filtration. The bag filter is generally composed of several filter bags, and the flue gas enters the inside of the filter bag from the outside of the filter bag, and the dust is filtered by the filter bag and remains in the bag. The dust accumulated on the filter bag needs to be cleaned after a certain period of time, and the commonly used methods include mechanical vibration, pressure and careful air injection.

When designing wet towers and baghouses, the following factors need to be considered:

Factors such as the selection of absorbent for the wet column, the design of the scrubber and the adjustment of operating parameters have been described in the previous question.

The selection and quantity of filter bag materials for the bag filter need to be determined according to the dust composition, concentration and flow rate in the flue gas. The materials of filter bags generally include polyester, polypropylene, glass fiber, etc., and the commonly used filter bags are needle-punched felt bags, heat-setting felt bags, etc. The number of filter bags can be calculated based on the flue gas flow and dust load.

Cleaning method of bag filter: The cleaning method needs to be selected according to the material of the filter bag, the composition and characteristics of the flue gas, and the conditions of the cleaning equipment. Commonly used cleaning methods include mechanical rapping, compressed air injection, electric shock, etc.

In general, for the smelting flue gas purification process with a sulfur dioxide concentration of 8%, a combination of wet tower desulfurization and bag filter dust removal can be adopted. Various factors need to be considered in the design, such as the selection of absorbent for the wet tower, the design and adjustment of the operating parameters of the scrubber, the selection and quantity of filter bag materials for the bag filter, and the selection of the ash cleaning method. In the end, it needs to be adjusted and optimized according to the actual situation to achieve the best purification effect.

Flue gas desulfurization (FGD) is an effective desulfurization method for large-scale applications in the industrial industry. According to the form of sulfide absorbent and by-products, desulfurization technology can be divided into three types: dry, semi-dry and wet. The dry desulfurization process mainly uses a solid absorbent to remove SO2 in the flue gas, generally sprays the limestone fine powder into the furnace to decompose it into CAO by heating, absorbs the SO2 in the flue gas, generates CASO3, and collects it with fly ash in the dust collector or discharged it through the chimney.

Wet flue gas desulfurization is the use of liquid absorbent under ionic conditions of gas-liquid reaction, and then remove SO2 in the flue gas, the equipment used in the system is simple, the operation is stable and reliable, and the desulfurization efficiency is high. The biggest advantage of dry desulfurization is that there is no discharge of waste water and waste acid in the treatment, which reduces secondary pollution; The disadvantage is that the desulfurization efficiency is low and the equipment is huge. Wet desulfurization uses liquid absorbent to wash the flue gas to remove SO2, the equipment used is relatively simple, easy to operate, and the desulfurization efficiency is high; However, the flue gas temperature after desulfurization is lower, and the corrosion of the equipment is more serious than that of the dry method.

Limestone (lime) gypsum wet flue gas desulfurization process.

Limestone (lime) wet desulfurization technology has been widely used in the field of wet FGD due to the low and easy availability of absorbents.

Characteristics of flue gas in coking plants.

1. The temperature range of coke oven flue gas is basically 180-300 degrees, and the temperature fluctuation range is large;

2. The composition of coke oven flue gas is complex, and the NOx content is high, and the concentration is generally 350mg NM3-1200mg NM3;

3. The flue gas of the coke oven in Zhenzhou contains S02, which is slowly shielded in the temperature range of 180 degrees to 230 degrees, and S02 is easy to react with ammonia to convert into ammonium sulfate, resulting in pipeline blockage and equipment corrosion;

4. The coke oven chimney must always be in a hot standby state. That is to say, after the flue gas is desulfurized and denitrified, the final discharge temperature must be guaranteed to be about 130 degrees.

Coking plant selectionSDS sodium bicarbonate dry desulfurizationCauses.

1.Wide range of applications.

SDS sodium bicarbonate dry desulfurizationSuitable for all types of flue gases, including sulphur dioxide in coking plant flue gases. Therefore, SDS sodium bicarbonate dry desulfurization can meet the desulfurization needs of coking plants.

2.High desulfurization efficiency.

SDS sodium bicarbonate dry desulfurizationThe sulfur dioxide in the flue gas can be removed in a relatively short time, and the desulfurization efficiency is high, which can effectively reduce the environmental impact of the coking plant.

3.No secondary pollution.

SDS sodium bicarbonate dry desulfurizationAfter treatment, there is no secondary pollution problem, which can reduce the investment cost of secondary pollution treatment in the second brigade cave of the coking plant and reduce the impact on the environment.

4.The technology is mature.

SDS sodium bicarbonate dry desulfurizationIt has been widely used in industrial production, with mature technology, simple operation and easy implementation.

1. The temperature is not high.

2. Ingredients.

3. The sulfur content is not high.

The reason for the selection of SDS desulfurization for flue gas desulfurization in coking plants.

When coking enterprises are in production, the main flue gas component is sulfide, which is toxic, which will seriously damage the surrounding environment, affect human health and corporate image, so it is necessary to desulfurize the flue gas.

The significance of flue gas desulfurization in coking plants:

1. It can prevent the corrosion of equipment, reduce equipment maintenance costs and reduce production costs.

2. Improve the quality of coke oven gas, reduce the pollution generated by coke oven gas combustion, and protect the surrounding environment.

3. Reducing the content of hydrogen sulfide in the gas used by iron and steel enterprises can enable iron and steel enterprises to produce high-quality steel.

4. The sulfur can be used in the fields of medicine and chemical industry.

Based on the significance of flue gas desulfurization in coking plants, Boleda SDS dry desulfurization can perfectly meet the choice of flue gas desulfurization in coking plants

SDS dry desulfurization is the use of desulfurization reactor to inject flue gas and sodium bicarbonate (baking soda) into the desulfurization reactor at the same time, under the action of additives, sodium bicarbonate is activated by high temperature, decomposed into sodium carbonate, sodium carbonate and flue gas are highly mixed, sodium sulfate and other sodium salts are generated, so that the flue gas is discharged up to the standard.

Advantages of using SDS dry desulfurization system:

1.It can continue to meet the emission standards, and the desulfurization efficiency is more than 95%;

2.The equipment occupies a small area, the site is not restricted, the power consumption rate is low, the failure rate is also low, and the equipment life is increased;

3.The low temperature of the desulfurization system only needs about 10 °C, 4The desulfurization system runs in a dry state, there is no wastewater treatment and discharge problem, there is no chimney land combustion and tailing site, no need for whitening, no secondary pollution.