Research and application of desulfurization magnesium oxide technology

1 research background

In order to improve and improve the quality of the atmospheric environment, Beijing Municipality began to implement emergency measures to control air pollution in 1998. In 2002, it also issued DB11/139-2002 "Integrated Emission Standards for Boiler Pollutants" in line with international standards, according to which The second period standard that began to be implemented on November 1, 2003, the existing boilers, even a large number of boilers equipped with a waste water film dust collector, SO2, smoke and other pollutants in the exhaust gas can not meet the standard.

For a large number of boiler desulfurization magnesia equipped with a waste water membrane dust collector, the outflow of flue gas can not reach the standard. If all demolition or partial demolition is adopted, then the flue gas desulfurization and dedusting facilities will be re-introduced, which not only has a large investment, but also generates a large amount of Solid waste, which is difficult to handle, is difficult for enterprises, especially those with limited funds. At present, the best way is to meet the status quo, with more provincial investment and lower operating costs to meet new and stricter emission standards. Based on this, a new high-efficiency water-membrane desulfurization and dedusting technology was successfully developed. In 2002, it was successfully applied at Beijing University of Posts and Telecommunications (20t/h heating boiler), followed by Beijing Yanjing Beer Co., Ltd. (20t/h industrial). The steam boiler) was successfully applied again.

2 prospects of flue gas desulfurization technology

In view of China's weak economic strength and the increasingly international standards of environmental standards, we cannot choose the current mode of high-input control of environmental problems in industrialized countries, based on domestic, relying on its own technology, research on investment provinces, low operating costs, and good processing results. The domestically produced flue gas desulfurization technology is the only way to make the enterprise affordable and affordable, and it has broad practical prospects in China.

The following are some of the practical techniques that have worked well in recent years in China.

The two invention patent technologies invented by Cheng Zhijiu and Yin Guangyu are all authorized, the first item, “Integrated Method and Equipment for Semi-dry Flue Gas Desulfurization and Production of Magnetic Fertilizer” (Certificate No.: 86016), Second Item, “Method for treating flue gas residual coke or residual coke wastewater” (Certificate No. 84133), the two invention patents solve the problem of high cost of flue gas desulfurization, which are semi-dry desulfurization technologies. It is a special equipment in the patented technology to integrate high-concentration refractory organic industrial wastewater such as flue gas desulfurization and coking. It is a waste treatment technology, which not only has good treatment effect, but also has low investment and low operating cost. Zero discharge after treatment, does not produce the advantage of secondary pollution.

In addition, the wet tray desulfurization technology of the leakage layer of the leakage tray, the wet desulfurization technology of the cyclone swirling layer, and the wet exhaust gas desulfurization technology of the two technologies are currently applied in China, all of which are desulfurization and dust removal. The integrated technology has the characteristics of fast, high efficiency and practicality.

The new technology of high-efficiency and high-efficiency desulfurization magnesia, the treatment of boiler flue gas, especially the boiler flue gas which has been equipped with the waste water membrane dust collector, can be the most suitable environmental protection and practical technology for desulfurization and dust removal integrated with China's national conditions. Small amount, fast on the horse, no additional land occupation; low investment, low operating cost, high efficiency of desulfurization and dust removal; equipment does not scale, does not block, does not bring water, does not produce the huge advantage of secondary pollution.

According to the State Council's reply on the “10th Five-Year Plan” for the prevention and control of acid rain and sulfur dioxide pollution in the two control areas: to ensure that the sulfur dioxide emissions in the two control areas in 2005 decreased by 20% compared with 2000.

According to statistics, in 2000, the total amount of sulfur dioxide emissions in China was 1.95 million tons, while the sulfur dioxide emissions in the two control areas were 13.164 million tons, accounting for 66% of the total. According to the requirements of the 10th Five-Year Plan, by 2005, two controls The amount of sulfur dioxide emissions in the region can not only be increased, but also reduced by 20% compared with 2000, that is, 2.633 million tons. It can be seen that the task of preventing and controlling sulfur dioxide pollution in the two control areas in China is very arduous.

3 new technology of water film cyclone desulfurization and dust removal

On the basis of retaining the raw water film dust collector, the boiler with the water film dust collector is only modified inside the main tower, that is, the external water film dust collector has the same external structure, and the layout of the working site is basically Maintaining the status quo, there is no separate land occupation.

A cyclone, a turbulator, a water retainer and a spray facility were added to the main tower. Among them, the cyclone, turbulence and spray facilities are made of 316 stainless steel. The following is an example of Beijing University of Posts and Telecommunications, which introduces the operating parameters and operation results of the process equipment.