Generator set flue gas treatment

Generator set flue gas treatment

1Strengthen the level of attention

With the continuous development and progress of the times, the increasing emphasis on the treatment of flue gas in power generation units must be approached from a long-term perspective. Only by making continuous efforts in fundamental work can we promote a more sound system for the treatment of flue gas in power generation units and provide more guarantees for related issues. Secondly, in the process of handling work, it is required to handle dynamic factors and limiting conditions well. For example, after the country issued new environmental standards and the new Ten Measures for Air Quality Control, the indicators and technical content of flue gas treatment for power generation units must be well optimized, and cannot always remain at an inherent level. Otherwise, with the tightening of environmental protection, they will face the situation of unit elimination at any time. We need to explore the results of flue gas treatment for power generation units in stages, observe where there is still significant room for improvement, and identify areas that can be further consolidated. It is required to have a clear understanding of the direction and focus of flue gas treatment for power generation units, so as to make good avoidance of various problems. Overall, the work achievements are very significant.

2Improve the technical equipment system

For the treatment of flue gas from generator sets, in the future work, it is necessary to strengthen analysis and treatment in multiple aspects. If we always follow simple methods, we will definitely not achieve ideal results and may also cause irreparable losses in the specific work. Therefore, improving the technical equipment system will become a key focus of future work. The technical operation of flue gas treatment for generator sets should strengthen various aspects of work to improve the effectiveness, adhere to making significant improvements in the reliability and feasibility of work, and not always operate according to simple modes. Different technical indicators should be simulated and analyzed in advance to enhance the comprehensive achievements of technology application. Secondly, in the process of treating the flue gas of the generator set, it is necessary to make good adjustments to the equipment system and optimize it in a timely manner. For example, after the introduction of new equipment or features in the industry, it is necessary to persist in exploring and researching, and to introduce more stable functions and equipment in order to continuously achieve better results in future work.

3Desulfurization treatment

In the process of flue gas treatment for generator sets, desulfurization is a very important component that can provide significant assistance in many aspects of work. In order to achieve better results in future work, it is necessary to have a deep understanding of desulfurization methods and improve the reliability and feasibility of desulfurization. From an environmental perspective, desulfurization is a mandatory task, and even minor issues can easily have a negative impact on the overall progress of flue gas treatment for power generation units. At present, the mature and widely used flue gas desulfurization methods at home and abroad include circulating fluidized bed flue gas semi dry method, seawater method, wet ammonia method, and limestone method-Gypsum wet process. If the desulfurization device is further improved in efficiency, limestone-The wet desulfurization process technology of gypsum is mature and widely applied. Parallel towers, series towers (double tower dual cycle), and increasing the total circulation of the old tower by raising its height (single tower single cycle and single tower dual cycle) can be used as solutions. Two Heqi power plants targeted by Nanjing Longyuan Environmental Protection Co., Ltd660MWCoal fired power generation units have adopted limestone-The gypsum wet process adopts a series tower (double tower double circulation) scheme, which involves connecting a set of desulfurization absorption towers in series after the original desulfurization absorption tower (primary tower). The overall desulfurization efficiency of the design is greater than99.1%The concentration of sulfur dioxide emissions is less than35mg/Nm3.

4. Dust removal

In the process of continuous optimization and updating, the flue gas treatment of generator sets can basically make good interventions in various aspects, and many works can achieve good results. In future work, we must persist in continuously optimizing dust removal methods. Dust removal is an important indicator for the treatment of flue gas in power generation units, and can make a significant contribution to the overall work process. At present, wet electrostatic precipitators are a new type of dust removal equipment used to effectively treat trace amounts of dust and micro particles. Nanjing Longyuan Environmental Protection Co., Ltd. is targeting Guodian Quanzhou2Taiwan300MWA set of wet electrostatic precipitators is installed at the top of the secondary desulfurization tower for coal-fired power generation units, which can effectively treat gypsum rain, extremely fine water mist, smoke, heavy metals, and aerosol particles discharged after desulfurization. Design dust removal efficiency greater than75%，PM2.5The removal rate is greater than70%，SO3Removal rate greater than70%The droplet removal rate is greater than70%The concentration of smoke and dust emissions is less than5mg/Nm3.

5. Flue gas denitrification

In the flue gas of generator sets, there are a large amount of nitrogen oxides. If not treated, they can enter the atmosphere like sulfide gas, forming acid rain and causing serious environmental damage. Currently, the main denitrification method is selective catalytic reduction（SCR）Selective non catalytic reduction method（SNCR）The former has a higher catalytic efficiency due to its higher catalyst cost, while the latter mainly relies on urea or amino compounds at higher reaction temperatures（930～1090Inject flue gas at ℃, andNOxrestore toN2The technology is mature and the cost is low, but the efficiency is low. Currently operated by Nanjing Longyuan Environmental Protection Co., Ltd. at Hefei Second Power Plant2Taiwan350MWSCRThe flue gas denitrification device can ensure that the denitrification efficiency is greater than85%Ammonia escape is less than3ppm.