Waste incineration power generation is an important new energy industry related to people's livelihood.China has basically clarified the development direction of industrialization and marketization of waste treatment from the perspective of industrial policy.Since 2016, the state has formulated a series of policies and measures to promote the sustainable and healthy development of waste incineration power generation. The National Energy Administration, the former ministry of environmental protection, and the ministry of housing and urban construction have also issued relevant documents to support the development of waste incineration power generation industry.
However, as a pre-work of garbage incineration power generation, the methods related to garbage classification and recycling have not been clarified and implemented, and there are not enough constraints and incentive mechanisms to make garbage classification universal, which cannot create good conditions for harmless garbage treatment and garbage incineration power generation.At the same time, the corresponding design, manufacturing specifications, standard boxes of various investment, tax, subsidies and other policies still need to be further improved, especially the garbage treatment subsidies policy, in the vicious competition appeared unstable phenomenon.It is the key to formulate corresponding preferential policies for waste incineration power generation in developed countries. Without preferential policies and various subsidies, it is difficult for waste incineration power generation to be industrialized.Therefore, the relevant laws and policies of waste incineration power generation industry and related policies, norms and economic policies are to be improved.
In order to achieve environmental protection and low nitrogen emission, gas boiler should consider from three aspects. First, confirm whether the furnace meets the needs of low nitrogen combustion from the heat load parameters of furnace volume and furnace size.Second, confirm the application of low nitrogen combustion technology from the perspective of burner and report the test results in actual use;Three related equipment matching to confirm its rationality from a combustion system, such as single and double fan parameters, flue gas recycling rate, smoke wind mixing way, the precipitation of condensate solution, cold air heating measures, FGR flame stability, FGR impact on the boiler thermal efficiency and so on, analyzed and equipment selection of boiler running safety, stability, the influence of load rate, especially the FGR flame stability of furnace vibration influence;Finally, the conclusion is drawn whether the selected boiler meets the requirement of low nitrogen environmental protection emission.
In addition to the installation of the fan in accordance with the relevant standards and in accordance with the design drawing requirements for construction.The fan shall be installed in a position to ensure normal operation and easy maintenance of the required controls.
During installation, it is recommended that the fan and the air duct adopt soft connection (flexible material and non-combustion), the length should not be less than 200mm, and the pipe diameter should be the same as the inlet and outlet size of the fan.In order to ensure that the soft connection does not appear distortion in the process of system debugging, the installation should be moderately tight.The pipe diameter of the smoke and air duct at the outlet of the fan can only be enlarged, not reduced.Pay attention to the direction of airflow if there is a guide plate in soft connection.
A soft connection is also suggested between the inlet of the burner and the air duct, and the air duct between the blower and the burner should maintain a certain Angle.Vertical arrangement is not easy to cause uneven combustion and vibration.Fan into the tuyere are generally adjustable door, the installation of inlet damper should pay attention to whether the direction of guide flow formed by the blade Angle when opened is consistent with the impeller rotation direction.
Five-low technology
Low –CO technology
Low-NOx technology
Low O2 technology
Low noise technology
Low power consumption technology
From the perspective of heat transfer calculation, the measures to reduce the smoke exhaust temperature are analyzed from the following aspects: increasing the heat exchange surface, improving the heat exchange efficiency of the heating surface, improving the heat exchange temperature difference by using a lower temperature source, and reducing the influence of corrosion on the heat exchange efficiency.As gas boiler host first meet the low nitrogen flame furnace volume and size requirements, the second host of convection heating surface is a main export in order to reduce the smoke temperature, general control in 150 ~ 250 ° C, in order to avoid the smoke temperature increases along with the flue design difficulty of heat preservation, high smoking temperature is too low will cause corrosion in furnace convection heating surface forming wall condensation, therefore, furnace domestic demand to design proper heating surface, the physical dimension more representative chamber size.Increasing the heat exchange surface should mainly consider increasing the heat exchange area of the equipment in the rear of the boiler, which is more favorable for rapidly reducing the exhaust temperature.The second is to have a lower inlet water temperature can be used for heat exchange temperature difference characteristics;Third, corrosion resistant materials can be used to improve its service life.The new structure of efficient heat exchange mainly adopts the form of staggered tube arrangement, efficient heat exchange finned tube, plate heat exchanger, etc., to increase the flue gas disturbance and contact surface, reduce the heat resistance of flue gas stratification, and improve the heat exchange efficiency of medium and flue gas.
The development of hydrogen-rich tail gas burner is to reuse the hydrogen-rich tail gas discharged from air for a long time, thus improving the utilization rate of hydrogen-rich tail gas and saving production cost.At the same time, hydrogen-rich tail gas burner plays a positive role in promoting energy conservation and emission reduction, and will play a positive role in promoting the environmental protection and the technological progress, development and expansion of the burner industry, producing good social benefits.
——Author：ebico