Uniform-temperature superheater for waste incineration boiler and superheated steam heating method

Abstract

The invention discloses a uniform-temperature superheater for a waste incineration boiler and a superheated steam heating method. The uniform-temperature superheater comprises a plurality of unit tube groups, wherein each unit tube group comprises an inlet mixer, an outlet mixer and a plurality of U-shaped superheating tubes which are connected between the inlet mixer and the outlet mixer in parallel; and the plurality of unit tube groups are sequentially arrayed, wherein the outlet mixer of the previous unit tube group is connected with the inlet mixer of the next unit tube group through a plurality of connection tubes which are connected in parallel. The uniform-temperature superheater disclosed by the invention is convenient to manufacture, short in tube pass, capable of improving the uniformity of the flow rate and the flow speed of steam in each section of tube and enabling the temperature of each section of tube to be balanced, and capable of preventing that the temperatures of the tubes are too high to accelerate corrosion to cause tube burst, thus benefiting to long-time stable running of the boiler.

Description

technical field [0001] The invention relates to a superheater and a superheated steam heating method, in particular to a uniform temperature superheater and a superheated steam heating method for a garbage incineration boiler. Background technique [0002] In the 21st century, with the improvement of people's living standards, the amount of garbage generated is also increasing. Many large cities have formed a dilemma surrounded by garbage, and the problem of garbage treatment and disposal has been placed before us. Incineration power generation is the most effective way to deal with urban domestic waste. It can not only achieve the purpose of reducing the volume to the greatest extent, but also the flue gas can meet the environmental protection standards stipulated by the state after treatment, so as not to cause secondary pollution. The heat energy released by waste incineration It can also be used to reduce the use of coal and reduce carbon emissions. Waste incineration p...

AI Technical Summary

Problems solved by technology

[0014] conventional superheater figure 2 , image 3 As shown, it includes an inlet mixer 7, an outlet mixer 8, and several serpentine tubes 9 connected in parallel between the inlet mixer 7 and the outlet mixer 8. The serpentine tubes 9 are heated by the flue gas while heating the superheated steam in the tube. ; When in use, the superheated steam is introduced from the inlet mixer 7, and is discharged from the outlet mixer 8 after being heated by several serpentine tubes 9 in the flue; 9 has a long tube length and many elbows, which is not only difficult to process, but also has a large error in manufacturing accuracy. In particular, it is difficult to ensure a uniform cross-section inside the tube. In the process of heating superheated steam, it is impossible to completely guarantee the steam in each tube. The flow rate is equal and the flow rate is balanced. Therefore, due to the low steam flow rate of some serpentine tubes 9, the temperature of the tube wall at the local position is high. Due to the long tube path, the steam temperature deviation will gradually superimpose, and the accumulation will increase, resulting in local metal on the heating surface tube. The temperature is higher than other areas, and the deviation is large, which accelerates the high-temperature corrosion in this local area, and eventually the phenomenon of superheater tube burst occurs, and the long-term stable operation of the boiler cannot be guaranteed.

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