Boiler Tail Flue Gas Heat Utilization System
A flue gas and boiler technology, which is applied in the field of boiler tail flue gas heat utilization system, can solve the problems of little boiler efficiency, limited working ability, and inability to reduce the exhaust gas temperature and boiler efficiency, and achieve flexible and convenient layout, improved Stable ignition and guaranteed performance
Active Publication Date: 2017-11-14
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Problems solved by technology
[0005] The low-temperature economizer does not belong to the category of boilers, and cannot reduce the exhaust gas temperature and improve the boiler efficiency. Although the low-temperature economizer further reduces the flue gas temperature, it belongs to waste heat utilization and saves low-quality low-pressure, low-temperature steam. Its working ability is limited. If the flue gas temperature is reduced from 115°C to 90°C, the temperature drop of 25°C can reduce the coal consumption by about 1.10g / kWh, which has little effect on improving the efficiency of the boiler.
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Embodiment 1
[0033] When arranging the preheater and economizer according to the first arrangement above, take a 1000MW ultra-supercritical coal-fired boiler as an example to illustrate the load as the rated load, as follows figure 1As shown, the 490°C high-temperature flue gas discharged from the tail flue of the boiler first flows through the high-temperature economizer 4, exchanges heat with the boiler feed water flowing through it, and leaves after the temperature drops to 426°C. Then it enters the high-temperature preheater 1, where it heats the secondary air. After the temperature drops to 395°C, it leaves and flows through the catalyst 6. The catalyst is a denitration catalyst that reduces most of the nitric oxide in the flue gas to nitrogen. Subsequently, the flue gas enters the medium-temperature economizer 5, where the boiler feed water is heated, and the temperature drops to 347°C before leaving. Then, the flue gas enters the medium temperature preheater 2. The medium temperatu...
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The invention discloses a boiler tail exhaust gas heat utilization system which comprises multiple stages of preheaters with the progressively-increasing and mixed temperatures and a coal economizer. The preheaters are communicated with the coal economizer through a flue. The boiler tail exhaust gas heat utilization system further comprises a secondary flue (13) penetrating through all the preheaters. Some heat of boiler tail exhaust gas is absorbed by the coal economizer, and the rest of the heat is totally used for heating primary air and secondary air entering a boiler, so that the boiler efficiency is improved by 0.5%-2%, and the coal consumption is lowered.
Description
technical field [0001] The invention relates to the technical field of boilers, in particular to a boiler tail flue gas heat utilization system. Background technique [0002] At present, exhaust smoke loss is the largest item among all heat losses of utility boilers. In the exhaust heat loss, the exhaust temperature is an important factor, and the high exhaust temperature leads to a large exhaust heat loss. Therefore, reducing exhaust gas temperature is an effective measure to reduce exhaust heat loss and improve boiler efficiency, thereby reducing coal consumption and pollutant emissions for power generation. [0003] The current power plant boilers mainly use rotary air preheaters to reduce the exhaust gas temperature and heat the air. Due to the limitations of volume, weight, layout requirements and low-temperature corrosion, the exhaust gas temperature generally drops to 120~130 °C, and the lowest can be reduced to 115 °C. ℃. On this basis, further increasing the heat...
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IPC IPC(8): F23L15/00
CPCY02E20/34
Inventor 刘泰生黎懋亮刘宇钢黄雪飞刘君易广宙
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP