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- 蒸汽加热消白系统 Flue gas water cooling - steam heating whitening system

一般在 4 5 - 56 ,排放到大气中时,会预冷而凝结,产生有色烟羽,极大影响了视觉环境,因此要求烟气加热,以便消除白色烟羽。 The flue gas after wet desulfurization is a saturated wet flue gas , generally at 4 5-56 . When discharged to the atmosphere, it will be pre-cooled and condensed to produce colored plumes, which greatly affects the visual environment. Therefore, the flue gas is required to be heated To eliminate white plumes. ,所携带的水量也会增加很多 . Since the temperature of the flue gas has a great influence on the moisture content, even if the temperature of the wet flue gas is increased by 1 ° C , the amount of water carried will also increase a lot .

30 ℃, 湿烟气的温度通常不低于 5 0 ℃,要消除烟羽,必然要加热到更高温度,消耗更多热能。 If the flue gas temperature is 1 30 ℃, the temperature of the wet flue gas is usually not lower than 50 ℃. To eliminate the plume, it is necessary to heat to a higher temperature and consume more thermal energy. 5 ℃,则湿烟气温度通常为4 5 - 46 ℃, 可以减少 3%的水蒸汽蒸发,节约脱硫用水,消白的加热温度可以降低1 0 左右 因此也节约大量加热蒸汽 If the temperature of the flue gas before desulfurization can be reduced to 95 ° C, the temperature of the wet flue gas is usually 4 5-46 ° C, which can reduce 3% of water vapor evaporation, save water for desulfurization, and reduce the heating temperature for whitening. , so a lot of heating steam is also saved .

如果用除盐水将脱硫前的烟气温度降低 3 5 ℃, 则利用的余热可以将饱和湿烟气提高 3 5 ℃。 Calculations show that if the temperature of the flue gas before desulfurization is reduced by 35 ° C with demineralized water , the use of waste heat can increase the saturated wet flue gas by 35 ° C. GGH相同的经济性 但设备要小得多 The amount of steam saved in the deaerator is equal to the amount of steam consumed by the heating of the flue gas. Therefore, the entire system can consume no additional steam and has the same economy as M GGH , but the equipment is much smaller .

S S2205 P TFE N D The material of the heat exchanger can be S S2205 , P TFE , N D steel .

S S2205 P TFE 材质的换热器 布置在电除尘器后端的喇叭接口内 只需要增加一段 1 米长的烟气冷却器。 Flue gas cooler : A heat exchanger made of S S2205 or P TFE is arranged in the speaker interface at the rear of the electric precipitator , and only a 1- meter long flue gas cooler needs to be added .

S S2205 N D 钢材质的翅片管换热器 布置在水平湿式电除尘器后端的喇叭接口内 只需要增加一段 1 米长的烟气加热器。 Flue gas heater : A finned tube heat exchanger made of S S2205 or ND steel is arranged in the horn interface at the rear of the horizontal wet electrostatic precipitator , and only a 1- meter length of flue gas heater needs to be added . If the wet electrostatic precipitator is installed vertically, the flue gas heater can be arranged below the chimney.

  2 20t/h 锅炉烟气冷却 - 蒸汽加热消白设计参数 Typical 2 20t / h boiler flue gas cooling - steam heating whitening design parameters :

 

project

unit

Flue gas cooler

Flue gas heater

Flue gas inlet and outlet temperature

30--95 1 30--95

5--80 4 5--80

Flue gas flow

m3/h N m3 / h

0.5 3 0.5

0.7 3 0.7

Media type

 

Demineralized water

steam

Media parameters

 

0 2 0

.8MPa250 0 .8MPa250

Media flow

/h t / h

20 Water 2 20

Steam 7

Heat transfer

W K W

4150

150 4 150

Heat exchange element

 

S2205 翅片管 S S2205 finned tube

S2205 N D 钢翅片管 S S2205 or N D steel finned tube

Heat exchange area

M2

380 1 380

160 1 160

equipment weight

t

1 2 1

19

Module smoke resistance

Pa

180

160

Save steam

/h t / h

.2 5 .2

.8 1 .8

System steam consumption

/h t / h

0

 

GGH 其设备大小和烟气阻力将是本系统的 2 .5 -- 3 If M GGH is used , its equipment size and smoke resistance will be 2.5-3 times that of this system .

  In addition to salt water cooling -steam heating, the most economical method of smoke whitening without additional steam consumption!

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