排烟热损失是热风炉各项热损失中最大成都收账一项，一般约为5%~12%，占热风炉热损失成都找人公司60%~70%。影响排烟热损失成都收账主要因素是排烟温度，一般情况下，排烟温度每增加10 ℃，排烟热损失增加0.6% ~I .0%，相应多耗煤1.2% ~2.4%。若以燃用热值为20000 kJ/kg煤收账410 t/h高压热风炉为例，则每年多消耗近万吨动力用煤。我国许多电站热风炉 成都找人公司排烟温度高于设计值，约比设计值高20~50℃。所以，降低排烟温度对于节约燃料、降低污染具有重要的实际意义。
The heat loss of exhaust gas is the largest one among all the heat losses of hot blast stoves, generally about 5%~12%, accounting for 60%~70% of the heat loss of hot blast stoves. The main factor affecting the heat loss of flue gas is the temperature of flue gas. Generally, the heat loss of flue gas increases by 0.6%~I.0% with the increase of 10 C, and the corresponding excessive coal consumption is 1.2%~2.4%. If the 410 t/h high pressure hot blast stove burning 20 000 kJ/kg coal is taken as an example, nearly 10,000 tons of power coal will be consumed every year. The exhaust gas temperature of many power plants in China is higher than the design value, which is about 20~50 degrees higher than the design value. Therefore, reducing the exhaust gas temperature is of great practical significance for saving fuel and reducing pollution. 以降低排烟温度为目的的热风炉技术改造的方案较多。考虑到大多数电厂热风炉尾部烟道空间太小，防磨、防腐蚀要求较高，引风机的压头裕量不大等实际情况，我们采用利用低压给水回收热风炉排烟余热的低压省煤器方案，受热面形式则采用螺旋肋片复合扩展表面蛇形管，并且采用镍铬渗层零隙阻换热管，以便达到在有限空间内最大限度降低排烟温度并保证可靠运行的目的。采用该方案，入炉热风温度不受任何影响，且排烟温度可以根据季节和煤质进行调节。
There are more technical transformation schemes for hot blast stoves to reduce exhaust gas temperature. Considering the fact that the tail flue space of hot blast stove in most power plants is too small, the requirements of anti-wear and anti-corrosion are high, and the pressure head margin of induced draft fan is not large, we adopt the low-pressure economizer scheme to recover the waste heat from hot blast stove exhaust by using low-pressure feed water, and the spiral fin compound expansion surface snake-shaped tube is adopted in the form of heating surface. The zero-gap resistance heat exchanger tube with nickel-chromized layer is used to minimize the exhaust gas temperature in a limited space and ensure reliable operation. With this scheme, the hot air temperature is not affected, and the exhaust gas temperature can be adjusted according to season and coal quality.
Low-pressure economizer and extended surface heat transfer enhancement technology are mature technologies of Shandong University and Jinan Daneng Power Technology Co., Ltd. for retrofitting the tail heating surface of hot blast stove. They have been successfully applied to energy-saving retrofitting of hot blast stoves in many domestic power plants and have developed to the stage of optimizing the structure system in theory. In Shandong Province, Longkou Power Plant put into operation two low-pressure economizers (with two 100 MW units) in June 1997. It has been operating for more than eight years, and has achieved remarkable benefits by lowering the exhaust temperature (165-135) by 30 C (and the exhaust temperature can be adjusted). In 2003, low pressure economizer was used to reduce the exhaust gas temperature by 45 C and coal consumption by 4.95g/kwh in # 5 and # 6 boilers of 200 MW units in Longkou Power Plant. The low-pressure economizer with spiral finned tubes (equipped with 125MW) was put into operation in #2 hot blast stove of Weihai Power Plant in October 2003. The exhaust gas temperature (167-142) was reduced by 30 C, and the coal consumption of power generation was reduced by 3.36 g/kwh. Low-pressure economizer was designed and installed in #1 hot blast stove of Weihai Power Plant in March 2006. Low-pressure economizer was installed in #1 and #2 boilers of 137MW unit of Jining Canal Power Plant in 2006. After putting into operation, the exhaust gas temperature (163-138) was lowered by 25 degrees, and good results were achieved. For 200 MW units in Shanxi Shentou No. 1 Power Plant, # 3 and # 4 boilers are equipped with low-pressure economizers to reduce the exhaust gas temperature (176-156) by 20 C, thus achieving good energy-saving and environmental protection benefits. The low pressure economizer is used in the #3 and #4 boilers of 200 MW units in Guizhou Guizhou Guizhou Power Plant to reduce the flue gas temperature (176-156) of the hot blast stove by 25 degrees, and good economic benefits are obtained. Now Shanxi Shentou No.1 Power Plant, Guizhou Guizhou Guizhou Power Plant, Guizhou Guizhou Guizhou Guizhou Power Plant, Shandong Baiyanghe 137MW unit (circulating fluidized bed), Huaneng Haikou Power Plant 125 MW hot blast stove unit low pressure economizer project is in progress, Liaoning Qinghe Power Plant 200 MW unit and Shanxi Gujiao Power Plant 300 MW unit are also prepared to use low pressure province. The utility model reduces the exhaust gas temperature and realizes the purpose of reducing coal consumption and desulfurization project requirements.
On the basis of thermodynamic calculation and techno-economic comparison, the following feasible conclusions are drawn according to the operation of power plants with low-pressure economizer installed.
1) the space of the tail flue of hot blast stove can be arranged to arrange all the low pressure economizer heating surfaces.
2) the thermodynamic system and parameters of the steam turbine are suitable for the transformation of the low pressure economizer.
3) the equipment investment is saved, the recovery period is very short, and the technology is economical and feasible.
4) extend the surface manufacturing process and quality.
In summary, the modification of hot blast stove with low pressure economizer to reduce the exhaust gas temperature is not only necessary and urgent, but also feasible.
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