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reheater
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  reheater
Fireside corrosion tests have been conducted under conditions simulating those of waterwalls and superheater/reheater tubes.
      
Advanced austenitic stainless steels for use as super and reheater tubing are available for service temperatures up to 650 °C (1112 °F) and possibly 700 °C (1292 °F).
      
Problems caused by hot corrosion and creep damage on superheater and reheater tubes of power plants using heavy oil as fuel inhibit the continuous service of the boilers and shorten their design lives.
      
This type of coating is normally used as protection against heat, corrosion and erosion actions encountered in superheater and reheater tubes in power plant boilers.
      
Particular attention is given to the substantial service experience of using some 250 km of co-extruded tubes, for furnace walls and superheater/reheater replacements in large pulverized coal fired boilers in the UK.
      
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The method of turbine regulation has to be considered in the design of steam boiler reheater.From the point of economy,it may not be necessory to control the reheat steam temperature,but for the sake of sabety,it has to be controlled within limits. The variation of reheat steam temperature,at different boiler load,is con- cerned with the percentage of direct radiating heat,absorbed by the reheater from the furnace. The reheat steam temperature changes sensibly by the voriation of flame position in...

The method of turbine regulation has to be considered in the design of steam boiler reheater.From the point of economy,it may not be necessory to control the reheat steam temperature,but for the sake of sabety,it has to be controlled within limits. The variation of reheat steam temperature,at different boiler load,is con- cerned with the percentage of direct radiating heat,absorbed by the reheater from the furnace. The reheat steam temperature changes sensibly by the voriation of flame position in furnce,so it is good for conditional regulation.Gas recirculation is the most popular method for reheat control,the omount of recirculing gas is concerned with the location of the reheater in the gas passages.However,the flue gas heat loss of the boiler set will be increased when the gas recirculation is opplied.For reheat control,the method of steam by-pass will not affect the high pressure steam temperature,but the omount of high alloy steel for the ma- nufacture of reheater is much more increased.When using gas damper for regu- lation,if a part of the primary superheater heating surface is placed in poralld with the reheater,the reheat control will increase the difficulty for the control of primary steam temperature. In practice,each control method requires certain feasible condition for its opplication ond also has limit of temperature controlling range.

中间过热器的设计与汽轮机的调节方法有关。从经济方面看来,对二次汽温不一定要进行调节;但从工作安全方面来看,这种调节是必要的。在不同负荷下,二次汽温的变化同中间过热吸收炉膛辐射热的百分量有关。用喷燃器倾角调节时,二次汽温的变动最灵敏,因而适于作动态调节。烟气再循环是最常用的调节方法,所需再循环烟量同中间过热器所处的烟温地带有关。烟气再循环会增大锅炉机组的排烟热损失。蒸汽旁路的调节方法不影响一次汽温,但中间过热器所需金属用量增多。当用烟气挡板调节时,如一次和二次过热器并例工作,则二次汽温的调节将增大一次汽温调节的困难。实际上每种调节方法均有一定的适用条件和调节幅度的限制。

Through calculation of concrete boiler design, the paper discusses: the influences of gas recirculation to the heat transfer of different heating surfaces; the suitable arrangement of steam reheater; the amount of recirculating gas needed for controlling the reheat temperature; and the influence of gas recirculation to the economy of boiler plant. The paper also gives a brief review of the peculiarities of different reheat temperature controlling methods.

本文通过了具体鍋爐机组的热力計算与分析,說明烟气再循环对各个受热面传热的影响,中間过热器的合理布置,为維持二次汽溫所必需的再循环烟量,以及烟气再循环对鍋爐經济性的影响,还簡要論述二次汽溫各种調节方式的一些基本特点。

The object of this contribution is to ascertain the feasibility of a single furnace design for the 300 MW UP once through boiler to be made in this country. Special attention is given here to the application of the following components, such as the radiant reheater, spray desuperheating for reheat control, integral separator start-up system and two stage series-connected HP and LP bypass systems.

本文对国产30万千瓦UP型直流锅炉由双炉膛改为单炉膛布置进行了研究,特别分析了采用辐射再热器、喷水调节再热汽温、内置式启动分离器系统和两级串联的汽机旁路系统等问题。

 
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