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余热发电系统怎么设计才能实现最大化

来源:http://www.huannengpower.com   发布于:2018-04-16

一、过热蒸汽产量最大化。对于中低温余热利用,关键在于工艺和设备允许范围内充分利用余热,并使设备的效率最高,使余热发电最大化;对于低参数汽轮发电机组而言,影响其发电量的是三个主要参数:过热蒸汽流量、压力和温度,其中流量对发电量起决定性影响,压力和温度对单位质量蒸汽的焓和汽轮机的内效率(热能转化为机械能的效率)有影响,但其影响远小于流量的影响。一般来讲,窑尾废气余热占可利用余热的60%以上,所以在考虑整个生产线的过热蒸汽流量时,首先考虑使窑尾的过热蒸汽产量最大,窑头配合窑尾。

First, the production of superheated steam is maximized. For the use of medium and low temperature waste heat, the key is to make full use of waste heat within the permitted range of technology and equipment, and make the highest efficiency of the equipment and maximize the power generation of waste heat. For low parameter turbo generator, three main parameters, superheated steam flow, pressure and temperature, are affected by the low parameter steam turbine generator set, of which the flow is generated to power generation. The influence of the pressure and temperature on the enthalpy of unit mass steam and the internal efficiency of the steam turbine (heat energy conversion to mechanical energy) is influenced by the pressure and temperature, but the effect is far less than the effect of the flow. Generally speaking, the waste heat of the tail gas of the kiln accounts for more than 60% of the available waste heat, so in consideration of the superheated steam flow in the whole production line, the maximum output of the superheated steam in the tail of the kiln is considered first, and the kiln head is matched with the kiln tail.

二、高过热蒸汽温度。过热蒸汽温度高除可以通过提高过热蒸汽焓值和汽轮机内效率来提高发电量外,但要提高汽轮机运行的安全性。受传热效率和锅炉制造成本的影响,必须保持过热蒸汽同烟气之间有适当的温差,该温差在20℃以上比较合理。

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Two. The temperature of high superheated steam. Besides the superheated steam temperature, we can increase the generation volume by increasing the enthalpy of superheated steam and the efficiency of turbine, but we need to improve the safety of steam turbine operation. Due to the influence of heat transfer efficiency and boiler manufacturing cost, it is necessary to maintain an appropriate temperature difference between superheated steam and flue gas, and the temperature difference above 20 C is reasonable.

三、合适的汽包工作压力。考虑在换热过程中,蒸发受热面内汽水混合物的温度不变,而烟气同汽水混合物之间传热温差窄点在20℃以上受热面的布置才合理,汽水混合物的温度直接受压力的影响,所以选择合理的压力水平为受热面布置创造条件,以防止锅炉造价过高。

Three, the appropriate pressure of the drum work. In the process of heat transfer, the temperature of the steam water mixture in the evaporation heating surface is constant, and the heat transfer temperature difference between the flue gas and the vaporized water mixture is reasonable. The temperature of the steam water mixture is directly affected by the pressure, so the reasonable pressure water level is chosen to create conditions for the heating surface, so as to prevent the heating surface. The cost of the boiler is too high.

四、充分降低废气温度。受窑尾废气要用于烘干生料的工艺限制,一般窑尾废气温度只能降至225℃左右;窑头余风可以充分降低,但降低过多则造成传热温差小使得换热面积布置过多,使锅炉造价提高,同时吸收过多的低品质热量也无法有效提高发电量,所以窑头余风的降低以满足为窑头和窑尾余热锅炉提供足量的汽包给水即可。根据热量分配和能量平衡计算,窑头余风降至96~98℃即可满足要求。

Four, fully reduce the exhaust gas temperature. When the kiln tail gas is used to dry the raw material, the temperature of the tail gas of the kiln can only be reduced to about 225 degrees centigrade, and the residual wind of the kiln head can be reduced fully, but the excessive reduction of the heat transfer temperature makes the heat transfer area too much of the heat transfer area, which makes the cost of the boiler increase and the excessive absorption of low quality heat can not effectively improve the power generation. The amount, so it reduces the kiln head to meet for the kiln head and tail waste heat boiler drum water can provide adequate. According to the calculation of heat distribution and energy balance, kiln head it to 96~98 degrees to meet the requirements.

五、合理布置受热面。在布置受热面时要考虑窑尾、窑头的烟气温度特性以及汽轮发电机的特性进行综合考虑,同时考虑选用合理温差以降低锅炉造

Five. Arrange the heating surface reasonably. The characteristics of the flue gas temperature of the kiln tail and the kiln head should be considered in the layout of the heating surface, and the reasonable temperature difference should be considered to reduce the production of the boiler.

有了焦化发电机组上面的小总结,希望对广大客户有所帮助,如果有什么不理解的或者寻求帮助的请点击我们的官方网站:http://www.huannengpower.com 者来电咨询,我们会尽全力为您解决

There is a small summary of the coking unit, hoping to help the customers. If there is anything that is not understood or ask for help, please click on our official website: http://www.huannengpower.com caller calls, we will do our best to solve the problem.


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