D88尊龙

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余熱發電系統怎么設計才能實現大化

來源:http://dgxcbw.comD88尊龙   發布于:2018-04-16

D88尊龙一、過熱蒸汽產量大化。對于中低溫余熱利用,關鍵在于工藝和設備允許范圍內充分利用余熱,并使設備的效率高,使余熱發電大化;對于低參數汽輪發電機組而言,影響其發電量的是三個主要參數:過熱蒸汽流量、壓力和溫度,其中流量對發電量起決定性影響,壓力和溫度對單位質量蒸汽的焓和汽輪機的內效率(熱能轉化為機械能的效率)有影響,但其影響遠小于流量的影響。一般來講,窯尾廢氣余熱占可利用余熱的60%以上,所以在考慮整個生產線的過熱蒸汽流量時,首先考慮使窯尾的過熱蒸汽產量大,窯頭配合窯尾。

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.

D88尊龙二、高過熱蒸汽溫度。過熱蒸汽溫度高除可以通過提高過熱蒸汽焓值和汽輪機內效率來提高發電量外,但要提高汽輪機運行的安全性。受傳熱效率和鍋爐制造成本的影響,必須保持過熱蒸汽同煙氣之間有適當的溫差,該溫差在20℃以上比較合理。

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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、合適的汽包工作壓力。考慮在換熱過程中,蒸發受熱面內汽水混合物的溫度不變,而煙氣同汽水混合物之間傳熱溫差窄點在20℃以上受熱面的布置才合理,汽水混合物的溫度直接受壓力的影響,所以選擇合理的壓力水平為受熱面布置創造條件,以防止鍋爐造價過高。

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、充分降低廢氣溫度。受窯尾廢氣要用于烘干生料的工藝限制,一般窯尾廢氣溫度只能降至225℃左右;窯頭余風可以充分降低,但降低過多則造成傳熱溫差小使得換熱面積布置過多,使鍋爐造價提高,同時吸收過多的低品質熱量也無法有效提高發電量,所以窯頭余風的降低以滿足為窯頭和窯尾余熱鍋爐提供足量的汽包給水即可。根據熱量分配和能量平衡計算,窯頭余風降至96~98℃即可滿足要求。

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.

D88尊龙五、合理布置受熱面。在布置受熱面時要考慮窯尾、窯頭的煙氣溫度特性以及汽輪發電機的特性進行綜合考慮,同時考慮選用合理溫差以降低鍋爐造

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.

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