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.
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.
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.
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.
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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