Seeking help regarding heat exchangers and their condensate water utilization
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Hello, everyone: Our company is a compound fertilizer manufacturer, and we are currently planning to upgrade our equipment. We have encountered some issues and would like to seek your advice; any guidance you can provide would be greatly appreciated. We want to add equipment to achieve the following function: a) High-temperature, high-pressure steam is fed into the heat exchanger, and the temperature of this high-pressure steam is transferred to the air in the air ducts through the finned heat exchanger, thereby raising the temperature of the air to meet the process requirements, so that it can be used by the equipment. b) After heat exchange in the heat exchanger, the high-pressure condensed water is converted into low-pressure steam using associated equipment, which is then supplied for use in subsequent processes. Conditions are: 1. Heat exchanger: inlet steam pressure: 2.3Mpa～2.5Mpa ； Temperature: 240°C, 2. Secondary steam: Pressure: 1.2 Mpa ； Flow rate: 4000 KG/h. 3. Medium for raising temperature: ambient air ； Outlet temperature: 180～200℃ ； Flow rate: Q=40,000 M3/h. Here we have prepared a preliminary outline of the process. We would like to ask if this process can achieve the desired function; whether any additional equipment is needed. Is there anyone who knows how to implement this? Would it be possible to entrust the entire task to one company? Are there any recommended manufacturers? I’m in Shijiazhuang, Hebei. Thank you all.
A heat exchanger is essentially a heater; steel pipes and aluminum strips are the best choices, as it is feasible according to the principles involved.
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The steam at the drum outlet is calculated based on saturation temperature: 1.2 MPa at 188°C. In terms of the process, by reducing the pressure and temperature from 2.5 MPa and 240°C (enthalpy of 2852 kJ/kg) to 1.2 MPa and 188°C (enthalpy of 2783 kJ/kg), 4 tons of steam can only heat 1140 NM3 of air from 20°C to 200°C (the enthalpy of air at 20°C is 26.4 kJ/NM3) ； The enthalpy of air at 200°C is 266 kJ/NM3). In other words, to heat 40,000 NM3 of air, at least 140 tons of steam are required from the perspective of heat balance
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4 tons of steam, when converted into saturated water at 1.2 MPa, can heat 30,000 cubic meters of air; thanks to the latent heat of vaporization, the sensible heat involved is quite small. This transformation occurs when steam at 2.5 MPa is reduced to steam at 1.2 MPa.
What the questioner means is to use the latent heat and condensed water to flash vaporize secondary steam
What I mean is: high-pressure steam is used for heat exchange to raise the temperature of ambient air, and the cooled steam water resulting from this process becomes low-pressure steam, which can then be reused.
I don’t quite understand. On my end, high-pressure steam is used for heat exchange in order to raise the temperature of the air; the air with the increased temperature is then utilized at a certain process point ； The condensate water resulting from heat exchange with high-pressure steam is processed by the equipment to become low-pressure steam, which is then supplied for use in another process.
If the latent heat of steam is not utilized, a considerable amount of steam is required, as its sensible heat is relatively small.