Steam heating technology modification
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A few days ago, I saw that molecular sieve regeneration steam heating consumes less energy than electric heating. Our workshop has always used electric heating and just happened to have a steam pipe laid in our workshop. I want to make some technical improvements. The investment in technical improvements should not be large. I have never seen what the steam heating process is like. Should I add a steam heating furnace? What should I pay attention to in operation? I hope the experts in the forum can help me calculate whether the technical modification is cost-effective. Here are some parameters to tell you that the steam coming here is medium pressure steam, the temperature is 245℃, the price is 150 yuan/ton, and the pressure is 1.0MPa. There are 2 sets of air separation equipment. The heating furnace power is 48 and 60kw (small air separation). The amount of waste nitrogen used for regeneration is 800m3/h and 1100m3/h. What other parameters are needed? I will provide them immediately. I hope you can help me. I will be very grateful.
Also check the nitrogen outlet temperature. Temperature and flow rate determine the size of your heat exchanger. The price of 150 kilograms of superheated steam per ton is not low! Is the pressure wrong? Is it 25kg?
The outlet temperature of pollutant nitrogen is about 7 or 8 degrees in winter and 10-13 degrees in summer. The price of the steam from our own factory is the selling pressure. I have seen 1.2MPa.
In fact, it doesn't matter. If you have enough data, find a heat exchanger company. When the time comes, they will provide you with a table of heat exchanger medium flow, pressure and temperature. You can just fill it out. Contact a few manufacturers first. It is estimated that there is no need for public bidding. Just compare the prices and it will be done.
I would like to ask whether this kind of technical transformation is cost-effective, otherwise it is not as cost-effective as an electric heating furnace. It is not as good as not. Mainly, I want to ask how much medium-pressure steam I need when regenerating my two purifiers. Can anyone help me calculate it? You can tell me what the temperature of the heat exchange steam inlet and outlet is in a general steam heating process. I can also assume that it is mainly because I have never seen this process of steam heating.
I'm lazy! ! ! ! ! Just change it! ! ! ! ! ! ! The energy consumption of steam is equal to the power of your electric stove. You can do the math yourself and see how many tons of steam are used. However, one thing to note is your heat exchanger choice, whether to choose a double-tube sheet steam heater or ordinary heating gas. The difference lies in whether your drainage temperature is higher or lower and whether it is more energy-saving. I guess steam is still cheaper, but I don't know the price of the heat exchanger.
For this question, you should first consider the value of your steam and compare it with the value of electricity. If steam uses waste heat and cannot be used for other purposes, you can consider technical modification. If the values are equal, it would be better to use electric heating. If there is excess steam, technical modifications can be considered. In practical applications, mixed use can be considered, which is more economical.
1.2MPa steam can generally only be used as waste heat (the steam pressure for power generation must be above 3.5MPa). From the perspective of energy saving throughout your company, it should be possible, and the temperature is sufficient, but for your department, it may not be cost-effective to charge 150 yuan/ton. Steam heaters are more troublesome. Generally, double-tube plate heat exchangers are used to prevent leakage. Moreover, there is still a risk of leakage. Once leakage occurs, water will enter the molecular sieve and the heat exchanger will be destroyed. * * Tired of it. We had a double tube sheet steam heater and it leaked after 6 years. Your electric heater is 108KW. Calculated based on 100 minutes of heating every 4 hours, the electric heater uses 380,000 KW for heating throughout the year, which is about 200,000 RMB. The cost of converting 2 sets of equipment to steam heaters is estimated to be 60,000 to 70,000 yuan, and the steam cost is more than 200,000 yuan per year.
The electricity bill here in Zhejiang is relatively expensive. According to the parameters given to me by others, we estimate that it is only 0.25t/h. I roughly calculated that we switch every 6 hours and heat for 10,000 seconds at a time. In a year, it will be 1014t, which is about 15W! Our electric heating needs 27W a year... I think it can be done. Thank you for your suggestions.
I don’t know what your electricity price is. The average here is about 1 yuan/kWh. If steam costs 150 yuan/ton, it is of course more cost-effective to use steam for the same heat supply. The key is the investment in heat exchangers.