Wednesday 19 February 2014 By: AP [1684]
Hello Folk. New on this forum and any help will be appreciated. I have a steam boiler NAT GAS 26,500lb / hr running at 150 psi. The boiler is used for a variable process load. My question is 1. At present, I use 90,000 liters of feedwater to create 52,000 kg of steam? Is this ratio of liters of water to steam produced? What should be an excellent ratio of feedwater to kg of steam generated? 2. I feel that the quality of the water that I feed my boiler is not ideal. Can anyone guide me on a technical sheet of the water characteristics required for an industrial boiler. The size and pressure of the boiler are given above. I’m in the dark here and I would appreciate a response from the gurus on this forum.
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Wednesday 19 February 2014 By: [email protected] [50]
Mr. AP: By putting your boiler data in SI units, this gives me a boiler steam output of 12,031 kg / hr, or about 12 tons / hr at 10.5 bar. Quite common to industrial steam boilers in many places. The figures you give for the outcome seem at first sight incompatible, more than four times the steam production if the 52,000 kg of steam you mention are produced per hour, and even more strange that you feed with 90,000 kg or 90 tons of water. It is true that more water is being fed than the steam produced, but the difference, I suppose, in about 2 to 5 percent more, will be mainly due to Boiler extractions required at the top and bottom which are required to extract the salt deposits from the bottom to keep under control the dissolved solids and foam which may be produced at the vapor separation surface to facilitate separation of the steam. Some boilers make this explosion continually, others intermittently. As the process is variable load, the figures I consider as average values. If the boiler had been modified, with larger burners, an increase in production could be expected, but I do not think a big difference. Even after a sudden drop in pressure, with the flashing steam increasing output, I doubt that much extra steam can be obtained and then for a short period of time. If the quality of the water you too The cause was the cause, there would be a huge amount of water permanently extracted, I can not imagine how this could be extracted through the valves Purge and pipes … In cylindrical boilers, smoke, as I imagine To you, water is kept alkaline, say PH about 8.5, with chemicals like Caustic soda, and sometimes additives are used to absorb oxygen. For this, you should consult the local experts. There are many commercially available products, but these 90 tons I can not explain. If the boiler data is correct, I would try to check the other digits, if that is correct, then I do not know what to say, I’m sorry.
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Thursday 20 February 2014 By: AP [1684]
Dear Claudio, I am very grateful for your answer. Let me clarify a little 1. 52,000 kg of steam are produced within a 24-hour period. A steam flow meter is attached to the boiler 2. 90,000 L of water has been taken from the boiler by the feed water in 24 hours 3. The Boiler is Danstoker 3 Pass Wet Back with an appropriately sized engraver Dunphy TG530 VML 4. Have a continuous blowing that is operational so need a manual brake once a day. I attached the log and reads to an Excel file Date 24Hr. Steam kg 24Hr Feed WaterM324 Hr 28/01/2014 52.653 91.2 29/01/2014 55 301 93.15 30/01/2014 57.264 94.84 31/01/2014 51 447 90.54 01/02/2014 54 790 90.78 03/02/2014 50.852 98.29 04/02/2014 68.160 112.43 [ br />
| Blow Down Log.pdf | EMS totalizer.pdf |
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Wednesday 19 February 2014 By: Glencannon [28]
First, convert all system components to the same units. Typically, the flow rate of steam and water in a boiler system is measured in Kg per hour. This is done because the volume of the vapor depends on the temperature and pressure and the volume of the water is not. Once you no longer attempt to calculate with two different units, the feed water flow plus the stirrer flow, if you have an air conditioner, should balance the steam flow plus the continuous purge flow. If you do not have an air conditioner, the supply water flow should be balanced for the steam flow plus the continuous purge flow. It is possible that you have further losses due to the leakage of the pump and valve glands and valves that are passing but this is basically the ratio you should see
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Thursday, February 20, 2014 By: Jim Watts [764]
Your numbers do not feel good, but what’s wrong is the question. The water fed to a boiler must come out somewhere and in your case either steam or purge. As your boiler seems to be new, there could be all sorts of possibilities to get funny numbers. Your purge control seems to be good with regard to TDS. The possibilities I see are. 1 All counters are correct and you just use a lot of water. This would happen if you had very high TDS feedwater from your supplier or you were putting too much chemicals into the boiler and you had to blow them up. This will also appear as a high fuel consumption. 2 Either the water meter or the water meter is incorrect. The water meter is probably a turbine and very unlikely to be mistaken. The steam meter relies on a density correction somewhere and this can easily be mistaken. I would look here first.
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Thursday 20 February 2014 By: AP [1684]
Dear Jim, Thank you for your reply. As you can see, I’m a novice here … solving / saving money. Please find attached my characteristics of the water supply to the boiler after running water through the softening installation. Attached file pdf. Give me your opinion on the quality of the water supply. You mention TDS or high-dose chemicals. Could you let me know what you consider a very high TDS for feedwater? You have noticed your comments on the meter check. I will do it. Just FYI, we have a Mag flow meter for water and a Vortex Prowirl 72FNF for steam
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Thursday 20 February 2014 By: [email protected] [50]
Hullo AP … Some brief information. In my country, water is considered under excellent conditions, or soft, if with less than 2 ppm of CaCO3, and lasts if more than 7 ppm, according to certain information obtained. I am not an operator, so the accepted value can be another in practice. In the Miltons book on marine steam boilers, a pH value of 10.5 to 11 is recommended for high pressure boilers and above 9 in auxiliary boilers, so the value with which you are working is very good . As you say your intention is to save money and you have a continuous purge, even if you have not indicated how much, from 10.5 bar to almost atmospheric pressure , You could get a clean steam of 12 or 13% at about 102 C if you had a flashtank installed and the purges broke out there. Maybe you already have it, but if you do not, it’s worth investigating the possibility. There may be little steam in kg / h, but it can be used to heat, and it is free of charge, after the cost of the tank is offset.
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Thursday, February 20, 2014 By: Jim Watts [764]
Your feed water is gentle OK. The TDS depends on your location and is not unreasonable for a low pressure boiler. The boiler should extinguish about 17 to 20 percent to keep the boiler water within the limits. You blow at least twice that rate even if the water meter represented the flow of steam. I would not be surprised if the water and steam flowmeters are incorrect. Both meters are high-tech and, although they are very accurate and reliable, they both require careful commissioning to set them correctly. You can check your feed flow easily if you have a tank, for example, a softened water tank, you can isolate the inlet and disconnect the level for 4 hours and Measure the tank loss compared to your Feedwater flow integraater. The steam flowmeter must be checked, it is with the arrow on the side indicating the direction of flow and the density figure given to the manufacturer is correct. It would be interesting to let us know how this is solved whenever it is.
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Friday 21 February 2014 By: AP [1684]
The counters will be checked to see their accuracy. In addition,
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Saturday 22 February 2014 By: Sergio Adofaci [1497]
Claudio and Jim have given you very good suggestions, but considering that you use almost twice as much feed water and then steam out, the other consideration is that you have a blow valve Seriously leaked
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Saturday 22 February 2014 By: Jim Watts [764]
Hello Sergio, It would be a consideration normally, but in this case the boiler water gains in TDS every 4 hours newspaper and it would fall if a leak was present.
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Tuesday 25 February 2014 By: ruel [1247]
Do not refresh the possibility, you may want to check the location of your flow meter for feedwater. If your configuration is running the pump, your meter could read the excess back to your supply tank.
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