1 / 9

Process Heating

Process Heating. Corrugator Condensate Refeeding . www.caliqua-bormann.de. Content. Heating Systems. Introducing to Calculation of Heat Recovery. Calculation of Heat Recovery. Scheme. Scheme Description. World Map. End. Open and Closed Steam System.

elsu
Télécharger la présentation

Process Heating

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Process Heating Corrugator Condensate Refeeding www.caliqua-bormann.de

  2. Content Heating Systems Introducing to Calculation of Heat Recovery Calculation of Heat Recovery Scheme Scheme Description World Map End

  3. Open and Closed Steam System

  4. Introducing to Calculation of Heat Recovery Our following calculation of heat recovery is based on a corrugator plant with 2 single facers, 1 triple heater and 1 double facer with 20 heat plates. This configuration has a steam consumption of about 5.000 kg/h.Two basicially different steam- and condensate systems namely an open and a closed are compared in this calculation. The open system is the traditional system. It has two big advantages : ● its low purchase costs and ● its high differential pressure between steam- and condensate side, which is ideal for a good draining of the machines. The condensate is coming out of the machines and is collected into a pressureless tank which is open to the atmosphere (see schematic please). The total high pressure condensate of the plant evaporates into the atmosphere.The result are extreme losses of energy and soft water. This big disadvantage of the open system is no alternative to an closed system in view of increasing energy costs in the future. The following economic efficiency calculation will approve this. Please take some time it’s worth it. Enclose some explanations to the calculation : A. 4500 kg/h high pressure condensate evaporates from 10 barg (184 °C ) to 0 barg (atmospheric pressure) into pressureless tank. According the re-evaporation diagram (see background) you lost 16 % evaporation steam it means 720 kg/h. B. 1220 Kg/h fresh water (500 kg/h steam shower losses + 720 kg/h evaporation losses) must be heaten up from 10° C until 103 °C (deaeroation temperature in the feed water tank). The steam boiler must produce 244 kg/h steam in order to heaten up 1220 kg/h fresh water in the open system. C. In the closed system however the boiler must heaten up only 100 Kg/h Fresh water for steam shower losses. D. As the condensate is feed back directly to the boiler with an higher condensate temperature (176° C) compared with the open system (103°C ) a reduced heat quantity is necessary. E. The investment costs include a high pressure condensate unit with tank and pump, closed feed water tank, switch cabinet and installation costs. As you can see within less more than 1 year the investment will be amortized.Please consider the calculation was made for a two shift operation. The payback period for a three shift operation will be shorter. If you make your own calculation you should take your local costs for energy and water in column F.

  5. 4500 kg/h evaporates from 10barg to 0bar(Atmosphere) ≙ 16% re-ev ≙720 kg/h Fresh Water HEATING: (720+500) kg/h FW (10°C → 103°C) Mass of steam per hour Blending temperature Energy difference per hour Mass of oil saving per hour Specific heat capacity 4,18 KJ/Kg K Net calorific value 42820 KJ/Kg Density of light oil 0,82 Kg/L Boiler efficiency 90 % Gain by steam saving Gain by fresh water saving Gain by fuel saving Calculation of Heat Recovery Basis data: Steam boilerload: 5.000 kg/h Condensate back to boiler 90%: 4.500 kg/h at 10barg and 184°C Working Pressure: 14 barg Fresh water feeding 10%: 500 kg/h (replacement for steam Running hours: 16 h/d at 220 d/Y shower, leaks etc.) re-evaporation % OPEN SYSTEM CLOSED SYSTEM HEATING: 500 kg/h (10°C → 103°C) A C Blending (condensate) 4500 kg/h of 184°C with (feed water ) 500 kg/h of 103°C B D F Complete Gain E Investment

  6. Scheme

  7. Scheme Description Some explanations to the function of our system (see schematic please) G. Independed pressure (temperature) control unit for a single facer For a low grammage paper production it is necessary to adapt the temperatures of a single machine (for example e-flute). Low grammage paper or preprint require low temperatures in order to prevent overheating of the paper. For that reason we have developed these control unit G. You can control down until 7 barg and you can exactly adjust the temprature for your used paper quality. H. Independed pressure (temperature) control unit for double facer. With the double facer control units H all sections can be controlled down indendently until 1 barg (120 ° C). Conventional power traps have about the 5 – 6 fold on operating cycles by reasons of its small storage space. K. The high pressure condensate pump is frequency controlled and for that reason only a small high pressure condensate tank is necessary. L. Prepressure control in order to protect the condensate pump from cavitation. I. Start-up automatic in order to defend the boiler from heat tensions and overfilling in the start-up period.

  8. Worldwide Installations List of Reference For please contact CALIQUA-BORMANN office

  9. Thank you for your attention For further information please contact our office CALIQUA-BORMANN GmbH & Co. KG Wärme- und Klimatechnik Frankfurter Ring 222 80807 München Germany eMail: info@caliqua-bormann.de

More Related