EP1647768A1 - Système fermé pour la récupération de condensat et procédé fermé pour la récupération de condensat - Google Patents

Système fermé pour la récupération de condensat et procédé fermé pour la récupération de condensat Download PDF

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Publication number
EP1647768A1
EP1647768A1 EP05013516A EP05013516A EP1647768A1 EP 1647768 A1 EP1647768 A1 EP 1647768A1 EP 05013516 A EP05013516 A EP 05013516A EP 05013516 A EP05013516 A EP 05013516A EP 1647768 A1 EP1647768 A1 EP 1647768A1
Authority
EP
European Patent Office
Prior art keywords
condensate
sump
water
temperature
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP05013516A
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German (de)
English (en)
Inventor
Tilfried Rössler (Dipl.-Ing. FH)
Otmar Ulrich Dipl.-Ing. Schäfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caliqua-Bormann & Co KG GmbH
Original Assignee
Caliqua-Bormann & Co KG GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caliqua-Bormann & Co KG GmbH filed Critical Caliqua-Bormann & Co KG GmbH
Publication of EP1647768A1 publication Critical patent/EP1647768A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler

Definitions

  • the invention relates to a closed system for condensate recovery and a closed process for condensate recovery for systems that are operated with the heat transfer steam.
  • the condensate can be recycled economically into the steam generator or a high-pressure vessel.
  • Such steam and condensate systems are used in particular in systems in which several consumers are operated at the same or different pressures, on the one hand to cover the heat demand of consumers and on the other hand to allow economic operation by the condensate without process-related quantity and energy loss of the steam generating plant Reuse is supplied.
  • the recycling applies on the one hand to the water or working fluid per se and on the other hand, the heat energy not taken by the consumers, which does not have to be generated again.
  • systems with relatively many small consumers such.
  • closed condensate systems To compensate for this heat loss at least partially, so-called closed condensate systems have been developed.
  • a stepwise pressure release of the condensate is usually carried out with a flash vapor recovery.
  • the pressure stages are chosen so that the condensates of pressure-controlled consumers can relax into a steam network of correspondingly lower pressure.
  • the condensate is conducted into a pressure release device associated with the corresponding steam pressure.
  • the higher vapor pressure expander also has a connection to depressurizers of lower vapor pressures, so that the high pressure condensate is gradually depressurized.
  • the direct supply of high-pressure condensate to a plurality of expander it can be supplied to the relaxation to a certain pressure further low-pressure consumers. If the amount of flash vapor obtained from the high-pressure condensate is insufficient, the pressure in the low-pressure expansion steam network is optionally kept constant by supplying live steam. The condensate remaining in the low-pressure stage is pumped back into the feedwater tank via the degasser.
  • the invention is based on the idea to collect the condensate from the respective consumers in an associated collecting container, which has an inflow from a drive water tank.
  • motive water this is, for example, water from the feed water vessel of the boiler plant
  • a preferably coupled with the supply of motive water or the return of motive water to the motive water tank and the discharge of condensate from the collection valve or a corresponding device on Kondensatzulauf between consumers and sump, so that during the condensate discharge from the sump no condensate drain in the collecting container takes place.
  • a condensate feed from the consumer takes place in the associated collecting container. If a certain amount of condensate is reached in the sump, the outflow of condensate from the consumer is prevented in the sump. At the same time by a supply of propellant water in the sump, the condensate from the sump into the boiler, ie the steam generator pushed out.
  • the attached figure shows a plant 10, the three consumers 12, 14, 16, which operate at different pressures.
  • the number of consumers is not limited to three. Any number of consumers may be provided who operate on varying and / or temporarily equal pressures.
  • Each consumer 12, 14, 16 is supplied via a steam line 18 with steam as a working medium from a steam boiler 20.
  • an associated valve element 13, 15, 17 is provided between the common main steam line 18 and each consumer 12, 14, 16.
  • means for adjusting the vapor pressure or the like in the respective supply line to one or more of the consumers 12, 14, 16 may be mounted.
  • a steam trap 22, 24, 26 is provided, each of which opens into a collector 23, 25, 27.
  • the collector 23, 25, 27 causes a drainage of the condensate by preferably the geodetic height difference, d. H. it is arranged such that the condensate flows in the direction of a collecting container 32, 34, 36 due to gravity.
  • Each consumer 12, 14, 16 is associated with a collecting container 32, 34, 36, which is fluidly connected to the respective collector 23, 25, 27 via a valve element 33, 35, 37, the only one flow in the direction of the collecting container 32, 34, 36 out.
  • each collecting tank branches off a sump steam generator line 42, 44, 46, wherein these individual lines 42, 44, 46 open into a common manifold 48 to the boiler 20.
  • the lines 42, 44, 46 which branch off in the upper region of each collecting container 32, 34, 36, likewise have a valve which determines the direction of flow through the valve from the collecting container 32, 34, 36 in the direction of the steam boiler 20.
  • the system 10 further includes a motive water tank 50.
  • a supply line 58 which includes a redundant running pump device 59 to the collection containers 32, 34, 36, wherein the common supply line 58 in branch lines 52, 54, 56, the respective collecting containers 32, 34, 36 are branched.
  • Each of the branch pipes 52, 54, 56 is provided with a shut-off valve 53, 55, 57 so that the supply of motive water from the motive water tank 50 to a specific header tank 32, 34 or 36 can be permitted or inhibited.
  • the branch lines 52, 54, 56 lead into the bottom area of the collecting containers 32, 34, 36, so that motive water can be pumped out of the motive water container 50 into the bottom area of the respective collecting containers 32, 34, 36 by virtue of the pump device 59.
  • Corresponding internal installations of the collecting container 32, 34, 36 have the effect that a mixing of supplied driving water with the container contents to be displaced is largely avoided.
  • From each sump 32, 34, 36 associated drive water return lines 62, 64, 66, which open into a common return line 68, back to the drive water tank 50.
  • These return lines 62, 64, 66 branches from the bottom region of the respective collection container 32, 34, 36th from and are provided with a respective shut-off valve 63, 65, 67 by means of which a collecting tank 32, 34, 36 associated drive water return line 62, 64, 66 controlled open or can be closed.
  • a water level sensor 91 is attached to the headers 32, 34, 36 as shown in the figure.
  • the feedwater supply line 58 is provided with a temperature sensor 72, which detects the temperature T3 of the drive water.
  • Other temperature sensors 74, 76 or other elements for temperature detection are provided on the collecting container 32, 34, 36 to the temperature T1 of the condensate in the collecting container or the temperature T2 of the water or steam in the collecting container to be able to capture.
  • the temperature sensors 72, 74, 76 are coupled to a control device 80, 82, 84, which respectively evaluates the temperature difference between the motive water temperature T3 and the temperature of the condensate T 1 and the temperature T2 of the water or steam, and optionally when reaching a threshold value Temperature difference ensures that a new process step is initiated.
  • a direct connection of the manifold 48 to the motive steam tank 50 is present in the system with a valve 78.
  • condensate flows from the collecting tank 32 or / and 34 or / and 36 into the motive water tank 50.
  • the valve 79 prevents the outflow of boiler water into the propellant tank 50.
  • each of the three consumers 12, 14, 16 or each of the consumers 12, 14, 16 associated condensate recirculation is shown in another operating stage.
  • the condensate recirculation of the individual consumers are operated independently of each other, so that several consumers or associated condensate recirculation can be in the same operating stage at a given time and the condensate recirculation for individual consumers within the operating stages can dwell different lengths.
  • the left-hand consumer 12 is shown in the first operating stage, in which condensate flows via the steam trap 22 into the collector 23 and from there into the collecting container 32.
  • the connections (inflow and outflow) to the motive water tank 50 are closed, ie the valves 63, 53 are closed, so that motive water is neither supplied to the collecting container 32 nor discharged therefrom. Since no pressure reduction is made, accumulates steam-free condensate in the sump 32.
  • the water level sensor 91 detects the intended maximum level (switching point) of the condensate fed into the collecting container 32.
  • a threshold temperature detected by, for example, a temperature sensor may be used to control the condensate return cycle.
  • the first stage of the condensate recycle cycle ends. This end of the first stage is equivalent to the beginning of the second stage, in which condensate is ejected from the sump into the boiler 20. This second stage is shown for the middle consumer 14 in the figure.
  • the shut-off valve 55 which connects the feed water tank 50 to the bottom of the sump 34, is opened so that motive water can be pumped into the sump 34 by the action of the pump 59.
  • the valve 35 between the collector 25 from the steam trap 24 and the collecting tank 34 prevents backflow of the condensate into the collector 25.
  • the condensate is pushed through the condensate return line 44 in the line 48 and from there into the boiler 20. This expulsion continues as long as the valve 55, which controls the supply of motive water to the sump 34, remains open.
  • the opening duration of the valve 55 is determined by the temperature difference between the motive water having a temperature T3 detected in the motive water supply line 58 by the temperature sensor 72 and the condensed temperature T 1 of the condensate tank 34.
  • the controller 82 causes the valve 55 to be closed.
  • the valve 65 Simultaneously with the closing of the valve 55, the valve 65, which allows a drive water return line 64 to the drive water tank 50, opened.
  • This process step is shown for the right-hand consumer 16 in the figure.
  • the temperature T2 of the motive water condensate mixture in the collecting container 36 is detected at the temperature sensor 76. If it rises above a certain value, i. H. T2 again becomes significantly greater than T3, this means that no motive water has remained in the useful range of the collecting container. Then, the valve 67 is closed, so that no return of driving water via the return line 66, 68 in the motive water tank 50 is possible. This is equivalent to the end of the third stage condensate return. Subsequently, the process cycle starts again.
  • the illustrated system can thus easily a condensate return at a plant that operates several consumers locally parallel and simultaneously with different and changing pressures obtained.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
EP05013516A 2004-10-15 2005-06-22 Système fermé pour la récupération de condensat et procédé fermé pour la récupération de condensat Pending EP1647768A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410050378 DE102004050378A1 (de) 2004-10-15 2004-10-15 Geschlossenes System zur Kondensatrückspeisung und geschlossenes Verfahren zur Kondensatrückspeisung

Publications (1)

Publication Number Publication Date
EP1647768A1 true EP1647768A1 (fr) 2006-04-19

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Application Number Title Priority Date Filing Date
EP05013516A Pending EP1647768A1 (fr) 2004-10-15 2005-06-22 Système fermé pour la récupération de condensat et procédé fermé pour la récupération de condensat

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EP (1) EP1647768A1 (fr)
DE (1) DE102004050378A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006011115U1 (de) * 2006-07-17 2007-12-06 Hödl, Alois Kondensatrückführung in geschlossenen Dampfanlagen, insbesondere zur Beheizung von Riffelwalzen für die Wellpappenherstellung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014111263A1 (de) * 2014-08-07 2016-03-10 Endress+Hauser Flowtec Ag Frühwarnsystem für kondensationsinduzierte Wasserschläge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931344A (en) * 1956-10-04 1960-04-05 Far Western Chemical Co Inc Closed condensate return and boiler feed system
US3813037A (en) * 1972-06-13 1974-05-28 M Bekedam Closed condensate system
DE3301573A1 (de) * 1983-01-19 1984-07-19 Eisenwerk Theodor Loos Gmbh, 8820 Gunzenhausen Einrichtung zur waermerueckgewinnung aus dampfkondensat
US6196163B1 (en) * 2000-01-19 2001-03-06 Chandrakant S. Shah Boiler feed water heat energy saver

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931344A (en) * 1956-10-04 1960-04-05 Far Western Chemical Co Inc Closed condensate return and boiler feed system
US3813037A (en) * 1972-06-13 1974-05-28 M Bekedam Closed condensate system
DE3301573A1 (de) * 1983-01-19 1984-07-19 Eisenwerk Theodor Loos Gmbh, 8820 Gunzenhausen Einrichtung zur waermerueckgewinnung aus dampfkondensat
US6196163B1 (en) * 2000-01-19 2001-03-06 Chandrakant S. Shah Boiler feed water heat energy saver

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"BE AWARE OF PUMPLESS METHODS FOR RETURNING CONDENSATE IN SMALL SYSTEMS WITH MODERATE CONDITIONS, A PUMP CAN BE A SOURCE OF CONSTANT TROUBLE", POWER, MCGRAW-HILL COMPAGNY, NEW YORK, NY, US, vol. 137, no. 10, 1 October 1993 (1993-10-01), pages 83 - 84, XP000400297, ISSN: 0032-5929 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006011115U1 (de) * 2006-07-17 2007-12-06 Hödl, Alois Kondensatrückführung in geschlossenen Dampfanlagen, insbesondere zur Beheizung von Riffelwalzen für die Wellpappenherstellung

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