CN103528046A - Steam condensation water collection device and method for preventing cavitation corrosion of water transfer pump - Google Patents

Steam condensation water collection device and method for preventing cavitation corrosion of water transfer pump Download PDF

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Publication number
CN103528046A
CN103528046A CN201310528533.2A CN201310528533A CN103528046A CN 103528046 A CN103528046 A CN 103528046A CN 201310528533 A CN201310528533 A CN 201310528533A CN 103528046 A CN103528046 A CN 103528046A
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CN
China
Prior art keywords
water
liquid level
delivery pump
pump
transfer pump
Prior art date
Application number
CN201310528533.2A
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Chinese (zh)
Inventor
田丽焕
王勤
柏萌
王宝来
胡小营
白立晓
井博勋
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天津市化工设计院
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Application filed by 天津市化工设计院 filed Critical 天津市化工设计院
Priority to CN201310528533.2A priority Critical patent/CN103528046A/en
Publication of CN103528046A publication Critical patent/CN103528046A/en

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Abstract

The invention discloses a steam condensation water collection device and a method for preventing cavitation corrosion of a water transfer pump. The steam condensation water collection device comprises a water tank, the water transfer pump, a pipeline, a valve and an electric control and measurement instrument, wherein a water outlet of the water tank of the steam condensation water collection device is connected to an inlet of the water transfer pump; the water tank and the water transfer pump are placed on the ground; a water outlet A2 of the water tank is connected to an inlet A6 of the water transfer pump; an outlet A8 of the water transfer pump is connected to a boiler room through the pipeline. The condensation water flows into the water tank when a condensation water valve V1 is opened, an inlet valve V2 and an outlet valve V3 of the water transfer pump are opened when the water level is a normal water level, and the water transfer pump is started up to pump the condensation water into the boiler room so as to keep the water tank at the normal liquid level; when the liquid level drops to the lowest liquid level, the lowest liquid level is interlinked with the water transfer pump and the water transfer pump is stopped to prevent cavitation corrosion of the pump.

Description

Steam condensation water collecting device and prevent the method for water-delivery pump cavitation erosion
Technical field
The present invention relates to steam condensation water collecting device and prevent the method that water-delivery pump cavitates.
Background technology
Along with the development of market economy, the recovery of steam condensate and utilization generally come into one's own in the field of energy-conservation and environmental protection.It is to reducing boiler oil consumption, and using water wisely, saves water treatment expense, reduces the pollution of waste heat, remaining vapour, and prolonged boiler and heat network system operating period etc. all has important value.
According to China's relevant energy saving policy for many years, when regulation steam is used vapour, condensate recovery percentage should not be less than 70%.
Steam condensate device is exactly when steam condensate can not return to boiler room in the mode of gravity flow or overbottom pressure, and condensate water is assembled and reclaimed, and pumps up and returns to boiler room.
Steam condensate device is mainly comprised of water pot, water pump, pipeline and electrical control and measuring instrument.
At present, domestic steam condensate device adopts as shown in Figure 1, and key facility comprises water pot, water-delivery pump, pipeline, valve and electrical control and measuring instrument composition etc.Water pot is provided with the device of automatic control water level, and acousto-optic alarm signal passes to control room, when water pot liquid level is high, manually starts water pump, when water pot liquid level is low, and the pump of manually cutting off the water.
Pump cavitation principle: when water flows in impeller of pump, swerve therein and wait flow feature due to the shape of blade and liquid stream, determined the pressure distribution that in runner, liquid flows, exist some local depression district near non-working surface blade inlet.When the flow stream pressure in low-pressure area is reduced to the saturated vapour pressure of corresponding fluid temperature, water just starts vaporization and forms steam bubble; Steam bubble flow to the instantaneous solidifying mistake (crumbling and fall) again of the higher part of pressure with liquid stream in runner, at bubble, coagulates the moment of losing, and bubble liquid around pours rapidly the solidifying hole of losing formation of bubble, and with local high temperature, high pressure water hammer,
Harm:
(1) pump performance declines suddenly;
(2) pump produces vibration and noise;
(3) overcurrent of pump partly produces destruction.
The temperature that condensate system is returned to water pot is generally 80~100 ℃, the permission net positive suction head of water pump is generally at 2~5 meters (pump producer samples), if do not consider the setting height(from bottom) of water pump, water pump is easy to produce cavitation, affect the life-span of water pump, the continuous operation of device is affected.
Summary of the invention
In order to solve existing technical problem, the present invention discloses a kind of steam condensation water collecting device and prevents the method for water-delivery pump cavitation erosion, solves the potential safety hazard existing in production process, improves the economic benefit of process units.
Technical scheme of the present invention is as follows:
A water collecting device, comprises water pot 1, water-delivery pump 2, pipeline, valve and electrical control and measuring instrument; The water pot delivery port that it is characterized in that steam condensation water collecting device is connected with water-delivery pump import, and water pot and water-delivery pump are all put on the ground; Water pot 1 water outlet A 2 is connected with water-delivery pump 2 import A6, and water-delivery pump outlet A8 is connected with boiler room by pipeline.
Adopt device of the present invention to collect the method for steam condensate, condensate valve V1 is opened, condensate water flows in water pot, liquid level, when normal liquid level, is opened water-delivery pump inlet valve V2, water-delivery pump outlet valve V3, start water-delivery pump 2, condensate water is got to boiler room, keep water pot liquid level in normal liquid level; When liquid level is down to minimum liquid level, make minimum liquid level and water-delivery pump interlocking, stopping transportation water pump, prevents pump cavitation.
Described water pot minimum liquid level, i.e. water-delivery pump setting height(from bottom).By surveying liquid level element, according to the pressure of water pot bottom, convert liquid level.
Be described in detail as follows:
Condensate valve V1 is opened, and condensate water flows in water pot, and liquid level, when normal liquid level, is opened water-delivery pump inlet valve V2, and water-delivery pump outlet valve V3 starts water-delivery pump 2, and condensate water is got to boiler room, keeps water pot liquid level at normal liquid.When liquid level is down to minimum liquid level, make minimum liquid level and water-delivery pump interlocking, stopping transportation water pump, prevents pump cavitation.
Fig. 1 control program is: the temperature of solidifying water pot is indicated on the spot, liquid level teletransmission to distributed monitoring control system (hereinafter to be referred as DCS) indication bound reported to the police.
Fig. 2, on the basis of the original control of Fig. 1, optimizes as follows:
Former control program is: the temperature of solidifying water pot is indicated on the spot; Liquid level signal L(unit is: m), teletransmission to the Distributed Control System (DCS) of Central Control Room is indicated and bound is reported to the police.
On the basis of original control, be optimized, be specially:
Increase thermometer (platinum resistance thermometer sensor), for measuring the temperature T (unit is: ℃) of solidifying water pot.This temperature signal by teletransmission to DCS.DCS will go out real-time " A " value (A=Po-Pv/ ρ g-△ h-Hf) with this calculated signals, (unit is: m).This value will become " the interlocking value " of lower limit interlocking under solidifying water pot liquid level.
Control method is as shown in Figure 3:
About solidifying water pot liquid level, by surveying liquid level element, according to the pressure of water pot bottom, convert liquid level L.In DCS, increase lower limit interlocked control under liquid level, as when L≤A, expression pump will cavitate, just DCS can judge and control signal is delivered to water-delivery pump electrical control cabinet, realize automatic stopping transportation water pump 2, to protect pump to avoid liquid level low and damage.Meanwhile, increase normal liquid level B interlocked control, this control signal will be delivered to water-delivery pump electrical control cabinet, realize and when liquid level reaches normal B, automatically open pump.Therefore the present invention has good protection effect for pump.
In calculating the formula of A value, all there is one-to-one relationship with T value in Pv and ρ value, DCS can, according to the T value of measuring in real time, find real-time Pv and the ρ value of correspondence automatically, thereby calculate real-time A value (in formula, other values are constant), A value only has lower limit requirement.
Consider that medium temperature is less than 200 ℃, so select platinum resistance thermometer sensor, (Pt100) as on-the-spot temperature element.Control main element: 1 of thermal resistance, the some rice of signal cable, corresponding construction debugging.
Whole control procedure is: platinum resistance thermometer sensor, signal T enters DCS, and DCS calculates A value, simultaneously, the liquid level L value recording, will compare with A value, if L≤A, export a switching value signal DO1(dry contact) to water-delivery pump electrical control cabinet, realize automatic stopping transportation water pump 2, and keep this state.When liquid level L value is more than or equal to upper limit interlocking value, DCS is a switching value signal DO2(dry contact of output automatically) give water-delivery pump electrical control cabinet, realize and automatically open water-delivery pump 2.Therebetween, the sound and light alarm that DCS has the liquid level upper limit or liquid level lower limit is with alert.Higher limit, lower limit and upper higher limit set and key in DCS by engineer.
Adopt said method reach water pot liquid level L with water pot liquid level apart from water-delivery pump inlet height A comparison, as L >=A, by controlling liquid level value A, prevented from that water-delivery pump from producing to cavitate.The problem that has solved the safety in production of device, main is to have got rid of potential safety hazard, the safe operation of assurance device.
Accompanying drawing explanation
Fig. 1: original steam condensation water recovery system flow process diagram.
Fig. 2: steam condensate recovery system flow process diagram of the present invention.
Fig. 3: control plan of locking.
Note: 1-steam-condensation water pot, 2-water-delivery pump LIA-liquid level indication warning, LIAS-liquid level indication warning interlocking, the indication of PI-pressure, the indication of TI-temperature, M-motor, PW-steam condensate (SC), the high limit of H-liquid level, the high limit of HH-liquid level, L-liquid level lower bound, LL-liquid level lower bound
The specific embodiment
According to content as described in Figure 2, water pot and water-delivery pump pipeline, valve are connected.Condensate valve V1 is opened, and condensate water flows in water pot, and liquid level, when normal liquid level, is opened water-delivery pump inlet valve V2, and water-delivery pump outlet valve V3 starts water-delivery pump 2, and condensate water is got to boiler room, keeps water pot liquid level at normal liquid.When liquid level is down to minimum liquid level, make minimum liquid level and water-delivery pump interlocking, stopping transportation water pump, prevents pump cavitation, when liquid level reaches normal liquid level, automatically opens pump.Provision for thermal insulation is carried out in all pipeline insulations.
The concrete data of water-delivery pump setting height(from bottom) are as follows:
The temperature that condensate system is returned to water pot is generally 80~100 ℃, the permission net positive suction head of water pump is generally at 2~5 meters, the permission net positive suction head that selects water pump is 2~5 meters, between water pot and water-delivery pump, pipeline is very short, pipe resistance is fallen and is ignored, atmospheric pressure is 101.33kPa, and according to the computing formula of liquid level, at different water delivery temperature, liquid level A value is as following table:
Attached: liquid level A computing formula: (calculating negative value is that pump inlet is under liquid level)
A=P 0-P v/ρg-△h-Hf
P 0-for sucking the pressure of tank level top, N/m 2
P v-be the saturated vapor pressure of liquid under operating temperature, N/m 2
ρ-for being transferred the density of liquid, kg/m 3
G-be acceleration of gravity, m/s 2
△ h-be pump permission net positive suction head, m
Hf-be flow through whole pressure losses of suction line of liquid, m.

Claims (4)

1. a steam condensation water collecting device, comprises water pot 1, water-delivery pump 2, pipeline, valve and electrical control and measuring instrument; The water pot delivery port that it is characterized in that steam condensation water collecting device is connected with water-delivery pump import, and water pot and water-delivery pump are all put on the ground; Water pot 1 water outlet A 2 is connected with water-delivery pump 2 import A6, and water-delivery pump outlet A8 is connected with boiler room by pipeline.
2. utilize the method for the device collection steam condensate of claim 1, it is characterized in that condensate valve V1 to open, condensate water flows in water pot, liquid level is when normal liquid level, open water-delivery pump inlet valve V2, water-delivery pump outlet valve V3, starts water-delivery pump 2, condensate water is got to boiler room, keep water pot liquid level in normal liquid level; When liquid level is down to minimum liquid level, make minimum liquid level and water-delivery pump interlocking, stopping transportation water pump, prevents pump cavitation.
3. method as claimed in claim 2, is characterized in that described water pot minimum liquid level, i.e. water-delivery pump setting height(from bottom).
4. method as claimed in claim 2, is characterized in that according to the pressure of water pot bottom, converting liquid level by surveying liquid level element.
CN201310528533.2A 2013-10-30 2013-10-30 Steam condensation water collection device and method for preventing cavitation corrosion of water transfer pump CN103528046A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106461207A (en) * 2014-05-09 2017-02-22 蒂埃尔威有限公司 Drain recovery device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1137408A (en) * 1997-07-16 1999-02-12 Hashimoto Yasuyoshi Vacuum steam boiler promoting generation of vacuum steam by carrying out reduced pressure operation even at non-load time
CN2713379Y (en) * 2004-04-16 2005-07-27 李强 Novel energy-saving vapor condensation water recovery device
CN200986179Y (en) * 2006-11-28 2007-12-05 宋斌 Non steam corroding condensate recoverer
CN201116726Y (en) * 2007-07-11 2008-09-17 泉州市天龙环境工程有限公司 Condensation water reclaiming device
CN201314546Y (en) * 2008-10-17 2009-09-23 山东中德设备有限公司 Condensate water reclaimer under pressure
CN201327018Y (en) * 2008-10-29 2009-10-14 张明亮 Steam condensate recovery device
CN201795472U (en) * 2010-09-03 2011-04-13 吉林省乳业集团广泽有限公司 Hermetic condensed water recovery system
CN202868666U (en) * 2012-08-30 2013-04-10 昆山乐为能源环保设备有限公司 Steam condensate recycling device
CN203240566U (en) * 2013-03-19 2013-10-16 山东岐黄中药饮片有限公司 Steam condensate water recycling device
CN203549785U (en) * 2013-10-30 2014-04-16 天津市化工设计院 Steam condensation water collecting device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1137408A (en) * 1997-07-16 1999-02-12 Hashimoto Yasuyoshi Vacuum steam boiler promoting generation of vacuum steam by carrying out reduced pressure operation even at non-load time
CN2713379Y (en) * 2004-04-16 2005-07-27 李强 Novel energy-saving vapor condensation water recovery device
CN200986179Y (en) * 2006-11-28 2007-12-05 宋斌 Non steam corroding condensate recoverer
CN201116726Y (en) * 2007-07-11 2008-09-17 泉州市天龙环境工程有限公司 Condensation water reclaiming device
CN201314546Y (en) * 2008-10-17 2009-09-23 山东中德设备有限公司 Condensate water reclaimer under pressure
CN201327018Y (en) * 2008-10-29 2009-10-14 张明亮 Steam condensate recovery device
CN201795472U (en) * 2010-09-03 2011-04-13 吉林省乳业集团广泽有限公司 Hermetic condensed water recovery system
CN202868666U (en) * 2012-08-30 2013-04-10 昆山乐为能源环保设备有限公司 Steam condensate recycling device
CN203240566U (en) * 2013-03-19 2013-10-16 山东岐黄中药饮片有限公司 Steam condensate water recycling device
CN203549785U (en) * 2013-10-30 2014-04-16 天津市化工设计院 Steam condensation water collecting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106461207A (en) * 2014-05-09 2017-02-22 蒂埃尔威有限公司 Drain recovery device

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Application publication date: 20140122