CN203454917U - Condenser cleaning system in turbine closed circulating water system - Google Patents
Condenser cleaning system in turbine closed circulating water system Download PDFInfo
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- CN203454917U CN203454917U CN201320533973.2U CN201320533973U CN203454917U CN 203454917 U CN203454917 U CN 203454917U CN 201320533973 U CN201320533973 U CN 201320533973U CN 203454917 U CN203454917 U CN 203454917U
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Abstract
The utility model discloses a condenser cleaning system in a turbine closed circulating water system. The condenser cleaning system is characterized in that according to the turbine closed circulating water system which comprises a cooling tower, a condenser and an open water system, a settling tank is arranged on an outlet of the condenser, outlet water of the settling tank and outlet water of the open water system flow into the cooling tower together, solid particles discharged from the bottom of the settling tank enter the condenser again from a water inlet of the condenser, and the solid particles are ceramsite sand with the intensity ranging from 1g/cm<3> to 2g/cm<3>. According to the closed circulating water system, by using the ceramsite sand for simulating the cleaning effect of sand in the open circulating water system on a tube bundle, the burden on a rubber ball washing device can be greatly relieved, the tube bundle can be kept clean and prevented from being corroded, and the condenser cleaning system can even completely replace the rubber ball washing device.
Description
Technical field
The utility model relates in fired power generating unit the cleaning systems for turbine condenser, by clean, reduces tube bank fouling and corrosion.
Background technology
Energy-saving for Thermal Power Units work meaning is great.In the energy conservation of fired power generating unit, reducing turbine back pressure has very consequence, and usually, for clammy unit, back pressure reduces 1kPa, and units consumption reduces by 0.6～2%, i.e. about 2～6g/ (kW.h), stochastic pattern and load variations and difference; Condenser terminal difference increases by 1 ℃, and unit coal consumption increases 1g/ (kW.h) or more.For 1 600MW unit, can think, coal consumption increases 1g/ (kW.h), and the annual fuel consumption increasing is worth 2,500,000 yuan.
Turbine back pressure is to be determined by circulating water temperature, temperature rise, condenser terminal difference:
Ts=T1+ΔT+δt
Wherein:
Ts is is the saturation temperature that turbine back pressure is corresponding with condenser pressure, ℃;
T1 is circulating water temperature, ℃; For open circulation water system, for environment water temperature, for closed circle water system, depend on quantity of circulating water, cooling tower performance and condenser duty;
Δ T is recirculated water temperature rise, ℃; Depend on condenser duty and quantity of circulating water;
δ t is condenser terminal difference, ℃; Vacuum tightness is bad, or bank of condenser pipes fouling, all can increase thermal resistance, increases condenser terminal difference.Especially the latter, is the problem of the commonplace existence of current large electric power plant unit.
Turbine back pressure Pn is obtained according to steam Property table or formula by Ts.
In clammy unit, great majority configuration closed circle water system.In clammy unit, condenser is all equipped with ball cleaning apparatus, conventionally regularly bank of condenser pipes is cleaned 1～2 hour every day.
In China, steam turbine cycle water system has two kinds of forms, is respectively steam turbine closed circle water system and steam turbine open circulation water system, is positioned at along the Yangtze River and conventionally adopts steam turbine open circulation water system with the fired power generating unit on seashore.So-called steam turbine open circulation water system is to using river or seawater as cooling water, gets back to environment water after completing heat exchange in condenser.In actual motion, in this form, the duty of condenser is generally relatively good, and its reason is in water body, to have river sand or sea sand, and the equipment such as sand condenser and tube bank have good cleaning action.In these lighter groups, a part has been removed ball cleaning apparatus.
Recirculated cooling water in steam turbine closed circle water system is after taking out from environmental water systems, need after the processing such as precipitation and dosing, enter again circulation, in condenser, complete after heat exchange, enter cooling tower cooling, by water circulating pump, squeeze into condenser again, realize the Reusability to recirculated water.This system water quality relative clean, only contains a small amount of mud and dirt, almost there is no sand, and in actual motion, ball cleaning apparatus must remain on good state, and often uses.But in fact,, due to aspects such as design, manufacture, operation, maintenances, the ball cleaning apparatus of domestic large unit, still has quite a few state unsatisfactory at present.In the condenser of domestic large electric power plant unit, there is the cleanliness factor of significant proportion lower, back pressure and units consumption are had to obvious adverse effect.For copper pipe bundle, general design cleanliness factor is 0.8～0.85, for stainless steel, restrain, design cleanliness factor is generally 0.85～0.9, but the condenser cleanliness factor long term maintenance of actual a lot of large units 0.5～0.6 low-level on, the corresponding rising of back pressure reaches the rank of 1kPa, brings very large loss.
Utility model content
The utility model is for avoiding the existing weak point of above-mentioned prior art, for steam turbine closed circle water system, provide condenser cleaning system in a kind of steam turbine closed circle water system, cleaning action with sand in simulation steam turbine open circulation water system, reach reduction turbine back pressure, reduce units consumption, reduce the utility model object of tube bank fouling and corrosion simultaneously.
The utility model is that technical solution problem adopts following technical scheme:
In the utility model steam turbine closed circle water system, the feature of condenser cleaning system is: for the steam turbine closed circle water system that includes cooling tower, condenser and open water system, exit at described condenser arranges sedimentation basin, the water outlet of described sedimentation basin and the water outlet of open water system enter cooling tower jointly, and the solid particle of discharging in the bottom of described sedimentation basin reenters condenser from the water inlet of condenser; Described solid particle is that density is 1～2g/cm
3haydite husky.
In the utility model steam turbine closed circle water system, the feature of condenser cleaning system is also: the particle diameter of described haydite sand is 0.5～5mm, and is less than in steam turbine cycle water system the diameter of filter screen hole everywhere.
In the utility model steam turbine closed circle water system, the feature of the clean method of condenser is:
For the steam turbine closed circle water system that includes cooling tower, condenser and open water system, the cleaning action of sand to tube bank in simulation steam turbine open circulation water system, in the recirculated water of steam turbine closed circle water system, add solid particle, form containing solid particle recirculated water;
Exit at described condenser arranges sedimentation basin, and the water outlet of sedimentation basin and the water outlet of open water system enter cooling tower jointly, and the solid particle being precipitated in sedimentation basin reenters condenser from the water inlet of condenser;
Described solid particle is that density is 1～2g/cm
3haydite husky.
In the utility model steam turbine closed circle water system, the feature of the clean method of condenser is also: the particle diameter of described haydite sand is 0.5～5mm, and is less than in steam turbine cycle water system the diameter of filter screen hole everywhere; Described is in the ratio of 50～300ppm, to add haydite husky in recirculated water containing solid particle recirculated water.
Compared with the prior art, the utility model beneficial effect is embodied in:
1, the utility model is for steam turbine closed circle water system, the cleaning action of sand to tube bank in simulation steam turbine open circulation water system, can greatly alleviate the burden of ball cleaning apparatus, keep tube bank to clean and prevent corrosion, substitute ball cleaning apparatus even completely.The glueballs that the operation of glueballs device is lost for 1 year is worth and will reaches 100,000 yuan of ranks, the haydite after the utility model screening, and 4,000 yuan/ton only of prices, an annual cost can not surpass 20,000, and obviously, the utility model implementation cost is significantly less than ball cleaning apparatus.
2, the husky density of the utility model haydite is taken as 1～2g/cm
3, it is more than or equal to the proportion of water, and cleaning effect is good.
3, the utility model is by arranging sedimentation basin, solid particle is only circulated in condenser, do not enter cooling tower, avoided being more than or equal to water and in cooling tower, forming precipitation due to the proportion of solid particle, thereby realize the cleaning repeatedly to condenser, also reduced the input amount of solid particle in system.
Accompanying drawing explanation
Fig. 1 be the utility model for steam turbine closed circle water system schematic diagram.
The specific embodiment
Referring to Fig. 1, in the present embodiment, in steam turbine closed circle water system, condenser cleaning system structure is set to:
For the steam turbine closed circle water system that includes cooling tower, condenser and open water system formation, exit at condenser arranges sedimentation basin, the water outlet of sedimentation basin and the water outlet of open water system enter cooling tower jointly, and the solid particle of discharging in the bottom of sedimentation basin reenters condenser from the water inlet of condenser; Solid particle is that density is 1～2g/cm
3haydite husky, selecting the particle diameter of haydite sand is 0.5～5mm, and is less than in steam turbine cycle water system the diameter of filter screen hole everywhere.
In the present embodiment, in steam turbine closed circle water system, the clean method of condenser is:
For the steam turbine closed circle water system that includes cooling tower, condenser and open water system, the cleaning action of sand to tube bank in simulation steam turbine open circulation water system, in the recirculated water of steam turbine closed circle water system, add solid particle, form containing solid particle recirculated water; Exit at condenser arranges sedimentation basin, and the water outlet of sedimentation basin and the water outlet of open water system enter cooling tower jointly, and the solid particle being precipitated in sedimentation basin reenters condenser from the water inlet of condenser; Solid particle is that density is 1～2g/cm
3haydite husky; The particle diameter of haydite sand is 0.5～5mm, and is less than in steam turbine closed circle water system the diameter of filter screen hole everywhere; Described is in the ratio of 50～300ppm, to add haydite husky in recirculated water containing solid particle recirculated water.
Steam turbine closed circle water system in the present embodiment refers to the water system that is equipped with cooling tower, cooling water circulation to use.This system at home in fired power generating unit ratio maximum.
For solid particle, by following requirement, select:
Material: be chosen as inorganic material, without putrefaction, the not deliquescing of chance water, do not expand.
Density: in steam turbine open circulation water system, sand is recycled water and is sweeping along and constantly enter condenser, tube bank is washed away, even if sand density reaches 2g/cm
3, because the water speed of 1～2m/s is swept along, can't sedimentation, based on this, it is 1～2g/cm that the utility model is selected the density of solid particle
3.
Size: wash away in order to realize effectively, the size of solid particle should be too not little, but for prevent cooling tower spray nozzle clogging, and can be smoothly by system for miscellaneous equipment is carried out to cooling open water system, its size can not reach Centimeter Level.Therefore, the solid particle adding for well, and is less than in steam turbine cycle water system the diameter of filter screen hole everywhere with the particle diameter of 0.5～5mm, to prevent causing heat exchanger to be cut off the water supply because filter screen hole stops up.
Hardness: for stainless steel tube bank, the solid particle adding can be harder, but for softer copper pipe bundle, pellet hardness should significantly not be greater than copper pipe, to prevent from scratching tube bank.Generally, and tube bank material hardness should be basic identical.The solid particle of sand, quartz sand one class, as long as no sharp-pointed corner, and subglobular, just can avoid the damage to bank of condenser pipes.
Form: the solid particle the adding sharp-pointed corner that do not have can be the porous form of closed type, and subglobular is better.
Cheap spherical haydite sand is the first-selection that meets above requirement in the market, 1～2g/cm
3density value be the husky density of common haydite.This density is approximately 1/2 of Jiang Sha, therefore, from the angle of volume, sees percent sand, and the haydite of 50～300ppm, about the same in the Jiang Sha of 100～600ppm, and more intensity is larger for the husky density of haydite.Larger density, is conducive to strengthen cleaning performance.
The density of selected haydite sand is greater than 1g/cm
3, but due to the flow velocity of water, it can't sedimentation in current, goes out after condenser, by shallow sink device, carries out sedimentation, collection, more sharp husky pump is transported to condenser water inlet, realizes iterative cycles and cleans.
In addition, the circulation of every unit, no matter be open type or closed circle water system, all comprise an open cooling water system, immediate boiling water system, open water system refers in unit operation, utilizes the sub-fraction of recirculated water as cooling water, to a plurality of heat exchangers such as oil cooler, vavuum pump heat exchangers, carries out cooling.
The present embodiment increases the intensity of haydite sand by increasing the density of haydite sand, and further strengthens cleansing power.Simultaneously, because cooling tower bottom water pool inner water speed is very low, therefore, once heavier ceramsite sand enters cooling tower, can in cooling tower, sink under water, cannot continue circulation, for avoiding the generation of this situation, the sedimentation basin arranging in condenser outlet carries out sedimentation and collection by haydite sand, directly to condenser, circulates, and this structure setting only circulates solid particle in condenser, due to reducing of range of DO, also reduced the input amount of solid particle.
Sedimentation basin is a shallow sink device, and it is widely used in engineering of water treatment practice, simple, reliable.Swash plate or inclined tube-type sedimentation basin are to take up an area minimum, widely used sedimentation basin.For 300MW unit, the largest loop water yield of about 40000t/h, approximately needs 100m
2the sedimentation basin of area.
Operational management requires:
In environment temperature lower winter, fired power generating unit generally adopts minimum quantity of circulating water.But owing to washing away, cleaning, need certain water speed, therefore, even in cold winter, also need the regular short time to move with the recirculated water scheduling mode in season in spring and autumn, to keep bank of condenser pipes effectively clean, and delay tube bank corrosion.
Some northern units, recirculated water water source is underground water, hardness is larger, once bank of condenser pipes is tied hard scale, ball cleaning apparatus is helpless, and the cleaning performance of haydite sand is still to be tested, but at dirt, not yet tie when hard, the cleaning performance of haydite sand is secure.To these units, can in new Construction of Unit or major overhaul, restrain under clean condition, add the husky cleaning of haydite, can effectively prevent that hard scale from forming.
Claims (2)
1. condenser cleaning system in a steam turbine closed circle water system, it is characterized in that: for the steam turbine closed circle water system that includes cooling tower, condenser and open water system, exit at described condenser arranges sedimentation basin, the water outlet of described sedimentation basin and the water outlet of open water system enter cooling tower jointly, and the solid particle of discharging in the bottom of described sedimentation basin reenters condenser from the water inlet of condenser; Described solid particle is that density is 1～2g/cm
3haydite husky.
2. condenser cleaning system in steam turbine closed circle water system according to claim 1, is characterized in that: the particle diameter of described haydite sand is 0.5～5mm, and is less than in steam turbine cycle water system the diameter of filter screen hole everywhere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320533973.2U CN203454917U (en) | 2013-08-29 | 2013-08-29 | Condenser cleaning system in turbine closed circulating water system |
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|---|---|---|---|
| CN201320533973.2U CN203454917U (en) | 2013-08-29 | 2013-08-29 | Condenser cleaning system in turbine closed circulating water system |
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| CN203454917U true CN203454917U (en) | 2014-02-26 |
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| CN201320533973.2U Withdrawn - After Issue CN203454917U (en) | 2013-08-29 | 2013-08-29 | Condenser cleaning system in turbine closed circulating water system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433245A (en) * | 2013-08-29 | 2013-12-11 | 安徽新力电业科技咨询有限责任公司 | Method for cleaning condenser of turbine closed-type circulating water system |
| CN103438757A (en) * | 2013-08-29 | 2013-12-11 | 安徽新力电业科技咨询有限责任公司 | Condenser cleaning system and cleaning method in steam turbine closed type circulating water system |
| CN107121008A (en) * | 2017-06-20 | 2017-09-01 | 中国大唐集团科学技术研究院有限公司华东分公司 | For the condenser cleaning equipment and cleaning guide of open circulation water system |
-
2013
- 2013-08-29 CN CN201320533973.2U patent/CN203454917U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433245A (en) * | 2013-08-29 | 2013-12-11 | 安徽新力电业科技咨询有限责任公司 | Method for cleaning condenser of turbine closed-type circulating water system |
| CN103438757A (en) * | 2013-08-29 | 2013-12-11 | 安徽新力电业科技咨询有限责任公司 | Condenser cleaning system and cleaning method in steam turbine closed type circulating water system |
| CN103433245B (en) * | 2013-08-29 | 2015-05-27 | 安徽新力电业科技咨询有限责任公司 | Method for cleaning condenser of turbine closed-type circulating water system |
| CN103438757B (en) * | 2013-08-29 | 2015-07-08 | 安徽新力电业科技咨询有限责任公司 | Condenser cleaning system and cleaning method in steam turbine closed type circulating water system |
| CN107121008A (en) * | 2017-06-20 | 2017-09-01 | 中国大唐集团科学技术研究院有限公司华东分公司 | For the condenser cleaning equipment and cleaning guide of open circulation water system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140226 Effective date of abandoning: 20150708 |
|
| RGAV | Abandon patent right to avoid regrant |