CN203811020U - Cooling tower blowdown system - Google Patents

Cooling tower blowdown system Download PDF

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Publication number
CN203811020U
CN203811020U CN201420064466.3U CN201420064466U CN203811020U CN 203811020 U CN203811020 U CN 203811020U CN 201420064466 U CN201420064466 U CN 201420064466U CN 203811020 U CN203811020 U CN 203811020U
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CN
China
Prior art keywords
pipe
blow
blowdown
cooling tower
blowdown ditch
Prior art date
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Expired - Lifetime
Application number
CN201420064466.3U
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Chinese (zh)
Inventor
李延伟
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.)
STATE GRID HENAN ENERGY-SAVING SERVICES Co Ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
Henan Enpai High Tech Group Co Ltd
Original Assignee
STATE GRID HENAN ENERGY-SAVING SERVICES Co Ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
Henan Enpai High Tech Group Co Ltd
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Filing date
Publication date
Application filed by STATE GRID HENAN ENERGY-SAVING SERVICES Co Ltd, State Grid Corp of China SGCC, Electric Power Research Institute of State Grid Henan Electric Power Co Ltd, Henan Enpai High Tech Group Co Ltd filed Critical STATE GRID HENAN ENERGY-SAVING SERVICES Co Ltd
Priority to CN201420064466.3U priority Critical patent/CN203811020U/en
Application granted granted Critical
Publication of CN203811020U publication Critical patent/CN203811020U/en
Anticipated expiration legal-status Critical
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

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  • Sewage (AREA)

Abstract

The utility model discloses a cooling tower blowdown system. The cooling tower blowdown system comprises a blowdown ditch arranged below the bottom of a cooling tower, wherein a blowdown port is formed in the end of the blowdown ditch; a partition device is arranged on the lower portion in the blowdown ditch, and partitions the blowdown ditch into a water inlet cavity and a drainage cavity which are communicated with each other; the blowdown port is communicated with the drainage cavity; the blowdown port is connected with a plant waste water collecting pipeline through a drainage pipeline on which a valve is arranged. By adopting the cooling tower blowdown system, the blowdown ditch can be utilized effectively, thereby increasing the dirt content of drained sewage, and sewage at the bottom of the blowdown ditch is drained during overflowing of the cooling tower. The sewage drainage amount of a unit is reduced under the condition of not changing the circulating water concentration ratio of the unit, the allowed concentration ratio of the unit can be increased after the discharge of suspended matter precipitate in circulating water, the sewage drainage amount of the unit is reduced, the running electric energy consumption and equipment loss of waste water treatment equipment are saved, drugs used during treatment of waste water are saved, and good energy-saving benefit and environmental benefit are achieved.

Description

A kind of cooling tower drainage
Technical field
The utility model relates to a kind of drainage, relates in particular to a kind of cooling tower drainage.
Background technology
Cooling tower is for the structures of cold water in a kind of power plant, existing power plant cooling tower generally adopts sewage draining exit single-point discharging modes, the blowdown ditch end of sewage outfalls setting below cooling tower bottom, or sewage outfalls setting, on cooling tower bottom sides edge, is caused the sewage in blowdown ditch in plant area's wastewater collection pipeline by sewage draining exit.Under existing sewage draining exit single-point discharging modes, sewage draining exit can only be discharged the sewage at distance sewage draining exit closer locations place in blowdown ditch, and in blowdown ditch, distance sewage draining exit has a lot of dirts to discharge over 2 meters of positions precipitations.Meanwhile, on existing cooling tower, be also provided with overfall, for limiting water level, when water level carries out draining by overfall during higher than ordinary water level automatically.Cooling tower overfall is arranged near sewage draining exit, the comparatively clean water overflowing directly can be drained in plant area's wastewater collection pipeline by overflow pipe.
Therefore, existing sewage draining exit single-point discharging modes cannot efficiently utilize blowdown ditch precipitation, store up dirty function, the sewage that overflow and blowdown are discharged is not the sewage of containing filth amount maximum truly in cooling tower, and a large amount of recirculated water clean, reusable edible is discharged, directly cause the water consumption of unit unit's generated energy to increase, the work for the treatment of amount of sewage treatment equipment increases, and the consumption of sewage treatment equipment, medicine increases.
This technology is in power plant's cooling column waste removal equipment, by installing blow-off pipe additional in blowdown ditch bottom, in blow-off pipe bottom, basis is opened the sewage draining exit of different bores apart from distance from original sewage draining exit, thereby change original single-point heavy caliber sewage draining exit, it is the one row's small-diameter hole blowdown of blowdown ditch bottom, can effectively utilize blowdown ditch, improve the dirty rate that contains of effluent sewerage, during cooling column overflow, discharging is also the sewage of blowdown ditch bottom.In the situation that not changing unit recirculated water concentration rate, reduce unit water amount of blowdown, recirculated water inner suspension thing precipitation can also improve the permission concentration rate of unit after discharging, reduce unit water amount of blowdown, save power consumption and the equipment loss of sewage treatment equipment operation, save the medicine using while processing waste water, have good energy-saving benefit and environmental benefit.
Utility model content
The purpose of this utility model is to provide a kind of cooling tower drainage, can give full play to blowdown ditch precipitation, store up dirty function, improve the blowdown rate of blowdown ditch, reduce water consumption, the workload of sewage treatment equipment and the consumption of sewage treatment equipment and medicine of unit generated energy.
The utility model adopts following technical proposals:
A kind of cooling tower drainage, comprise the blowdown ditch that is arranged on below, cooling tower bottom, blowdown ditch end is provided with sewage draining exit, the interior bottom of described blowdown ditch is provided with separating device and blowdown ditch is divided into intake antrum and the drain chamber being connected, sewage draining exit and drain chamber conducting, sewage draining exit connects plant area's wastewater collection pipeline by valvular outer discharge pipe is set.
Described separating device adopts the blow-off pipe that is arranged on top, blowdown ditch bottom surface, and blow-off pipe inner space is drain chamber, and blow-off pipe space outerpace is intake antrum; Blow-off pipe bottom axially offers several mudholes along blow-off pipe, and blow-off pipe is arranged in blowdown ditch, and one end of blow-off pipe is provided with cover plate, and the other end of blow-off pipe connects sewage draining exit; Cover plate is comprised of upper cover plate and lower cover, and upper cover plate is fixed on blow-off pipe end face, and lower cover and upper cover plate are hinged.
Several described mudholes are equidistant evenly to be arranged, and the aperture of the mudhole far away apart from sewage draining exit is greater than the aperture of the mudhole nearer apart from sewage draining exit.
The aperture of several described mudholes is consistent, and the spacing of adjacent two mudholes far away apart from sewage draining exit is less than the spacing of adjacent two mudholes nearer apart from sewage draining exit.
Described blow-off pipe top is provided with a plurality of openings, is provided with anti-floating device on opening, and described anti-floating device comprises flexure strip, and flexure strip rear end is fixed on blow-off pipe tube wall upside, and the front end of flexure strip is fixed with the unidirectional mouthful of check catch for capping opening.
Described top, blowdown ditch bottom surface is provided with two groups of blow-off pipes, and one end of two blow-off pipes connects respectively two sewage draining exits; Blowdown ditch top is provided with solidifying wadding agent chemical feed pipe.
Described separating device adopts the arc that is arranged on top, blowdown ditch bottom surface, and the inner space of arc is drain chamber, and the space outerpace of arc is intake antrum, sewage draining exit and drain chamber conducting.
Described separating device adopts and is inclined at the flat board in blowdown ditch, and the dull and stereotyped space forming with blowdown ditch bottom surface, blowdown ditch the first side wall is drain chamber, and the dull and stereotyped space forming with blowdown ditch the second sidewall is intake antrum, sewage draining exit and drain chamber conducting.
Described dull and stereotyped upper end extension protrudes from blowdown ditch the first side wall.
Described outer discharge pipe connects overflow pipe by inverted U-shaped pipeline.
The utility model is in existing power plant cooling tower waste removal equipment, separating device is set in blowdown ditch and blowdown ditch is divided into intake antrum and the drain chamber being connected, sewage draining exit and drain chamber conducting, sewage draining exit connects plant area's wastewater collection pipeline by valvular outer discharge pipe is set.The utility model utilizes the sewage in intake antrum to bring the sediment of blowdown ditch bottom into drain chamber when entering drain chamber, and discharge by sewage draining exit and outer discharge pipe, give full play to the precipitation of blowdown ditch, store up dirty function, improve the dirty rate that contains of effluent sewerage, in the situation that not changing unit recirculated water concentration rate, reduce unit water amount of blowdown, recirculated water inner suspension thing precipitation can also improve the permission concentration rate of unit after discharging, reduce unit water amount of blowdown, save power consumption and the equipment loss of sewage treatment equipment operation, save the medicine using while processing waste water, there are good energy-saving benefit and environmental benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment 1;
Fig. 2 is the structural representation of cover plate;
Fig. 3 is the structural representation that blow-off pipe is provided with sewage draining exit one side;
Fig. 4 is the structural representation that blow-off pipe is provided with anti-floating device one side;
Fig. 5 is the structural representation of anti-floating device;
Fig. 6 is structural representation when blowdown ditch is inverted trapezoidal in embodiment 1;
Fig. 7 is the structural representation of the utility model embodiment 2;
Fig. 8 is the structural representation of the utility model embodiment 3.
The specific embodiment
Cooling tower drainage described in the utility model, comprise the blowdown ditch 1 that is arranged on below, cooling tower bottom, blowdown ditch 1 end is provided with sewage draining exit 2, the described interior bottom of blowdown ditch 1 is provided with separating device and blowdown ditch 1 is divided into intake antrum 8 and the drain chamber 7 being connected, sewage draining exit 2 and drain chamber 7 conductings, sewage draining exit 2 connects plant area's wastewater collection pipeline 5 by being provided with the outer discharge pipe 4 of valve 3.Sewage in intake antrum 8 will be brought drain chamber 7 into the sediment of blowdown ditch 1 bottom when entering drain chamber 7, and discharges by sewage draining exit 2 and outer discharge pipe 4.
Following the utility model principle of further explaining in conjunction with specific embodiments:
Embodiment 1:
In the present embodiment, as shown in Figure 1, separating device adopts the blow-off pipe 6 that is arranged on blowdown ditch 1 top, bottom surface, and blow-off pipe 6 inner spaces are drain chamber 7, and blow-off pipe 6 space outerpaces are intake antrum 8; Blow-off pipe 6 bottoms are axially equidistantly evenly provided with several mudholes 9 along blow-off pipe 6, and the area of mudhole 9 gross areas and end-of-the-pipe is suitable; The aperture of the mudhole 9 far away apart from sewage draining exit 2 is greater than the aperture of the mudhole 9 nearer apart from sewage draining exit 2.Blow-off pipe 6 is arranged in blowdown ditch 1, and one end of blow-off pipe 6 is provided with cover plate, and the other end of blow-off pipe 6 connects sewage draining exit 2.As shown in Figure 2, cover plate is comprised of upper cover plate 24 and lower cover 25, and upper cover plate 24 is fixed on blow-off pipe 6 end faces for sealing blow-off pipe 6 import the first half, and lower cover 25 is hinged with upper cover plate 24, when lower cover 25 is closed, and whole the closing of blow-off pipe 6 imports; When lower cover 25 upwards lifts, the waste water in blowdown ditch 1 can enter in blow-off pipe 6 from blow-off pipe 6 import the latter halfs; Cover plate 25 can be engaged in cold water tower basin by fulcrum and bracing wire and open outward, when bracing wire, unclamps under the differential pressure action of cover plate 25 inside and outside gravity, buoyancy, blow-off pipe 6 and automatically closes.
The little easy generation deposited phenomenon of speed while passing through blowdown ditch 1 due to the recirculated water falling, also easily accumulates in blowdown ditch 1 containing the more water of salinity.After carrying out blowdown work Open valve 3, pressure in blow-off pipe 6 reduces rapidly, between blow-off pipe 6 inner spaces and space outerpace, mineralization pressure is poor, the sediment of blowdown ditch 1 bottom and entering in blow-off pipe 6 from mudhole 9 under differential pressure action containing the high sewage of dirty rate, then by outer discharge pipe 4, discharge, greatly improve the dirty rate that contains of discharging water, reduced unit water amount of blowdown, can also reduce the workload of clearing up cooling tower blowdown ditch 1 during major overhaul.
In the present embodiment, blow-off pipe 6 coordinates heat expansion to be connected with sewage draining exit 2 by internal-and external diameter.Blow-off pipe 6 lower surfaces and blowdown ditch 1 bottom of trench are apart from 5mm-8mm; The thick steel plate bar of the horizontal pad of the lower surface of blow-off pipe 6 5mm is as blow-off pipe support bar 14; The upper surface of blow-off pipe 6 is connected with blow-off pipe press strip 15, and blow-off pipe press strip 15 can be fixed by screws on blowdown ditch 1 both sides inwall.Mudhole 9 is arranged on blow-off pipe 6 bottoms, can guarantee to enter dirt in blow-off pipe 6 in the situation that of next mudhole 9 water inlet disturbance, and difficult precipitation accumulates in blow-off pipe 6 and causes blow-off pipe 6 to stop up.Owing to being subject to the flow resistance impact of blow-off pipe 6 interior current, large apart from the inside and outside differential pressure of blow-off pipe 6 of sewage draining exit 2 close together positions, little apart from the inside and outside differential pressure of blow-off pipe 6 of sewage draining exit 2 distant positions.Therefore, several mudhole 9 apertures that arrange on blow-off pipe 6 are different, mudhole 9 apertures apart from sewage draining exit 2 proximal most position places are minimum, mudhole 9 apertures at place, centre position are placed in the middle, mudhole 9 apertures apart from sewage draining exit 2 highest distance position places are maximum, can make each mudhole 9 equate to the water flow that resistance equates, each mudhole 9 flows to blow-off pipe 6 of blow-off pipe 6 outlet current.In order simplifying, to calculate and process, the calculation of diameter of mudhole 9, processing can be divided into some sections and to carry out, be generally at least divided into three sections, as shown in Figure 3, the aperture of the mudhole 9 in I section, II section, III section is different.In the present embodiment, also can keep the aperture of mudhole 9 consistent, apart from the spacing between sewage draining exit 2 adjacent two mudholes 9 far away, be less than apart from the spacing between nearer adjacent two mudholes 9 of sewage draining exit 2, to realize the even blowdown of whole blow-off pipe.
As shown in Figure 4 and Figure 5, blow-off pipe 6 tops and mudhole 9 corresponding sections, position are provided with a plurality of openings 11, on opening 11, be provided with anti-floating device 10, described anti-floating device 10 comprises flexure strip 12, flexure strip 12 rear ends are fixed on blow-off pipe 6 tube wall upsides, and the front end of flexure strip 12 is fixed with the unidirectional mouthful of check catch 13 for capping opening 11.When the air pressure in blow-off pipe 6 is greater than pressure that unidirectional mouthful check catch 13 bears and flexure strip 12 elastic force sum, upwards open unidirectional mouthful of check catch 13 one end, and the gas in blow-off pipe 6 is discharged by anti-floating device 10.After gas is discharged, the air pressure in blow-off pipe 6 is less than pressure and the flexure strip 12 elastic force sums that unidirectional mouthful of check catch 13 bears, and unidirectional mouthful of check catch 13 moves downward opening 11 again capping.While carrying out blowdown, under the pressure and flexure strip 12 elastic force effects bearing at unidirectional mouthful of check catch 13, anti-floating device 10 is closed, and the water in blowdown ditch 1 can not enter in blow-off pipe 6 from opening 11.
As shown in Figure 6, the cross section of blowdown ditch 1 can adopt inverted trapezoidal, can make dirt contained in sewage be deposited to blowdown ditch 1 bottom and concentrate, then discharge by mudhole 9 and blow-off pipe 6.
Embodiment 2:
As shown in Figure 7, separating device can adopt the arc 21 that is arranged on blowdown ditch 1 top, bottom surface, and the inner space of arc 21 is drain chamber 7, and the space outerpace of arc 21 is intake antrum 8, sewage draining exit 2 and drain chamber 7 conductings.End contact blowdown ditch 1 bottom surface, two of left and right of arc 21, because blowdown ditch 1 bottom surface is coarse, between arc 21 end faces and blowdown ditch 1 bottom surface, there is gap, the method that can contact by changing arc 21 fracture surface roughness with blowdown ditch 1 bottom surface makes gap occupying a narrow space close to sewage draining exit 2, and the place away from sewage draining exit 2 is large.The process that in sewage, contained dirt and sediment can enter at current drain chamber 7 from intake antrum 8, be brought into the inner space of arc 21, and finally by sewage draining exit 2, discharge.
Embodiment 3:
As shown in Figure 8, separating device adopts and is inclined at the flat board 16 in blowdown ditch 1, flat board 16 is drain chamber 7 with the space that blowdown ditch 1 bottom surface, blowdown ditch the first side wall 22 form, and flat board 16 is intake antrum 8 with the space of blowdown ditch the second sidewall 23 formation, sewage draining exit 2 and drain chamber 7 conductings.Because blowdown ditch 1 bottom surface is coarse, between dull and stereotyped 16 bottoms and blowdown ditch 1 bottom surface, there is gap.The process that in sewage, contained dirt and sediment can enter at current drain chamber 7 from intake antrum 8, be brought in dull and stereotyped 16 drain chamber 7 that form with blowdown ditch 1 bottom surface, blowdown ditch the first side wall 22, and finally by sewage draining exit 2, discharge.In order further to strengthen filth-discharging effect, dull and stereotyped 16 upper ends extensions protrude from blowdown ditch the first side wall 22.Like this, flat board 16 can precipitate recirculated water for the second time with the space of the horizontal cooling tower base plane formation of blowdown ditch the first side wall 22 upper ends, dull and stereotyped 16 contact gaps that form with blowdown ditch the first side wall 22 upper ends enter into drain chamber 7 at current A from top intake antrum 17 by dirt contained in sewage and sediment and are brought into drain chamber 7 when interior, by sewage draining exit 2 and blow-off pipe 6, discharge; Meanwhile, the sewage B entering in intake antrum 8 can precipitate for the first time when entering drain chamber 7, has greatly improved filth-discharging effect.The same manner as in Example 2, can make gap occupying a narrow space close to sewage draining exit 2 by changing dull and stereotyped 16 methods that contact fracture surface roughness with blowdown ditch 1 bottom surface, the place away from sewage draining exit 2 is large.
In the utility model, comprise embodiment 1, embodiment 2 and embodiment 3, outer discharge pipe 4 can connect overflow pipe 20 by inverted U-shaped pipeline 19.The water flowing out during overflow is also the sewage of blowdown ditch 1 bottom, and unit overflow and blowdown combine, and can reduce water amount of blowdown.The valve 3 arranging on outer discharge pipe 4 adopts mud valve, can reduce the flow resistance of outer discharge pipe 4, and the mud valve of completely open and close can be brought into play the advantage of blowdown ditch 1 interior even blowdown better, can prevent that spool is by foreign material bite simultaneously.In the utility model, can be according to the continuous blowdown amount calculating, blow-off pipe 6 and sewage door in one group of embodiment 1 of the interior increase of blowdown ditch 1 are realized continuous blowdown, and blow-off pipe 6 calibers of setting up can be less than the caliber that blow-off pipe 6 has been set; Can also above blowdown ditch 1 current, add a solidifying wadding agent chemical feed pipe, realize cooling tower continuous blowdown.

Claims (10)

1. a cooling tower drainage, comprise the blowdown ditch that is arranged on below, cooling tower bottom, blowdown ditch end is provided with sewage draining exit, it is characterized in that: the interior bottom of described blowdown ditch is provided with separating device and blowdown ditch is divided into intake antrum and the drain chamber being connected, sewage draining exit and drain chamber conducting, sewage draining exit connects plant area's wastewater collection pipeline by valvular outer discharge pipe is set.
2. cooling tower drainage according to claim 1, is characterized in that: described separating device adopts the blow-off pipe that is arranged on top, blowdown ditch bottom surface, and blow-off pipe inner space is drain chamber, and blow-off pipe space outerpace is intake antrum; Blow-off pipe bottom axially offers several mudholes along blow-off pipe, and blow-off pipe is arranged in blowdown ditch, and one end of blow-off pipe is provided with cover plate, and the other end of blow-off pipe connects sewage draining exit; Cover plate is comprised of upper cover plate and lower cover, and upper cover plate is fixed on blow-off pipe end face, and lower cover and upper cover plate are hinged.
3. cooling tower drainage according to claim 2, is characterized in that: several described mudholes are equidistant evenly to be arranged, and the aperture of the mudhole far away apart from sewage draining exit is greater than the aperture of the mudhole nearer apart from sewage draining exit.
4. cooling tower drainage according to claim 2, is characterized in that: the aperture of several described mudholes is consistent, and the spacing of adjacent two mudholes far away apart from sewage draining exit is less than the spacing of adjacent two mudholes nearer apart from sewage draining exit.
5. according to the cooling tower drainage described in claim 3 or 4, it is characterized in that: described blow-off pipe top is provided with a plurality of openings, on opening, be provided with anti-floating device, described anti-floating device comprises flexure strip, flexure strip rear end is fixed on blow-off pipe tube wall upside, and the front end of flexure strip is fixed with the unidirectional mouthful of check catch for capping opening.
6. cooling tower drainage according to claim 5, is characterized in that: described top, blowdown ditch bottom surface is provided with two groups of blow-off pipes, and one end of two blow-off pipes connects respectively two sewage draining exits; Blowdown ditch top is provided with solidifying wadding agent chemical feed pipe.
7. cooling tower drainage according to claim 1, it is characterized in that: described separating device adopts the arc that is arranged on top, blowdown ditch bottom surface, the inner space of arc is drain chamber, and the space outerpace of arc is intake antrum, sewage draining exit and drain chamber conducting.
8. cooling tower drainage according to claim 1, it is characterized in that: described separating device adopts and is inclined at the flat board in blowdown ditch, the dull and stereotyped space forming with blowdown ditch bottom surface, blowdown ditch the first side wall is drain chamber, the dull and stereotyped space forming with blowdown ditch the second sidewall is intake antrum, sewage draining exit and drain chamber conducting.
9. cooling tower drainage according to claim 8, is characterized in that: described dull and stereotyped upper end extension protrudes from blowdown ditch the first side wall.
10. according to the cooling tower drainage described in any one in claim 1,2,3,4,6,7,8 or 9, it is characterized in that: described outer discharge pipe connects overflow pipe by inverted U-shaped pipeline.
CN201420064466.3U 2014-02-13 2014-02-13 Cooling tower blowdown system Expired - Lifetime CN203811020U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420064466.3U CN203811020U (en) 2014-02-13 2014-02-13 Cooling tower blowdown system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420064466.3U CN203811020U (en) 2014-02-13 2014-02-13 Cooling tower blowdown system

Publications (1)

Publication Number Publication Date
CN203811020U true CN203811020U (en) 2014-09-03

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Application Number Title Priority Date Filing Date
CN201420064466.3U Expired - Lifetime CN203811020U (en) 2014-02-13 2014-02-13 Cooling tower blowdown system

Country Status (1)

Country Link
CN (1) CN203811020U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103822530A (en) * 2014-02-13 2014-05-28 国家电网公司 Sewage discharging system of water cooling tower

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103822530A (en) * 2014-02-13 2014-05-28 国家电网公司 Sewage discharging system of water cooling tower

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C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20140903

Effective date of abandoning: 20160525

C25 Abandonment of patent right or utility model to avoid double patenting