CN109237991B - Circulating type power plant condenser online chemical cleaning method and system - Google Patents
Circulating type power plant condenser online chemical cleaning method and system Download PDFInfo
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- CN109237991B CN109237991B CN201811081504.5A CN201811081504A CN109237991B CN 109237991 B CN109237991 B CN 109237991B CN 201811081504 A CN201811081504 A CN 201811081504A CN 109237991 B CN109237991 B CN 109237991B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 78
- 239000000126 substance Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 21
- 239000007788 liquid Substances 0.000 claims abstract description 270
- 238000002347 injection Methods 0.000 claims abstract description 125
- 239000007924 injection Substances 0.000 claims abstract description 125
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- 238000007599 discharging Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 7
- 239000000243 solution Substances 0.000 abstract description 4
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 239000012459 cleaning agent Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 6
- 239000003245 coal Substances 0.000 description 4
- 238000001802 infusion Methods 0.000 description 4
- 239000000741 silica gel Substances 0.000 description 4
- 229910002027 silica gel Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012445 acidic reagent Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003619 algicide Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
A circulating type power plant condenser online chemical cleaning system comprises a liquid injection system and a liquid return system, wherein the liquid injection system comprises a liquid injection pump, a liquid injection electric valve and a liquid injection head; the liquid injection pump is positioned at the bottom of the liquid injection tank, the liquid injection pump is respectively connected with the constant pressure valve and the liquid injection electric valve through the damper, the constant pressure valve is connected with the recycling electric valve through a recycling pipeline, the recycling electric valve is connected with the liquid injection tank, the liquid injection electric valve is connected with one or more groups of liquid injection valves through liquid injection pipelines, each liquid injection valve is connected with the liquid injection head, the liquid injection heads inject cleaning liquid into corresponding heat exchange tubes, and the cleaning liquid in the heat exchange tubes flows into the liquid injection tank through the liquid return system; the liquid return system comprises a liquid return head and a liquid return electric valve, the liquid return head is connected with the liquid return valve, the liquid return valve is connected with the liquid return electric valve through a liquid return pipeline, and the liquid return electric valve is connected with the liquid injection tank. The invention provides the on-line chemical cleaning system for the condenser of the power plant, which has the advantages of cyclic use of cleaning solution, high automation degree, good descaling effect and zero emission.
Description
Technical Field
The invention belongs to the field of chemical cleaning of industrial heat exchangers, and particularly relates to an on-line chemical cleaning method and system for a condenser of a circulating power plant.
Background
The shell and tube water cooler is one of the main auxiliary devices widely used in the industrial departments of power, chemical industry, petroleum, atomic energy and the like, is responsible for the important cooling tasks of various power, electric, mechanical and chemical reaction devices, and has important influence on the safety and economic operation of enterprises due to the good and bad working performance. In the heat transfer process, the inner wall of the water side of a heat exchange tube in the tube type water cooler is easily subjected to the influence of heating and water quality to form scale and stain, the performance of the heat exchanger is adversely affected, and how to timely remove the scale and the stain is always an important problem to be solved urgently. Taking a power plant as an example: the condenser is a tube nest type water cooler: the steam-water-cooled steam-water condenser consists of thousands of heat exchange tubes, steam flows out of the tubes, cooling water flows in the tubes, and salt in the cooling water is continuously separated out in the continuous heating process due to the existence of heat exchange to form a large amount of scale and is attached to the tube walls, so that the vacuum in the condenser is reduced, the power generation coal consumption rate is increased, the power generation cost is increased, and the efficiency of the steam turbine generator unit is reduced. When the condenser is scaled by about 0.5mm, the vacuum degree can be reduced from more than 90% to less than 85%, the coal consumption for power generation is increased by 15-20 g/kW.h, for a 300MW unit which operates for 7000h per year and has a load rate of 90%, the standard coal consumption is increased by about 28-38 million t per year, and if the thickness of the water scale reaches 1mm, the coal consumption is increased by over 5 million tons per year, and the output of 10% is influenced. The vacuum in the condenser is reduced, the exhaust temperature of the steam turbine is increased, the deformation of the low-pressure cylinder is caused, the economical efficiency of the operation of a power plant is influenced, and the operation safety of a steam turbine generator unit is also directly influenced. The invention provides a technical system for realizing on-line chemical accurate cleaning of water scales and stains in a shell and tube water cooler by using a small amount of specific and specific chemical cleaning agents.
In the following, taking the condenser of the power plant as an example, the method of the present invention is compared with the same kind of on-line cleaning method commonly used in the power plant:
1) a method for cleaning rubber balls of condenser features that a lot of rubber balls are put in the water in condenser, which flows along with the circulating water and passes through the heat exchange tube of condenser to clean the heat exchange tube. In addition, the rubber ball cleaning method also depends on the flow velocity of circulating water, the temperature of the circulating water in winter is low, the flow cannot be large, otherwise, condensed water is generated to be overcooled, so that the running economy of a unit is reduced, the flow rate is reduced due to the reduction of the flow, the rubber ball cleaning effect is reduced, the cleaning rate of a condenser is reduced, and the minimum cleaning rate can reach 0.4 (the design value is 0.85). For a system adopting reclaimed water as circulating water, the effect is worse, so that how to use the rubber balls is a difficult problem which always troubles a power plant. Above CNK, a large number of articles about rubber ball improvement can be found to prove the rubber ball improvement, but the same problems can occur after the rubber ball is operated for a period of time after the rubber ball is improved, which indicates that the rubber ball cleaning has the major defects that the rubber ball cleaning depends on the flow rate of circulating water, and the ball receiving rate and the cleaning effect are difficult to achieve.
2) The on-line chemical cleaning method of the condenser comprises the following steps: at present, almost all power plants are added with a large amount of chemical cleaning agents (mainly acid, corrosion inhibitor and algaecide which are also added with a large amount of alkali for neutralizing and discharging) in a circulating water pool of a condenser on the basis of putting into rubber ball cleaning so as to prevent the scaling of a heat exchange pipe and the growth of algae. Along with the increase of the unit capacity, the quantity of circulating cooling water is larger and larger, the 300MW unit is about 40000t/h, the evaporation capacity of the circulating cooling water of the cooling tower is about 2600t/h, more units of 600MW and 1000MW are provided, in order to ensure the scale inhibition and sterilization effects and maintain the low PH value of the circulating cooling water, the dosing quantity is conceivable, taking the 300MW unit as an example, the dosing cost in one year is about 200 ten thousand yuan. Nevertheless, the effect is not obvious for the unit that adopts reclaimed water (the state has a regulation that the circulating water of the power plant must adopt reclaimed water to avoid adopting underground water) as the circulating cooling water of the power plant, and the unit has to be temporarily stopped and cleaned during the operation period due to serious scaling so as to ensure the operation safety of the unit.
The main problems of this cleaning method are: the added chemical cleaning agent is diluted by a large amount of circulating water in the circulating water tank, and far away from the cleaning concentration when reaching the heat exchange tube of the condenser, so that a large amount of chemical cleaning agent is wasted.
Disclosure of Invention
According to the defects of the prior art, the on-line chemical cleaning method and the system for the power plant condenser are provided, wherein the cleaning solution is recycled, the automation degree is high, the descaling effect is good, and zero emission can be realized.
The invention is realized according to the following technical scheme:
a circulating type on-line chemical cleaning method for a condenser of a power plant comprises the following steps:
the method comprises the following steps: the cleaning liquid in the liquid injection tank reaches a preset liquid level;
step two: starting the liquid injection pump and starting the recirculation electric valve;
step three: the underwater robot at the front water chamber of the condenser moves to a specified position, a liquid injection head on the underwater robot advances to the orifice of the heat exchange tube, and the orifice of the heat exchange tube is sealed;
step four: opening the liquid injection electric valve, injecting liquid until the heat exchange tube is filled with cleaning liquid, and closing the liquid injection electric valve;
step five: the underwater robot at the rear water chamber of the condenser acts to position the liquid return head to the pipe orifice of the heat exchange pipe, seal the pipe orifice of the heat exchange pipe, open the liquid injection electric valve and the liquid return electric valve at the same time, and start to circularly clean until the cleaning task is finished;
step six: closing the liquid injection electric valve, enabling the underwater robot discharged from the front water chamber to act, enabling the liquid injection head to be separated from the pipe orifice of the heat exchange pipe, discharging the cleaning residual liquid in the heat exchange pipe into the liquid return injection head by utilizing the internal pressure of the condenser, discharging the cleaning residual liquid into the liquid return tank through a liquid return pipeline, enabling the residual liquid in the heat exchange pipe to be completely discharged when the liquid level of the liquid injection tank rises due to the rise of the liquid return liquid level and reaches a preset value, and closing the liquid return electric valve at;
step seven: the underwater robot at the rear water chamber acts, the liquid return head is separated from the pipe orifice of the heat exchange pipe, and next positioning action is prepared;
step eight: and repeating the above actions to complete the cleaning work of all the condensers.
Preferably, in the fourth step, whether the heat exchange pipe is filled with the cleaning liquid is determined by metering through a liquid level meter on the liquid injection tank.
Preferably, in the fifth step, the reading on the PH meter of the liquid injection pipe is the same as the reading on the PH meter of the liquid return pipe, and the cleaning task is completed.
A circulating type power plant condenser online chemical cleaning system comprises a liquid injection tank, a liquid injection system and a liquid return system, wherein the liquid injection system comprises a liquid injection pump, a liquid injection electric valve and a liquid injection head; the liquid injection pump is positioned at the bottom of the liquid injection tank, the liquid injection pump is respectively connected with the constant pressure valve and the liquid injection electric valve through the damper, the constant pressure valve is connected with the recycling electric valve through a recycling pipeline, the recycling electric valve is connected with the liquid injection tank, the liquid injection electric valve is connected with one or more groups of liquid injection valves through liquid injection pipelines, each liquid injection valve is also connected with the liquid injection head, the liquid injection heads inject cleaning liquid into corresponding heat exchange tubes, and the cleaning liquid in the heat exchange tubes flows into the liquid injection tank through the liquid return system; the liquid return system comprises a liquid return head and a liquid return electric valve, the liquid return head is connected with the liquid return valve, the liquid return valve is connected with the liquid return electric valve through a liquid return pipeline, and the liquid return electric valve is connected with the liquid injection tank.
Preferably, the inlet end of the infusion pump is connected with a filter.
Preferably, the outlet end of the liquid injection electric valve is connected with a liquid injection pipe PH instrument; and the inlet end of the liquid return electric valve is connected with a liquid return pipe PH instrument.
Preferably, a liquid level meter is arranged on the liquid injection tank.
Preferably, the lower part of the liquid injection tank is provided with a residual liquid cleaning pipe.
Preferably, a clear water inlet pipe is arranged on the liquid injection tank.
Preferably, the liquid injection head is the same as the liquid return head; annotate the liquid head and include the lower plate, the lower plate is connected with the upper plate through the bed plate frame, the cylinder is installed to one side of upper plate, the cylinder is connected with the cylinder adapter, bulb of front end fixedly connected with of telescopic shaft in the cylinder, the bulb passes through the horizon bar and links to each other with the push pedal, the push pedal is connected with the slider again, be provided with the guide rail below the slider, realize the movement track of slider through the location of guide rail, alternate in the slider have one in the middle of wide both sides narrow, and can be at the gliding axle that fills in the slider, be located the epaxial cover of filling in the slider and be equipped with elastomeric element, elastomeric element one end is supported and is being filled a broadside position, and the rear opening part at the slider is supported to one end, the rear end that fills the axle is fixed with the nut that.
The method forms local sealing on part (dozens or hundreds) of steam device heat exchange tubes under the condition that the power plant does not shut down, completes the circular cleaning, and has the advantages that:
1. the cleaning speed is improved, the waiting time of liquid injection and return during single-side cleaning is avoided, and the cleaning speed can be improved by about one time;
2. the cleaning effect can be detected conveniently and timely, when the concentration or the PH value of the circulating cleaning solution is detected to be not reduced any more on line, the circulating cleaning is stopped, excessive cleaning and manual sampling are avoided, and the functions of automatic dosing, automatic liquid preparation, automatic cleaning and the like of a computer can be realized;
3. the dosage of the cleaning agent is greatly saved, the cyclic utilization of the cleaning agent is realized, and the cleaning cost is reduced;
4. the leakage of cleaning liquid is effectively avoided, and particularly, the cooling system with strict requirements on water quality, such as an open system, is more favorable, and zero emission can be realized;
5. the method realizes the on-line chemical cleaning of the condenser of the power plant.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a plan view of the liquid injection head;
FIG. 3 is a front view of the injection head;
FIG. 4 is a side view of the injection head;
1-upper base plate, 2-pouring shaft, 3-sliding membrane, 4-guide rail, 5-cylinder, 6-cylinder adapter, 7-lower base plate, 8-ball head, 9-push plate, 10-silica gel sleeve, 11-elastic component, 12-slide block, 13-nut, 14-base plate frame;
20-liquid injection tank, 21-liquid level meter, 22-residual liquid cleaning pipe, 23-clear water inlet pipe and 24-overflow pipe;
30-a liquid injection pipe PH instrument, 31-a liquid injection pump, 32-a liquid injection electric valve, 33-a filter, 34-a damper, 35-a constant pressure valve, 36-a liquid injection valve and 37-a recycling electric valve;
40-liquid return pipe PH instrument, 41-liquid return electric valve, 42-liquid return valve;
100-liquid injection head, 200-liquid return head and 300-heat exchange tube.
Detailed Description
The invention is further described by the following specific embodiments with reference to the attached drawings.
As shown in fig. 1 to 4, an online chemical cleaning system for a circulating power plant condenser comprises a liquid injection tank 20, a liquid injection system and a liquid return system, wherein a liquid level meter 21 is installed on the liquid injection tank 20, a residual liquid cleaning pipe 22 is arranged at the lower part of the liquid injection tank 20, and a clear water inlet pipe 23 and an overflow pipe 24 are arranged on the liquid injection tank 20.
The liquid injection system comprises a liquid injection pump 31, a liquid injection electric valve 32 and a liquid injection head 100; infusion pump 31 is located annotate liquid jar 20 bottom, infusion pump 31's entry end is connected with filter 33, infusion pump 31 passes through attenuator 34 and links to each other with constant pressure valve 35 and notes liquid motorised valve 32 respectively, constant pressure valve 35 links to each other with recirculation motorised valve 37 through the recirculation pipeline, recirculation motorised valve 37 links to each other with annotating liquid jar 20, it links to each other with a set of or multiunit notes liquid valve 36 through annotating the liquid pipeline to annotate liquid motorised valve 32, each notes liquid valve 36 links to each other with annotating liquid head 100 again, annotate liquid head 100 and pour into corresponding heat exchange tube 300 with the washing liquid into, the washing liquid in the heat exchange tube 300 flows into annotates liquid jar 20 through liquid return system in, the exit end of.
The damper 34 and the constant pressure valve 35 are used for establishing a recirculation pipeline to avoid frequent starting of the water pump;
b. water hammer is prevented, and the pipeline is protected; c. the injection pressure is maintained constant. The working principle is that the damper 34 is provided with an air bag which can absorb water hammer caused by the sudden closing of the electromagnetic valve; the constant pressure valve 35 has a spring, and can automatically adjust the opening of the valve according to the change of the water pressure.
The liquid return system comprises a liquid return head 200 and a liquid return electric valve 41, the liquid return head 200 is connected with a liquid return valve 42, the liquid return valve 42 is connected with the liquid return electric valve 41 through a liquid return pipeline, the liquid return electric valve 41 is connected with the liquid injection tank 20, and the inlet end of the liquid return electric valve 41 is connected with a liquid return pipe PH instrument 40.
The liquid injection head 100 is the same as the liquid return head 200; the liquid injection head 100 comprises a lower bottom plate 7, the lower bottom plate 7 is connected with an upper bottom plate 1 through a bottom plate frame 14, one side of the upper bottom plate 1 is provided with a cylinder 5, the cylinder 5 is connected with a cylinder adapter 6, the front end of a telescopic shaft in the cylinder 5 is fixedly connected with a ball head 8, the ball head 8 is connected with a push plate 9 through a horizontal rod, the push plate 9 is connected with a slide block 12, a guide rail 4 is arranged below the slide block 12, a sliding membrane 3 is arranged on the guide rail 4, the movement track of the sliding block 12 is realized through the positioning of the guide rail 4, a pouring shaft 2 which is wide in the middle and narrow in two sides and can slide in the sliding block 12 is inserted in the sliding block 12, an elastic part 11 is sleeved on the pouring shaft 2 positioned in the sliding block 12, one end of the elastic part 11 is propped against the wide side part of the pouring shaft 2, the other end of the elastic part is propped against the rear opening of the sliding block 12, and a nut 13 with the outer diameter larger than the inner diameter of the rear opening of the sliding block 12 is fixed at the rear end of the pouring shaft; the front end of the filling shaft 2 is sleeved with a silica gel sleeve 10, and after the cylinder 5 contracts and moves to the next heat exchange tube 300, the filling shaft 2 automatically props against the heat exchange tube opening forwards by means of the elasticity of the elastic part 11.
The elastic member 11 is a spring. Because the condenser is in a high-temperature environment, the injected chemical reagent is also an acid reagent, and the titanium alloy has the characteristics of high strength, good corrosion resistance, high heat resistance and the like, the compression spring is made of the titanium alloy.
The working process of the liquid injection head 100 is as follows:
the cylinder 5 advances to drive the push plate 9 to advance, the push plate 9 drives the slide block 12 to advance, so that the silica gel sleeve 10 at the front end of the filling shaft 2 abuts against the heat exchange pipe orifice, when the cylinder 5 continues to advance, the push plate 9 is driven to continue to advance, the slide block 12 is driven to continue to advance by the push plate 9, at the moment, the slide block 12 compresses the spring, the spring can further compress the silica gel sleeve 10 to carry out sealing butt joint on the heat exchange pipe, a cleaning solution is pumped out from the external liquid distribution device to the filling shaft 2, the filling shaft 2 fills the cleaning agent into the heat exchange pipe 300, after the set cleaning soaking time is reached, the cylinder 5 is retracted, the filling shaft 2 is withdrawn, and then the next heat exchange.
A circulating type on-line chemical cleaning method for a condenser of a power plant comprises the following steps:
the method comprises the following steps: the cleaning liquid in the liquid injection tank 20 reaches a preset liquid level;
step two: starting the liquid injection pump 31 and opening the recirculation electric valve 37;
step three: the underwater robot at the front water chamber of the condenser moves to a designated position, the liquid injection head 100 on the underwater robot advances to the orifice of the heat exchange tube 300, and the orifice of the heat exchange tube 300 is sealed;
step four: starting the liquid injection electric valve 32, metering by the liquid level meter 21 on the liquid injection tank 20, injecting liquid until the heat exchange tube 300 is filled with cleaning liquid (emptying circulating water in the heat exchange tube 300), and closing the liquid injection electric valve 32;
step five: the underwater robot at the rear water chamber of the condenser acts to position the liquid return head 200 to the orifice of the heat exchange tube 300, seal the orifice of the heat exchange tube 300, open the liquid injection electric valve 32 and the liquid return electric valve 41 at the same time, start to circularly clean, and finish the cleaning task when the reading on the liquid injection tube PH instrument 30 is the same as the reading on the liquid return tube PH instrument 40;
step six: closing the liquid injection electric valve 32, enabling the underwater robot discharged from the front water chamber to act, enabling the liquid injection head 100 to be separated from the pipe orifice of the heat exchange pipe 300, discharging the cleaning residual liquid in the heat exchange pipe 300 into the liquid return head 200 by utilizing the internal pressure (about 0.26 Mpa) of the condenser, discharging the cleaning residual liquid into the liquid return tank 20 through a liquid return pipeline, enabling the residual liquid in the heat exchange pipe 300 to be completely discharged when the liquid level of the liquid return tank 20 rises due to the rise of the liquid return liquid level and reaches a preset value, and closing the liquid return electric valve;
step seven: the underwater robot at the rear water chamber acts, the liquid return head 200 is separated from the pipe orifice of the heat exchange pipe 300, and next positioning action is prepared;
step eight: and repeating the above actions to complete the cleaning work of all the condensers.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, so that any person skilled in the art can make modifications or changes in the technical content disclosed above, and equivalent embodiments can be obtained. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are still within the protection scope of the present invention, unless they depart from the technical spirit of the present invention.
Claims (2)
1. The utility model provides a circulating power plant condenser online chemical cleaning system, includes annotate liquid jar (20), annotates liquid system and return liquid system, its characterized in that: the liquid injection system comprises a liquid injection pump (31), a liquid injection electric valve (32) and a liquid injection head (100); the liquid injection pump (31) is positioned at the bottom of the liquid injection tank (20), the liquid injection pump (31) is respectively connected with a constant pressure valve (35) and a liquid injection electric valve (32) through a damper (34), the constant pressure valve (35) is connected with a recirculation electric valve (37) through a recirculation pipeline, the recirculation electric valve (37) is connected with the liquid injection tank (20), the liquid injection electric valve (32) is connected with one or more groups of liquid injection valves (36) through a liquid injection pipeline, each liquid injection valve (36) is connected with a liquid injection head (100), the liquid injection head (100) injects cleaning liquid into a corresponding heat exchange pipe (300), and the cleaning liquid in the heat exchange pipe (300) flows into the liquid injection tank (20) through a liquid injection system;
the liquid return system comprises a liquid return head (200) and a liquid return electric valve (41), the liquid return head (200) is connected with a liquid return valve (42), the liquid return valve (42) is connected with the liquid return electric valve (41) through a liquid return pipeline, and the liquid return electric valve (41) is connected with the liquid injection tank (20);
the inlet end of the liquid injection pump (31) is connected with a filter (33);
the outlet end of the liquid injection electric valve (32) is connected with a liquid injection pipe PH instrument (30); the inlet end of the liquid return electric valve (41) is connected with a liquid return pipe PH instrument (40);
a liquid level meter (21) is arranged on the liquid injection tank (20);
a residual liquid cleaning pipe (22) is arranged at the lower part of the liquid injection tank (20);
a clear water inlet pipe (23) is arranged on the liquid injection tank (20);
the liquid injection head (100) is the same as the liquid return head (200); annotate liquid head (100) and include bottom plate (7), bottom plate (7) are connected with upper plate (1) through bottom plate frame (14), cylinder (5) are installed to one side of upper plate (1), cylinder (5) are connected with cylinder adapter (6), the front end fixedly connected with bulb (8) of telescopic shaft in cylinder (5), bulb (8) link to each other with push pedal (9) through the horizon bar, push pedal (9) are connected with slider (12) again, be provided with guide rail (4) below slider (12), realize the movement track of slider (12) through the location of guide rail (4), it has one in the middle of the interlude wide both sides narrow, and can be in slider (12) gliding axle (2) of pouring, the cover is equipped with elastomeric element (11) on the axle (2) of pouring that is located slider (12), one end of the elastic component (11) is abutted to the wide side of the filling shaft (2), one end of the elastic component is abutted to the rear opening of the sliding block (12), and a nut (13) with the outer diameter larger than the inner diameter of the rear opening of the sliding block (12) is fixed to the rear end of the filling shaft (2).
2. A cleaning method of a circulating type power plant condenser online chemical cleaning system based on claim 1 is characterized in that: the cleaning method comprises the following steps:
the method comprises the following steps: the cleaning liquid in the liquid injection tank reaches a preset liquid level;
step two: starting the liquid injection pump and starting the recirculation electric valve;
step three: the underwater robot at the condenser water inlet chamber moves to a designated position, and a liquid injection head on the underwater robot advances to the pipe orifice of the heat exchange pipe and seals the pipe orifice of the heat exchange pipe;
step four: opening the liquid injection electric valve, injecting liquid until the heat exchange tube is filled with cleaning liquid, and closing the liquid injection electric valve;
step five: an underwater robot at the position of a condenser water return chamber acts to position a liquid return head to the pipe orifice of the heat exchange pipe, seal the pipe orifice of the heat exchange pipe, open an electric liquid injection valve and an electric liquid return valve at the same time, and start circulating cleaning until a cleaning task is finished;
step six: closing the liquid injection electric valve, enabling the underwater robot at the water inlet chamber to act, enabling the liquid injection head to be separated from the pipe orifice of the heat exchange pipe, discharging the cleaning residual liquid in the heat exchange pipe into the liquid return head by utilizing the internal pressure of the condenser, discharging the cleaning residual liquid into the liquid return tank through the liquid return pipeline, enabling the liquid level of the liquid injection tank to rise due to the liquid return level, when the liquid return level reaches a preset value, discharging the residual liquid in the heat exchange pipe completely, and then closing the liquid return electric valve;
step seven: the underwater robot at the water return chamber acts, and a liquid return head is separated from the pipe orifice of the heat exchange pipe to prepare for the next positioning action;
step eight: repeating the above actions to complete the cleaning work of all the condensers;
in the fourth step, whether the heat exchange pipe is filled with the cleaning liquid or not is determined by metering by a liquid level meter on the liquid injection tank;
and in the fifth step, when the reading on the PH meter of the liquid injection pipe is the same as the reading on the PH meter of the liquid return pipe, the cleaning task is completed.
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| CN201811081504.5A CN109237991B (en) | 2018-09-17 | 2018-09-17 | Circulating type power plant condenser online chemical cleaning method and system |
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| CN201811081504.5A CN109237991B (en) | 2018-09-17 | 2018-09-17 | Circulating type power plant condenser online chemical cleaning method and system |
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| CN109237991B true CN109237991B (en) | 2020-08-04 |
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| JP2886449B2 (en) * | 1994-05-02 | 1999-04-26 | 晃栄化学工業株式会社 | Heat exchanger tube cleaning method |
| CN104251644B (en) * | 2014-09-24 | 2016-09-07 | 徐州比此智能科技有限公司 | A kind of industry shell and tube water cooler online precise chemical structure descaling device and method |
| CN104949571B (en) * | 2015-06-17 | 2018-06-26 | 彭伟 | Zero-emission online accurate chemical cleaning method and device for tube heat exchanger |
| CN205926453U (en) * | 2016-08-01 | 2017-02-08 | 上海蓝昌环境工程有限公司 | Chemical cleaning equipment |
| CN108105114A (en) * | 2017-12-27 | 2018-06-01 | 合肥新沪屏蔽泵有限公司 | A kind of backwash type canned motor pump with metering pump for pumping the medium containing particulate matter |
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