CN109269344B - Online chemical cleaning liquid preparation system - Google Patents
Online chemical cleaning liquid preparation system Download PDFInfo
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- CN109269344B CN109269344B CN201811080686.4A CN201811080686A CN109269344B CN 109269344 B CN109269344 B CN 109269344B CN 201811080686 A CN201811080686 A CN 201811080686A CN 109269344 B CN109269344 B CN 109269344B
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- 239000007788 liquid Substances 0.000 title claims abstract description 226
- 238000004140 cleaning Methods 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 38
- 239000000126 substance Substances 0.000 title claims abstract description 28
- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 19
- 238000009826 distribution Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 230000008859 change Effects 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 239000012459 cleaning agent Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 7
- 239000003245 coal Substances 0.000 description 4
- 230000006872 improvement Effects 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
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 239000002253 acid 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
Images
Classifications
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- 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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- 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
- F28G15/00—Details
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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
An online chemical cleaning liquid preparation system comprises three tank bodies, wherein a liquid preparation tank pumps a reagent in the liquid preparation tank into a liquid injection tank through a liquid guide pump, and the bottom of the liquid injection tank is connected with a liquid pump through a filter; the liquid pump is connected with two or four groups of liquid inlet valve groups, each group of liquid inlet valve group is connected with a plurality of liquid changing pipe valve groups, the liquid changing pipe valve groups are connected with a scale remover injection device on the robot, the scale remover injection device injects reagents into corresponding heat exchange pipes, the soaked reagents flow into the liquid returning tank through the liquid returning valve group by the pressure in the condenser, the liquid returning tank is also provided with a liquid returning pump, and the liquid returning pump pumps the reagents in the liquid returning tank into the liquid distribution tank; still include attenuator and constant pressure valve, the attenuator is connected with the drawing liquid pump, and the one end of constant pressure valve links to each other with the liquid outlet of drawing liquid pump, and the other end links to each other with annotating the liquid and irritate the bottom. The invention provides an on-line chemical cleaning liquid preparation system which is simple in structure, novel in design, small in cleaning agent consumption and good in descaling effect.
Description
Technical Field
The invention belongs to the field of chemical cleaning of industrial heat exchangers, and particularly relates to an online chemical cleaning liquid preparation system.
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 p H 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 liquid preparation system is simple in structure, novel in design, small in cleaning agent consumption and good in descaling effect.
The invention is realized according to the following technical scheme:
an on-line chemical cleaning liquid preparation system comprises three tank bodies, namely a liquid preparation tank, a liquid injection tank and a liquid return tank, wherein the liquid preparation tank pumps a reagent in the liquid preparation tank into the liquid injection tank through a liquid guide pump, and the bottom of the liquid injection tank is connected with a liquid pump through a filter; the liquid pump is connected with two or four groups of liquid inlet valve groups, each group of liquid inlet valve group is connected with a plurality of liquid changing pipe valve groups, the liquid changing pipe valve groups are connected with a scale remover injection device on the robot, the scale remover injection device injects reagents into corresponding heat exchange pipes, the soaked reagents flow into the liquid returning tank through the liquid returning valve groups by the pressure in the condenser, the liquid returning tank is also provided with a liquid returning pump, and the liquid returning pump pumps the reagents in the liquid returning tank into the liquid distribution tank; still include attenuator and constant pressure valve, the attenuator is connected with the drawing liquid pump, the one end of constant pressure valve links to each other with the liquid outlet of drawing liquid pump, and the other end links to each other with the notes liquid bottom of irritating.
Preferably, the liquid inlet valve group consists of a liquid inlet manual valve I, a liquid inlet electric ball valve and a liquid inlet manual valve II which are connected in sequence; the liquid return valve group consists of a liquid return manual valve I, a liquid return electric ball valve and a liquid return manual valve II which are sequentially connected; the liquid change pipe valve group is composed of a liquid change pipe manual valve I, a sampling valve, a liquid change pipe electric ball valve, a flowmeter, a liquid change pipe manual valve II and a liquid change pipe manual valve III which are sequentially connected.
Preferably, the liquid preparation tank, the liquid injection tank and the liquid return tank are respectively provided with a liquid level meter.
Preferably, an p H tester is arranged in the liquid return tank.
Preferably, the liquid injection tank and the liquid return tank are respectively provided with an overflow pipe.
Preferably, the liquid injection tank and the liquid return tank are respectively provided with a residual liquid cleaning pipe.
Preferably, a clear water inlet pipe is arranged on the liquid preparation tank.
Preferably, the liquid inlet and the liquid outlet of the liquid pump are respectively connected in series with a manual liquid outlet valve.
The invention is used as one of main auxiliary equipment of an industrial tubular heat exchanger on-line chemical cleaning robot, is determined by on-site practical application and optimization after improvement, and has the following beneficial effects:
1. the continuous supply of the cleaning liquid is ensured;
2. the p H values of the cleaning liquid and the return liquid are automatically detected, so that automatic liquid preparation and automatic recovery of cleaning residual liquid are realized, and the cleaning liquid is recycled; the automation degree is high;
3. the ultrasonic liquid level meter can accurately measure the liquid level changes of the liquid injection tank, the liquid distribution tank and the liquid return tank, and provides reliable signals for computer control;
4. each liquid injection pipe is provided with a flowmeter, so that the liquid injection amount and the liquid return amount of each heat exchange pipe during cleaning can be accurately controlled, the cleaning effect is ensured, and the water quality pollution is avoided;
5. the structure adopts the modularized design, only has one supply and one return main pipelines, the construction is simpler, the arrangement is compact, and the occupied field is saved.
In a word, the invention is an on-line chemical cleaning liquid preparation system which has novel design, simplified structural module, capability of recycling cleaning agent, high automation degree and good descaling effect.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of an on-line chemical cleaning solution preparation system according to the present invention;
fig. 2 is a partially enlarged view of the on-line chemical cleaning solution preparation system shown in fig. 1.
Detailed Description
The present invention will be further described with reference to fig. 1 and 2.
The first embodiment is as follows:
an on-line chemical cleaning liquid preparation system comprises three tank bodies, namely a liquid preparation tank 1, a liquid injection tank 2 and a liquid return tank 3, wherein the liquid preparation tank 1 is provided with a clear water inlet pipe 17 and a liquid adding port, the liquid injection tank 2 and the liquid return tank 3 are respectively provided with an observation window, the liquid preparation tank 1 pumps a reagent in the liquid preparation tank 1 into the liquid injection tank 2 through a liquid guide pump 4, the bottom of the liquid injection tank 2 is connected with a liquid suction pump 6 through a filter 5, and a liquid inlet and a liquid outlet of the liquid suction pump 6 are respectively connected in series with a liquid outlet manual valve 6-1; the liquid pump 6 is connected with two or four groups of liquid inlet valve groups 7, each group of liquid inlet valve groups 7 is connected with eight liquid change pipe valve groups 9, the liquid change pipe valve groups 9 are connected with a scale remover injection device on the robot 100, the scale remover injection device injects reagents into corresponding heat exchange pipes, the soaked reagents flow into the liquid return tank 3 through the liquid return valve group 8 by virtue of the pressure in the condenser, the liquid return tank 3 is also provided with a liquid return pump 10, and the liquid return pump 10 pumps the reagents in the liquid return tank 3 into the liquid distribution tank 1.
The liquid inlet valve group 7 consists of a liquid inlet manual valve I7-1, a liquid inlet electric ball valve 7-2 and a liquid inlet manual valve II 7-3 which are connected in sequence; the liquid return valve group 8 consists of a liquid return manual valve I8-1, a liquid return electric ball valve 8-2 and a liquid return manual valve II 8-3 which are connected in sequence; the liquid changing pipe valve group 9 consists of a liquid changing pipe manual valve I9-1, a sampling valve 9-2, a liquid changing pipe electric ball valve 9-3, a flow meter 9-4, a liquid changing pipe manual valve II 9-5 and a liquid changing pipe manual valve III 9-6 which are connected in sequence, and the two manual valves are arranged up and down to achieve the effect of being mainly convenient to overhaul.
Still include attenuator 11 and constant pressure valve 12, attenuator 11 is connected with drawing liquid pump 6, and the one end of constant pressure valve 12 links to each other with the liquid outlet of drawing liquid pump 6, and the other end links to each other with annotating the liquid and irritating 2 bottoms. The damper 11 and the constant pressure valve 12 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 11 is provided with an air bag which can absorb water hammer caused by the sudden closing of the electromagnetic valve; the constant pressure valve 12 is provided with a spring and can automatically adjust the opening of the valve according to the change of water pressure.
Example two:
on the basis of the first embodiment, the liquid preparation tank 1, the liquid injection tank 2 and the liquid return tank 3 are respectively provided with a liquid level meter 13. The reflow tank 3 is provided with an p H tester 14. The injection tank 2 and the liquid return tank 3 are respectively provided with an overflow pipe 15. And the injection tank 2 and the liquid return tank 3 are respectively provided with a residual liquid cleaning pipe 16.
The working process is as follows:
starting a liquid guide pump 4, pumping the reagent prepared in a liquid preparation tank 1 into a liquid injection tank 2 by the liquid guide pump 4, starting a liquid suction pump 6, injecting the pumped reagent into a scale remover injection device on the robot 100 by the liquid suction pump 6 through a plurality of liquid exchange tube valve groups 9, butting a scale remover injection nozzle and a heat exchange tube port in the scale remover injection device, sealing the heat exchange tube port, and avoiding cooling water from entering and medicament from leaking out, then supplying a cleaning agent to the scale remover injection nozzle by the scale remover liquid preparation device, and supplying the cleaning agent into a heat exchange tube of a cooler by the scale remover injection nozzle for chemical cleaning and soaking; after the set cleaning soaking time is reached, the residual cleaning liquid soaked in the heat exchange tube can be completely returned to the liquid return tank 3 by the pressure in the condenser, the liquid return pump 10 can be started if the acidity is still within the preset range through the determination of the p H tester 14, and the reagent in the liquid return tank 3 is pumped into the liquid preparation tank 1 by the liquid return pump 10 to be continuously recycled.
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 (7)
1. The utility model provides an online chemical cleaning joins in marriage liquid system which characterized in that: the device comprises three tank bodies, namely a liquid preparation tank (1), a liquid injection tank (2) and a liquid return tank (3), wherein a reagent in the liquid preparation tank (1) is pumped into the liquid injection tank (2) by the liquid guide pump (4) through the liquid preparation tank (1), and the bottom of the liquid injection tank (2) is connected with a liquid pump (6) through a filter (5);
the liquid pump (6) is connected with two or four groups of liquid inlet valve groups (7), each group of liquid inlet valve group (7) is connected with a plurality of liquid change pipe valve groups (9), the liquid change pipe valve groups (9) are connected with a scale remover injection device on the robot (100), the scale remover injection device injects reagents into corresponding heat exchange pipes, the soaked reagents flow into the liquid return tank (3) through a liquid return valve group (8) by virtue of the pressure in a condenser, a liquid return pump (10) is further arranged on the liquid return tank (3), and the liquid return pump (10) pumps the reagents in the liquid return tank (3) into the liquid distribution tank (1);
the constant-pressure liquid filling device is characterized by further comprising a damper (11) and a constant-pressure valve (12), wherein the damper (11) is connected with the liquid pump (6), one end of the constant-pressure valve (12) is connected with a liquid outlet of the liquid pump (6), and the other end of the constant-pressure valve is connected with the bottom of the liquid filling tank (2);
the liquid inlet valve group (7) consists of a liquid inlet manual valve I (7-1), a liquid inlet electric ball valve (7-2) and a liquid inlet manual valve II (7-3) which are connected in sequence;
the liquid return valve group (8) consists of a liquid return manual valve I (8-1), a liquid return electric ball valve (8-2) and a liquid return manual valve II (8-3) which are connected in sequence;
the liquid changing pipe valve group (9) is composed of a liquid changing pipe manual valve I (9-1), a sampling valve (9-2), a liquid changing pipe electric ball valve (9-3), a flow meter (9-4), a liquid changing pipe manual valve II (9-5) and a liquid changing pipe manual valve III (9-6) which are sequentially connected.
2. The on-line chemical cleaning liquid preparation system according to claim 1, characterized in that: the liquid preparation tank (1), the liquid injection tank (2) and the liquid return tank (3) are respectively provided with a liquid level meter (13).
3. The on-line chemical cleaning liquid preparation system according to claim 1, characterized in that: an p H tester (14) is arranged in the liquid returning tank (3).
4. The on-line chemical cleaning liquid preparation system according to claim 1, characterized in that: and overflow pipes (15) are respectively arranged on the liquid injection tank (2) and the liquid return tank (3).
5. The on-line chemical cleaning liquid preparation system according to claim 1, characterized in that: and residual liquid cleaning pipes (16) are respectively arranged on the liquid injection tank (2) and the liquid return tank (3).
6. The on-line chemical cleaning liquid preparation system according to claim 1, characterized in that: and a clear water inlet pipe (17) is arranged on the liquid preparation tank (1).
7. The on-line chemical cleaning liquid preparation system according to claim 1, characterized in that: the liquid inlet and the liquid outlet of the liquid pump (6) are respectively connected in series with a manual liquid outlet valve (6-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811080686.4A CN109269344B (en) | 2018-09-17 | 2018-09-17 | Online chemical cleaning liquid preparation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811080686.4A CN109269344B (en) | 2018-09-17 | 2018-09-17 | Online chemical cleaning liquid preparation system |
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| CN109269344A CN109269344A (en) | 2019-01-25 |
| CN109269344B true CN109269344B (en) | 2020-03-10 |
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| CN201811080686.4A Active CN109269344B (en) | 2018-09-17 | 2018-09-17 | Online chemical cleaning liquid preparation system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111102875A (en) * | 2019-12-05 | 2020-05-05 | 山西太钢不锈钢股份有限公司 | Cleaning formula and cleaning method for air cooler |
| CN111256516A (en) * | 2019-12-24 | 2020-06-09 | 常熟浦发第二热电能源有限公司 | Online cleaning method for open-type circulating condenser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001116408A (en) * | 1999-10-18 | 2001-04-27 | Taiji Kurokawa | Cleaning device for refrigerating cycle |
| CN103322851B (en) * | 2013-05-30 | 2018-04-17 | 安徽五瑞洁能科技有限公司 | A kind of condenser on-line in-parallel cleaning robot of thermal power plant |
| CN204329716U (en) * | 2014-12-12 | 2015-05-13 | 山东龙力生物科技股份有限公司 | A kind of heat exchanger circulation apparatus for eliminating sludge |
| CN104949571B (en) * | 2015-06-17 | 2018-06-26 | 彭伟 | Zero-emission online accurate chemical cleaning method and device for tube heat exchanger |
| CN106861485A (en) * | 2017-03-03 | 2017-06-20 | 吉姆西半导体科技（无锡）有限公司 | Chemical liquid feed system and supply method |
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