CN1057945C - Method and device for descaling ash removal pipeline of power plant - Google Patents
Method and device for descaling ash removal pipeline of power plant Download PDFInfo
- Publication number
- CN1057945C CN1057945C CN95110474A CN95110474A CN1057945C CN 1057945 C CN1057945 C CN 1057945C CN 95110474 A CN95110474 A CN 95110474A CN 95110474 A CN95110474 A CN 95110474A CN 1057945 C CN1057945 C CN 1057945C
- Authority
- CN
- China
- Prior art keywords
- ash removal
- spent acid
- pipeline
- removal pipe
- pond
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000002253 acid Substances 0.000 claims abstract description 38
- 239000002699 waste material Substances 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004020 conductor Substances 0.000 claims abstract description 6
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000009413 insulation Methods 0.000 claims description 11
- 230000001012 protector Effects 0.000 claims description 10
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 239000012266 salt solution Substances 0.000 claims description 3
- 239000012267 brine Substances 0.000 claims description 2
- 230000004941 influx Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 description 1
- 229910000020 calcium bicarbonate Inorganic materials 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 235000019600 saltiness Nutrition 0.000 description 1
- 210000000952 spleen Anatomy 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The descaling method for ash-removing pipeline of power plant is characterized by that the interior of the pipeline is washed by acid, at the same time, it is protected by cathode protection device to make the pipeline be protected from corrosion and wear, and the provided cathode protection device is formed from insulating conducting ring, D.C. power supply and positive and negative conductors, the insulating conducting ring is mounted on the ash-removing pipeline, and is formed from graphite ring and external ceramic ring, on the graphite ring a binding post is connected, and the binding post is connected with positive conductor, and the ash-removing pipeline is connected with negative conductor, and the waste acid provided by anode bed of boiler water-supplying system of its technological process can be used in the pipeline, and the boiler water-supplying system can be slightly improved.
Description
The present invention relates to a kind of method of descaling of ash removal pipe of power plant and used device.
In the technical process of power plant, boiler feed water system and ash disposal system are wherein arranged, the roughly technical process between them is as shown in Figure 1.
Process from grey pond to the ash field is the ash disposal process, owing to have Calcium hydrogen carbonate and water soluble oxidized calcium etc., the easy fouling of ash removal pipe in the mortar, this is the technical barrier that perplexs power plant for a long time, for solving the scale removal problem, each power plant has adopted several different methods, but all undesirable.As: what have adds the weak acid resin desalination with lime method, and the buck that liquidates carries out advanced treatment, and the investment of this method is big, and equipment is complicated and environment had pollution; Have plenty of to add water quality stabilizer in buck, this method is simple, but the working cost height has pollution to environment; The acid buck that liquidates that adds that has carries out pre-treatment, reaches the purpose of scale inhibition, and this method effect is obvious, but exists the operation difficulty big, problems such as corrosive pipeline wearing and tearing.
The objective of the invention is to overcome the deficiency that prior art exists, and provide a kind of ash removal pipe is carried out the method for scale removal and required a kind of device, have that working cost is low, features high scale-removing effect, pipeline be not subjected to the characteristics of burn into wearing and tearing, but also can utilize the condition of the technical process of power plant itself.
The objective of the invention is to realize in the following way:
The method of descaling of ash removal pipe of power plant; feature is to add the acid flushing in the ash removal pipe; adding cathodic protector in the ash removal pipe simultaneously protects; this cathodic protector is made up of insulation conducting ring, direct supply, positive and negative electrode lead; the insulation conducting ring is installed on the ash removal pipe, and it is made up of graphite annulus and outer field ceramic ring, and a terminal stud is connected on the graphite annulus; this terminal stud connects positive wire, and ash removal pipe connects cathode conductor.
The above direct supply can be obtained by vertoro by alternating-current.
Described in the prior art, the spent acid (HCL) that in the technical process of power plant, comes out from the sun bed of boiler feed water system and the salkali waste (NaOH) of cloudy bed, mix bed salt solution through neutralization tank to ash disposal system, be discharged to the ash.And ash removal pipe of the present invention also is the part in power plant's technical process, its scale removal with acid can utilize said system middle-jiao yang, function of the spleen and stomach bed to be provided spent acid, for this reason, former boiler feed water system is improved: the spent acid of sun bed discharging is by spent acid pipe influx spent acid pond, salkali waste, the salt solution of cloudy bed, mixed bed are pooled to the salkali waste pond by salkali waste pipeline, brine pipeline respectively, spent acid pond, salkali waste pond all enter in the ash removal pipe by the spent acid alkali pump, are separately installed with valve between spent acid pond, salkali waste pond and spent acid alkali pump.During scale removal, make spent acid flushing ash removal pipe earlier, open cathodic protector simultaneously, the salkali waste that pours again in the salkali waste pond is finished in acid.Therefore, improve boiler feed water system (just original neutralization tank is removed, spent acid, salkali waste are collected respectively), do not influenced the discharging of spent acid, salkali waste.
Below in conjunction with description of drawings:
Fig. 1 is the prior art processes schematic flow sheet.
Fig. 2 is the process flow diagram of most preferred embodiment of the present invention.
Fig. 3 is the structural representation of insulation conducting ring.
Cathodic protector is made up of insulation conducting ring, direct supply, positive and negative electrode lead.Direct supply is realized by AC power and vertoro.The insulation conducting ring is made up of graphite annulus 1, outer field ceramic ring 2, connects a terminal stud 3 on the graphite annulus 1, and the insulation conducting ring is connected on the ash removal pipe by the flange of ash removal pipe end, and is the part of pipeline, the corrosion of graphite annulus acid and alkali.At interval a plurality of insulation conducting rings are set on the ash removal pipe, the terminal stud 3 on the conducting ring connects positive wire, and the steel pipe of ash removal pipe connects cathode conductor.
In order to increase the spent acid that compiles, the concentration of salkali waste, the wash-down water of sun bed, cloudy bed, mixed bed compiles one by the recycle-water pipeline respectively and reclaims in the pond, the water of decationize control overflow and is also entered in the recovery pond after the carbon removal tower enters water storage box from sun bed, by adjusting the pH value that reclaims water in the pond, become softening water,, can not have the blowdown campaign because its saltiness is very low, can be used as recirculated water and use, thus also make entire power plant process flow saves water.
The method of descaling of ash removal pipe is: open the spent acid pond earlier, spent acid is squeezed in the ash removal pipe by the spent acid alkali pump, opens cathodic protector simultaneously, and under cathodic protector, metallic conduit is protected, avoids corrosion.Beginning, because the dirt layer is thicker, dirt layer resistance is big, dirt layer elder generation and acid-respons are dissolved, along with the attenuation of dirt layer, dirt layer resistance decreasing, the hydrogen ion in the pipe in the medium is reduced, and becomes H in a large number
2, the dirt layer is no longer dissolved, and tube wall just has skim dirt layer to play protective membrane like this, makes pipeline avoid wearing and tearing.As local dirty pull-up when falling, the hydrogen ion in tube wall and the pipe in the medium directly contacts, hydrogen ion is reduced and becomes H
2Make the local medium of contiguous tube wall show alkalescence, hydrocarbonate in hydroxide ion and the water produces precipitin reaction, this place is repaired, behind the intact spent acid of pump, again waste lye is pumped in the ash removal pipe, the pH value that can make medium is greater than 12.5, in this alkaline environment, the fouling of pipeline also is suppressed.Galvanic protection stops simultaneously behind the intact alkali of pump.Afterwards, repeat said process after a while again.Ash removal pipe is generally docked one by one by the steel pipe of about 6 meters length, can place a conducting ring on the steel pipe.
Advantage of the present invention: do not affect the proper motion of whole power plant process flow process, not only fortune The row expense is low, has solved the scale removal problem of ash removal pipe, and makes the metal pipeline avoid corrosion And wearing and tearing. Cathode protection device is simple, and can extensively be used for other acid corrosion Jie The protection of the conveyance conduit of matter. The present invention takes full advantage of giving up in the technological process of power plant own Acid, having reached turns waste into wealth.
Claims (6)
1, the method for descaling of ash removal pipe of power plant; be characterised in that; add the acid flushing in the pipeline, add cathodic protector in the ash removal pipe simultaneously and protect, this cathodic protector is made up of insulation conducting ring, direct supply, positive and negative electrode lead; the insulation conducting ring is installed on the ash removal pipe; and be the part of pipeline, it is made up of graphite annulus and outer field ceramic ring, and a terminal stud is connected on the graphite annulus; this terminal stud connects positive wire, and ash removal pipe connects cathode conductor.
2, method according to claim 1 is characterised in that direct supply is by AC power and vertoro realization.
3; method according to claim 1; be characterised in that in a sun spent acid that the provides adding ash removal pipe by boiler feed water system and wash; the spent acid of sun bed is by spent acid pipe influx spent acid pond; cloudy bed; mix the salkali waste of bed; salt solution is respectively by the salkali waste pipeline; brine pipeline is pooled to the salkali waste pond; the spent acid pond; the salkali waste pond all enters on the ash removal pipe by the spent acid alkali pump; the spent acid pond; be separately installed with valve between salkali waste pond and spent acid alkali pump; make spent acid flushing ash removal pipe earlier; open cathodic protector simultaneously; acid is poured salkali waste after finishing again; salkali waste finishes, and galvanic protection stops.
4, method according to claim 3 is characterised in that positive, cloudy, mixed wash-down water compiles in the recovery pond by the recycle-water pipeline respectively.
5, the cathodic protector that is used for the described method of claim 1 is made up of insulation conducting ring, direct supply, positive and negative electrode lead, and the insulation conducting ring is made up of graphite annulus and outer field ceramic ring, connects a terminal stud on the graphite annulus.
6, device according to claim 5 is characterised in that direct supply is by AC power and vertoro realization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95110474A CN1057945C (en) | 1995-06-01 | 1995-06-01 | Method and device for descaling ash removal pipeline of power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95110474A CN1057945C (en) | 1995-06-01 | 1995-06-01 | Method and device for descaling ash removal pipeline of power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1136982A CN1136982A (en) | 1996-12-04 |
| CN1057945C true CN1057945C (en) | 2000-11-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95110474A Expired - Fee Related CN1057945C (en) | 1995-06-01 | 1995-06-01 | Method and device for descaling ash removal pipeline of power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1057945C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107321724A (en) * | 2017-05-26 | 2017-11-07 | 株洲冶炼集团股份有限公司 | A kind of manner of cleaning up of aiutage |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095158A (en) * | 1993-05-13 | 1994-11-16 | 许阳光 | A kind of water heater scale-removing method and equipment thereof |
-
1995
- 1995-06-01 CN CN95110474A patent/CN1057945C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095158A (en) * | 1993-05-13 | 1994-11-16 | 许阳光 | A kind of water heater scale-removing method and equipment thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1136982A (en) | 1996-12-04 |
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Granted publication date: 20001101 Termination date: 20120601 |