CN102899952A - Descaling method for plate-type falling-film evaporator - Google Patents
Descaling method for plate-type falling-film evaporator Download PDFInfo
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- CN102899952A CN102899952A CN 201110221550 CN201110221550A CN102899952A CN 102899952 A CN102899952 A CN 102899952A CN 201110221550 CN201110221550 CN 201110221550 CN 201110221550 A CN201110221550 A CN 201110221550A CN 102899952 A CN102899952 A CN 102899952A
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- film evaporator
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Abstract
A descaling method for plate-type falling-film evaporators is provided, and belongs to the technical field of pulping and papermaking industries. The method includes the following steps: completely immersing a heat exchange plate of a plate-type falling-film evaporator in a white liquor containing 70-90 g/L of NaOH, boiling in an alkali environment under conditions that the temperature is 110-130 DEG C and the pressure is 0.1-0.15 MPa for 6-10 h until the fiber scale is loose; and purging the fiber scale from the surface of the heat exchange plate by using a high-pressure water gun with a pressure of 400-500 Kg/cm<2>. The method can remove fiber scale on the heat exchange plate efficiently and completely. Compared with the prior art, the method prolongs the descaling period from one month to three months, shortens the descaling time by a half, removes the scale completely, increases the efficiency of the plate-type falling-film evaporator and thus improves the production capacity of the equipment.
Description
Technical field
The present invention relates to the descaling method of plate-type down-film evaporator in the pulping and paper-making industry, specifically remove the method for the fiber dirt on heat exchanger plates surface in the plate-type down-film evaporator.
Background technology
At present; in soda pulping process paper-making industry industry; alkali in the black liquor that common employing firing method recovery pulping process produces; to solve it to the pollution problem of environment; and plate-type down-film evaporator is the concentrated capital equipment of black liquor vaporizing; but; because black liquor itself is with the quantitative De Xie dimension of song Yi problem; usually the moving row of plate-type down-film evaporator is about one month, and its heat exchanger plates surface knot fiber dirt is more serious, and very hard and firm; can not reach normal heat transfer effect to making; have a strong impact on evaporation efficiency, after the problems referred to above occur, usually adopt washing; directly go to beat with giant or the method for pickling goes to process.
Wash He Zha in the above-mentioned processing method with water and connect that to go to beat not only downtime with giant long; and can not be effectively thoroughly dirty except the heat exchanger plates surface institute fiber of tying; also can cause continuous accumulation; cause the actual production capacity of plate-type down-film evaporator to reduce gradually; it is dirty to remove the heat exchanger plates surface institute fiber of tie with the method for pickling, not only requires with high content of technologyly, and professional scale removal troop need to be arranged; and to plate-type down-film evaporator in-house facility seriously corroded, cause equipment damage.
Summary of the invention
The shortcoming that exists in order to overcome above-mentioned prior art, of the present invention one the descaling method that is to provide a kind of plate-type down-film evaporator, it is dirty efficiently to remove up hill and dale the heat exchanger plates surface institute fiber of tie, and heat exchanger plates is surperficial without any attachment after the scale removal, also can not cause corrosion to equipment simultaneously.
Technical scheme of the present invention is: a kind of descaling method of pulling the formula falling film evaporator may further comprise the steps:
1) the white liquid of annotating: be that the white liquid of 70-90g/l joins in the plate-type down-film evaporator liquid chamber by advancing to imitate the black liquor pump containing NaOH concentration, till liquid level adds to and just the heat exchanger plates of falling film evaporator soaked fully;
2) soda boiling heat exchanger plates: the hydrophobic valve of opening the plate-type down-film evaporator steam chest, then the slow heating steam admission valve of Kai Qi Qi, when plate-type down-film evaporator steam chest internal pressure slowly rises to 0.1-0.15Mpa, control steam chest and estimate at 110-130 ℃ then soda boiling heat exchanger plates 6-10 hour;
3) clean heat exchanger plates: close heating steam valve stopped heating, the logical effect black liquor pump that presses out is extracted white liquid out: add clear water again in the plate-type down-film evaporator liquid chamber, utilize circulating pump to wash the residual white liquid on heat exchanger plates surface, the rinse water that then will contain white liquid is extracted out by going out out effect black liquor pump;
4) remove the fiber dirt: utilize the giant of pressure 400-500Kg/cm2 the plate-type down-film evaporator heat exchanger plates to be carried out the removing of fiber dirt;
5) the fiber dirt under removing in the mutually trans falling film evaporator is thoroughly cleared.
As further technical scheme of the present invention: the white liquid behind the soda boiling heat exchanger plates and clean heat exchanger plates after contain white liquid rinse water all deliver to by going out to imitate the black liquor blowback in the white liquid bath of caustic room.
In the soda boiling heat exchanger plates process, the white liquid level condition in the root power plate-type down-film evaporator liquid chamber is replenished white liquid once.
The invention has the beneficial effects as follows: it is dirty that it can high put the heat exchanger plates surface institute fiber of tying of removing up hill and dale plate-type down-film evaporator, and heat exchanger plates cleaning surfaces after the scale removal without any attachment, can not cause corrosion to equipment simultaneously yet; Compare with traditional descaling method, the strong, colourless liquor distilled from sorghum cycle of removing of this method once can extend to three months once from a scale removal in month, and each scale removal time can shorten to original half, because more thorough to the removing of fouling, the evaporation efficiency of pulling the formula falling film evaporator increases substantially, thereby has improved the production capacity of equipment, and to promoting to improve the operating efficiency that alkali reclaims, thereby reduced the cost of paper industry, also improved simultaneously environmental protection pollution treatment ability.
The tool present embodiment
The descaling method of this plate-type down-film evaporator may further comprise the steps:
1) the white liquid of annotating: for the white liquid that contains NaOH concentration 70-90g/l joins in the plate-type down-film evaporator liquid chamber by advancing to imitate the black liquor pump, till liquid level adds to and just the heat exchanger plates of falling film evaporator soaked fully.
Described white liquid advances to imitate the gorge liquid pump and is communicated with the white liquid bath of caustic room from this workshop caustic room.
2) soda boiling heat exchanger plates: the hydrophobic valve of making a call to twenty plate-type down-film evaporator steam chest, and notice that the valve port that hydrophobic valve is opened will be greatly, then slowly open the heating steam admission valve on it, when plate-type down-film evaporator steam chest internal pressure slowly rises to 0.1-0.15Mpa, control steam chest temperature is at 110-130 ℃. then the soda boiling heat exchanger plates is 6 10 hours, make to tie the fiber dirt soft.
In the soda boiling heat exchanger plates process, according to the white liquid level condition in the plate-type down-film evaporator liquid chamber, replenish white liquid once, to guarantee the soda boiling effect.
3) clean heat exchanger plates: close heating steam valve stopped heating, logical cun goes out to imitate the black liquor pump and white liquid is extracted out is transmitted back to the white liquid bath of this workshop caustic room, can be reused for production; Add a small amount of clear water again in the plate-type down-film evaporator liquid chamber, utilize the circulating pump lake to wash the residual white liquid on heat exchanger plates surface off, the rinse water that then will contain white liquid is transmitted back to the white liquid bath of this workshop caustic room by going out to imitate the extraction of black liquor pump, prevents the pollution of the environment.
4) remove the fiber dirt: utilize giant carries out the fiber dirt to the plate-type down-film evaporator heat exchanger plates the removing of falling of pressure 400-500Kg/cm2.
Because through dirty become soft of the fiber of soda boiling, so giant can be thoroughly with its removing.
5) the fiber dirt under removing in the plate-type down-film evaporator is thoroughly cleared, stop up plate-type down-film evaporator black liquor distributor box and black liquor pipeline when avoiding starting shooting.
Claims (3)
1. the descaling method of a plate-type down-film evaporator is characterized in that, may further comprise the steps:
1), the white liquid of annotating: be that the white liquid of 70-90g/l joins in the plate-type down-film evaporator liquid chamber by advancing to imitate the black liquor pump containing NaOH concentration, till liquid level adds to and just the heat exchanger plates of falling film evaporator soaked fully.
2) soda boiling heat exchanger plates: the hydrophobic valve of opening the plate-type down-film evaporator steam chest, then slowly open the heating steam admission valve on it, when plate-type down-film evaporator steam chest internal pressure slowly rises to 0.1-0.15Mpa, control the steam chest temperature at 110-130 ℃, then soda boiling heat exchanger plates 6-10 hour.
3) cleaning heat exchanger plates " closes heating steam valve stopped heating, by going out to imitate the black liquor pump white liquid is extracted out; Add clear water again in the plate-type down-film evaporator liquid chamber, utilize circulating pump to wash the residual white liquid on heat exchanger plates surface, then the rinse water of high-ranking military officer's spoken parts in an opera liquid is extracted out by going out to imitate the black liquor pump.
4) remove the fiber dirt: utilize the giant of pressure 400-500Kg/cm2 the plate-type down-film evaporator heat exchanger plates to be carried out the removing of fiber dirt.
5) the fiber dirt under removing in the plate-type down-film evaporator is thoroughly cleared.
2. the descaling method of pulling the formula falling film evaporator according to claim 1 is characterized in that, the rinse water of the white liquid behind the soda boiling heat exchanger plates and the contained white liquid of cleaning heat exchanger plates all is transmitted back to by going out the effect liquid pump in the white liquid bath of caustic room.
3. the descaling method of plate-type down-film evaporator according to claim 1 and 2 is characterized in that, in the soda boiling heat exchanger plates process, according to the white liquid level condition in the plate-type down-film evaporator liquid chamber, replenishes white liquid once.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110221550 CN102899952A (en) | 2011-07-24 | 2011-07-24 | Descaling method for plate-type falling-film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110221550 CN102899952A (en) | 2011-07-24 | 2011-07-24 | Descaling method for plate-type falling-film evaporator |
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| CN102899952A true CN102899952A (en) | 2013-01-30 |
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| CN 201110221550 Pending CN102899952A (en) | 2011-07-24 | 2011-07-24 | Descaling method for plate-type falling-film evaporator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512421A (en) * | 2013-10-08 | 2014-01-15 | 中国铝业股份有限公司 | Method for cleaning scales of heat exchanger |
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2011
- 2011-07-24 CN CN 201110221550 patent/CN102899952A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512421A (en) * | 2013-10-08 | 2014-01-15 | 中国铝业股份有限公司 | Method for cleaning scales of heat exchanger |
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| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Chen Minglin Document name: Notification that Application Deemed to be Withdrawn |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130130 |