CN100528383C - Plate-type down-film evaporator descaling method - Google Patents
Plate-type down-film evaporator descaling method Download PDFInfo
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- CN100528383C CN100528383C CNB2007101152444A CN200710115244A CN100528383C CN 100528383 C CN100528383 C CN 100528383C CN B2007101152444 A CNB2007101152444 A CN B2007101152444A CN 200710115244 A CN200710115244 A CN 200710115244A CN 100528383 C CN100528383 C CN 100528383C
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- film evaporator
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- heat exchanger
- exchanger plates
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Abstract
A descaling method for plate-type falling-film evaporators is provided, which belongs to the technology field of pulp and paper industry. The method includes the following steps: immersing a heat exchange plate of a plate-type falling-film evaporator in a white liquor containing 70-90 g/L of NaOH, boiling under such conditions that the temperature is 110-130 DEG C and the pressure is 0.1-0.15 MPa until the fiber scale is loose; and purging the fibrous scale from the surface of the heat exchange plate by using a high-pressure water gun at a pressure of 400-500 Kg/cm<2>. The method can remove fiber scale efficiently and completely. Compared with the prior art, the method lengthens the descaling period from one month to three months, shorten the descaling time by a half, removes the scale completely, increases the efficiency of the plate-type falling-film evaporator and 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 is the method for removing the fiber dirt on heat exchanger plates surface in the plate-type down-film evaporator.
Background technology
At present; in the soda pulping process paper industry; generally adopt firing method to reclaim alkali in the black liquor that pulping process produces; to solve its pollution problem to environment; and plate-type down-film evaporator is the capital equipment that black liquor vaporizing concentrates; but; because black liquor itself has a certain amount of fiber problem; usually the plate-type down-film evaporator operation 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 exchange effect to making; have a strong impact on evaporation efficiency, after the problems referred to above take place, adopt washing usually; directly go to beat or the method for pickling goes to handle with giant.
Wash with water in the above-mentioned processing method and directly to go to beat not only downtime with giant long; and can not thoroughly remove the heat exchanger plates surface fiber dirt of tying effectively; also can cause dirt constantly to be piled up; cause the actual production capacity of plate-type down-film evaporator to reduce gradually; remove the heat exchanger plates surface fiber dirt of tying with the method for pickling, not only require with high content of technologyly, need professional scale removal troop; and, cause equipment damage to plate-type down-film evaporator in-house facility seriously corroded.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the object of the present invention is to provide a kind of descaling method of plate-type down-film evaporator, can efficiently remove the heat exchanger plates surface fiber dirt of tying up hill and dale, the no any attachment in heat exchanger plates surface can not cause corrosion to equipment simultaneously yet after the scale removal.
Technical scheme of the present invention is: a kind of descaling method of plate-type down-film evaporator may further comprise the steps:
1) the white liquid of annotating: containing NaOH concentration is 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, 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, slowly open the heating steam admission valve on it then, 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 ℃, soda boiling heat exchanger plates 6-10 hour then;
3) clean heat exchanger plates: close the heating steam admission valve and stop heating, white liquid is extracted out by going out to imitate the black liquor pump; 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 will contain white liquid is then extracted out by going out to imitate the black liquor pump;
4) remove the fiber dirt: utilize pressure 400-500Kg/cm
2Giant the plate-type down-film evaporator heat exchanger plates is carried out the removing of fiber dirt;
5) the fiber dirt under removing in the plate-type down-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 by going out to imitate in the white liquid bath that the black liquor blowback delivers to caustic room.
In the soda boiling heat exchanger plates process,, replenish white liquid once according to the white liquid level condition in the plate-type down-film evaporator liquid chamber.
The invention has the beneficial effects as follows: it can efficiently remove the heat exchanger plates surface fiber dirt of tying of plate-type down-film evaporator up hill and dale, and heat exchanger plates cleaning surfaces after the scale removal does not have any attachment, can not cause corrosion to equipment simultaneously yet; Compare with traditional descaling method, the scale removal cycle of this method once can extend to three months once from a scale removal in month, and each scale removal time can foreshorten to original half, because it is more thorough to the removing of fouling, the evaporation efficiency of plate-type down-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 environmental protection pollution treatment ability simultaneously.
The specific 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 black liquor pump and is communicated with the white liquid bath of caustic room from this workshop caustic room.
2) soda boiling heat exchanger plates: open the hydrophobic valve of plate-type down-film evaporator steam chest, and will notice that the valve port that hydrophobic valve is opened will be greatly; Slowly open the heating steam admission valve on it then, 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 ℃, soda boiling heat exchanger plates 6-10 hour then, make to tie the fiber dirt soft.
In the soda boiling heat exchanger plates process,, replenish white liquid once, to guarantee the soda boiling effect according to the white liquid level condition in the plate-type down-film evaporator liquid chamber.
3) clean heat exchanger plates: close the heating steam admission valve and stop heating, white liquid extraction is transmitted back to the white liquid bath of this workshop caustic room, can be reused for production by going out to imitate the black liquor pump; Add a small amount of 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 will contain white liquid then 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 pressure 400-500Kg/cm
2Giant the plate-type down-film evaporator heat exchanger plates is carried out the removing of fiber dirt.
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, a kind of descaling method of plate-type down-film evaporator is characterized in that, may further comprise the steps:
1) the white liquid of annotating: containing NaOH concentration is 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, 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, slowly open the heating steam admission valve on it then, 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 ℃, soda boiling heat exchanger plates 6-10 hour then;
3) clean heat exchanger plates: close the heating steam admission valve and stop heating, white liquid is extracted out by going out to imitate the black liquor pump; 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 will contain white liquid is then extracted out by going out to imitate the black liquor pump;
4) remove the fiber dirt: utilize pressure 400-500Kg/cm
2Giant the plate-type down-film evaporator heat exchanger plates is 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 plate-type down-film evaporator according to claim 1 is characterized in that, the white liquid behind the soda boiling heat exchanger plates and clean heat exchanger plates after contain white liquid rinse water all by going out to imitate in the white liquid bath that the black liquor blowback delivers to 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 |
|---|---|---|---|
| CNB2007101152444A CN100528383C (en) | 2007-12-12 | 2007-12-12 | Plate-type down-film evaporator descaling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101152444A CN100528383C (en) | 2007-12-12 | 2007-12-12 | Plate-type down-film evaporator descaling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101254504A CN101254504A (en) | 2008-09-03 |
| CN100528383C true CN100528383C (en) | 2009-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101152444A Expired - Fee Related CN100528383C (en) | 2007-12-12 | 2007-12-12 | Plate-type down-film evaporator descaling method |
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| CN (1) | CN100528383C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502730A (en) * | 2011-09-30 | 2012-06-20 | 中国铝业股份有限公司 | Method for washing aluminum oxide evaporator in online way |
| CN105665344A (en) * | 2016-03-29 | 2016-06-15 | 中冶南方工程技术有限公司 | Cleaning method for acid gun jet system |
| CN107128990A (en) * | 2017-06-30 | 2017-09-05 | 华南理工大学 | The method and apparatus that a kind of MVR evaporators plate steam channel downflow type string is washed |
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2007
- 2007-12-12 CN CNB2007101152444A patent/CN100528383C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN101254504A (en) | 2008-09-03 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20100112 |