CN211521664U - Device for improving quality of evaporation condensate water of sulfate pulping black liquor - Google Patents
Device for improving quality of evaporation condensate water of sulfate pulping black liquor Download PDFInfo
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- CN211521664U CN211521664U CN201921510035.4U CN201921510035U CN211521664U CN 211521664 U CN211521664 U CN 211521664U CN 201921510035 U CN201921510035 U CN 201921510035U CN 211521664 U CN211521664 U CN 211521664U
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Abstract
The utility model provides a device for improving the quality of evaporation condensate water of black liquor of pulping by a sulfate method; the flash steam containing organic matters generated by the black liquor flash tank enters the middle upper part of the inner cavity of the plate heater of the plate-type falling film evaporator, and the sewage condensate containing organic matters generated by the condensation of the flash steam flows downwards along the plate cavity under the action of gravity; clean steam enters the lower part of the plate heater, flows upwards by means of pressure difference, forms cross flow with the sewage condensate, and organic matters in the sewage condensate preferentially volatilize and then converge to a post-condensation area of the heating plate for condensation in the process of generating dynamic steam-liquid balance between steam and condensate, and meanwhile, water steam in the steam preferentially condenses in a main condensation area and reaches the bottom of the heater under the action of gravity; organic matters in the condensate in the main condensation area are volatilized, and the condensate water containing COD components formed in the post condensation area is discharged out of the system for additional treatment. The utility model provides the high quality of steam condensate water reduces steam condensate water COD value.
Description
Technical Field
The utility model belongs to papermaking industry slurrying waste water treatment field, concretely relates to device that sulfate slurrying black liquor evaporating system improves steam condensate water quality.
Background
In the evaporation process of the black liquor of the chemical sulfate pulping wastewater, the black liquor contains organic volatile substances with higher concentration, so that organic substances in flash steam of the high-temperature dilute black liquor are preferentially volatilized, and the flash steam contains the organic substances with higher concentration. Meanwhile, the non-condensed steam discharged by the evaporation system also contains organic matters with higher concentration. In the design of the traditional evaporation system, the flash steam and the non-condensed steam are directly merged into the heating steam of the plate-type falling film evaporator or the plate-type surface condenser with the latter effect and enter the lower parts of the heat exchange plates of the plate-type falling film evaporator or the plate-type surface condenser along with the heating steam. Because the heating steam is polluted, the steam stripping effect is reduced, the steam condensate also contains high-concentration organic matters, the COD value of the steam condensate is higher, and the cyclic utilization of the steam condensate in a factory is influenced;
in view of the above disadvantages, there is a need for a device for improving the quality of steam condensate, which can improve the quality of steam condensate and reduce the COD value of steam condensate.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an improve device of steam condensate water quality, reduce steam condensate water COD value.
The utility model provides a following technical scheme:
a device for improving the quality of evaporation condensate water of black liquor prepared by a sulfate method comprises the following steps: the design of an independent thin black liquor flash tank, a plate-type falling film evaporator with an independent flash steam inlet and a plate-type surface condenser with an independent non-condensed steam inlet;
wherein, the independent thin black liquor flash tank is used for independently leading out dirty flash steam evaporated by the thin black liquor flash tank;
dirty flash steam evaporated by the thin black liquor flash tank is not merged into clean heating steam, so that the heating steam is not polluted, and the self-stripping effect of the plate-type falling-film evaporator is improved;
dirty flash steam generated by the thin black liquor flash tank independently enters the upper part of a heat exchange plate of a plate-type falling film evaporator of the plate-type falling film evaporator for condensation, and dirty condensate can flow downwards along a plate cavity; the flow distance inside the heat exchange plate is increased to the height of the whole heating plate, the time of the steam stripping action is prolonged, and the steam stripping effect is improved.
And the non-condensable gas (rich in COD component) containing steam discharged by each effect evaporator of the evaporation station is independently introduced into the upper part of the heat exchange plate of the plate-type surface condenser for condensation, and the dirty condensate can flow downwards along the plate cavity; the flow distance inside the heat exchange plate is increased to the height of the whole heating plate, the time of the steam stripping action is prolonged, and the steam stripping effect is improved.
Clean steam can enter the lower part of the plate-type falling-film evaporator or the plate-type surface condenser and flows upwards through pressure difference and forms cross flow with the sewage condensate, and a dynamic steam-liquid balance process is generated between the steam and the sewage condensate in the flowing process. In the process, organic matters in the sewage condensate are continuously volatilized again and finally converged to a post-condensation area of the heating plate for condensation; meanwhile, water vapor in the steam is preferentially condensed in the main condensation area and reaches the bottom of the heater under the action of gravity. At the moment, most of organic matters in the condensate of the main condensation area are volatilized, and finally, condensate water with a very low COD value is obtained. While the dirty condensate water formed in the post-condensation zone is rich in most COD components and is discharged out of the system for additional treatment.
The utility model has the advantages that:
through the utility model discloses an improve, can reduce the COD content in the steam condensate water to the 50% below of former design, provide required necessary assurance for the retrieval and utilization of comdenstion water in the mill, have very obvious economic benefits and realistic meaning.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a view of the structure of the present invention;
labeled as: 1. a plate falling film evaporator; 2. a plate surface condenser; 3. a housing; 4. a heat exchange plate; 5. a steam distribution box; 6. an independent flash steam inlet; 7. an independent non-condensable gas inlet; 8. a noncondensable gas collection box; 9. a feed liquid circulating pump; 10. an independent thin black liquor flash tank; 411. heating the steam; 12. flash evaporation gas; 13. non-condensable gas; 14. steam condensate water; 15. dirty condensed water; 16. feeding dilute black liquor; 17. concentrating black liquor; 18. a vacuum pump interface; 19. a circulating cooling water inlet; 20 circulating cooling water outlet.
Detailed Description
As shown in fig. 1, the high-temperature feeding thin black liquor enters an independent thin black liquor flash tank 10, dirty flash steam 12 which is flashed out can be independently collected and is independently sent to an independent flash steam inlet 6 of the plate-type falling-film evaporator 1 with the latter effect, so that the condition that the dirty flash steam and the heating steam 11 are mixed to pollute the heating steam in the traditional device is avoided, clean heating steam 11 is obtained, and the self-stripping effect of the plate-type falling-film evaporator 1 is greatly improved. The dirty flash steam 12 enters the middle upper part (inner cavity) of the heat exchange plate 4 of the plate-type falling-film evaporator 1, the dirty flash steam 12 begins to condense, and the produced dirty condensate also contains higher-concentration organic matters. The dirty condensate flows downwards along the plate cavity under the action of gravity; clean heating steam 11 enters the lower part of the heat exchange plate 4 of the plate-type falling-film evaporator 1 and flows upwards by virtue of pressure difference to form convection with the sewage condensate to continuously reheat the sewage condensate, so that a dynamic steam-liquid balance process is generated. In the process, organic matters in the sewage condensate are preferentially volatilized and are continuously gathered to a post-condensation area of the heat exchange plate 4 for condensation; meanwhile, water vapor in the steam is preferentially condensed in the main condensation area and reaches the bottom of the heater under the action of gravity, at the moment, most of organic matters in the condensate 14 in the main condensation area are volatilized, the COD value of the condensate 14 in the main condensation area is greatly reduced, and relatively clean steam condensate 14 is obtained.
The highly polluted non-condensable gas 13 containing steam is conveyed to the middle and upper part (inner cavity) of the heat exchange plate 4 of the plate-type surface condenser 2 through a pipeline, the condition that the non-condensable gas containing steam and the heating steam 11 in the traditional device are mixed to pollute the heating steam is avoided, the clean heating steam 11 is obtained, and the self-stripping effect of the plate-type surface condenser 2 is greatly improved. The highly contaminated steam-containing non-condensable gas 13 starts to condense and the resulting contaminated condensate likewise contains a higher concentration of organic matter. The condensate flows downwards along the plate cavity under the action of gravity, a vapor-liquid balance process can be generated in the process, and in the process, organic matters in the condensate are preferentially volatilized and are continuously gathered to a post-condensation area of the heat exchange plate 4 for condensation; meanwhile, the water vapor in the steam is preferentially condensed in the main condensation area until the condensate reaches the bottom of the heater, at the moment, most of organic matters in the condensate in the main condensation area are volatilized, the COD value of the condensate is greatly reduced, and cleaner steam condensate water 14 is obtained.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The device for improving the quality of the evaporation condensate water of the black liquor prepared by the sulfate method is characterized in that: the system comprises an independent thin black liquor flash evaporation tank, a plate type falling film evaporator with an independent flash evaporation steam inlet, a plate type surface condenser with an independent non-condensed steam inlet and a plate type falling film evaporator with an independent flash evaporation steam inlet; the steam generated by the black liquor flash tank is connected with the middle upper part of the inner cavity of the plate heater of the plate-type falling film evaporator through the flash steam inlet, and the plate-type falling film evaporator is connected with the lower part of the plate heater through the non-condensed steam inlet; the dilute black liquor flash tank is provided with a flash steam separate outlet; the evaporation station is connected with the middle upper part of the inner cavity of the plate heater of the plate-type surface condenser through the non-condensed steam inlet; the discharge system of the plate heater is connected to the next process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921510035.4U CN211521664U (en) | 2019-09-11 | 2019-09-11 | Device for improving quality of evaporation condensate water of sulfate pulping black liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921510035.4U CN211521664U (en) | 2019-09-11 | 2019-09-11 | Device for improving quality of evaporation condensate water of sulfate pulping black liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211521664U true CN211521664U (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921510035.4U Expired - Fee Related CN211521664U (en) | 2019-09-11 | 2019-09-11 | Device for improving quality of evaporation condensate water of sulfate pulping black liquor |
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| CN (1) | CN211521664U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110723768A (en) * | 2019-09-11 | 2020-01-24 | 江苏中一环保科技股份有限公司 | Method for improving quality of evaporation condensate water of sulfate process pulping black liquor |
-
2019
- 2019-09-11 CN CN201921510035.4U patent/CN211521664U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110723768A (en) * | 2019-09-11 | 2020-01-24 | 江苏中一环保科技股份有限公司 | Method for improving quality of evaporation condensate water of sulfate process pulping black liquor |
| CN110723768B (en) * | 2019-09-11 | 2024-09-13 | 江苏中一环保科技股份有限公司 | Method for improving quality of evaporation condensate water of black liquor from pulping by sulfate process |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200918 |
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| CF01 | Termination of patent right due to non-payment of annual fee |