CN103568112A - Still kettle vacuumizing technology - Google Patents
Still kettle vacuumizing technology Download PDFInfo
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- CN103568112A CN103568112A CN201210255423.9A CN201210255423A CN103568112A CN 103568112 A CN103568112 A CN 103568112A CN 201210255423 A CN201210255423 A CN 201210255423A CN 103568112 A CN103568112 A CN 103568112A
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- still kettle
- temperature
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- kettle
- moisture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
Abstract
The invention discloses a still kettle vacuumizing technology. After a cement product is subjected to autoclaved curing, the still kettle vacuumizing technology sequentially comprises a step of emptying residual water vapor in a still kettle, including, keeping the still kettle in a sealed state, and emptying residual water vapor in the still kettle within 1-2 hours through vacuumizing; a step of discharging volatilizable moisture in the still kettle, including, volatilizing residual moisture on the surface of the cement product and in the still kettle through vacuumizing and discharging the moisture out of the still kettle; a step of opening a door of the still kettle, including, opening a blow-off valve of the still kettle, and releasing a negative pressure in the still kettle. With the adoption of the still kettle vacuumizing technology, occurrence of cracks of the cement product during the still kettle maintenance can be avoided, and production efficiency can be improved.
Description
Technical field
The present invention relates to cement products still kettle evacuation process, relate in particular to a kind of still kettle evacuation process of fiber cement external wall panel.
Background technology
At present, in the production process of cement products, can carry out steam press maintenance to cement products, the cement products that is about to have certain initial strength is put into still kettle, then pass into high-temperature high-pressure steam, according to the intensification of technological requirement, boost, constant voltage and drawdown curve, product is carried out to HTHP maintenance.
Existing steaming pressuring curing process has following defect or deficiency: when steam press maintenance finishes, temperature in the kettle, 100 ℃ of left and right, has a large amount of steam to exist, if open immediately still door, discharges fast heat in still, the cement products temperature in still also can sharply decline, and temperature is very inhomogeneous.Can cause Bu He top layer, cement products limit moisture sharply to volatilize, cement products, under temperature stress and the acting in conjunction of drying shrinkage stress, easily produces tiny crackle or cracking, affects product strength and performance, even can cause the generation of a large amount of waste products simultaneously; If progressively reduce temperature in the kettle or close the mode that still door is lowered the temperature naturally and take slowly to open still door, can greatly extend again the operation period of still kettle, reduce production efficiency, and, if temperature and humidity control is improper in still kettle, cement products still has the possibility of cracking.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of still kettle evacuation process, can avoid the crackle of cement products in steam press maintenance to produce, and can enhance productivity.
For solving the problems of the technologies described above, the invention provides a kind of still kettle evacuation process, cement products is completed after steam press maintenance, carry out successively following steps:
The step of residual water steam in emptying still kettle: keep still kettle airtight, by vacuumizing in 1-2 hour water vapour remaining in emptying still kettle;
Discharge the step of volatilizable moisture in still kettle: by vacuumizing, make moisture evaporation residual in cement products surface and still kettle and discharge still kettle;
Open the step of still kettle still door: open still kettle exhaust-valve, lay down the negative pressure in still kettle.
Further, in described emptying still kettle, in the step of residual water steam, the temperature in still kettle is reduced to the first temperature range from initial temperature;
Wherein, described initial temperature is 100-105 ℃, and described the first temperature range is 94-95 ℃.
Further, the step of volatilizable moisture in described discharge still kettle, further comprised with the next stage:
Buck stage, vacuumizes the vacuum improving in still kettle by vavuum pump, reduce the pressure in still kettle, until the negative pressure in still kettle reaches moisture evaporation critical pressure value, and in this stage, the temperature in still kettle remains on the first temperature range;
Temperature-fall period, negative pressure in still kettle reaches after moisture evaporation critical pressure value, maintain the vacuum in still kettle, the moisture of the ponding in still kettle and cement products inside volatilizees in a large number, and discharged still kettle by vavuum pump, the temperature in this stage in still kettle is reduced to the second temperature from described the first temperature range.
Further, described volatilization critical pressure value is-arbitrary value in 0.05Mpa～-0.07Mpa interval;
Described the second temperature is 76 ℃～80 ℃ interval arbitrary values.
Further, described volatilization critical pressure value is-0.06Mpa.
Further, described the second temperature is 78 ℃.
Further, when the temperature in still kettle reaches described the second temperature, judge the discharge that has completed volatilizable moisture in still kettle, finish the step of volatilizable moisture in described discharge still kettle.
Further, the step of described unlatching still kettle still door, specifically comprises:
When steam pressure temperature in the kettle reaches after set point of temperature, open still kettle exhaust-valve, in 4～5 minutes, lay down the negative pressure in still kettle, then open still kettle still door.
The present invention by cement products after steam press maintenance finishes, by the technological parameter of setting and pattern, carry out still kettle and vacuumize, the easy to crack or low problem of production efficiency while slowly opening still door when having solved cement products opening still door fast after steam press maintenance.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of still kettle evacuation process of the present invention.
The specific embodiment
The invention provides a kind of still kettle evacuation process, as shown in Figure 1, cement products completed after steam press maintenance, carry out successively following steps:
The step of residual water steam in emptying still kettle: keep still kettle airtight, by the mode that vacuumizes remaining water vapour in emptying still kettle in 1-2 hour;
Discharge the step of volatilizable moisture in still kettle: by vacuumizing, make moisture evaporation residual in cement products surface and still kettle and discharge still kettle;
Open the step of still kettle still door: complete after the discharge of volatilizable moisture in still kettle, open still kettle exhaust-valve, lay down the negative pressure in still kettle.
Further, in described emptying still kettle, in the step of residual water steam, the temperature in still kettle is reduced to the first temperature range from initial temperature (100-105 ℃);
Wherein, described the first temperature range is preferably 94-95 ℃.
Further, the step of volatilizable moisture in described discharge still kettle, further comprised with the next stage:
Buck stage, by vavuum pump, vacuumize the vacuum progressively improving in still kettle, pressure in still kettle is progressively reduced, until the negative pressure in still kettle reaches moisture evaporation critical pressure value in still, the temperature in this stage in still kettle remains on the first temperature range;
Temperature-fall period, the negative pressure in still kettle reaches after moisture evaporation critical pressure value, maintains the vacuum in still kettle, and still kettle internal water accumulation and cement products internal moisture are volatilized in a large number, and is discharged still kettle by vavuum pump.
Wherein, described moisture evaporation critical pressure value is-0.05Mpa～-0.07Mpa, is preferably-0.06Mpa;
Described the second temperature is the arbitrary value in 76 ℃-80 ℃, is preferably 78 ℃.
Further, the judgment condition that completes the volatilization of residual moisture is:
When the temperature in still kettle reaches the second temperature, judge and completed the discharge that can discharge moisture in still kettle, finish the step of volatilizable moisture in described discharge still kettle.
Further, open the step of still kettle still door, specifically comprise: slowly open still kettle exhaust-valve, in 4～5 minutes, lay down the negative pressure in still kettle, then open still kettle still door, residual ponding in the still kettle of draining.
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.
In the present embodiment, after fiber cement external wall panel steam press maintenance finishes, (initial temperature 100-105 ℃ in still), vacuumizes 3-9 hour, specifically comprises the following steps:
1) 0-1h, discharges residual water vapour in still kettle, and temperature in the kettle is reduced to 94-95 ℃ from 100 ℃;
When this step finishes, the residual water steam in still kettle is discharged substantially.
In prior art, be after steam press maintenance, directly to open still kettle, naturally lower the temperature and discharge water vapour, in the present invention, be to keep still kettle air-tight state after steam press maintenance, employing vacuumizes discharges residual water steam in still kettle, in this process, the variations in temperature of cement products is little, and temperature is even slow decreasing, does not have the uneven temperature stress producing of obvious temperature.And in prior art, open after still kettle, Cryogenic air outside still enters in still, and the surface or the limit portion temperature that cause cement products to touch Cryogenic air sharply decline, and internal temperature reduces slowly, different parts temperature inequality makes cement products produce larger temperature stress, easily cracks.And by this mode of the present invention, can greatly reduce the crackle of cement products.
2) 1-2h, progressively improves the vacuum in still kettle, finally reaches-0.06MPa, and temperature stabilization is at 94-95 ℃;
When this step finishes, reached in still kettle the moisture condition of volatilizing in a large number.
3) 2-6h, maintains vacuum-0.06MPa, and fiber cement external wall panel top layer and inner moisture are are evenly scattered and disappeared, and in this process, temperature drops to 78 ℃ by 94 ℃, afterwards, vacuumizes end;
When this step finishes, residual volatilizable moisture substantially volatilizees complete and is discharged from cement products and at the bottom of still kettle.
In the present invention, by impelling in cement products and still kettle moisture evaporation and being ejected to reach by vavuum pump, reduce the particularly object of cement products temperature of still kettle.In this process, due to the existence of negative pressure, the volatile ratio of cement products internal moisture is more even, and the volatile zone of moisture is walked heat, and cement products temperature is also declined thereupon comparatively uniformly.In prior art, open in still kettle nature temperature-fall period, the volatilization of moisture and the reduction of temperature are all extremely inhomogeneous, easily produce temperature and humidity stress, cause cement products cracking.And by this mode of the present invention, can further reduce the crackle of cement products.
4) by slowly opening still kettle exhaust-valve, in 4-5 minute, lay down the negative pressure in still kettle.Then open still door, residual ponding in the still kettle of draining.
These are only preferred case study on implementation of the present invention; be not limited to the present invention; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (8)
1. a still kettle evacuation process, is characterized in that, cement products is completed after steam press maintenance, carries out successively following steps:
The step of residual water steam in emptying still kettle: keep still kettle airtight, by vacuumizing in 1-2 hour water vapour remaining in emptying still kettle;
Discharge the step of volatilizable moisture in still kettle: by vacuumizing, make moisture evaporation residual in cement products surface and still kettle and discharge still kettle;
Open the step of still kettle still door: open still kettle exhaust-valve, lay down the negative pressure in still kettle.
2. still kettle evacuation process as claimed in claim 1, is characterized in that,
In described emptying still kettle, in the step of residual water steam, the temperature in still kettle is reduced to the first temperature range from initial temperature;
Wherein, described initial temperature is 100-105 ℃, and described the first temperature range is 94-95 ℃.
3. still kettle evacuation process as claimed in claim 1 or 2, is characterized in that, the step of volatilizable moisture in described discharge still kettle, further comprised with the next stage:
Buck stage, vacuumizes the vacuum improving in still kettle by vavuum pump, reduce the pressure in still kettle, until the negative pressure in still kettle reaches moisture evaporation critical pressure value, and in this stage, the temperature in still kettle remains on the first temperature range;
Temperature-fall period, negative pressure in still kettle reaches after moisture evaporation critical pressure value, maintain the vacuum in still kettle, the moisture of the ponding in still kettle and cement products inside volatilizees in a large number, and discharged still kettle by vavuum pump, the temperature in this stage in still kettle is reduced to the second temperature from described the first temperature range.
4. still kettle evacuation process as claimed in claim 3, is characterized in that,
Described volatilization critical pressure value is-arbitrary value in 0.05Mpa～-0.07Mpa interval;
Described the second temperature is 76 ℃～80 ℃ interval arbitrary values.
5. still kettle evacuation process as claimed in claim 4, is characterized in that,
Described volatilization critical pressure value is-0.06Mpa.
6. still kettle evacuation process as claimed in claim 4, is characterized in that,
Described the second temperature is 78 ℃.
7. still kettle evacuation process as claimed in claim 3, is characterized in that,
When the temperature in still kettle reaches described the second temperature, judge the discharge that has completed volatilizable moisture in still kettle, finish the step of volatilizable moisture in described discharge still kettle.
8. still kettle evacuation process as claimed in claim 4, is characterized in that, the step of described unlatching still kettle still door, specifically comprises:
When steam pressure temperature in the kettle reaches after set point of temperature, open still kettle exhaust-valve, in 4～5 minutes, lay down the negative pressure in still kettle, then open still kettle still door.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392442A (en) * | 2007-09-19 | 2009-03-25 | 比耶拉皱缩处理公司 | Non-continuous steaming method and device in autoclave |
| CN201268029Y (en) * | 2008-10-10 | 2009-07-08 | 上海良浦新型墙体材料有限公司 | Recovery and utilization apparatus for autoclaved aerated concrete building block discharging vapor |
| CN101555113A (en) * | 2009-05-19 | 2009-10-14 | 李秋义 | Aeroconcrete and preparation method thereof |
| CN101666130A (en) * | 2009-07-20 | 2010-03-10 | 浙江天达环保有限公司 | New lightweight high strength autoclaved aerated concrete block and preparation method thereof |
| CN101774796A (en) * | 2010-01-29 | 2010-07-14 | 安徽大昌矿业集团有限公司 | Method for preparing aerated concrete blocks by adopting iron ore tailings |
| JP4532932B2 (en) * | 2004-02-25 | 2010-08-25 | 株式会社アースエンジニアリング | Architectural interior materials |
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2012
- 2012-07-23 CN CN201210255423.9A patent/CN103568112B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4532932B2 (en) * | 2004-02-25 | 2010-08-25 | 株式会社アースエンジニアリング | Architectural interior materials |
| CN101392442A (en) * | 2007-09-19 | 2009-03-25 | 比耶拉皱缩处理公司 | Non-continuous steaming method and device in autoclave |
| CN201268029Y (en) * | 2008-10-10 | 2009-07-08 | 上海良浦新型墙体材料有限公司 | Recovery and utilization apparatus for autoclaved aerated concrete building block discharging vapor |
| CN101555113A (en) * | 2009-05-19 | 2009-10-14 | 李秋义 | Aeroconcrete and preparation method thereof |
| CN101666130A (en) * | 2009-07-20 | 2010-03-10 | 浙江天达环保有限公司 | New lightweight high strength autoclaved aerated concrete block and preparation method thereof |
| CN101774796A (en) * | 2010-01-29 | 2010-07-14 | 安徽大昌矿业集团有限公司 | Method for preparing aerated concrete blocks by adopting iron ore tailings |
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