CN111761705B - Steam curing method for materials - Google Patents
Steam curing method for materials Download PDFInfo
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- CN111761705B CN111761705B CN202010734483.3A CN202010734483A CN111761705B CN 111761705 B CN111761705 B CN 111761705B CN 202010734483 A CN202010734483 A CN 202010734483A CN 111761705 B CN111761705 B CN 111761705B
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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
- B28B11/245—Curing concrete articles
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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
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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
- B28B11/247—Controlling the humidity during curing, setting or hardening
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- Structural Engineering (AREA)
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- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a steam curing method of a material, which comprises the steps of introducing steam into a still kettle to increase the temperature in the still kettle, generating condensed water by heat exchange between the steam and the material in the temperature increasing process, discharging a part of the condensed water in the still kettle, reserving the other part of the condensed water in the still kettle, and increasing the temperature of the condensed water reserved in the still kettle along with the input of the steam; maintaining the pressure of the still kettle to form a constant pressure process; the steam in the still kettle is discharged, so that the pressure in the still kettle is reduced, when the pressure in the still kettle is reduced to a second pressure, the condensed water in the still kettle is extracted and sent back to the still kettle, and acts on the material to cool the material, along with the continuous operation of steam discharge, the temperature of the condensed water is reduced, and the material is continuously cooled by using the condensed water in a circulating mode. The invention has the advantages of increasing the recovery amount of the residual steam, cooling the materials, having no temperature difference cracks and the like.
Description
Technical Field
The invention relates to a steam curing method of materials.
Background
The still kettle is also called a steam curing kettle and an autoclave and is a large pressure container with large volume and heavy weight. The autoclave has wide application, is widely applied to autoclave curing of building materials such as aerated concrete blocks, concrete pipe piles, lime-sand bricks, coal-ash bricks, microporous calcium silicate boards, novel light wall materials, heat-insulating asbestos boards, high-strength gypsum and the like, and completes the autoclave curing of CaO-Si 0 in the autoclave2—H2And (3) carrying out hydrothermal reaction on O. Meanwhile, the method is also widely applicable to rubber products, wood drying and antiseptic treatment, heavy metal smelting, oil-impregnated refractory brick coal infiltration, production projects meeting the requirements of glass steam curing, high-pressure treatment of chemical fiber products, high-temperature and high-pressure treatment of food cans, pulp cooking, cable vulcanization, fishing net shaping, chemical industry, medicine, aerospace industry, heat insulation materials, textile industry, military industry and other production processes needing pressure steam curing. Therefore, the materials which can be steamed in the autoclave are diversified.
Generally, the steam curing process of materials (such as the building materials mentioned above) in an autoclave is as follows: the expected engineering strength can be achieved only in several stages of temperature rise, constant temperature and temperature reduction. The process of discharging, heating, keeping constant temperature, discharging steam and cooling (CN203370523U records that the time required by an autoclave with the diameter of 2 meters and the length of 31 meters is usually different from 1.5 to 2.5 hours) is completed, and the process of taking materials is a steam curing period. Generally, the time of discharging and taking materials has little influence on the steam curing period, and if the steam curing period needs to be shortened, solutions in the aspects of temperature rise, constant temperature and steam exhaust and temperature reduction need to be provided.
The existing cooling method is to introduce cooling media outside the autoclave into the autoclave, the cooling media act on the surface of the steam-cured material, so that the material is cooled down quickly, the steam-cured material is taken out and then the next batch of material is steamed, obviously, the cooling media act on the material to accelerate the material cooling, which is beneficial to saving the steam-cured period and improving the production efficiency.
If the temperature of the steam-cured material after the constant temperature is over 184 ℃, if the temperature difference between the cooling medium (such as tap water) and the steam-cured material is obviously too large, the cooling medium forms a sharp cooling on the steam-cured material, so that the steam-cured material is cracked, and the quality of the material is affected. In addition, in the prior art, a lot of condensed water is generated in the temperature rising process of the autoclave, and in the prior art, the condensed water is often discharged to the outside of the autoclave through a pipeline. Obviously, this is a loss of thermal energy.
In addition, the cooling medium introduced into the still kettle in the prior art is tap water, and since the tap water is sprayed on the material to cool the material, the tap water is vaporized by heat, and precipitates in the tap water are easily precipitated into scale and aggregated on the nozzle of the sprayer under the action of steam, so that the nozzle is blocked, and the cooling speed and the production efficiency are reduced.
Disclosure of Invention
The invention provides a steam curing method for condensed water materials, which recovers residual steam and is used for cooling the materials.
The technical scheme for realizing the purpose of the invention is as follows:
the steam curing method of the material comprises the following steps,
s1, feeding: feeding the material to be steamed into a still kettle;
s2, temperature and pressure raising: introducing steam into the still kettle to raise the temperature in the still kettle, generating condensed water by heat exchange between the steam and the material in the temperature raising process, discharging a part of the condensed water in the still kettle, reserving the other part of the condensed water in the still kettle, raising the temperature of the condensed water reserved in the still kettle along with the input of the steam, and finishing the temperature raising and pressure raising when the pressure of the still kettle reaches a first pressure;
s3, constant pressure: after the temperature rise and the pressure rise are finished, the pressure of the still kettle is maintained to form a constant pressure process;
s4, exhausting steam and cooling: after heat preservation and pressure preservation are finished, the steam in the still kettle is discharged to reduce the pressure in the still kettle, the temperature of condensed water is reduced to be used as the condensed water, the pressure in the still kettle is reduced to a second pressure, the condensed water in the still kettle is extracted and sent back to the still kettle, the condensed water acts on the material to cool the material, and along with continuous operation of steam discharge, the temperature of the condensed water is reduced therewith, and the material is continuously cooled by using the condensed water in a circulating mode.
In the process of heating the still kettle, condensate water is continuously generated in the still kettle along with continuous heating of steam, the temperature of the condensate water at the beginning is lower, and the recycling value of the lower condensate water is not high, so that the condensate water with the lower temperature is discharged from the still kettle, and the condensate water with the higher temperature is reserved in the still kettle and is heated along with the heating of the still kettle.
When the still kettle is cooled, the condensed water in the still kettle is subjected to flash evaporation, the temperature of the condensed water is basically consistent with the corresponding saturation temperature of the steam pressure in the still kettle, slightly higher than the saturation temperature, but not higher than the saturation temperature, but the temperature of a product (material) in the still kettle is higher than the temperature of saturated steam in the still kettle due to no cooling, the temperature of the condensed water in the still kettle and the temperature of the material are reduced along with the discharge of the steam in the still kettle, but the cooling speed of the condensed water is higher than the cooling speed of the material, and the temperature difference value of the condensed water and the material is larger and larger along with the reduction of the pressure in the still kettle, so that the temperature of the condensed water in the still kettle is converted into cooling water for cooling the material, and the condensed water in the still kettle is pumped by a pumping device (such as a water pump) and then sprayed back to the material in the still kettle to cool the material, the condensed water contacts with hotter materials to vaporize the materials into steam, and the temperature of the materials in the still kettle is reduced, so that the condensed water is used for converting the heat in the materials, the energy-saving purpose is achieved, and the materials are cooled. The temperature difference between the temperature of the condensed water and the temperature of the material is within a controllable range, the quality problem that the material is cracked due to the fact that the temperature difference between the condensed water and the material is too large is solved, the material is cooled by the condensed water with the temperature being more than 100 ℃, and the steam quantity generated by cooling through the water spray with the external lower temperature is more and safer than that generated by cooling through the water spray with the external lower temperature in the prior art.
In addition, the condensed water is not required to be heated by an additional heater, and the steam is recovered and used for cooling the materials, so that the energy is saved. In addition, the condensed water is converted into cooling water for cooling the materials, the condensed water can be heated to generate new steam, and the new steam can be used for heating in other places after being discharged.
Drawings
FIG. 1 is a schematic structural view of a steam curing apparatus for materials according to the present invention.
1 is still kettle, 2 is the leading-in subassembly of steam, 3 is first valve, 4 is temperature sensor, 5 is level sensor, 6 is circulating water pump, 7 is first pipeline, 8 is the second valve, 9 is the spray pipe, 10 is first water tank, 11 is the third valve, 12 is the fourth valve, 13 is the second water tank, 14 is the fifth valve, 15 is the sixth valve, 16 is the jar that catchments, 17 is first manometer, 18 is the thermometer, A is the material, B is the steam extraction subassembly.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 and the following detailed description.
The steam curing device for materials of the invention comprises:
the still kettle 1 is used for keeping condensed water generated in the temperature rising process as the condensed water for cooling the material A during steam exhaust;
a steam introducing unit 2 for introducing steam into the autoclave 1, the steam introducing unit 2 including an introducing pipe and a control valve attached to the introducing pipe.
One end of the first valve 3 is connected with the still kettle 1;
the condensed water conveying assembly is used for extracting condensed water remained in the still kettle and sending the condensed water back to the still kettle to cool the material A, one end of the condensed water conveying assembly is connected with the other end of the first valve, and the other end of the condensed water conveying assembly is connected with the still kettle;
and a temperature sensor 4 for detecting the temperature of the liquid phase and/or the gas phase, wherein the temperature of the liquid phase and/or the gas phase is detected by the temperature sensor 4 so as to control the temperature rise during steam curing and the temperature drop during cooling. The temperature sensor 4 is preferably connected to the autoclave 1.
A liquid level sensor 5 for detecting the level of the condensed water, and the amount of the condensed water in the still kettle 1 is controlled by the liquid level sensor 5. The level sensor 5 may be mounted on the autoclave 1.
The condensate water conveying assembly comprises: circulating water pump 6, first pipeline 7, second valve 8, at least a part is located the spray pipe 9 of autoclaving the cauldron, and circulating water pump 6's one end is connected with first valve 3, and the one end of first pipeline 7 is connected with circulating water pump 6's the other end, and the one end of second valve 8 is connected with the other end of first pipeline 7, and spray pipe 9 is connected with the other end of second valve 8, and spray pipe 9 is preferred to be set up in the top of autoclaving cauldron 1.
When the constant pressure is finished and the steam is exhausted to a certain degree, the condensed water in the still kettle 1 is extracted through the circulating water pump 6 and is sprayed onto the material A through the first pipeline 7, the second valve 8 and the water spraying pipe 9 in sequence to cool the material A, the water spraying pipe 9 is provided with a plurality of water spraying holes or spray headers, and the condensed water is uniformly sprayed out of the water spraying holes or the spray headers.
Preferably, the steam-curing device for the material A further comprises a first water storage assembly for storing condensate water with a third temperature, and the first water storage assembly is connected with the other end of the first valve. The first water storage assembly comprises a first water tank 10 and a third valve 11, one end of the third valve 11 is connected with the first water tank 10, the other end of the third valve 11 is connected with the other end of the first valve 3, or the other end of the third valve 11 is connected with the cooling water conveying assembly, and the other end of the third valve 11 is preferentially connected with the circulating water pump 6.
The first water storage assembly further comprises a fourth valve 12, one end of the fourth valve 12 is connected with the first water tank 10, the other end of the fourth valve 12 is connected with the condensed water conveying assembly, and the other end of the fourth valve 12 is preferentially connected with the first pipeline 7. Through this connection, the condensate water feeding assembly can circulate the water in the first water tank 10 and the water in the autoclave 1 between the first water tank 10 and the autoclave 1.
Preferably, the steam-curing device for the material A further comprises a second water storage assembly for storing condensate water with a fourth temperature, and the second water storage assembly is connected with the other end of the first valve. The second water storage assembly comprises a second water tank 13 and a fifth valve 14, one end of the fifth valve 14 is connected with the second water tank 13, the other end of the fifth valve 14 is connected with the other end of the first valve 3, or the other end of the fifth valve 14 is connected with the cooling water conveying assembly, and the other end of the fifth valve 14 is preferentially connected with the circulating water pump 6.
The second water storage assembly further comprises a sixth valve 15, one end of the sixth valve 15 is connected with the second water tank 13, the other end of the sixth valve 15 is connected with the condensed water conveying assembly, and the other end of the sixth valve 15 is preferentially connected with the first pipeline 7. Through this connection, the condensate water feeding assembly can circulate the water in the second water tank 13 and the water in the autoclave 1 between the second water tank 13 and the autoclave 1.
Preferably, the steam-curing device for the material A further comprises a water collection tank 16, the water collection tank 16 is located between the still kettle 1 and the first valve 3, the water collection tank 16 is respectively connected with the still kettle 1 and the first valve 3, and the water collection tank 16 is communicated with the still kettle 1 and the first valve 3. The water in the still kettle 1 is firstly discharged into the water collecting tank 16, so that the subsequent condensed water conveying assembly can conveniently convey the water in the water collecting tank 16 into the first water tank 10 or the second water tank 13. The temperature sensor 4 may also be mounted on the water collection tank 16.
The condensed water conveying assembly further comprises a first pressure gauge 17 and a temperature gauge 18, the first pressure gauge 17 and the temperature gauge 18 are installed on the first pipeline 7 and located at the downstream of the circulating water pump 6, the pressure and the temperature of the condensed water can be respectively monitored through the first pressure gauge 17 and the temperature gauge 18, and the steam curing process can be safely carried out.
The method for steam curing the material A by adopting the steam curing device comprises the following steps,
s1, feeding: and (3) feeding the material A to be steamed into the still kettle, and closing the kettle door after feeding the material A into the still kettle 1. The material a in this embodiment preferably adopts a building material, and the building material includes a concrete block, a concrete pipe pile, a sand-lime brick, a coal-lime brick, a microporous calcium silicate board, a novel lightweight wall material, a heat-insulating asbestos board, high-strength gypsum, and the like, and preferably a concrete pipe pile (hereinafter referred to as a pipe pile).
S2, temperature and pressure raising: introducing steam into the still kettle 1 to raise the temperature in the still kettle, generating condensed water by heat exchange between the steam and the material in the temperature raising process, discharging a part of the condensed water in the still kettle 1, reserving the other part of the condensed water in the still kettle 1, raising the temperature of the condensed water reserved in the still kettle 1 along with the input of the steam, and finishing the temperature raising and pressure raising when the pressure of the still kettle reaches a first pressure;
preferably, the condensed water at a temperature lower than 100 ℃ is discharged, whereas the condensed water at a temperature higher than 100 ℃ remains in autoclave 1, the first pressure being between 0.4 and 1MPa, depending on the material A itself. Since the material a steamed in this embodiment is described by taking a tubular pile as an example, the first pressure is 1Mpa when the temperature and pressure are raised, and the temperature in the autoclave 1 is 182 to 184 ℃.
In this step, the amount of the condensed water reserved in the autoclave 1 is 60 to 70% of the total amount of the condensed water generated by temperature rise, and preferably, the amount of the condensed water reserved in the autoclave 1 is 70% of the total amount of the condensed water generated by temperature rise.
The condensed water in the autoclave 1 may be discharged in stages, for example, the condensed water discharged from the autoclave 1 has a third temperature, and the condensed water having the third temperature is discharged to the first water tank 10 and kept warm. The third temperature is for example 80-100 ℃.
The condensed water discharged from the autoclave 1 has a fourth temperature, and the condensed water having the fourth temperature is released to the second water tank 13 and kept warm. The fourth temperature is for example below 80 ℃. The water with different temperatures is stored in the corresponding water tanks, so that the subsequent material A is convenient to use in the cooling process.
S3, constant pressure: after the temperature rise and the pressure rise are finished, the pressure of the still kettle 1 is maintained to form a constant pressure process. In the constant pressure process, there may be a case where the pressure value in the autoclave 1 is lower than the set pressure, and when this occurs, steam is supplied to the autoclave 1 to maintain a constant pressure. The duration of the constant pressure is a first time, the first time being 4-6 hours, the first time preferably being 5 hours. After the constant pressure is finished, the temperatures of the gas phase, the liquid phase and the solid phase in the autoclave 1 are equal, that is, the temperatures of the gas phase, the liquid phase and the solid phase are 182 to 184 ℃.
S4, exhausting steam and cooling: after the constant voltage is protected and is pressed, the steam in the cauldron that will evaporate makes the pressure reduction in the cauldron that evaporates, steam is discharged through the steam extraction subassembly B who is connected with still cauldron 1, because material A (for example tubular pile) is the solid, and material A has stored up the heat inside, and the comdenstion water is liquid, therefore, at the steam extraction in-process, the cooling rate of comdenstion water will be faster than material A's cooling rate, thereby when steam extraction to second pressure, begin to take out the comdenstion water in still cauldron 1 and send back again and act on the material in evaporating cauldron 1 and cool down the material, along with going on of continuing of steam extraction, the temperature of comdenstion water reduces thereupon, use such comdenstion water to continue cooling down the material with so circulating.
The temperature of the condensed water is lower than that of the material A, and in the cooling process, the temperature of the condensed water is always lower than that of the material A. The condensed water thus cooled is used to cool the material a.
In step S4, as the pressure in the autoclave is decreased by discharging the steam, a temperature difference is generated between the material and the cooling water, and the temperature of the material is higher than the temperature of the cooling water. For example, when the second pressure is 0.5Mpa, the temperature of the material a is 164 ℃, the temperature of the condensed water is 140 ℃, obviously, the temperature difference between the material a and the condensed water is relatively large, and at this time, the condensed water in the autoclave 1 is pumped out and sent back to the autoclave 1 to act on the material to cool the material.
The pressure in the still kettle 1 is reduced with the continuous discharge of the steam, for example, when the pressure in the still kettle 1 is 0.3Mpa, the temperature of the material A is 130 ℃, the temperature of the condensed water is 102 ℃, and the condensed water in the still kettle 1 is continuously extracted and returned to the still kettle 1 to act on the material to cool the material.
Preferably, in step S2, before the steam is introduced into the autoclave 1, the material a is sprayed with water at a temperature of 70 ℃ or higher to raise the temperature, and when the temperature of the material reaches a1, the introduction of water into the autoclave is stopped. For example, the material A is sprayed with 75 ℃ water to raise the temperature, so that the temperature of the material A is raised quickly, and the water can be condensed water discharged when steam is introduced into another autoclave, thereby saving water and recycling heat energy.
Further, in the steam discharging and cooling process, when the temperature difference between the cooled condensate water and the third temperature is A2, the condensate water at the third temperature is sent into the still kettle 1, and the material A in the still kettle 1 is cooled in a spraying manner. Send into the comdenstion water in the first water tank 10 through the suction and evaporate in the pressure cauldron 1, also can send the comdenstion water in first water tank 10 and the pressure cauldron 1 back to through the suction simultaneously and evaporate in the pressure cauldron 1, the effect cools off material A on the material, preferentially cools down with the mode that sprays to the material in evaporating the pressure cauldron, can increase refrigerated water yield like this, is favorable to accelerating cooling rate. A2 is 0-10 ℃, preferably, A2 preferably adopts 0 ℃, namely when the temperature of the condensed water in the autoclave 1 is reduced to be the same as the temperature of the condensed water in the first water tank 10 (100 ℃), the condensed water in the first water tank 10 is fed into the autoclave 1 to cool the material A.
Among the steam extraction cooling process, when the comdenstion water after the cooling is A3 with the difference in temperature of fourth temperature, send into through the comdenstion water in the suction with second water tank 13 and evaporate in pressure cauldron 1, also can send the comdenstion water in second water tank 13 and the pressure cauldron 1 back to through the suction in evaporating still cauldron 1 simultaneously, the effect cools off material A on the material, cool down the material in evaporating the pressure cauldron with the mode that sprays promptly, can increase refrigerated water yield like this, be favorable to accelerating cooling speed. A3 is 0-30 ℃, preferably A3 is 20 ℃, for example, when the temperature of the condensed water in the autoclave 1 is reduced to 80 ℃ and the temperature of the condensed water in the second water tank 13 is 60 ℃, the condensed water in the second water tank 13 is sent into the autoclave 1 to cool the material A, or the condensed water in the second water tank 13 and the autoclave 1 are sent back into the autoclave 1 by suction, because the temperature difference between the condensed water in the autoclave 1 and the condensed water in the second water tank 13 exists, the condensed water in the autoclave 1 and the condensed water in the second water tank 13 are mixed in the first pipeline 7 during the suction process, and heat exchange is carried out, so that the water temperature is uniform, for example, the temperature of the mixed condensed water is 70 ℃.
In step S4, the second pressure is less than or equal to 70% of the first pressure, and preferably the second pressure is 65% of the first pressure. And (3) exhausting steam and reducing the temperature until the pressure in the autoclave 1 reaches a third pressure, wherein the third pressure is less than or equal to 0.003 MPa. The third pressure in the still 1 is close to zero pressure or zero pressure, and the door of the still can be opened safely.
In the invention, the condensed water absorbs the heat in the steam to become saturated water in the temperature rising process, and the steam in the autoclave 1 is exhausted to release part of the heat in the saturated water to become condensed water, so the heat contained in the condensed water is the recovery of the heat energy of the residual steam. Moreover, the condensed water is not required to be heated by an additional heater, and the condensed water is recovered by steam and used for cooling the material A, so that the energy is saved. In addition, when the material A is cooled by the condensed water, the condensed water can be heated to generate new steam, and the new steam can be used for heating other places after being discharged.
Claims (9)
1. The method for steam curing the material is characterized by comprising the following steps,
s1, feeding: feeding the material to be steamed into a still kettle;
s2, temperature and pressure raising: introducing steam into the autoclave to raise the temperature in the autoclave, generating condensed water by heat exchange between the steam and the material in the temperature raising process, discharging a part of the condensed water in the autoclave, reserving the other part of the condensed water in the autoclave, discharging the condensed water at the temperature lower than 100 ℃, reserving the condensed water at the temperature higher than 100 ℃ in the autoclave, raising the temperature of the condensed water reserved in the autoclave along with the input of the steam, and finishing the temperature raising and pressure raising when the pressure of the autoclave reaches a first pressure;
s3, constant pressure: after the temperature rise and the pressure rise are finished, the pressure of the still kettle is maintained to form a constant pressure process;
s4, exhausting steam and cooling: after the heat preservation and pressure preservation are finished, discharging steam in the still kettle to reduce the pressure in the still kettle, when the pressure in the still kettle is reduced to a second pressure, beginning to extract condensed water in the still kettle, sending the condensed water back into the still kettle and acting on the material to cool the material, and continuously reducing the temperature of the condensed water along with the continuous steam discharge, so that the condensed water is used for continuously cooling the material in a circulating manner;
the first pressure is 0.4-1Mpa, and the second pressure is less than or equal to 70% of the first pressure.
2. The method for steam curing a material according to claim 1, wherein in step S2, the amount of the condensed water remaining in the autoclave is 60-70% of the total amount of the condensed water generated at the time of raising the temperature.
3. The method of claim 1, wherein the condensed water discharged from the autoclave has a third temperature, and the condensed water having the third temperature is discharged into the first water tank and kept warm.
4. The steam curing method of the material as claimed in claim 3, wherein during the steam discharging and temperature reducing process, when the temperature difference between the cooled condensed water and the third temperature is A2, the condensed water in the first water tank is pumped into the still kettle, or the condensed water in the first water tank and the still kettle is simultaneously pumped back into the still kettle, so as to act on the material to cool the material.
5. The method of claim 1, wherein the condensed water discharged from the autoclave has a fourth temperature, and the condensed water having the fourth temperature is discharged to the second water tank and kept warm.
6. The steam curing method for the material as claimed in claim 5, wherein during the steam discharging and temperature reducing process, when the temperature difference between the cooled condensed water and the fourth temperature is A3, the condensed water in the second water tank is sent into the still kettle by suction, or the condensed water in the second water tank and the still kettle are sent back into the still kettle by suction at the same time, and the condensed water acts on the material to cool the material.
7. The method of claim 1, wherein in step S4, the pressure in the autoclave is decreased by discharging the steam, a temperature difference is generated between the material and the condensed water, and the temperature of the material is higher than that of the condensed water.
8. The steam curing method of materials as claimed in claim 1, wherein in step S4, the steam is discharged and the temperature is reduced until the pressure in the autoclave reaches a third pressure, wherein the third pressure is less than or equal to 0.003 MPa.
9. The steam curing method of materials as claimed in any one of claims 1 to 8, wherein in step S2, before the steam is introduced into the autoclave, the material is sprayed with water at a temperature of 70 ℃ or higher to raise the temperature, and when the temperature of the material reaches A1, the introduction of water into the autoclave is stopped.
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| CN116587409B (en) * | 2023-06-15 | 2024-05-17 | 江苏宇航板业有限公司 | Autoclaved curing method for calcium silicate slab |
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