A curing apparatus and curing method for aerated concrete

Abstract

The present application relates to the technical field of aerated concrete curing, in particular to an aerated concrete curing device and method, the curing device comprising a steam autoclave, a control system and a CO2 system, the CO2 system comprising an electronic pressure regulating valve; the steam autoclave comprising a cylinder, an air temperature measuring device, a first electronic pressure gauge, a water temperature measuring device, a heating device and an end cover; the heating device heating water or / and gas in the inner cavity of the cylinder to generate water vapor or / and heat CO2 gas; the control system controlling whether the heating device works according to the data detected by the air temperature measuring device or / and the water temperature measuring device; the control system controlling whether CO2 is introduced into the inner cavity according to the curing requirements, and controlling the pressure in the inner cavity through the electronic pressure regulating valve according to the data detected by the first electronic pressure gauge. Through the present curing device and method, the problem of being unable to simultaneously perform autoclaving-carbonization or steam curing-carbonization curing processes can be effectively solved, and the heating speed is easier to control.

Description

Technical Field

[0001] This invention relates to the field of aerated concrete curing technology, and in particular to a curing device and method for aerated concrete. Background Technology

[0002] Autoclaved aerated concrete (AAC) is a new type of building material with advantages such as light weight, good thermal insulation, non-combustibility, and good seismic performance. The curing method of AAC significantly affects its strength, frost resistance, thermal conductivity, drying shrinkage, and other properties. Current research indicates that there are three main curing methods for AAC: autoclaving, atmospheric pressure steam curing (hereinafter referred to as steam curing), and CO2 mineralization curing. Autoclaving involves placing the concrete blank under saturated steam conditions at 175~200℃ and 0.8~1.5MPa, causing a hydrothermal synthesis reaction between siliceous and calcareous materials to produce tobermorite and mono-alkali hydrated calcium silicate, resulting in lightweight, high-strength AAC. Steam curing occurs at atmospheric pressure and 20~100℃, where the cementitious materials hydrate to produce Ca(OH)2, CSH, and AFt; the interweaving of these products contributes to the strength of the concrete. CO2 mineralization curing involves the reaction of Ca(OH)2, AFt, and CSH, the hydration products of cementitious materials, and C3S, C2S, and C4AF from unhydrated cement particles with CO2 to generate CaCO3 crystals, silica gel, and aluminum glue that fill micropores and improve the strength of aerated concrete.

[0003] Currently, autoclaves are used for steam curing, and the process is mature and widely used by manufacturers. Atmospheric steam curing and CO2 mineralization curing are still in the laboratory research stage and have not yet been widely applied industrially. Atmospheric steam curing uses a steam curing chamber. CO2 mineralization curing uses a modified conventional autoclave. The modified autoclave mineralization equipment has the following problems:

[0004] (1) Currently, the maintenance temperature of mineralization equipment is below 100℃;

[0005] (2) The process of autoclaving-carbonation or steam curing-carbonation curing of aerated concrete cannot be carried out.

[0006] Among the existing technologies, there is an invention patent with publication number CN113698229A and publication date of November 26, 2021. This invention patent discloses a process for co-curing fly ash aerated concrete blocks using steam and carbon dioxide. This invention uses two curing technologies, autoclaving and carbon dioxide mineralization, to cure fly ash aerated concrete blocks. Compared with autoclaving alone, autoclaving can transform fly ash into a tobermorite cross-linked structure, providing a basic framework for fly ash aerated concrete blocks. Carbon dioxide mineralization can quickly generate carbonate gel, fill the voids, further enhance the strength of fly ash aerated concrete blocks, reduce steam consumption and improve production efficiency, and achieve the solidification and sequestration of carbon dioxide, reducing greenhouse gas emissions.

[0007] The above technical solution may encounter the following problems during actual use:

[0008] (1) Although this technical solution can achieve autoclaving and CO2 mineralization curing, it cannot achieve both curing methods simultaneously. It can only perform autoclaving first and then CO2 mineralization curing, and cannot perform autoclaving-carbonation or steam curing-carbonation curing processes on aerated concrete at the same time. More specifically, this technical solution requires a CO2 concentration of not less than 80%. If CO2 and water vapor are introduced at the same time, the water vapor content in the reactor will be at most 20%. If the pressure in the reactor is 2 MPa, according to Dalton's law of partial pressures, the water vapor pressure will be 0.4 MPa and the water vapor temperature will be 143℃, which cannot meet the requirements of hydrothermal synthesis reaction.

[0009] (2) During the autoclaving process, this technical solution can only introduce external water vapor into it. However, the water vapor prepared by a general boiler has a temperature exceeding 150°C. If the water vapor is directly introduced into the autoclave, the heating rate is not easy to control, and the aerated concrete is prone to cracking. Summary of the Invention

[0010] To address the aforementioned technical problems, this invention proposes a curing device and method for aerated concrete, which can effectively solve the problem of not being able to simultaneously perform autoclaving-carbonation or steam curing-carbonation curing processes, and the heating rate is easier to control.

[0011] This invention is achieved by adopting the following technical solution:

[0012] A curing device for aerated concrete, characterized in that it comprises an autoclave, a control system, and a CO2 system, wherein the CO2 system includes an electronic pressure regulating valve; the autoclave includes a cylinder, an air temperature measuring device, a first electronic pressure gauge, a water temperature measuring device, a heating device, and an end cap for sealing with the cylinder; the inner wall of the cylinder forms an inner cavity, the inner cavity being provided with a support ring and a perforated plate located on the support ring, the perforated plate being used to place the aerated concrete; the inner cavity below the support ring is used to contain or drain water; the heating device is used to heat the water and / or gas in the inner cavity to generate water vapor and / or heat CO2 gas; the control system is used to control whether the heating device operates based on data detected by the air temperature measuring device and / or the water temperature measuring device; the control system is used to control whether the CO2 system introduces CO2 into the inner cavity according to curing requirements, and to control the pressure in the inner cavity through the electronic pressure regulating valve based on data detected by the first electronic pressure gauge.

[0013] The heating device includes a heating element, a temperature measuring element, and a jacket located outside the cylinder; the jacket contains heat-conducting oil, the heating element is used to heat the heat-conducting oil inside the jacket, and the temperature measuring element is used to measure the temperature of the heat-conducting oil.

[0014] It also includes an insulation layer, which is located on the outside of the jacket.

[0015] It also includes a base for placing the end cap, the inner wall of which is connected to the outer wall of the cylinder, and a limiting member connected to the upper surface of the base; a plurality of first positioning teeth are connected to the outer edge of the end cap, the first positioning teeth are evenly spaced along the circumferential direction of the end cap, and a first tooth groove is formed between two adjacent first positioning teeth; the inner wall of the limiting member is provided with a second tooth groove that matches the first positioning teeth and a second positioning tooth that matches the first tooth groove; the distance between the lower surface of the second positioning tooth and the upper surface of the base is matched with the thickness of the first positioning tooth; an air cavity is provided in the base, the top of the air cavity is provided with an annular air outlet, a sealing ring is installed in the air outlet, and the bottom of the air cavity is provided with an N2 air inlet for introducing N2 at a pressure of 2.0 MPa or higher. The introduction of N2 into the air cavity is used to make the sealing ring push upward against the end cap, so that the sealing ring and the lower surface of the end cap are tightly fitted, and the upper surface of the first positioning tooth and the lower surface of the second positioning tooth are tightly fitted.

[0016] The air chamber is constricted in diameter and faces the air outlet.

[0017] It also includes a safety interlock device, which comprises a second electronic pressure gauge, a microprocessor, a pin, and an actuator. The actuator is electrically connected to the microprocessor. The limiting member has a through hole that matches the pin, and the end cap has a blind hole corresponding to the through hole. The second electronic pressure gauge is used to detect the internal pressure and transmit the pressure signal to the microprocessor. The microprocessor judges the pressure signal: when the internal pressure exceeds the standard atmospheric pressure, the microprocessor sends an interlock signal to the actuator, and the actuator drives the pin through the through hole and into the blind hole, locking the end cap and the limiting member.

[0018] The cylinder is also equipped with a mechanical pressure gauge.

[0019] A method for curing aerated concrete, characterized in that: the curing of aerated concrete using the aforementioned curing equipment specifically includes the following steps:

[0020] S1. Select a curing mode, which includes atmospheric pressure steam curing mode, autoclaving mode, CO2 mineralization curing mode, steam curing-carbonization curing mode, and autoclaving-carbonization curing mode;

[0021] S2. Add heat transfer oil to the jacket and determine whether the curing mode is CO2 mineralization curing mode. If so, drain the water in the inner cavity. If not, inject water into the inner cavity, and the liquid level should not be higher than the height of the support ring. Then place the aerated concrete test block on the hollow plate.

[0022] S3. Seal the end cap and the cylinder together;

[0023] S4. Depending on the different maintenance modes, determine whether CO2 needs to be added. If so, the control system controls the heating device and CO2 system to work, and controls the electronic pressure regulating valve to control the CO2 pressure in the inner cavity. If not, the control system controls the heating device to work.

[0024] S5. The first electronic pressure gauge, temperature measuring element, water temperature measuring device and air temperature measuring device respectively transmit pressure signal and / or temperature signal to the control system. The control system determines whether to continue heating or heat preservation, and whether to add CO2 according to the requirements of the corresponding maintenance mode. If yes, the control system controls the corresponding heating work, heat preservation work or CO2 addition work to be carried out. If no, proceed to step S6.

[0025] S6. After curing is complete, turn off the power and the CO2 system, and purge the gas from the cavity. If the pressure in the cavity is not higher than the standard atmospheric pressure, open the end cover, remove the aerated concrete test block, and the curing is complete.

[0026] Step S3 specifically refers to: inserting the first positioning tooth of the end cap into the second tooth groove from top to bottom, rotating it so that the first positioning tooth and the second positioning tooth are aligned vertically, introducing N2 into the air chamber, lifting the sealing ring by 1~2mm, and pressing the sealing ring upward against the end cap so that the sealing ring and the lower surface of the end cap are tightly fitted together, while the upper surface of the first positioning tooth and the lower surface of the second positioning tooth are tightly fitted together to achieve a seal.

[0027] Step S4 specifically refers to:

[0028] If the selected curing mode is atmospheric pressure steam curing mode, the control system sends a heating signal and transmits the heating signal to the heating device to heat the heat transfer oil. The heat transfer oil transfers heat to the water through the inner wall of the cylinder. The heating rate of the water in the inner cavity is controlled at 3℃ / min, the heat preservation temperature is 80℃, and the heat preservation time is 24h.

[0029] If the selected curing mode is autoclaving, the control system sends a heating signal and transmits the heating signal to the heating device to heat the heat transfer oil. The heat transfer oil transfers heat to the water through the inner wall of the cylinder. The heating rate of the water in the inner cavity is controlled at 1℃ / min, the heat preservation temperature is 190℃, and the heat preservation time is 8h.

[0030] If the selected maintenance mode is CO2 mineralization maintenance mode, the control system controls the CO2 system to introduce CO2 into the inner cavity, and the control system sends a heating signal and transmits the heating signal to the heating device to heat the heat transfer oil. The heat transfer oil transfers heat to the gas CO2 in the inner cavity through the inner wall of the cylinder. The temperature in the inner cavity is controlled at 120℃, the pressure is 0.2MPa, and the heat preservation and pressure holding time is 12h.

[0031] If the selected curing mode is steam curing-carbonization curing mode, the control system sends a heating signal and transmits the signal to the heating device to heat the heat transfer oil. The heat transfer oil transfers heat to the water in the inner cavity through the inner wall of the cylinder. The heating rate of the water in the inner cavity is controlled at 3℃ / min, the holding temperature is 80℃, and the holding time is 24h. After the holding begins, the control system controls the CO2 system to introduce CO2 into the inner cavity, controls the inner cavity pressure at 0.2MPa, and holds the pressure for 12h.

[0032] If the selected curing mode is autoclaving-carbonization curing mode, the control system sends a heating signal and transmits it to the heating element to heat the heat transfer oil. The heat transfer oil transfers heat to the water through the inner wall of the cylinder, controlling the water heating rate in the inner cavity to be 1℃ / min, the holding temperature to be 190℃, and the holding time to be 8h. When the heating is completed and the pressure in the inner cavity is 1.25MPa, the control system controls the CO2 system to introduce CO2 into the inner cavity, so that the inner cavity pressure reaches 1.45MPa, the holding pressure is 1.45MPa, and the holding time is 4h.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. This invention can directly generate water vapor within the curing equipment, eliminating the need for externally prepared water vapor. This makes the heating rate easier to control, reducing the likelihood of cracking in aerated concrete. Furthermore, because water vapor can be directly generated within the curing equipment, CO2 can be directly introduced. The CO2 and water vapor do not interfere with each other, thus meeting the requirements of the hydrothermal synthesis reaction. Ultimately, it can independently achieve autoclaving, atmospheric pressure steam curing, and CO2 mineralization curing of aerated concrete, or it can achieve multi-element coupled reaction curing, satisfying different curing process requirements for aerated concrete.

[0035] Furthermore, during CO2 mineralization curing, this curing equipment can achieve CO2 mineralization reaction of aerated concrete at temperatures above 100°C. In contrast, conventional CO2 mineralization curing is carried out at temperatures below 100°C.

[0036] 2. This invention uses heat transfer oil for heating. The heat transfer oil transfers heat to the water or CO2 gas in the inner cavity through the inner wall of the cylinder, which makes it easier to control the water heating rate and the heat preservation temperature can also be well controlled during the heat preservation stage.

[0037] 3. The insulation layer helps prevent excessive heat loss.

[0038] 4. This invention uses nitrogen gas at pressures of 2.0 MPa or higher to seal the end caps and cylinder, ensuring no air leakage during the curing process and improving the safety performance of the curing equipment.

[0039] 5. The gas chamber is narrowed towards the exhaust port, which makes the nitrogen gas act more effectively on the sealing ring.

[0040] 6. The safety interlock device prevents the end cap from moving and popping out when the pressure is too high, reducing the probability of safety accidents. Furthermore, the safety interlock device is controlled by a separate microprocessor and a second electronic pressure gauge, forming a separate control system that is not linked to the main control system, thus offering better safety performance.

[0041] 7. The present invention also includes a mechanical pressure gauge, which is less prone to damage and provides more accurate readings. It can monitor and verify the data of the first and second electronic pressure gauges. By analyzing the differences between the values, it is possible to determine in a timely manner whether the first and second electronic pressure gauges have malfunctioned, thereby improving the safety of the maintenance equipment.

[0042] 8. The curing method of the present invention can achieve the curing of aerated concrete under different curing modes using the same curing equipment. Attached Figure Description

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, wherein:

[0044] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0045] Figure 2 This is a schematic diagram of the autoclave in this invention;

[0046] Figure 3 This is a top view of the cylindrical body in this invention;

[0047] Figure 4 This is a schematic diagram of the end cap in this invention;

[0048] Marked in the image:

[0049] 1. Autoclave; 101. Jacket; 102. Inner cavity; 103. Heating element; 104. Insulation layer; 105. Support leg; 106. Water temperature measuring device; 107. Drain outlet; 108. Oil drain outlet; 109. Temperature measuring element; 110. Exhaust outlet; 111. Mechanical pressure gauge; 112. Air temperature measuring device; 113. Safety valve; 114. Support ring; 115. Perforated plate; 116. Oil inlet.

[0050] 2. End cap sealing system, 21. Second positioning tooth, 22. Air chamber, 23. First positioning tooth, 24. End cap, 25. Sealing ring, 26. First tooth groove, 27. Base, 28. Limiting component;

[0051] 3. Safety interlock device; 31. Control box; 32. Control box switch; 33. No pressure indicator light; 34. Pressure indicator light; 35. Buzzer alarm; 36. Locking pin; 37. Actuator; 38. Second electronic pressure gauge.

[0052] 4. Control system; 41. Display; 42. Main power switch;

[0053] 5. CO2 system; 51. CO2 cylinder; 52. First pressure reducing valve; 53. Electronic pressure regulating valve; 54. CO2 inlet pipe; 55. First electronic pressure gauge; 56. CO2 inlet.

[0054] 6. N2 system; 61. Second pressure reducing valve; 62. Nitrogen cylinder; 63. N2 inlet pipe; 64. N2 inlet. Detailed Implementation

[0055] Example 1

[0056] As a basic embodiment of the present invention, the present invention includes a curing device for aerated concrete, comprising an autoclave 1, a control system 4, and a CO2 system 5. The autoclave 1 includes a cylinder, a temperature measuring device 112, a first electronic pressure gauge 55, a water temperature measuring device 106, a heating device, and an end cap 24 for sealing with the cylinder. The inner wall of the cylinder forms an inner cavity 102, within which a support ring 114 and a perforated plate 115 located on the support ring 114 are provided. The perforated plate 115 is used to place the aerated concrete. The inner cavity 102 below the support ring 114 is used to contain or drain water. The water can be injected from the top of the cylinder and discharged from the bottom, or it can be injected into the inner cavity 102 from the side wall of the cylinder. The heating device can be a conventional heating element, which can directly heat the water or gas in the inner cavity 102, or simultaneously heat the water and gas in the inner cavity 102, ultimately used to generate water vapor and / or heat CO2 gas, as needed.

[0057] The CO2 system 5 includes an electronic pressure regulating valve 53. This embodiment does not limit the specific structure of the CO2 system 5, as long as it can inject CO2 into the autoclave 1. More specifically, the CO2 system 5 may also include a CO2 inlet pipe 54 and a CO2 storage device. One end of the CO2 inlet pipe 54 can be connected to the CO2 storage device, and the other end can be connected to the autoclave 1.

[0058] The control system 4 can be a conventional PLC. Based on data detected by the air temperature measuring device 112 and / or the water temperature measuring device 106, the control system 4 controls whether the heating device operates; it also controls whether the CO2 system 5 introduces CO2 into the inner cavity 102 according to maintenance requirements; and based on data detected by the first electronic pressure gauge 55, it controls the pressure in the inner cavity 102 via the electronic pressure regulating valve 53.

[0059] Example 2

[0060] As a preferred embodiment of the present invention, please refer to the appendix to the specification. Figures 1-3 This invention includes a curing device for aerated concrete, comprising an autoclave 1, an end cap sealing system 2, a safety interlock device, a control system 4, and a CO2 system 5. The autoclave 1 is vertical and specifically includes a cylinder, an insulation layer 104, support legs 105, an air temperature measuring device 112, a first electronic pressure gauge 55, a water temperature measuring device 106, a heating device, and an end cap 24 that is sealed to the cylinder by the end cap sealing system 2.

[0061] The heating device includes a heating element 103, a temperature measuring element 109, and a jacket 101 located outside the cylinder. The water temperature measuring device 106, the temperature measuring element 109, and the air temperature measuring device 112 can all be thermocouples. The thermocouples have a measuring range of 300℃. The jacket 101 is filled with 3 / 4 of its volume of heat-conducting oil. The jacket 101 has an oil inlet 116 and an oil outlet 108. The heating element 103 can be a heat-conducting oil resistance heating tube with a power of 5KW, used to heat the heat-conducting oil inside the jacket 101. The jacket 101 is designed and operates at atmospheric pressure, with a design temperature of 250℃ and a maximum operating temperature of 240℃. The insulation layer 104 is located outside the jacket 101.

[0062] The autoclave 1 can be made of S31603 austenitic stainless steel. The inner wall of the cylinder forms an inner cavity 102. A support ring 114 is welded to the inner wall of the inner cavity 102, and a perforated plate 115 is placed on the support ring 114. Aerated concrete is placed on the perforated plate 115. Water can be added below the support ring 114 depending on the curing mode. When drainage is needed, it can be discharged through the drain port 107 located at the bottom of the cylinder. When water is needed, it can be added through the open top of the cylinder. The inner cavity 102 is designed to have a pressure of 2.2 MPa and a maximum working pressure of 2.0 MPa; the inner cavity 102 is designed to have a working temperature of 220℃. An exhaust port 110 is also provided on the cylinder.

[0063] A safety valve 113 is also installed on the cylinder. The safety valve 113 is a micro-opening type and is vertically installed on the cylinder of the autoclave 1. The pressure inside the autoclave 1 is reduced by automatically opening the safety valve 113 to discharge the medium.

[0064] The end cap sealing system 2 includes an N2 system 6 and a base 27 for placing the end cap 24. The inner wall of the base 27 is connected to the outer wall of the cylinder, and a limiting member 28 is also connected to the upper surface of the base 27. A plurality of first positioning teeth 23 are connected to the outer edge of the end cap 24. The first positioning teeth 23 are evenly spaced along the circumferential direction of the end cap 24, and a first tooth groove 26 is formed between two adjacent first positioning teeth 23. The end cap 24 and the first positioning teeth 23 are integrally formed. The inner wall of the limiting member 28 is provided with a second tooth groove that matches the first positioning teeth 23 and a second positioning tooth 21 that matches the first tooth groove 26. The distance between the lower surface of the second positioning tooth 21 and the upper surface of the base 27 matches the thickness of the first positioning tooth 23. The base 27, the limiting member 28, and the second positioning tooth 21 can be integrally formed.

[0065] The base 27 also includes a gas chamber 22, with an annular outlet at the top and the chamber tapering towards the outlet. A sealing ring 25 is fitted inside the outlet, and an N2 inlet 64 for introducing nitrogen gas at pressures above 2.0 MPa is located at the bottom of the gas chamber 22. The N2 system 6 can consist of a nitrogen cylinder 62, a second pressure reducing valve 61, and an N2 inlet pipe 63. One end of the N2 inlet pipe 63 is connected to the N2 inlet 64, and the other end is connected to the nitrogen cylinder 62. The N2 system 6 introduces high-pressure N2 into the gas chamber 22, lifting the sealing ring 25 by 1-2 mm. The sealing ring 25 presses upward against the end cap 24, ensuring a tight fit between the sealing ring 25 and the lower surface of the end cap 24. Furthermore, the upper surface of the first positioning tooth 23 and the lower surface of the second positioning tooth 21 are also tightly fitted together, achieving a seal.

[0066] The safety interlock device consists of a pin 36, a second electronic pressure gauge 38, an actuator 37, a data transmission line, a control box switch 32, and a control box 31. The control box 31 is also equipped with a pressure indicator light 34, a buzzer alarm 35, and a no-pressure indicator light 33. A microprocessor is located inside the control box 31. The actuator 37 can be a conventional mechanical structure such as a cylinder. The limiting member 28 has a through hole that matches the pin 36, and the end cap 24 has a blind hole corresponding to the through hole. The second electronic pressure gauge 38 is used to detect the pressure in the inner cavity 102 of the autoclave 1. The pressure signal is transmitted to the microprocessor through the data transmission line. The microprocessor judges the electrical signal: when the pressure in the autoclave 1 is lower than the standard atmospheric pressure, the "no pressure indicator 33" on the control box 31 lights up; when the pressure exceeds the standard atmospheric pressure, the "pressure indicator 34" on the control box 31 lights up. At the same time, the microprocessor sends an interlock signal to the actuator 37, and the pin 36 automatically locks the end cover 24 and the limit piece 28 to ensure the safe operation of the maintenance equipment; when the pressure inside the autoclave exceeds 2.0 MPa, the buzzer alarm 35 sounds.

[0067] The cylinder is also equipped with a mechanical pressure gauge 111, which has a range of 0~2.5MPa. This mechanical pressure gauge 111 allows for verification of the detection data from the first electronic pressure gauge 55 and the second electronic pressure gauge 38, enabling timely determination of whether any malfunctions have occurred, thus improving the safety of the maintenance equipment.

[0068] The CO2 system 5 consists of a CO2 cylinder 51, a first pressure reducing valve 52, an electronic pressure regulating valve 53, a CO2 inlet pipe 54, and a CO2 inlet 56. The electronic pressure gauge has a range of 0~2.5MPa. The CO2 inlet 56 is located on the cylinder body. One end of the CO2 inlet pipe 54 is connected to the CO2 inlet 56, and the other end is connected to the CO2 cylinder 51.

[0069] The control system 4 may include a microcontroller, a display 41, and a main power switch 42 for power supply. The microcontroller controls whether the heating device operates based on data detected by the air temperature measuring device 112 and / or the water temperature measuring device 106; the microcontroller also controls whether the CO2 system 5 introduces CO2 into the inner cavity 102 according to maintenance requirements, and controls the pressure in the inner cavity 102 through the electronic pressure regulating valve 53 based on data detected by the first electronic pressure gauge 55. The circuit and parameter control principles are existing technology and will not be described in detail here.

[0070] Example 3

[0071] Using the curing equipment in Example 2, aerated concrete is subjected to atmospheric pressure steam curing. The curing method specifically includes the following steps:

[0072] S1. Select the atmospheric pressure steam curing mode under 80℃ steam curing conditions.

[0073] S2. Add heat transfer oil to jacket 101 and inject 10L of water into inner cavity 102 so that the liquid level is not higher than the height of support ring 114; then place the aerated concrete test block on the hollow plate 115.

[0074] S3. Seal the end cap 24 and the cylinder together. More specifically, after inserting the first positioning tooth 23 of the end cap 24 into the second tooth groove from top to bottom, rotate it so that the first positioning tooth 23 and the second positioning tooth 21 are aligned vertically. Introduce N2 into the air chamber 22 to lift the sealing ring 25 by 1~2mm. The sealing ring 25 presses upward against the end cap 24, so that the sealing ring 25 and the lower surface of the end cap 24 are tightly fitted together. At the same time, the upper surface of the first positioning tooth 23 and the lower surface of the second positioning tooth 21 are tightly fitted together to achieve a seal.

[0075] S4. Turn on the main power switch 42 and select the atmospheric pressure steam curing mode on the display 41 to enter the settings interface. On the settings interface, set the water heating rate in the inner cavity 102 to 3℃ / min, the holding temperature to 80℃, and the holding time to 24h. After setting the parameters, click the start button. The microcontroller controls the heating device to work. The microcontroller sends a heating signal, which is transmitted to the heat transfer oil resistance heating tube via the data cable, heating the heat transfer oil. The heat transfer oil then transfers heat to the water through the inner wall of the cylinder.

[0076] S5. Temperature measuring device 109, water temperature measuring device 106 and air temperature measuring device 112 respectively transmit temperature signals to the microcontroller. The microcontroller determines whether to continue heating or heat preservation based on the collected temperature signals. If yes, the microcontroller controls the corresponding heating or heat preservation work. If no, proceed to step S6.

[0077] S6. After curing, turn off the main power switch 42, close the N2 inlet 64, and open the exhaust port 110. Since the saturated water vapor pressure at 80℃ is 0.05MPa, the safety interlock device is not activated. Therefore, after venting, the end cover 24 can be opened directly to remove the test block, and the curing is complete.

[0078] Example 4

[0079] Using the curing equipment in Example 2, autoclaved aerated concrete is subjected to autoclaving, specifically including the following steps:

[0080] S1. Select the autoclaving mode under saturated steam conditions at 190℃.

[0081] S2. Add heat transfer oil to jacket 101, then inject 20L of water into inner cavity 102, with the liquid level not higher than the height of support ring 114; then place the aerated concrete test block on the perforated plate 115.

[0082] S3. Seal the end cap 24 and the cylinder together. More specifically, after inserting the first positioning tooth 23 of the end cap 24 into the second tooth groove from top to bottom, rotate it so that the first positioning tooth 23 and the second positioning tooth 21 are aligned vertically. Introduce N2 into the air chamber 22 to lift the sealing ring 25 by 1~2mm. The sealing ring 25 presses upward against the end cap 24, so that the sealing ring 25 and the lower surface of the end cap 24 are tightly fitted together. At the same time, the upper surface of the first positioning tooth 23 and the lower surface of the second positioning tooth 21 are tightly fitted together to achieve a seal.

[0083] S4. Turn on the main power switch 42, select the autoclaving mode on the display 41 to enter the settings interface. On the settings interface, set the water heating rate in the inner cavity 102 to 1℃ / min, the holding temperature to 190℃, and the holding time to 8 hours. After setting the parameters, click the start button. The microcontroller controls the heating device to work. The microcontroller sends a heating signal, which is transmitted to the heat transfer oil resistance heating tube via the data cable, heating the heat transfer oil. The heat transfer oil then transfers heat to the water through the inner wall of the cylinder.

[0084] S5. Temperature measuring device 109, water temperature measuring device 106 and air temperature measuring device 112 respectively transmit temperature signals to the microcontroller. The microcontroller determines whether to continue heating or heat preservation based on the collected temperature signals. If yes, the microcontroller controls the corresponding heating or heat preservation work. If no, proceed to step S6.

[0085] S6. After maintenance is completed, turn off the main power switch 42, close the N2 air inlet 64, open the exhaust port 110, and wait for the no-pressure indicator light 33 of the safety interlock device 3 to light up and the pin 36 to retract before opening the end cover 24, taking out the test block, and completing the maintenance.

[0086] Example 5

[0087] Using the curing equipment in Example 2, CO2 mineralization curing of aerated concrete is carried out, specifically including the following steps:

[0088] S1. Select the CO2 mineralization curing mode under CO2 conditions of 120℃ and 0.2MPa.

[0089] S2. Add heat-conducting oil to the jacket 101, drain the water in the inner cavity 102 through the drain outlet 107, and place the aerated concrete test block on the perforated plate 115.

[0090] S3. Seal the end cap 24 and the cylinder together. More specifically, after inserting the first positioning tooth 23 of the end cap 24 into the second tooth groove from top to bottom, rotate it so that the first positioning tooth 23 and the second positioning tooth 21 are aligned vertically. Introduce N2 into the air chamber 22 to lift the sealing ring 25 by 1~2mm. The sealing ring 25 presses upward against the end cap 24, so that the sealing ring 25 and the lower surface of the end cap 24 are tightly fitted together. At the same time, the upper surface of the first positioning tooth 23 and the lower surface of the second positioning tooth 21 are tightly fitted together to achieve a seal.

[0091] S4. Turn on the main power switch 42 and select the CO2 mineralization curing mode on the display 41 to enter the settings interface. On the settings interface, set the air temperature in the inner cavity 102 to 120℃, the pressure to 0.2MPa, and the heat preservation and pressure holding time to 12 hours. After setting the parameters, click the start button. The microcontroller controls the CO2 system 5 to introduce CO2 into the inner cavity 102 and controls the issuance of a heating signal. The data cable transmits the heating signal to the heat transfer oil resistance heating tube, heating the heat transfer oil. The heat transfer oil transfers heat to the gaseous CO2 in the inner cavity 102 through the inner wall of the cylinder. Furthermore, the microcontroller transmits the pressure signal to the electronic pressure regulating valve 53 via the data cable to control the CO2 pressure inside the reactor.

[0092] S5. The first electronic pressure gauge 55, the temperature measuring element 109, and the air temperature measuring device 112 transmit the pressure signal and temperature signal to the microcontroller respectively. The microcontroller determines whether to continue heating or heat preservation, and whether to add CO2. If yes, the control system 4 controls the corresponding heating, heat preservation, or CO2 addition work. If no, proceed to step S6.

[0093] S6. After curing is completed, turn off the power, close the N2 inlet 64 and CO2 inlet 56, open the exhaust port 110, and wait for the no-pressure indicator light 33 of the safety interlock device to light up and the pin 36 to retract before opening the end cover 24, taking out the test block, and completing the curing.

[0094] Example 6

[0095] Using the curing equipment in Example 2, the aerated concrete is subjected to steam curing-carbonation curing, specifically including the following steps:

[0096] S1. Select the steam curing-carbonization curing mode with a CO2 partial pressure of 0.2MPa under saturated steam conditions at 80℃.

[0097] S2. Add heat transfer oil to jacket 101, inject 10L of water into inner cavity 102, the liquid level should not be higher than the height of support ring 114; then place the aerated concrete test block on the hollow plate 115.

[0098] S3. Seal the end cap 24 and the cylinder together. More specifically, after inserting the first positioning tooth 23 of the end cap 24 into the second tooth groove from top to bottom, rotate it so that the first positioning tooth 23 and the second positioning tooth 21 are aligned vertically. Introduce N2 into the air chamber 22 to lift the sealing ring 25 by 1~2mm. The sealing ring 25 presses upward against the end cap 24, so that the sealing ring 25 and the lower surface of the end cap 24 are tightly fitted together. At the same time, the upper surface of the first positioning tooth 23 and the lower surface of the second positioning tooth 21 are tightly fitted together to achieve a seal.

[0099] S4. Turn on the main power switch 42 and select the steam curing-carbonization curing mode on the display 41 to enter the settings interface. On the settings interface, set the water heating rate in the inner cavity 102 to 3℃ / min, the holding temperature to 80℃, and the holding time to 24h; set the CO2 partial pressure to 0.2MPa, the start time for aeration to be the start time for holding, and the pressure holding time to 12h. After setting the parameters, click the start button to start the equipment. After setting the parameters and clicking the start button, the microcontroller controls the heating device. The microcontroller sends a heating signal, which is transmitted to the heat transfer oil resistance heating tube via the data cable, heating the heat transfer oil. The heat transfer oil then transfers heat to the water through the inner wall of the cylinder. When the holding temperature is reached, the microcontroller controls the CO2 system 5 to introduce CO2 into the inner cavity 102. The microcontroller also transmits the pressure signal to the electronic pressure regulating valve 53 via the data cable to control the CO2 pressure inside the vessel.

[0100] S5. The first electronic pressure gauge 55, temperature measuring element 109, water temperature measuring device 106 and air temperature measuring device 112 respectively transmit pressure signals and temperature signals to the microcontroller. The microcontroller determines whether to continue heating or heat preservation, and whether to add CO2, according to the requirements of the corresponding maintenance mode. If yes, the control system 4 controls the corresponding heating work, heat preservation work or CO2 addition work. If no, proceed to step S6.

[0101] S6. After curing is completed, turn off the power, close the N2 inlet 64 and CO2 inlet 56, and the exhaust port 110. After the safety interlock device no-pressure indicator light 33 is on and the pin 36 is retracted, open the end cover 24, take out the test block, and complete the curing.

[0102] In this embodiment, the time for CO2 to be introduced into the inner cavity 102, the holding time, and the pressure can be flexibly adjusted according to maintenance requirements.

[0103] Example 7

[0104] Using the curing equipment in Example 2, autoclaving-carbonation curing of aerated concrete is carried out, specifically including the following steps:

[0105] S1. Select the autoclaving-carbonization curing mode with a CO2 partial pressure of 0.2 MPa under saturated steam conditions at 90℃.

[0106] S2. Add heat transfer oil to the jacket 101, and inject 20L of 20℃ water into the inner cavity 102, with the liquid level not higher than the height of the support ring 114; then place the aerated concrete test block on the hollow plate 115.

[0107] S3. Seal the end cap 24 and the cylinder together. More specifically, after inserting the first positioning tooth 23 of the end cap 24 into the second tooth groove from top to bottom, rotate it so that the first positioning tooth 23 and the second positioning tooth 21 are aligned vertically. Introduce N2 into the air chamber 22 to lift the sealing ring 25 by 1~2mm. The sealing ring 25 presses upward against the end cap 24, so that the sealing ring 25 and the lower surface of the end cap 24 are tightly fitted together. At the same time, the upper surface of the first positioning tooth 23 and the lower surface of the second positioning tooth 21 are tightly fitted together to achieve a seal.

[0108] S4. Turn on the main power switch 42 and select the autoclaving-carbonization curing mode on the display 41 to enter the settings interface. On the settings interface, set the water heating rate in the inner cavity 102 to 1℃ / min, the heating time to 170min, the holding temperature to 190℃, and the holding time to 8h. 170min after curing begins and the pressure in the inner cavity 102 reaches 1.25MPa, introduce CO2 to raise the inner tank pressure to 1.45MPa, maintain the pressure at 1.45MPa, and hold for 4h. After setting the parameters, click the start button. The microcontroller controls the heating device to operate. The microcontroller sends a heating signal, which is transmitted via data cable to the heat transfer oil resistance heating tube, heating the heat transfer oil. The heat transfer oil then transfers heat to the water through the inner wall of the cylinder. After heating is complete, the microcontroller controls the CO2 system 5 to introduce CO2 into the inner cavity 102. The microcontroller also transmits the pressure signal via data cable to the electronic pressure regulating valve 53 to control the CO2 pressure inside the vessel.

[0109] S5. The first electronic pressure gauge 55, temperature measuring element 109, water temperature measuring device 106 and air temperature measuring device 112 respectively transmit pressure signal and temperature signal to the control system 4. The control system 4 determines whether to continue heating or heat preservation, and whether to add CO2. If yes, the control system 4 controls the corresponding heating work, heat preservation work or CO2 addition work to be carried out. If no, proceed to step S6.

[0110] S6. After curing is completed, turn off the power, close the N2 inlet 64 and CO2 inlet 56, open the exhaust port 110, and wait for the no-pressure indicator light 33 of the safety interlock device to light up and the pin 36 to retract before opening the end cover 24, taking out the test block, and completing the curing.

[0111] In this embodiment, the time for CO2 to be introduced into the inner cavity 102, the holding time, and the pressure can be flexibly adjusted according to maintenance requirements.

[0112] In summary, any other corresponding modifications made by those skilled in the art after reading this invention document, without requiring creative mental effort, based on the technical solutions and concepts of this invention, are all within the scope of protection of this invention.

Claims

1. A curing device for aerated concrete, characterized in that: The system includes an autoclave (1), a control system (4), and a CO2 system (5), wherein the CO2 system (5) includes an electronic pressure regulating valve (53); the autoclave (1) includes a cylinder, an air temperature measuring device (112), a first electronic pressure gauge (55), a water temperature measuring device (106), a heating device, and an end cap (24) for sealing with the cylinder; the inner wall of the cylinder forms an inner cavity (102), and the inner cavity (102) is provided with a support ring (114) and a perforated plate (115) located on the support ring (114), wherein the perforated plate (115) is used to place aerated concrete; the inner cavity (102) below the support ring (114) is used to contain or drain water; the heating device is used to heat the water and / or gas in the inner cavity (102) to generate water vapor or / and heating CO2 gas; the control system (4) is used to control whether the heating device works based on the data detected by the air temperature measuring device (112) or / and the water temperature measuring device (106); the control system (4) is used to control whether the CO2 system (5) introduces CO2 into the inner cavity (102) according to the maintenance requirements, and to control the pressure in the inner cavity (102) through the electronic pressure regulating valve (53) based on the data detected by the first electronic pressure gauge (55); the heating device includes a heating element (103), a temperature measuring element (109) and a jacket (101) located outside the cylinder; the jacket (101) contains heat transfer oil, the heating element (103) is used to heat the heat transfer oil in the jacket (101), and the temperature measuring element (109) is used to measure the temperature of the heat transfer oil.

2. The curing equipment for aerated concrete according to claim 1, characterized in that: It also includes an insulation layer (104) located outside the jacket (101).

3. A curing device for aerated concrete according to claim 1 or 2, characterized in that: It also includes a base (27) for placing the end cap (24), the inner wall of the base (27) being connected to the outer wall of the cylinder, and a limiting member (28) being connected to the upper surface of the base (27); a plurality of first positioning teeth (23) are connected to the outer edge of the end cap (24), the first positioning teeth (23) being evenly spaced along the circumferential direction of the end cap (24), and a first tooth groove (26) being formed between two adjacent first positioning teeth (23); the inner wall of the limiting member (28) is provided with a second tooth groove matching the first positioning teeth (23) and a second positioning tooth (21) matching the first tooth groove (26); the second positioning tooth (21) The distance between the lower surface of the base (27) and the upper surface of the base (27) is matched with the thickness of the first positioning tooth (23); the base (27) is provided with an air chamber (22), the top of the air chamber (22) is provided with an annular air outlet, the air outlet is provided with a sealing ring (25), the bottom of the air chamber (22) is provided with an N2 inlet (64) for introducing N2 of 2.0MPa or higher, the N2 is introduced into the air chamber (22) to make the sealing ring (25) push against the end cap (24) upward, so that the sealing ring (25) and the lower surface of the end cap (24) are tightly fitted, and the upper surface of the first positioning tooth (23) and the lower surface of the second positioning tooth (21) are tightly fitted.

4. The curing equipment for aerated concrete according to claim 3, characterized in that: The air chamber (22) is constricted in diameter toward the air outlet.

5. The curing equipment for aerated concrete according to claim 4, characterized in that: It also includes a safety interlock device, which includes a second electronic pressure gauge (38), a microprocessor, a pin (36), and an actuator (37). The actuator (37) is electrically connected to the microprocessor. The limiting member (28) has a through hole that matches the pin (36), and the end cap (24) has a blind hole corresponding to the through hole. The second electronic pressure gauge (38) is used to detect the pressure in the inner cavity (102) and transmit the pressure signal to the microprocessor. The microprocessor judges the pressure signal: when the pressure inside the cylinder exceeds the standard atmospheric pressure, the microprocessor sends an interlock signal to the actuator (37), and the actuator (37) drives the pin (36) to pass through the through hole and insert into the blind hole, locking the end cap (24) and the limiting member (28).

6. The curing equipment for aerated concrete according to claim 5, characterized in that: The cylinder is also equipped with a mechanical pressure gauge (111).

7. A method for curing aerated concrete, characterized in that: The curing of aerated concrete using the curing equipment described in claim 6 specifically includes the following steps: S1. Select a curing mode, which includes atmospheric pressure steam curing mode, autoclaving mode, CO2 mineralization curing mode, steam curing-carbonization curing mode, and autoclaving-carbonization curing mode; S2. Add heat transfer oil to the jacket (101) and determine whether the curing mode is CO2 mineralization curing mode. If so, drain the water in the inner cavity (102). If not, inject water into the inner cavity (102) and the liquid level should not be higher than the height of the support ring (114). Then place the aerated concrete test block on the hollow plate (115). S3. Seal the end cap (24) and the cylinder together; S4. Based on different maintenance modes, determine whether CO2 needs to be added. If so, the control system (4) controls the heating device and CO2 system (5) to work, and controls the electronic pressure regulating valve (53) to control the CO2 pressure in the inner cavity (102). If not, the control system (4) controls the heating device to work. S5. The first electronic pressure gauge (55), temperature measuring element (109), water temperature measuring device (106) and air temperature measuring device (112) respectively transmit pressure signals and / or temperature signals to the control system (4). The control system (4) determines whether to continue heating or heat preservation, and whether to add CO2, according to the requirements of the corresponding maintenance mode. If yes, the control system (4) controls the corresponding heating work, heat preservation work or CO2 addition work to be carried out. If no, proceed to step S6. S6. After curing is completed, turn off the power, turn off the CO2 system (5), and exhaust the gas in the inner cavity (102). If the pressure in the inner cavity (102) is not higher than the standard atmospheric pressure, open the end cover (24), take out the aerated concrete test block, and complete the curing.

8. A method for curing aerated concrete according to claim 7, characterized in that: Step S3 specifically refers to: inserting the first positioning tooth (23) of the end cap (24) into the second tooth groove from top to bottom, rotating it so that the first positioning tooth (23) and the second positioning tooth (21) are aligned vertically, introducing N2 into the air chamber (22), lifting the sealing ring (25) by 1~2mm, and pressing the sealing ring (25) upward against the end cap (24) so ​​that the sealing ring (25) and the lower surface of the end cap (24) are tightly fitted, and at the same time, the upper surface of the first positioning tooth (23) and the lower surface of the second positioning tooth (21) are tightly fitted to achieve sealing.

9. A method for curing aerated concrete according to claim 7, characterized in that: Step S4 specifically refers to: If the selected maintenance mode is atmospheric pressure steam maintenance mode, the control system (4) sends a heating signal and transmits the heating signal to the heating device (103) to heat the heat transfer oil. The heat transfer oil transfers heat to the water through the inner wall of the cylinder. The heating rate of the water in the inner cavity (102) is controlled to be 3℃ / min, the heat preservation temperature is 80℃, and the heat preservation time is 24h. If the selected curing mode is autoclaving, the control system (4) sends a heating signal and transmits the heating signal to the heating device (103) to heat the heat transfer oil. The heat transfer oil transfers heat to the water through the inner wall of the cylinder. The heating rate of the water in the inner cavity (102) is controlled to be 1℃ / min, the heat preservation temperature is 190℃, and the heat preservation time is 8h. If the selected maintenance mode is CO2 mineralization maintenance mode, the control system (4) controls the CO2 system (5) to introduce CO2 into the inner cavity (102), and the control system (4) sends a heating signal and transmits the heating signal to the heating device (103) to heat the heat transfer oil. The heat transfer oil transfers heat to the gas CO2 in the inner cavity (102) through the inner wall of the cylinder. The temperature in the inner cavity (102) is controlled to be 120℃, the pressure is 0.2MPa, and the heat preservation and pressure preservation time is 12h. If the selected curing mode is steam curing-carbonization curing mode, the control system (4) sends a heating signal and transmits the heating signal to the heating device (103) to heat the heat transfer oil. The heat transfer oil transfers heat to the water in the inner cavity (102) through the inner wall of the cylinder. The heating rate of the water in the inner cavity (102) is controlled to be 3℃ / min, the heat preservation temperature is 80℃, and the heat preservation time is 24h. After the heat preservation starts, the control system (4) controls the CO2 system (5) to introduce CO2 into the inner cavity (102) and controls the pressure of the inner cavity (102) to be 0.2MPa, and maintains the pressure for 12h. If the selected curing mode is autoclaving-carbonization curing mode, the control system (4) sends a heating signal and transmits the heating signal to the heating element to heat the heat transfer oil. The heat transfer oil transfers heat to the water through the inner wall of the cylinder. The heating rate of the water in the inner cavity (102) is controlled to be 1℃ / min, the heat preservation temperature is 190℃, and the heat preservation time is 8h. When the heating is completed and the pressure in the inner cavity (102) is 1.25MPa, the control system (4) controls the CO2 system (5) to introduce CO2 into the inner cavity (102) so that the pressure in the inner cavity (102) reaches 1.45MPa, the pressure preservation pressure is 1.45MPa, and the pressure preservation time is 4h.

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