Cement-based material co2 mineralization curing device

Abstract

The utility model relates to the technical field of maintenance kettle, disclose a cement base material CO2 mineralization maintenance equipment, including positive pressure maintenance kettle and cement placement subassembly, the outside of positive pressure maintenance kettle is provided with gas circulating pump, the even setting of gas delivery pipeline all has gas nozzle, the bottom of positive pressure maintenance kettle is provided with CO2 gas inlet and CO2 gas outlet respectively, the side of positive pressure maintenance kettle is provided with the air -ejecting pump, fixedly linked with the connecting pipe between the air inlet pipe and CO2 gas outlet, the air outlet of air -ejecting pump is communicated with the gas recovery capsule through the exhaust pipe, be additionally provided with CO2 concentration detector on the exhaust pipe. The utility model effectively avoided the problem that the cement base material mineralization performance exists difference in different areas due to the temperature distribution uneven condition that may exist because of utilizing cooling pipe to adjust the maintenance kettle temperature.

Description

Technical Field

[0001] This utility model relates to the field of curing tank technology, and in particular to a CO2 mineralization curing device for cement-based materials. Background Technology

[0002] In recent years, the use of CO2 mineralization curing to replace traditional curing techniques for the early curing of cement-based composite materials has gradually become a research hotspot. This technology utilizes CO2 gas to react with alkaline mineral phases (C3S, C2S, etc.) or hydration products (CSH, Aft, CH, etc.) in cement to produce stable products such as calcium carbonate. These products fill the internal pores of the material, refine the pore structure, and thus enable cement-based composite materials to have higher early strength.

[0003] Chinese utility model patent CN216782213U discloses a curing kettle device for CO2 mineralization and curing of building materials. This device utilizes a coil heat exchanger and a CO2 concentration regulating device to adjust the temperature and CO2 concentration inside the curing kettle, thereby improving mineralization efficiency. Regarding the aforementioned related technology, the inventors believe the following defects exist:

[0004] In actual use, the device uses cooling pipes to adjust the temperature of the curing tank, which may result in uneven temperature distribution. This can lead to differences in the performance of cement-based materials after mineralization in different areas. Therefore, we provide a CO2 mineralization curing device for cement-based materials. Utility Model Content

[0005] To address the issue in the aforementioned background technology where uneven temperature distribution may occur due to the use of cooling pipes to regulate the temperature of the curing vessel, leading to differences in the performance of cement-based materials after mineralization in different areas, this invention provides a CO2 mineralization curing device for cement-based materials.

[0006] This utility model is achieved using the following technical solution: a CO2 mineralization curing device for cement-based materials, comprising a positive and negative pressure curing vessel and a cement placement assembly. A gas circulation pump is installed outside the positive and negative pressure curing vessel. An inlet pipe is fixedly connected between the inlet of the gas circulation pump and the positive and negative pressure curing vessel. A gas delivery pipe is fixedly connected inside the positive and negative pressure curing vessel. Gas nozzles are evenly arranged on the gas delivery pipe. An exhaust pipe is fixedly connected between the outlet of the gas circulation pump and the gas delivery pipe. A CO2 inlet and a CO2 outlet are respectively installed at the bottom of the positive and negative pressure curing vessel. The same pressure sensor is installed at the bottom of both the CO2 inlet and the CO2 outlet. A vacuum pump is installed on one side of the positive and negative pressure curing vessel. An inlet pipe is fixedly connected between the inlet of the vacuum pump and the positive and negative pressure curing vessel. A connecting pipe is fixedly connected between the inlet pipe and the CO2 outlet. The outlet of the vacuum pump is connected to a gas recovery bag through an exhaust pipe. A CO2 concentration detector is installed on the exhaust pipe.

[0007] The cement placement assembly includes a base frame, with rollers rotatably connected at equal intervals on both sides of the bottom of the base frame. Two sets of wheel grooves are symmetrically fixedly connected inside the positive and negative pressure curing tank. Two sets of strip frames are symmetrically fixedly connected on the base frame. A bidirectional screw rod is rotatably connected to the inner side of the strip frame. Threaded blocks are threaded to the outer sides of both sides of the bidirectional screw rod. A placement mesh plate is fixedly connected between the two sets of threaded blocks on the same horizontal plane, and a placement mesh plate is fixedly connected between the two sets of strip frames.

[0008] As a further improvement to the above solution, the positive and negative pressure curing vessel is equipped with two sets of humidity sensors and two sets of temperature sensors respectively.

[0009] As a further improvement to the above solution, a high and low temperature regulator and a gas humidity regulator are sequentially installed on the exhaust pipe.

[0010] As a further improvement to the above solution, both the CO2 inlet and the CO2 outlet are equipped with electric pressure control valves.

[0011] As a further improvement to the above solution, the bottom ends of both sets of bidirectional lead screws are coaxially fixedly connected with pulleys, and the two sets of pulleys are connected by a transmission toothed belt.

[0012] As a further improvement to the above solution, a two-way lead screw is rotatably connected to one side of the base frame, and threaded blocks are threaded to both sides of the two-way lead screw. A connecting plate is provided on the lower side of one side of the base frame, and two sets of support wheels are symmetrically rotatably connected to the bottom of the connecting plate. A connecting rod is hinged between the connecting plate and the threaded blocks through a hinge.

[0013] As a further improvement to the above solution, a guide block is fixedly connected to the top of the threaded block 2, and a guide groove is opened at the bottom of the base frame corresponding to the position of the guide block, and the guide groove and the guide block are slidably connected.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model can make the temperature and humidity distribution of the gas inside the curing tank more uniform, avoiding the difference in performance of materials of the same batch after mineralization. Secondly, the gas inside the curing tank after mineralization can be collected and reused through the gas recovery device, preventing CO2 gas from escaping into the atmosphere.

[0016] 2. This utility model drives two sets of bidirectional screws to rotate simultaneously under the transmission cooperation between the pulley and the transmission toothed belt, so that the two sets of placement mesh plates can move simultaneously towards or relative to each other. This makes it easy to adjust the spacing between placement mesh plate one and placement mesh plate two according to the size of the cement-based material, thereby avoiding the cement-based material from being stacked together and affecting its curing effect. It is highly practical. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of the structure of the CO2 mineralization curing equipment for cement-based materials according to this utility model;

[0018] Fig. 2 This is a three-dimensional structural diagram of the cement placement component of this utility model;

[0019] Fig. 3 This is a bottom-view three-dimensional structural diagram of the cement placement component of this utility model.

[0020] Explanation of key symbols:

[0021] 1. Positive and negative pressure curing autoclave; 2. Gas circulation pump; 3. Gas delivery pipeline; 4. Gas nozzle; 5. Gas pressure sensor; 6. Vacuum pump; 7. Gas recovery bladder; 8. CO2 concentration detector; 9. Humidity sensor; 10. Temperature sensor; 11. High and low temperature regulator; 12. Gas humidity regulator; 13. Electric pressure control valve; 101. Base frame; 102. Roller; 103. Wheel groove; 104. Strip frame; 105. Double-acting lead screw one; 106. Threaded block one; 107. Screen plate placement one; 108. Screen plate placement two; 109. Drive toothed belt; 1001. Double-acting lead screw two; 1002. Threaded block two; 1003. Support wheel; 1004. Connecting rod. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0023] Example 1:

[0024] Please combine Figs. 1-3 This embodiment of a CO2 mineralization curing device for cement-based materials includes a positive and negative pressure curing vessel 1. A gas circulation pump 2 is installed outside the positive and negative pressure curing vessel 1. An air inlet pipe is fixedly connected between the air inlet of the gas circulation pump 2 and the positive and negative pressure curing vessel 1. A gas delivery pipe 3 is fixedly connected inside the positive and negative pressure curing vessel 1. Gas nozzles 4, each not less than 10mm, are evenly arranged on the gas delivery pipe 3. An exhaust pipe is fixedly connected between the air outlet of the gas circulation pump 2 and the gas delivery pipe 3. A CO2 air inlet and a CO2 air outlet are respectively provided at the bottom of the positive and negative pressure curing vessel 1. The bottom of the vessel is equipped with the same air pressure sensor 5. A vacuum pump 6 is installed on one side of the positive and negative pressure curing vessel 1. An air inlet pipe is fixedly connected between the air inlet of the vacuum pump 6 and the positive and negative pressure curing vessel 1. A connecting pipe is fixedly connected between the air inlet pipe and the CO2 outlet. The air outlet of the vacuum pump 6 is connected to a gas recovery bag 7 through an exhaust pipe. A CO2 concentration detector 8 is installed on the exhaust pipe. Two sets of humidity sensors 9 and two sets of temperature sensors 10 are respectively installed on the positive and negative pressure curing vessel 1. A high and low temperature regulator 11 and a gas humidity regulator 12 are installed in sequence on the exhaust pipe. An electric pressure control valve 13 is installed on both the CO2 inlet and the CO2 outlet.

[0025] A cement placement assembly for preventing the stacking of cement-based materials includes a base frame 101. Rollers 102 are equidistantly rotatably connected to both sides of the bottom of the base frame 101. Two sets of wheel grooves 103 are symmetrically fixedly connected inside the positive and negative pressure curing kettle 1. Two sets of strip frames 104 are symmetrically fixedly connected to the base frame 101. A bidirectional screw rod 105 is rotatably connected to the inner side of the strip frame 104. Threaded blocks 106 are threadedly connected to the outer sides of both sides of the bidirectional screw rod 105. A placement mesh plate 107 is fixedly connected between the two sets of threaded blocks 106 on the same horizontal plane. A second placement mesh plate 108 is fixedly connected between the two sets of strip frames 104. Pulleys are coaxially fixedly connected to the bottom ends of the two sets of bidirectional screw rods 105. The two sets of pulleys are connected by a transmission toothed belt 109 to facilitate the simultaneous rotation of the two sets of bidirectional screw rods 105.

[0026] The implementation principle of the CO2 mineralization curing equipment for cement-based materials in this embodiment is as follows: First, the base frame 101 is pulled out of the positive and negative pressure curing kettle 1 by the cooperation of the roller 102 and the groove 103. Then, one side of the double-acting screw 105 is rotated. Under the transmission cooperation between the pulley and the transmission toothed belt 109, the two sets of double-acting screws 105 are driven to rotate simultaneously, so that the two sets of placement mesh plates 107 can be moved towards or away from each other at the same time. This makes it easy to adjust the distance between the placement mesh plate 107 and the placement mesh plate 108 according to the size of the cement-based material. To prevent cement-based materials from piling up and affecting their curing effect, the cement-based materials are placed and pushed into the positive and negative pressure curing vessel 1, which is then closed. CO2 gas is then introduced into the positive and negative pressure curing vessel 1 through the CO2 inlet to cure the cement-based materials. When the pressure sensor 5 detects that the CO2 gas pressure in the curing vessel is lower than the required pressure, the control system opens the electric pressure control valve 13 at the inlet to fill the curing vessel with CO2 gas until the required pressure is reached. When the pressure in the curing vessel is too high, the control system opens the outlet valve. The electric pressure control valve 13 at the outlet discharges excess CO2 gas. The vacuum pump 6 can draw the excess CO2 gas into the gas recovery bag 7 for collection. The CO2 concentration detector 8 can detect the concentration of CO2 gas to determine whether the CO2 gas can be reused. The temperature sensor 10 can realize real-time monitoring of the temperature inside the curing vessel. When the internal temperature of the reactor exceeds the required limit, the control system turns on the gas circulation pump 2, and the CO2 gas inside the reactor enters the high and low temperature regulator 11 through the pipeline to regulate the temperature of the CO2 gas. The humidity sensor 9 can realize real-time monitoring of the humidity inside the curing vessel. When the internal humidity of the reactor exceeds the required limit, the control system turns on the gas circulation pump 2 and the gas humidity regulator 12, and the CO2 gas inside the reactor enters the gas humidity regulator 12 through the pipeline to dehumidify the CO2 gas inside the reactor. When the internal humidity of the reactor is lower than the required limit, the control system turns on the gas circulation pump 2 and the gas humidity regulator 12 to humidify the CO2 gas inside the reactor. Finally, the cured cement-based material can be taken out.

[0027] Example 2:

[0028] This embodiment, based on Embodiment 1, further improves upon the following: a bidirectional lead screw 1001 is rotatably connected to one side of the base frame 101; threaded blocks 1002 are threadedly connected to both sides of the bidirectional lead screw 1001; a connecting plate is provided below one side of the base frame 101; two sets of support wheels 1003 are symmetrically rotatably connected to the bottom of the connecting plate; a connecting rod 1004 is hinged between the connecting plate and the threaded blocks 1002 via a hinge; rotating the bidirectional lead screw 1001 drives the two sets of threaded blocks 1002. The two sets of support wheels 1003 move in opposite directions, and the hinge between the connecting plate and the threaded block 1002 and the connecting rod 1004 makes it possible to push the two sets of support wheels 1003 to move vertically downward, so as to support the base frame 101 when it is pulled out of the positive and negative pressure curing vessel 1. The top of the threaded block 1002 is fixedly connected to the guide block, and the bottom of the base frame 101 is provided with a guide groove corresponding to the position of the guide block, and the guide groove and the guide block are slidably connected, which can play a certain guiding role in the horizontal movement of the threaded block 1002.

[0029] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A CO2 mineralization curing device for cement-based materials, characterized in that, include: A positive and negative pressure curing vessel (1) is provided with a gas circulation pump (2) on its exterior. An air inlet pipe is fixedly connected between the air inlet of the gas circulation pump (2) and the positive and negative pressure curing vessel (1). A gas delivery pipe (3) is fixedly connected inside the positive and negative pressure curing vessel (1). Gas nozzles (4) are evenly arranged on the gas delivery pipe (3). An exhaust pipe is fixedly connected between the air outlet of the gas circulation pump (2) and the gas delivery pipe (3). The bottom of the positive and negative pressure curing vessel (1) is respectively provided with The vessel is equipped with a CO2 inlet and a CO2 outlet. The bottom of the CO2 inlet and the CO2 outlet are equipped with the same pressure sensor (5). A vacuum pump (6) is installed on one side of the positive and negative pressure curing vessel (1). An inlet pipe is fixedly connected between the inlet of the vacuum pump (6) and the positive and negative pressure curing vessel (1). A connecting pipe is fixedly connected between the inlet pipe and the CO2 outlet. The outlet of the vacuum pump (6) is connected to a gas recovery bag (7) through an exhaust pipe. A CO2 concentration detector (8) is installed on the exhaust pipe. The cement placement assembly includes a base frame (101), with rollers (102) rotatably connected at equal intervals on both sides of the bottom of the base frame (101). Two sets of wheel grooves (103) are symmetrically fixedly connected inside the positive and negative pressure curing tank (1). Two sets of strip frames (104) are symmetrically fixedly connected on the base frame (101). A bidirectional screw rod (105) is rotatably connected to the inner side of the strip frame (104). Threaded blocks (106) are threadedly connected to the outer sides of both sides of the bidirectional screw rod (105). A placement mesh plate (107) is fixedly connected between the two sets of threaded blocks (106) on the same horizontal plane. A placement mesh plate (108) is fixedly connected between the two sets of strip frames (104).

2. The CO2 mineralization curing equipment for cement-based materials as described in claim 1, characterized in that, The positive and negative pressure curing vessel (1) is equipped with two sets of humidity sensors (9) and two sets of temperature sensors (10).

3. The CO2 mineralization curing equipment for cement-based materials as described in claim 1, characterized in that, The exhaust pipe is equipped with a high and low temperature regulator (11) and a gas humidity regulator (12) in sequence.

4. The CO2 mineralization curing equipment for cement-based materials as described in claim 1, characterized in that, Both the CO2 inlet and the CO2 outlet are equipped with electric pressure control valves (13).

5. The CO2 mineralization curing equipment for cement-based materials as described in claim 1, characterized in that, Both sets of bidirectional lead screws (105) have pulleys fixedly connected to their bottom ends on the same axis, and the two sets of pulleys are connected by a transmission toothed belt (109).

6. The CO2 mineralization curing equipment for cement-based materials as described in claim 1, characterized in that, A two-way lead screw (1001) is rotatably connected to one side of the base frame (101). Threaded blocks (1002) are threaded to the outer sides of both sides of the two-way lead screw (1001). A connecting plate is provided on the lower side of one side of the base frame (101). Two sets of support wheels (1003) are symmetrically rotatably connected to the bottom of the connecting plate. A connecting rod (1004) is hinged between the connecting plate and the threaded blocks (1002) through a hinge.

7. The CO2 mineralization curing equipment for cement-based materials as described in claim 6, characterized in that, The top of the threaded block 2 (1002) is fixedly connected to a guide block, and the bottom of the base frame (101) is provided with a guide groove corresponding to the position of the guide block, and the guide groove and the guide block are slidably connected.

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