A lightweight high-porosity carbide slag clay permeable composite brick 2 Gas calcination intensification device

Abstract

The invention relates to the technical field of composite brick calcination and strengthening, and discloses a CO2 gas calcination and strengthening device for lightweight, high-porosity, carbide slag and clay water-permeable composite bricks. The closing mechanisms connected at the four corners of the calcination chamber sealing shell realize the closing and opening of the calcination chamber sealing shell and the calcination chamber outer shell under the control of a PLC controller; the sensor module is used to detect the temperature and CO2 concentration inside the calcination chamber outer shell; the hot blast furnace is provided with an electric heating core whose start and stop, heating power and heating time are controlled by a PLC controller. The invention controls the calcination temperature by dynamically controlling the CO2 gas temperature, and uses a negative pressure mold to guide the high-temperature hot air to pass through the inside of the sample brick, thereby realizing uniform distribution and effective transfer of heat; and spraying strengthening liquid at a suitable temperature, and using airflow to guide the strengthening liquid to achieve deep penetration, thereby promoting the degree of material strengthening, and helping to form a denser and stronger brick structure; the rapid circulation of CO2 gas can eliminate the volume instability factor of the sample brick.

Description

Technical Field

[0001] The invention relates to the technical field of composite brick calcination and strengthening, in particular to a CO2 gas calcination and strengthening device for lightweight and high-porosity carbide slag clay water-permeable composite bricks. Background Art

[0002] Permeable bricks mainly made of clay are widely used in urban roads, sidewalks, squares and other places, and are favored for their good permeability and environmental protection. However, there are still several challenges in their production and use. The calcination process of clay permeable bricks has a significant impact on the density and permeability of the brick body. Improper temperature control during calcination can easily cause cracks. The temperature needs to be precisely controlled during calcination to avoid insufficient strength or substandard permeability, and the challenge of uneven heat distribution needs to be overcome.

[0003] Solid waste materials such as carbide slag, with their rich calcium content (mainly calcium oxide), show significant advantages in the calcination process of clay bricks. They not only promote the maturation and densification of clay, but also reduce pores, enhance the density and physical strength of bricks through complex reactions with silicon and aluminum in clay at high temperatures, and accelerate the stabilization process of materials. At the same time, the chemical reaction of calcium oxide with clay components produces hardening substances such as hydrated calcium silicate, which greatly improves the hardness and compressive strength of bricks, and forms a hard protective layer on the surface of bricks, enhancing wear resistance and durability. In addition, the right amount of calcium oxide can also optimize calcination performance, reduce calcination temperature requirements, save energy and reduce costs, while improving heat transfer and gas emission efficiency, ensuring the uniformity and stability of the calcination process, and improving product quality. However, it is worth noting that the presence of excessive calcium oxide may become a hidden danger, because it may absorb moisture and cause local volume expansion of the brick, triggering lime bursting, which is more serious when the CaO component is unevenly distributed or the particles are large. This will seriously damage the quality and appearance of the calcined bricks and even cause damage to the bricks.

[0004] The shortcomings of existing clay brick calcining devices:

[0005] (1) Temperature control is not precise enough and lacks dynamic adjustment capability:

[0006] Existing clay brick calcining equipment often uses more traditional control methods for temperature control, which makes it difficult to achieve dynamic temperature regulation during the calcining process. This may cause uneven heating of the brick during the calcining process, affecting the overall quality and performance of the brick.

[0007] (2) Separation of drying and calcination processes:

[0008] In the traditional clay brick production process, drying and calcining are two relatively independent steps that need to be carried out in different equipment. This not only increases the production cycle and cost, but may also lead to a decline in brick quality due to insufficient drying or mismatched calcining temperatures.

[0009] (3) Lack of internal hot air penetration and strengthening mechanism:

[0010] Most existing calcining equipment relies on external heat sources to heat the bricks, which makes it difficult to ensure that the heat can penetrate evenly and effectively into the bricks, which may lead to temperature gradients inside the bricks and affect the calcining effect.

[0011] (4) Lack of means to optimize surface strengthening and volume stability:

[0012] After calcination, traditional calcining equipment often lacks further treatment of the brick surface and volume stability, which may cause the brick to wear, crack and other problems during use.

[0013] (5) The yield and performance improvements are limited.

[0014] Due to the above shortcomings, the yield and performance improvement of existing clay brick calcining equipment are often limited. To this end, we have introduced a CO2 gas calcination strengthening device for lightweight, high-porosity carbide slag clay permeable composite bricks. Summary of the invention

[0015] The object of the present invention is to provide a CO2 gas calcination strengthening device for a lightweight, high-porosity, carbide slag clay permeable composite brick, so as to solve the problems raised in the above-mentioned background technology.

[0016] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a CO2 gas calcination strengthening device for lightweight high-porosity carbide slag clay permeable composite bricks, comprising a negative pressure pump, a hot blast furnace, a gas tank, a calcination chamber shell and a calcination chamber sealing shell connected to the front end of the calcination chamber shell, wherein the closing mechanism connected to the four corners of the calcination chamber sealing shell realizes the closing and opening of the calcination chamber sealing shell and the calcination chamber shell under the control of a PLC controller;

[0017] A sensor module is provided on the side of the sealed shell of the calcining chamber, and the sensor module is used to detect the temperature and CO2 concentration inside the shell of the calcining chamber, and transmit the temperature data and CO2 concentration data to the PLC controller;

[0018] The hot blast furnace is provided with an electric heating core which is controlled by a PLC controller to start and stop, heat power and heat duration, and the electric heating core is used to heat the CO2 gas in the hot blast furnace;

[0019] The rear end of the calcining chamber sealed shell is provided with a plurality of groups of negative pressure molds with equal spacing up and down, and the negative pressure molds are used to place the sample bricks, and the top of the calcining chamber inside the calcining chamber shell is provided with a hot air vortex dispersion mechanism, and the negative pressure pump is controlled to start and stop and power by a PLC controller, and the air outlet of the negative pressure pump is connected to the hot air furnace;

[0020] The negative pressure pump works to form negative pressure in the negative pressure mold, so that the CO2 gas heated in the hot blast furnace is transported to the hot blast vortex dispersion mechanism through the air outlet pipe and the telescopic air guide pipe, and then the CO2 gas passes through the sample brick through the hot blast vortex dispersion mechanism and then circulates into the hot blast furnace, thereby realizing the regulation of the temperature inside the calcining chamber;

[0021] The gas tank is filled with CO2 gas, and the gas tank is connected to the hot air furnace through an air inlet pipe. After the air inlet valve on the air inlet pipe is opened, the CO2 concentration inside the calcining chamber is regulated;

[0022] The strengthening liquid tank is connected to a liquid pump, which works under the control of a PLC controller to pump the strengthening liquid in the strengthening liquid tank to a liquid spray mechanism in the calcining chamber. The liquid spray mechanism is located directly above the negative pressure mold and is used to spray strengthening liquid onto the sample bricks on the negative pressure mold.

[0023] Preferably, the chamber closing mechanism comprises a chamber closing spiral shaft screwed to the four corners of the calcining chamber housing and a stepping motor for driving the chamber closing spiral shaft to rotate;

[0024] The stepper motor is fixed to the front end of the sealed shell of the calcining chamber through a motor frame, and the stepper motor is electrically connected to the PLC controller through a wire;

[0025] The output end of the stepper motor is connected with a driving bevel gear, and the front end of the closed-chamber spiral shaft extends through the sealing shell of the calcining chamber and is fixed with a driven bevel gear, and the driving bevel gear is meshed with the side edge of the front end of the corresponding driven bevel gear.

[0026] Preferably, the sensor module includes temperature sensors installed at equal intervals on the upper and lower sides of the sealed shell of the calcining chamber and a gas concentration sensor installed on the upper side of the sealed shell of the calcining chamber;

[0027] The ends of the temperature sensor and the gas concentration sensor are both extended into the sealed shell of the calcining chamber, and the temperature sensor and the gas concentration sensor are connected to the PLC controller signal through a signal line.

[0028] Preferably, the negative pressure mold comprises a plurality of groups of negative pressure seats fixed at the rear end of the sealing shell of the calcining chamber and distributed at equal intervals up and down;

[0029] A negative pressure cavity is provided inside the negative pressure seat, an opening connected to the negative pressure seat is provided at the rear end of the negative pressure seat, a plurality of placement seats connected to the negative pressure cavity are provided at the upper end of the negative pressure seat, and a supporting grid for placing sample bricks is provided at the bottom of the placement seat.

[0030] Preferably, the air inlet of the negative pressure pump is connected to a negative pressure air inlet pipe through a connecting pipe, and the bent pipes connected on both sides of the negative pressure air inlet pipe penetrate the calcining chamber sealing shell and are connected to the front end of the negative pressure seat, so that the bent pipe is connected to the negative pressure chamber;

[0031] The liquid outlet of the liquid pump is connected to a liquid pumping pipe, and the liquid pumping pipe is connected to the liquid spraying mechanism through a liquid delivery pipe fixed at the front end of the sealing shell of the calcining chamber;

[0032] The negative pressure pump is driven by a negative pressure pump motor, and the negative pressure pump motor and the liquid pump are electrically connected to the PLC controller through wires respectively.

[0033] Preferably, an external insulation shell is fixed to the front end of the sealed shell of the calcining chamber, and the external insulation shell covers the outside of the liquid delivery pipe, the negative pressure air inlet pipe and the bent pipe.

[0034] Preferably, the liquid spray mechanism comprises a plurality of groups of transverse tubes fixed at the rear end of the sealing shell of the calcining chamber and a plurality of groups of nozzles connected to the lower ends of the transverse tubes;

[0035] The transverse tube is located directly above the sample brick, and the front end of the transverse tube extends into the sealed shell of the calcining chamber and is communicated with the liquid delivery pipe.

[0036] Preferably, the air outlet pipe is connected to the top of the hot blast furnace, and the end of the air outlet pipe extends through the sealed shell of the calcining chamber and is then connected to the telescopic air guide pipe;

[0037] The hot air vortex dispersion mechanism comprises a plurality of vortex fan motors fixed on the top of the calcining chamber shell, an arc-shaped top plate fixed on the upper part of the calcining chamber, and vortex fans arranged on the bottom wall of the arc-shaped top plate;

[0038] The interior of the arc-shaped top plate is hollow, and the rear end of the telescopic air guide tube is connected to the hollow cavity inside the arc-shaped top plate;

[0039] A bearing cylinder is installed on the top of the calcining chamber. The rotating shaft of the output end of the vortex fan motor passes through the bearing cylinder and is fixedly connected with the corresponding vortex fan. The vortex fan motor is electrically connected to the PLC controller through a wire.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention controls the calcination temperature by dynamically controlling the temperature of CO2 gas, uses a negative pressure mold to guide high-temperature hot air to pass through the interior of the sample brick, and realizes uniform distribution and effective transfer of heat; sprays strengthening liquid at a suitable temperature, uses airflow to guide the strengthening liquid to achieve deep penetration, promotes the degree of material strengthening, and helps to form a more compact and stronger brick structure; the rapid circulation of CO2 gas can eliminate the volume instability factor of the sample brick. The strengthening and calcination process is integrated to improve production efficiency, and the uniform change of the internal and external temperature of the sample brick during the calcination process is ensured, the sample sintering effect is guaranteed, the volume stability of the sample brick is optimized, and a high yield rate is achieved while enhancing the strength and durability of the permeable brick. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the three-dimensional structure of the calcining chamber after the sealed shell of the present invention is opened;

[0042] Figure 2 For the present invention Figure 1 Schematic diagram of the three-dimensional structure from another perspective;

[0043] Figure 3 For the present invention Figure 2 Schematic diagram of the three-dimensional structure from another perspective;

[0044] Figure 4 It is a schematic diagram of the cross-sectional structure of the external heat-insulating shell and the hot blast furnace of the present invention;

[0045] Figure 5 It is a schematic diagram of the three-dimensional structure of the hot air vortex dispersion mechanism and the negative pressure seat of the present invention;

[0046] Figure 6 For the present invention Figure 5 Schematic diagram of the three-dimensional structure from another perspective;

[0047] Figure 7 It is a schematic diagram of the structure of the electrical connection of the temperature sensor, the gas concentration sensor and the PLC controller of the present invention;

[0048] Figure 8 It is a three-dimensional structural schematic diagram of the liquid spray mechanism of the present invention;

[0049] Fig. 9 It is a schematic diagram of the three-dimensional structure of the calcining chamber sealing shell, the calcining chamber outer shell and the closing mechanism connected to each other in the present invention;

[0050] Fig.10 It is a schematic cross-sectional view of the structure of the sample brick of the present invention placed on the negative pressure seat;

[0051] Fig.11 This is a schematic diagram of the structure of the sample brick when calcining the brick according to the present invention;

[0052] Fig.12 It is a schematic diagram of the overall three-dimensional structure of the calcining chamber sealed shell after being closed;

[0053] Fig.13 It is a schematic diagram of the vortex dispersion of gas in the calcining chamber of the present invention.

[0054] In the figure: 1, PLC controller; 2, first mounting seat; 3, second mounting seat; 4, driven bevel gear; 5, driving bevel gear; 6, placement seat; 7, support grid; 8, negative pressure pump motor; 9, negative pressure pump; 10, negative pressure air inlet pipe; 101, elbow; 102, connecting pipe; 11, liquid delivery pipe; 12, hot air furnace; 13, electric heating core; 14, external insulation shell; 15, air outlet pipe; 16, liquid pump; 17, gas tank; 18, air inlet pipe; 19, air inlet valve; 20, first pressure gauge; 21, safety valve; 22 , calcination chamber sealing shell; 23, calcination chamber outer shell; 231, calcination chamber; 24, vortex fan; 25, arc-shaped top plate; 26, closed chamber spiral shaft; 27, stepping motor; 28, temperature sensor; 29, gas concentration sensor; 30, vortex fan motor; 301, bearing cylinder; 302, rotating shaft; 31, telescopic air guide tube; 32, negative pressure seat; 321, negative pressure cavity; 322, opening; 33, horizontal pipe; 34, enhanced liquid tank; 35, second pressure gauge; 36, liquid pumping pipe; 37, nozzle; 38, sample brick. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] Example:

[0057] See also Figure 1-13 , the present invention provides a technical solution:

[0058] A CO2 gas calcination strengthening device for lightweight high-porosity carbide slag clay permeable composite bricks, comprising a negative pressure pump 9, a hot air furnace 12, a gas tank 17, a calcination chamber shell 23, and a calcination chamber sealing shell 22 connected to the front end of the calcination chamber shell 23;

[0059] The closing mechanism connected at the four corners of the calcining chamber sealed shell 22 realizes the closing and opening of the calcining chamber sealed shell 22 and the calcining chamber outer shell 23 under the control of the PLC controller 1;

[0060] The closing mechanism includes a closing screw shaft 26 screwed to the four corners of the calcining chamber housing 23 and a stepping motor 27 for driving the closing screw shaft 26 to rotate;

[0061] The stepper motor 27 is fixed to the front end of the calcining chamber sealed shell 22 through a motor frame, and the stepper motor 27 is electrically connected to the PLC controller 1 through a wire;

[0062] The output end of the stepper motor 27 is connected to a driving bevel gear 5 , and the front end of the closing spiral shaft 26 penetrates through the calcining chamber sealing shell 22 and is fixed with a driven bevel gear 4 , and the driving bevel gear 5 is meshed with the corresponding side of the front end of the driven bevel gear 4 .

[0063] The stepper motor 27 may be a 42HS05-EC1000 stepper motor, a 42HS08-EC1000 stepper motor, a 57HS10-EC1000 stepper motor, or other stepper motors that meet the use requirements.

[0064] A sensor module is provided on the side of the calcining chamber sealed shell 22, and the sensor module is used to detect the temperature and CO2 concentration inside the calcining chamber shell 23, and transmit the temperature data and CO2 concentration data to the PLC controller 1;

[0065] The sensing module includes temperature sensors 28 installed at equal intervals on the upper and lower sides of the calcining chamber sealed shell 22 and a gas concentration sensor 29 installed on the upper side of the calcining chamber sealed shell 22;

[0066] The ends of the temperature sensor 28 and the gas concentration sensor 29 are both extended into the calcining chamber sealed shell 22, and the temperature sensor 28 and the gas concentration sensor 29 are connected to the PLC controller 1 through a signal line.

[0067] The temperature sensor 28 is a PT100 / RTD sensor or a digital temperature sensor of model DS18B20.

[0068] The gas concentration sensor 29 is a CO2 sensor of model MH-Z19, a CO2 sensor of model CCS811, or a CO2 sensor of model Senseair S8.

[0069] The hot blast furnace 12 is provided with an electric heating core 13 whose start and stop, heating power and heating time are controlled by the PLC controller 1. The electric heating core 13 is used to heat the CO2 gas in the hot blast furnace 12; the electric heating core 13 is an electric heating wire.

[0070] A plurality of groups of negative pressure molds which are evenly spaced up and down are provided at the rear end of the calcining chamber sealing shell 22, and the negative pressure molds are used to place sample bricks 38; the negative pressure molds include a plurality of groups of negative pressure seats 32 which are evenly spaced up and down and fixed at the rear end of the calcining chamber sealing shell 22; a negative pressure cavity 321 is provided inside the negative pressure seat 32, an opening 322 which is connected to the negative pressure seat 32 is provided at the rear end of the negative pressure seat 32, a plurality of groups of placement seats 6 which are connected to the negative pressure cavity 321 are provided at the upper end of the negative pressure seat 32, and a supporting grid 7 for placing sample bricks 38 is provided at the bottom of the placement seat 6.

[0071] A hot air vortex dispersion mechanism is provided at the top of the calcining chamber 231 inside the calcining chamber shell 23. The start and stop and power of the negative pressure pump 9 are controlled by the PLC controller 1. The air outlet of the negative pressure pump 9 is connected to the hot air furnace 12. The hot air furnace 12 is also provided with a first pressure gauge 20 and a safety valve 21. The air inlet of the negative pressure pump 9 is connected to the negative pressure air inlet pipe 10 through a connecting pipe 102. The bent pipes 101 connected on both sides of the negative pressure air inlet pipe 10 penetrate the calcining chamber sealing shell 22 and are connected to the front end of the negative pressure seat 32, so that the bent pipe 101 is connected to the negative pressure cavity 321. The negative pressure pump 9 is a negative pressure pump of model KNF Neuberger N86, a negative pressure pump of model Pfeiffer Vacuum MVP 015, a negative pressure pump of model Gast DOA-P703-BC or a negative pressure pump of other models.

[0072] The liquid outlet of the liquid pump 16 is connected to a liquid pumping pipe 36, and the liquid pumping pipe 36 is connected to the liquid spray mechanism through a liquid delivery pipe 11 fixed at the front end of the calcining chamber sealing shell 22;

[0073] The negative pressure pump 9 is driven by the negative pressure pump motor 8 , and the negative pressure pump motor 8 and the liquid pump 16 are electrically connected to the PLC controller 1 through wires. The negative pressure pump 9 and the negative pressure pump motor 8 are both installed on the first mounting seat 2 .

[0074] The negative pressure pump motor model 8 is a negative pressure pump motor of the TECO servo motor JSMA-PUC-PLC series or other negative pressure pump motors that meet the use requirements.

[0075] The negative pressure pump 9 works to form a negative pressure in the negative pressure mold, so that the CO2 gas heated in the hot blast furnace 12 is transported to the hot blast vortex dispersion mechanism through the air outlet pipe 15 and the telescopic air guide tube 31, and then the CO2 gas passes through the sample brick 38 through the hot blast vortex dispersion mechanism and circulates into the hot blast furnace 12 to achieve the regulation of the internal temperature of the calcining chamber 231; the hot blast vortex dispersion mechanism includes a plurality of vortex fan motors 30 fixed on the top of the calcining chamber shell 23, an arc-shaped top plate 25 fixed on the upper part of the calcining chamber 231, and a vortex fan 24 arranged on the bottom wall of the arc-shaped top plate 25; the interior of the arc-shaped top plate 25 is hollow, and the rear end of the telescopic air guide tube 31 is connected to the hollow cavity inside the arc-shaped top plate 25; a bearing cylinder 301 is installed on the top of the calcining chamber 231, and the rotating shaft 302 at the output end of the vortex fan motor 30 passes through the bearing cylinder 301 and is fixedly connected to the corresponding vortex fan 24, and the vortex fan motor 30 is electrically connected to the PLC controller 1 through a wire.

[0076] The vortex fan motor 30 is a TECO servo motor, a CCMHCN DC motor, a Siemens V90 servo drive motor or other vortex fan motors that meet the use requirements.

[0077] The gas tank 17 is filled with CO2 gas, and the gas tank 17 is connected to the hot air furnace 12 through the air inlet pipe 18. After the air inlet valve 19 on the air inlet pipe 18 is opened, the CO2 concentration inside the calcining chamber 231 is regulated; the strengthening liquid tank 34 is installed on the second mounting seat 3, and the strengthening liquid tank 34 is connected to the liquid pump 16. The liquid pump 16 works under the control of the PLC controller 1 to pump the strengthening liquid in the strengthening liquid tank 34 to the liquid spray mechanism in the calcining chamber 231. The liquid spray mechanism is located directly above the negative pressure mold and is used to spray the strengthening liquid onto the sample bricks 38 on the negative pressure mold.

[0078] The liquid pump 16 is a BT101L intelligent peristaltic pump, a Baoding Leifu liquid pump WT600S or other liquid pumps that meet the use requirements.

[0079] An external insulation shell 14 is also fixed to the front end of the calcining chamber sealed shell 22 . The external insulation shell 14 covers the outside of the liquid delivery pipe 11 , the negative pressure air inlet pipe 10 and the elbow 101 , and a second pressure gauge 35 is also provided on the top of the external insulation shell 14 .

[0080] The strengthening liquid is water glass strengthening liquid (but not limited to water glass strengthening liquid, it can also be other strengthening agents that can react with the sample brick 38 to improve the strength of the sample brick 38). The liquid spray mechanism includes a plurality of groups of transverse pipes 33 fixed at the rear end of the calcining chamber sealed shell 22 and a plurality of groups of nozzles 37 connected to the lower end of the transverse pipes 33; the transverse pipes 33 are located directly above the sample bricks 38, and the front end of the transverse pipes 33 extends into the interior of the calcining chamber sealed shell 22 and is connected to the liquid delivery pipe 11. The air outlet pipe 15 is connected to the top of the hot air furnace 12, and the end of the air outlet pipe 15 penetrates and extends into the calcining chamber sealed shell 22 and is connected to the telescopic air guide pipe 31.

[0081] Specifically, when in use, the test equipment (i.e., lightweight high-porosity carbide slag clay permeable composite brick CO2 gas calcination intensification device) is mainly composed of four parts, including a negative pressure calcination module, a sensor module, a liquid spraying module, and a closed chamber module.

[0082] The closing module is mainly driven by a stepping motor 27 to drive the active bevel gear 5, so that the active bevel gear 5 drives the closing spiral shaft 26 to rotate through the driven bevel gear 4, so that the calcining chamber sealing shell 22 moves back and forth, thereby realizing the opening and closing of the front end of the calcining chamber shell 23;

[0083] The negative pressure calcination module is used for calcining clay permeable bricks (ie, sample bricks 38).

[0084] The electric heating core 13 is connected to the PLC controller 1 via an electric heating control line. The PLC controller 1 controls the start and stop, heating power and heating time of the electric heating core 13. The electric heating core 13 is mainly used to heat the gas (i.e., CO2 gas) in the hot blast furnace 12, and the maximum temperature can reach 950°C.

[0085] The high-temperature CO2 gas heated by the electric heating core 13 in the hot blast furnace 12 is transported to the hollow cavity inside the arc-shaped top plate 25 along the air outlet pipe 15 and the telescopic air guide pipe 31. At this time, the PLC controller 1 controls the vortex fan motor 30 to drive the vortex fan 24 to rotate, and transports the high-temperature CO2 gas in the hollow cavity of the arc-shaped top plate 25 to the calcining chamber 231. The operation of multiple groups of vortex fans 24 can ensure that the temperature in the calcining chamber 231 is consistent.

[0086] The negative pressure pump 9 is connected to the PLC controller 1 via a negative pressure pump control line, and the PLC controller 1 can control the start and stop and power of the negative pressure pump 9. The air outlet of the negative pressure pump 9 is connected to the hot air furnace 12 to achieve heat energy saving and air circulation.

[0087] The air inlet of the negative pressure pump 9 is connected to the negative pressure mold (i.e., the negative pressure seat 32). When the sample bricks 38 are loaded on the negative pressure seat 32, the negative pressure pump 9 is started. Since the gas will have resistance when passing through the porous sample bricks 38, a pressure difference will be generated between the calcination chamber 231 (high air pressure) and the negative pressure cavity 321 (low air pressure). By adjusting the power of the negative pressure pump 9, the stable circulation of air inside the sample brick 38 can be maintained.

[0088] The porous sample brick 38 to be calcined is placed on the negative pressure seat 32 , and the negative pressure seat 32 can be replaced according to the size of the sample brick 38 .

[0089] The gas tank 17 is filled with CO2 gas and connected to the gas inlet valve 19 through the gas inlet pipe 18 to achieve the CO2 concentration control inside the calcining chamber.

[0090] The sensor module is mainly composed of a temperature sensor 28 and a gas concentration sensor 29 embedded in the calcining chamber sealing shell 22, and is directly connected to the PLC controller 1 through a sensor signal line. The PLC controller 1 receives and processes the sensor signals.

[0091] The liquid spraying module is mainly composed of a strengthening liquid tank 34 connected to a liquid pump 16. The liquid pump 16 is connected to the PLC controller 1 via a liquid pump control line, and the liquid pump 16 is started and stopped by the PLC controller 1. When the liquid pump 16 works, the strengthening liquid is pumped to the nozzle 37 through the liquid pumping pipe 36, the liquid delivery pipe 11 and the horizontal pipe 33 in sequence, and finally sprayed out through the nozzle 37.

[0092] Test equipment use process:

[0093] 1. Check the equipment's power wires and pipeline connections, and adjust the equipment.

[0094] 2. Use the PLC controller 1 to control the calcination chamber sealing shell 22 to open, put in the porous brick embryo, and close the calcination chamber sealing shell 22.

[0095] 3. Add strengthening liquid into the strengthening liquid tank 34, set the working stage in the PLC controller 1, and define the calcination temperature, duration, and amount of strengthening liquid sprayed in each stage.

[0096] 4. After the CO2 gas is charged into the hot blast furnace 12, the air inlet valve 19 of the gas tank 17 is closed.

[0097] 5. Use the PLC controller 1 to control the electric heating core 13, the negative pressure pump 9, and the vortex fan motor 30 to start working.

[0098] 6. Observe the normal operation of each device and ensure that the pipelines are not blocked, and wait for the sample calcination to be completed.

[0099] 7. After calcination, wait for the temperature to drop, open the calcination chamber, take out the sample, and clean the equipment.

[0100] (1) Uniform temperature calcination:

[0101] The temperature sensor 28 detects the temperature in the calcining chamber 231, and the gas concentration sensor 29 detects the CO2 gas concentration in the calcining chamber 231 to control the temperature rise rate; by adjusting the output power of the negative pressure pump 9, the negative pressure chamber 321 inside the negative pressure seat 32 is in a negative pressure state, and the high-temperature gas is guided to flow through the inside of the sample brick 38, so that the overall temperature difference between the inside and outside of the sample brick 38 is reduced, and the heat exchange rate is improved (reference Fig.11 ), Fig.11 The black arrow in the middle represents the direction of gas flow. The vortex fan 24 is used to achieve uniform temperature in the calcining chamber 231 (refer to Fig.13 ), Fig.13 The black arrow in the middle represents the direction of gas vortex dispersion.

[0102] (2) Pressure control to optimize gas flow strategy:

[0103] A variable pressure gas circulation strategy is adopted. When the negative pressure pump 9 is running, the negative pressure cavity 321 inside the negative pressure seat 32 is in a negative pressure state, and the calcination chamber 231 is in normal pressure. The high-temperature CO2 gas is guided to flow through the inside of the sample brick 38 under the pressure difference between the inside and the outside, thereby increasing the heat exchange efficiency; the hot air furnace 12 is in a high-pressure state, which greatly increases the amount of heated air per unit time and improves the heat exchange efficiency; the calcination chamber 231 maintains normal pressure to prevent the high-temperature CO2 gas from escaping to the outside and reduce heat loss.

[0104] (3) CO2 gas calcination improves the volume stability of bricks:

[0105] The sample brick 38 was calcined at high temperature using CO2 gas treatment to prevent oxidation of the active ingredients and reduce the hazards of residual active ingredients after molding. In order to solve the lime bursting phenomenon of the brick body caused by residual calcium oxide, CO2 gas was used to react with free calcium oxide at 650°C to generate calcium carbonate crystals (calcite decomposition temperature is 950°C), and stabilized (gas circulation) during the calcination process to ensure volume stability during service.

[0106] (4) Negative pressure guides the deep three-dimensional penetration of the enhanced liquid:

[0107] The PLC controller 1 is connected to a temperature sensor 28, which sprays a specific functional strengthening liquid onto the sample brick 38 at a specific temperature. The airflow inside the sample brick 38 under negative pressure will carry the mist strengthening liquid deep into the sample, thereby increasing the contact and reaction degree between the sample brick 38 and the mist strengthening liquid, thereby achieving directional improvement in the functionality of the sample brick 38.

[0108] (5) Construction of multifunctional composite reinforcement layer:

[0109] The strengthening liquid used in the present invention is not limited to the single liquid pumping device limited by the strengthening liquid and the liquid pump 16 in the attached figure. According to specific needs, a variety of strengthening liquids (according to their reaction temperatures) can be pumped and sprayed, and a single (multiple) layer (or functional) strengthening layer (composite layer) can be formed on the surface of the pore structure of the permeable brick or the permeable path, thereby realizing functional permeable bricks in multiple service environments.

[0110] (6) Programmable control of CO2 gas calcination and strengthening mechanism:

[0111] According to the specific needs of the sample, the PLC controller 1 can control the entire calcination and strengthening stabilization process to achieve echelon tasks, and each item can define multiple variable parameters such as temperature, time, strengthening liquid type and spraying amount. By defining the number of tasks, the porous structure of the sample can be gradually optimized, the wear resistance and weather resistance of the sample can be enhanced, and the directional modification or directional function enhancement of the porous material surface can be achieved according to different strengthening liquids. And the data can be analyzed to optimize the calcination and strengthening stabilization procedures to improve the quality and performance stability of the sample.

[0112] (7) Split four-axis precise closing system:

[0113] The present invention adopts a stepper motor 27 to drive the calcining chamber sealing shell 22 as a box closing method, and adopts a stepper motor 27 to drive the closing chamber spiral shaft 26 to perform the chamber opening and closing operations. The four-axis (i.e., four groups of closing chamber spiral shafts 26) positioning and spiral shaft stepping method ensure the accuracy of the calcining chamber outer shell 23 and the calcining chamber sealing shell 22, and improve the convenience of mold replacement, sample loading and unloading, and internal cleaning.

[0114] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CO2 gas calcination strengthening device for lightweight high-porosity carbide slag clay permeable composite bricks, comprising a negative pressure pump, a hot air furnace, a gas tank, a calcination chamber shell, and a calcination chamber sealing shell connected to the front end of the calcination chamber shell, characterized in that: The closing mechanism connected at the four corners of the calcining chamber sealed shell realizes the closing and opening of the calcining chamber sealed shell and the calcining chamber outer shell under the control of the PLC controller; A sensor module is provided on the side of the sealed shell of the calcining chamber, and the sensor module is used to detect the temperature and CO2 concentration inside the shell of the calcining chamber, and transmit the temperature data and CO2 concentration data to the PLC controller; The hot blast furnace is provided with an electric heating core which is controlled by a PLC controller to start and stop, heat power and heat duration, and the electric heating core is used to heat the CO2 gas in the hot blast furnace; The rear end of the calcining chamber sealed shell is provided with a plurality of groups of negative pressure molds with equal spacing up and down, and the negative pressure molds are used to place the sample bricks, and the top of the calcining chamber inside the calcining chamber shell is provided with a hot air vortex dispersion mechanism, and the negative pressure pump is controlled to start and stop and power by a PLC controller, and the air outlet of the negative pressure pump is connected to the hot air furnace; The negative pressure pump works to form negative pressure in the negative pressure mold, so that the CO2 gas heated in the hot blast furnace is transported to the hot blast vortex dispersion mechanism through the air outlet pipe and the telescopic air guide pipe, and then the CO2 gas passes through the sample brick through the hot blast vortex dispersion mechanism and then circulates into the hot blast furnace, thereby realizing the regulation of the temperature inside the calcining chamber; The gas tank is filled with CO2 gas, and the gas tank is connected to the hot air furnace through an air inlet pipe. After the air inlet valve on the air inlet pipe is opened, the CO2 concentration inside the calcining chamber is regulated; The strengthening liquid tank is connected to a liquid pump, which works under the control of a PLC controller to pump the strengthening liquid in the strengthening liquid tank to a liquid spray mechanism in the calcining chamber. The liquid spray mechanism is located directly above the negative pressure mold and is used to spray strengthening liquid onto the sample bricks on the negative pressure mold. The negative pressure mold comprises a plurality of groups of negative pressure seats which are evenly spaced and fixed at the rear end of the sealing shell of the calcining chamber; A negative pressure cavity is provided inside the negative pressure seat, an opening communicating with the negative pressure seat is provided at the rear end of the negative pressure seat, a plurality of placement seats communicating with the negative pressure cavity are provided at the upper end of the negative pressure seat, and a support grid for placing sample bricks is provided at the bottom of the placement seat; The air inlet of the negative pressure pump is connected to the negative pressure air inlet pipe through a connecting pipe, and the bent pipes connected on both sides of the negative pressure air inlet pipe penetrate the calcining chamber sealing shell and are connected to the front end of the negative pressure seat, so that the bent pipes are connected to the negative pressure chamber; The liquid outlet of the liquid pump is connected to a liquid pumping pipe, and the liquid pumping pipe is connected to the liquid spraying mechanism through a liquid delivery pipe fixed at the front end of the sealing shell of the calcining chamber; The negative pressure pump is driven by a negative pressure pump motor, and the negative pressure pump motor and the liquid pump are electrically connected to the PLC controller through wires respectively.

2. The CO2 gas calcination strengthening device for lightweight high-porosity carbide slag clay permeable composite brick according to claim 1 is characterized by: The chamber closing mechanism comprises a chamber closing spiral shaft rod screwed to the four corners of the calcining chamber housing and a stepping motor for driving the chamber closing spiral shaft rod to rotate; The stepper motor is fixed to the front end of the sealed shell of the calcining chamber through a motor frame, and the stepper motor is electrically connected to the PLC controller through a wire; The output end of the stepper motor is connected with a driving bevel gear, and the front end of the closed-chamber spiral shaft extends through the sealing shell of the calcining chamber and is fixed with a driven bevel gear, and the driving bevel gear is meshed with the side edge of the front end of the corresponding driven bevel gear.

3. The CO2 gas calcination strengthening device for lightweight high-porosity carbide slag clay permeable composite brick according to claim 1 is characterized by: The sensor module includes temperature sensors installed at equal intervals on the upper and lower sides of the sealed shell of the calcining chamber and a gas concentration sensor installed on the upper side of the sealed shell of the calcining chamber; The ends of the temperature sensor and the gas concentration sensor are both extended into the sealed shell of the calcining chamber, and the temperature sensor and the gas concentration sensor are connected to the PLC controller signal through a signal line.

4. The CO2 gas calcination strengthening device for lightweight high-porosity carbide slag clay permeable composite brick according to claim 1 is characterized in that: An external heat-insulating shell is also fixed at the front end of the sealed shell of the calcining chamber, and the external heat-insulating shell covers the outside of the liquid conveying pipe, the negative pressure air inlet pipe and the bent pipe.

5. The CO2 gas calcination strengthening device for lightweight high-porosity carbide slag clay permeable composite brick according to claim 1 is characterized by: The liquid spray mechanism comprises a plurality of groups of transverse tubes fixed at the rear end of the sealing shell of the calcining chamber and a plurality of groups of nozzles connected to the lower ends of the transverse tubes; The transverse tube is located directly above the sample brick, and the front end of the transverse tube extends into the sealed shell of the calcining chamber and is communicated with the liquid delivery pipe.

6. The CO2 gas calcination strengthening device for lightweight high-porosity carbide slag clay permeable composite brick according to claim 1 is characterized by: The air outlet pipe is connected to the top of the hot blast furnace, and the end of the air outlet pipe extends through the sealing shell of the calcining chamber and is connected to the telescopic air guide pipe; The hot air vortex dispersion mechanism comprises a plurality of vortex fan motors fixed on the top of the calcining chamber shell, an arc-shaped top plate fixed on the upper part of the calcining chamber, and vortex fans arranged on the bottom wall of the arc-shaped top plate; The interior of the arc-shaped top plate is hollow, and the rear end of the telescopic air guide tube is connected to the hollow cavity inside the arc-shaped top plate; A bearing cylinder is installed on the top of the calcining chamber. The rotating shaft of the output end of the vortex fan motor passes through the bearing cylinder and is fixedly connected with the corresponding vortex fan. The vortex fan motor is electrically connected to the PLC controller through a wire.

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