Cement finished product cooling device

Abstract

The invention discloses a finished cement product cooling device, and relates to the technical field of cement cooling, the finished cement product cooling device comprises a shell and a multi-layer cooling module, the top of the shell is provided with a feed port, and the bottom of the shell is provided with a discharge port; the multiple layers of cooling modules are arranged in the shell at intervals in the vertical direction and used for bearing and conveying cement materials step by step. Each layer of cooling module comprises a grid plate, an air cavity and a heat pipe assembly; the air cavity is formed below the grid plate; the heat pipe assembly is based on the phase change heat transfer principle and comprises an evaporation section and a condensation section. Wherein each layer of grid plate is obliquely arranged, and the higher end of each layer of grid plate is alternately connected to the left side wall or the right side wall of the shell and obliquely extends downwards towards the opposite side wall, so that two adjacent layers of grid plates are arranged in a crossed manner, and materials are guided to form a zigzag gliding path; an airflow supply system is further arranged, and the airflow supply system is communicated with all the air cavities and used for supplying airflow to the air cavities. The efficient cement cooling device can achieve efficient cement cooling in a limited space.

Description

Technical Field

[0001] This invention relates to the field of cement cooling technology, and in particular to a cement product cooling device. Background Technology

[0002] Cement grinding is a crucial step in cement production. During this process, a large amount of mechanical energy is converted into heat, often resulting in excessively high cement discharge temperatures, especially in open-circuit mill systems where temperatures can reach 130-140℃. This high-temperature environment can trigger a series of quality problems, including gypsum phase transformation instability and cement activity degradation. Specifically: Gypsum dehydration: Commonly used desulfurized gypsum (dihydrate gypsum) dehydrates to form hemihydrate gypsum at temperatures exceeding 100℃, altering its solubility characteristics and potentially causing false setting in cement, affecting the structural performance of concrete. Storage thermal inertia: Incompletely converted gypsum continues to dehydrate during storage. The released free water reacts with the active minerals in the cement in a pre-hydration reaction, consuming effective cementitious components, reducing cement strength, and affecting product quality stability.

[0003] Currently, the most common cooling equipment in the industry includes mechanical fluidized bed cooling systems and split-type cooling systems. However, both suffer from the problem of balancing cooling efficiency with equipment compactness, making it impossible to achieve efficient cement cooling within a limited space. Summary of the Invention

[0004] The purpose of this invention is to provide a cement product cooling device to solve the problems existing in the prior art and achieve efficient cement cooling in a limited space.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a cement product cooling device, comprising: a shell and a multi-layer cooling module; the shell has an inlet at the top and an outlet at the bottom; the multi-layer cooling modules are arranged vertically at intervals within the shell for progressively carrying and conveying cement material; each cooling module includes: a grate, an air chamber, and a heat pipe assembly; the grate carries the cement material; the air chamber is located below the grate; the heat pipe assembly is based on the phase change heat transfer principle and has an evaporation section and a condensation section; the evaporation section is located above the grate for absorbing... The heat of the cement material; the condensation section is located outside the shell; wherein, each layer of the grate is inclined, and the higher end of each layer of the grate is alternately connected to the left or right side wall of the shell, and extends downwards inclined towards the opposite side wall, so that the grate of adjacent layers is arranged in a cross pattern, thereby guiding the material to form a tortuous downward path; an airflow supply system is also provided, which is connected to each of the air chambers and is used to supply airflow to the air chambers, the airflow passing through the grate and acting on the cement material thereon.

[0006] Preferably, the evaporation section is a three-dimensional mesh heat pipe; the condensation section includes a multi-layer fin heat dissipation module connected to the three-dimensional mesh heat pipe and a variable frequency exhaust fan for forced ventilation of the fin heat dissipation module.

[0007] Preferably, it also includes a temperature monitoring system, which includes high-precision thermocouples disposed between adjacent cooling modules for monitoring temperature gradient changes in cement materials.

[0008] Preferably, it also includes a central control system, which receives monitoring data from the thermocouple and dynamically adjusts the airflow of the air supply system and the operating intensity of the heat pipe assembly.

[0009] Preferably, each grate is provided with an upwardly extending baffle plate at its end.

[0010] Preferably, each air chamber is also equipped with a pressure sensing device, which is used to sense the air pressure and then reflect the corresponding material thickness on the grate.

[0011] Preferably, the airflow supply system includes a blower and a guide pipe placed outside the housing, the guide pipe being arranged inside the air cavity, and the blower delivering pressurized airflow to the air cavity through the guide pipe.

[0012] Preferably, each layer of the grate is composed of an array of multiple sub-grates, and adjacent grates are connected by a labyrinth-type sealing structure.

[0013] Preferably, a dust collector is integrated at the top of the housing; a star-shaped discharge valve is provided at the discharge port at the bottom of the housing.

[0014] Preferably, the tilt angle of the grate is 10~20°.

[0015] The present invention achieves the following technical effects compared to the prior art: This device constructs a composite high-efficiency cooling system. The heat pipe evaporation section directly contacts the high-temperature cement material to absorb heat energy, resulting in high cooling efficiency. Furthermore, it achieves staged heat dissipation by optimizing the heat conduction path, making the entire device compact in structure and providing good and stable cooling effects. Therefore, this invention can achieve efficient cement cooling within a limited space.

[0016] In addition, by setting up an airflow supply system, high-speed airflow in the air chamber acts on the surface through the gaps in the grate. On the one hand, this causes turbulence in the accumulated material, improving particle dispersion and significantly increasing the contact area with the evaporation section above the grate, thereby further improving the cooling effect. On the other hand, a micron-level dynamic air film is formed at the interface between the material and the grate. This film achieves self-cleaning and fluidized material transport through air cushion suspension, and also mitigates the risk of material caking by using turbulent disturbance. Ultimately, it forms a continuous and stable sliding motion trajectory, thereby improving the stability of cooling. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the cement product cooling device provided in an embodiment of the present invention; Figure 2 A schematic diagram showing the structure in which two adjacent sub-grate plates are connected by a labyrinth-type sealing structure; In the diagram: 1-shell; 2-cooling module; 21-grate; 22-guide pipe; 23-pressure sensing device; 24-baffle plate; 3-heat pipe assembly; 31-evaporation section; 32-condensation section; 33-variable frequency exhaust fan; 4-thermocouple; 5-dust collector; 6-star valve. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a cement product cooling device to solve the problems existing in the prior art and achieve efficient cement cooling in a limited space.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The following is combined Figures 1 to 2 The following describes embodiments of the present invention.

[0023] Example 1 This invention provides a cement product cooling device, comprising: a shell 1 and a multi-layer cooling module 2. The shell 1 has a feed inlet at the top and a discharge outlet at the bottom. The multi-layer cooling modules 2 are arranged vertically at intervals within the shell 1 for progressively carrying and conveying cement materials. Each cooling module 2 includes: a grate 21, an air chamber, and a heat pipe assembly 3. The grate 21 carries the cement materials. The air chamber is located below the grate 21. The heat pipe assembly 3, based on the phase change heat transfer principle, has an evaporation section 31 and a condensation section 32. The evaporation section 31 is located above the grate 21. Used to absorb the heat of cement materials; condensation section 32 is set outside shell 1; wherein, each layer of grate 21 is inclined, and the higher end of each layer of grate 21 is alternately connected to the left or right side wall of shell 1, and extends downward inclined towards the opposite side wall, so that the grate 21 of adjacent layers are arranged in a cross pattern, thereby guiding the material to form a tortuous downward path; the present invention is also provided with an airflow supply system to assist the material to slide down, the airflow supply system is connected to each air chamber, and is used to supply airflow to the air chamber, the airflow passes through the grate 21 and acts on the cement material thereon.

[0024] This device constructs a composite high-efficiency cooling system. The heat pipe evaporation section 31 directly contacts the high-temperature cement material to absorb heat energy, resulting in high cooling efficiency. Furthermore, it achieves staged heat dissipation by optimizing the heat conduction path, making the entire device compact in structure and providing good and stable cooling effects. Therefore, this invention can achieve efficient cement cooling within a limited space.

[0025] In addition, by setting up an airflow supply system, the high-speed airflow in the air chamber acts on the surface through the gaps of the grate 21. On the one hand, it generates a turbulent effect in the accumulated material, improves the particle dispersion, and significantly increases the contact area with the evaporation section 31 above the grate 21, thereby further improving the cooling effect. On the other hand, a micron-level dynamic air film is formed at the interface between the material and the grate 21. It achieves self-cleaning and fluidized material conveying through the air cushion suspension effect, and also solves the risk of material caking by means of turbulent disturbance, ultimately forming a continuous and stable sliding motion trajectory, thereby improving the stability of cooling.

[0026] In some embodiments, the evaporation section 31 is a three-dimensional mesh heat pipe; the condensation section 32 includes a multi-layer fin heat dissipation module connected to the three-dimensional mesh heat pipe and a variable frequency exhaust fan 33 for forced ventilation of the fin heat dissipation module.

[0027] This embodiment utilizes a three-dimensional mesh heat pipe to form a dense, three-dimensional heat-absorbing network above the grate 21, increasing the contact area and opportunities between the heat pipe and the high-temperature material, thus achieving efficient heat capture. On the heat dissipation side, the condensation section 32 is tightly connected to the multi-layer fin module, rapidly transferring the condensation heat inside the pipe to the large extended surface. The integrated variable frequency exhaust fan 33 provides active and controllable cooling capability. Its operating logic is as follows: when the cement temperature is high and the heat load is large, the system can increase the fan speed to enhance forced convection and quickly remove heat from the fins; when the heat load decreases, the speed is reduced to save energy. This combination of "three-dimensional mesh heat absorption + extended surface heat dissipation + variable frequency intelligent blowing" deeply integrates the high efficiency of passive phase change heat transfer with the flexibility of active air cooling, optimizing the heat exchange capacity and environmental adaptability of the entire heat pipe system.

[0028] The arrangement of the heat pipes in the evaporation section 31 is not limited to a mesh pattern; a parallel array of finned tube bundles can also be used, with the aim of increasing the heat exchange area. The fans in the heat dissipation unit are not limited to variable frequency speed control; multiple fixed-speed fans can also be used to adjust the airflow through start-stop combinations. The material and shape of the fins (such as flat fins or corrugated fins) can be selected and optimized according to the heat dissipation requirements.

[0029] In some examples, a three-dimensional mesh heat pipe is disposed between two layers of grate 21. The material flowing down from the upper grate 21 passes through the three-dimensional mesh heat pipe and falls onto the lower grate 21, which further enhances the heat exchange effect.

[0030] In some embodiments, the cement product cooling device further includes a temperature monitoring system, which includes a high-precision thermocouple 4 disposed between adjacent cooling modules 2 for monitoring temperature gradient changes in cement materials.

[0031] In this embodiment, the high-precision thermocouple 4 can continuously and in real-time monitor the temperature of the cement after each cooling stage. The detected temperature information can serve two purposes: first, as an effectiveness evaluation indicator to directly determine whether the final discharge temperature meets the preset standard (e.g., 65±5℃); second, as a process diagnostic tool, by analyzing the temperature difference changes between adjacent layers, it can determine whether the actual working efficiency of each cooling module 2 is normal. For example, if the temperature difference before and after a certain layer is unusually small, it may indicate poor heat exchange of the heat pipes in that layer or uneven airflow distribution. This provides a data basis for subsequent maintenance work.

[0032] The arrangement of the thermocouple 4 in this invention can also be finely adjusted, for example, partially embedded in the surface of the grate 21, as long as it can effectively sense the temperature of the material.

[0033] In some embodiments, the cement product cooling device also includes a central control system, which receives monitoring data from thermocouple 4 and dynamically adjusts the airflow of the air supply system and the operating intensity of the heat pipe assembly 3.

[0034] This embodiment achieves closed-loop intelligent control of the cooling process, which is key to the device's "adaptive" capability. The central control system continuously compares the real-time data fed back by the temperature sensor with the preset temperature model or target value. When the actual temperature deviates from the expected value (for example, due to a sudden increase in the feed temperature causing the temperature at a certain point to be too high), the control system will immediately initiate an adjustment program: for example, it can instruct to increase the speed of the variable frequency exhaust fan 33 in the heat pipe condensation section 32, accelerating the condensation and reflux of the working fluid inside the heat pipe, thereby increasing the "heat extraction" power of the entire heat pipe network. This precise adjustment based on real-time feedback enables the device to actively suppress various disturbances (such as material quantity fluctuations and ambient temperature changes), ensuring that the outlet temperature remains stable within a very narrow acceptable range, achieving reliable and consistent cooling performance.

[0035] The control algorithm can employ classic PID control, or more advanced algorithms such as fuzzy control and predictive control to handle nonlinear and large-time-delay systems. The controlled object can be further expanded, for example, by linking the opening of the feed valve to control the feed rate, forming a more complete production closed loop.

[0036] In some embodiments, each grate 21 is provided with an upwardly extending baffle 24 at its end.

[0037] In this embodiment, the baffle plate 24 is a simple yet efficient mechanical flow limiting and stabilizing device. Its main function is to construct a material dam at the discharge edge of each grate plate 21. Material sliding to this point will temporarily accumulate until the material layer thickness exceeds the height of the baffle plate 24 before it overflows and falls evenly. This design brings multiple positive effects: First, it forces the formation and maintenance of a dynamically stable minimum material layer, avoiding air leakage caused by the partial exposure of the grate plate 21 due to instantaneous material interruption or excessive airflow. This results in a stable material layer above the grate plate 21, which in turn plays a certain role in balancing the airflow distribution in the lower air chamber, contributing to a more uniform fluidization effect. If the baffle plate 24 is not set up, it is difficult for a stable material layer to accumulate above the grate plate 21, which would cause partial exposure of the grate plate 21. In this case, the pressurized gas in the air chamber will preferentially flow out from the gaps on the exposed surface of the grate plate 21, making it difficult for material in other locations to achieve fluidized conveying, thus affecting the entire working process.

[0038] The height of the baffle plate 24 can be fixed or adjustable (e.g., via a plate or screw) to accommodate different material properties and process requirements. The cross-sectional shape of the baffle plate 24 can also be arc-shaped or other streamlined shapes that facilitate the guidance of material overflow.

[0039] In some embodiments, each air chamber is also provided with a pressure sensing device 23, which is used to sense the air pressure and thus the material thickness on the corresponding grate 21.

[0040] This embodiment introduces an online, non-contact method for monitoring material layer thickness. Its principle is based on the fact that, under fixed air supply conditions, the pressure drop of the airflow through the porous grate 21 and the material layer above it is positively correlated with the material layer thickness. Therefore, the static pressure value within the air chamber becomes a characterization of the material layer thickness. By monitoring pressure changes in real time, various abnormal operating conditions can be warned in advance: a continuous increase in pressure may indicate poor material flow, material layer thickening, and a risk of blockage; an abnormal decrease in pressure may indicate that the material is about to run out or that a localized gap in the grate 21 is leaking, causing airflow to escape through the leaked gap. This provides operators with crucial equipment status information, enabling preventative maintenance and adjustments. For example, if low air pressure is detected in the air chamber, the height of the baffle plate 24 needs to be increased to increase the material thickness accumulated on the grate plate 21, preventing fluidization instability caused by uneven material distribution under wind pressure due to insufficient material thickness. Of course, low air pressure may also be due to a mismatch between the feed flow rate (low) and the air flow rate (high), causing material to be completely blown away in a certain area, leading to rapid depressurization and pressure reduction in the air chamber. The specific cause needs to be analyzed specifically before taking appropriate measures.

[0041] The pressure sensing device 23 can be a piezoresistive, capacitive, or piezoelectric sensor. In addition to local display and alarm functions, the monitored signal can also be fed back to the central control system as an important process variable to enable advanced process control strategies that automatically adjust the blower volume according to real-time material thickness.

[0042] In some embodiments, the airflow supply system includes a blower and a guide pipe 22 located outside the housing 1. The guide pipe 22 is arranged inside the air chamber, and the blower delivers pressurized airflow to the air chamber through the guide pipe 22.

[0043] This embodiment places the blower externally, facilitating equipment selection, installation, heat dissipation, vibration isolation, and maintenance, and avoiding the impact of harsh working environments with high temperatures and high dust on the blower's lifespan and performance. The rationally arranged guide pipes 22 (which may have flow equalization holes or nozzles) within the air chamber ensure that the pressurized airflow can be relatively evenly distributed to various areas at the bottom of the grate 21, providing a foundation for forming a stable fluidization field.

[0044] In some examples, a single high-power centrifugal blower can be used to centrally supply air to all air chambers, or multiple low-power Roots blowers or high-pressure blowers can be used to independently supply air to each zone; the latter offers greater flexibility in adjustment. Manual or electric regulating valves can be installed on the guide pipe 22 for initial commissioning or dynamic balancing of the airflow in each branch.

[0045] In some embodiments, each grate 21 is composed of an array of multiple sub-grates, and adjacent grate 21 are connected by a labyrinth-type sealing structure.

[0046] This embodiment uses modular sub-grate splicing, which greatly reduces the difficulty and cost of manufacturing, heat treatment, transportation and replacement of large grate 21.

[0047] In addition, the surface of the grate plate 21 is polished, and the labyrinth sealing structure between the grate plates 21 ensures the formation of a low-friction transmission interface.

[0048] In some embodiments, a dust collector 5 is integrated on the top of the housing 1; a star-shaped discharge valve 6 is provided at the discharge port at the bottom of the housing 1.

[0049] In this embodiment, a dust collector 5 (such as a pulse bag filter) is integrated at the top of the housing 1. This efficiently captures dust generated during the cooling process due to material falling and airflow carrying, achieving clean production and meeting stringent environmental emission standards. The recovered finished powder also improves economic efficiency. The core function of the bottom star-shaped discharge valve 6 is to achieve airtight continuous discharge. It discharges material quantitatively, cell by cell, through a rotating impeller. Simultaneously, its precise rotor and the gap between it and the housing 1 form an effective mechanical seal, significantly preventing the free exchange of gases inside and outside the device. This prevents large amounts of external cold air from flowing back into the device and disrupting the cooling airflow and temperature field, and also prevents the internal positive pressure airflow from carrying dust out, ensuring the stability and sealing of the system's internal operating conditions.

[0050] In some embodiments, the tilt angle of the grate 21 is 10~20°, preferably 15°. The tilt angle can be finely adjusted within this preferred range (10°~20°), for example, set to 12°, 15° or 18°. In some examples, the tilt angle of the grate 21 can even be designed to be adjustable, dynamically adjusted within a certain range (e.g. 8°~25°) via hinges or hydraulic mechanisms to adapt to the needs of different material characteristics or process stages.

[0051] In some embodiments, the housing 1 is made of a composite wear-resistant plate with an 8mm Q235B steel plate and an 8mm wear-resistant layer (carbon, chromium, silicon, manganese). The composite wear-resistant plate has excellent wear resistance and impact resistance, ensuring that the device is not rapidly worn by materials.

[0052] In some embodiments, the evaporation section 31 is integrated 30 mm above the grate 21.

[0053] In some embodiments, the discharge temperature of this device is stably controlled within the range of 65±5℃, which meets the storage temperature requirements specified by ISO standards.

[0054] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A cement product cooling device, characterized in that, include: The casing has a feed inlet at the top and a discharge outlet at the bottom. Multi-layer cooling modules are arranged vertically at intervals within the housing for progressively carrying and conveying cement materials. Each cooling module includes: A grate is used to support cement materials. An air cavity is constructed below the grate plate; The heat pipe assembly, based on the principle of phase change heat transfer, has an evaporation section and a condensation section; the evaporation section is located above the grate and is used to absorb heat from the cement material; the condensation section is located outside the shell. The grates in each layer are inclined, and the higher end of each grates is alternately connected to the left or right side wall of the shell and extends downwards inclined toward the opposite side wall, so that the grates of adjacent layers are arranged in a cross pattern, thereby guiding the material to form a tortuous downward path. An airflow supply system, connected to each of the air chambers, is used to supply airflow to the air chambers, which passes through the cement material acting on the grate.

2. The cement product cooling device according to claim 1, characterized in that: The evaporation section is a three-dimensional mesh heat pipe; the condensation section includes a multi-layer fin heat dissipation module connected to the three-dimensional mesh heat pipe and a variable frequency exhaust fan for forced ventilation of the fin heat dissipation module.

3. The cement product cooling device according to claim 1, characterized in that: It also includes a temperature monitoring system, which includes high-precision thermocouples located between adjacent cooling modules for monitoring temperature gradient changes in cement materials.

4. The cement product cooling device according to claim 3, characterized in that: It also includes a central control system, which receives monitoring data from the thermocouples and dynamically adjusts the airflow of the air supply system and the operating intensity of the heat pipe assembly.

5. The cement product cooling device according to claim 1, characterized in that: Each grate is equipped with an upward-extending baffle plate at its end.

6. The cement product cooling device according to claim 1, characterized in that: Each air chamber is also equipped with a pressure sensing device, which is used to sense the air pressure and then reflect the corresponding material thickness on the grate plate.

7. The cement product cooling device according to claim 1, characterized in that: The airflow supply system includes a blower and a guide pipe placed outside the housing. The guide pipe is arranged inside the air cavity, and the blower delivers pressurized airflow to the air cavity through the guide pipe.

8. The cement product cooling device according to claim 1, characterized in that: Each layer of the grate is composed of an array of multiple sub-grates, with adjacent grates connected by a labyrinthine sealing structure.

9. The cement product cooling device according to claim 1, characterized in that: A dust collector is integrated at the top of the housing; a star-shaped discharge valve is provided at the discharge port at the bottom of the housing.

10. The cement product cooling device according to claim 1, characterized in that: The grate plate has an inclination angle of 10~20°.

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