A multi-level matrix cement storage

Abstract

The present invention discloses a multi-level matrix cement silo. It includes a cement buffer silo and multi-level, multi-row cement silos. A dust collector is installed on the cement buffer silo. A discharge pipe is provided at the bottom of the cement buffer silo and the cement silo. The discharge pipe is connected to the feed port of the lower cement silo. A Roots blower is installed under the lowest cement silo. The present invention utilizes the pressure difference generated by the cement entering the upper cement silo into the lower cement silo to agitate positive pressure air to the upper buffer silo or the aeration chute at the bottom of the cement silo. By agitating the cement at multiple levels, the purpose of cooling, homogenizing and preventing condensation is achieved, while saving energy. The air agitating the cement is heated by the lower cement, and the temperature difference with the cement is reduced by the second and third levels, which can avoid the generation of condensed water.

Description

Technical Field

[0001] The present invention relates to the field of cement production, and in particular to a multi-level matrix cement silo. Background Art

[0002] Cement produced by cement companies must undergo physical inspections at certain ages before it can be shipped. Therefore, cement plants must have cement silos with sufficient capacity to store at least seven days' worth of cement for sale. Existing large cement silos consist of cylindrical concrete structures, a central pressure-reducing cone, aerated chutes at the bottom, roots blowers at the bottom, dust collectors on the roof, and feeders. Each silo ranges in height from 30 to 50 meters, with capacities ranging from 3,000 to 10,000 tons.

[0003] The existing technology is to unload at the bottom or side of the silo, and use inflation or mechanical methods to unload the cement. The function of the central pressure reducing cone is to reduce the pressure on the central discharge port to prevent the cement from being crushed at the discharge port. The high-pressure gas generated by the Roots blower is evenly distributed through the bottom inflation chute to promote the flow and discharge of cement and prevent agglomeration.

[0004] The applicant has discovered that the prior art has at least the following technical problems:

[0005] 1. Cement storage is high and has a long storage time. After more than 15 days, cement is prone to caking. The longer the storage time, the more serious the caking. When the cement storage is high, the pressure on the aeration chute at the bottom is high, which makes it difficult to agitate the cement flow, causing caking. At the same time, the extremely high pressure in the storage can easily damage the aeration chute. The pressure generated when the storage is high is very high, and the airflow cannot drive the cement flow in the entire storage, which is not conducive to cement homogenization and affects the quality.

[0006] 2. The cement storage temperature is high and easy to agglomerate. When it is higher than 80℃, it will cause condensation of water due to temperature difference and cement hydration. When it is higher than 120℃, the condensation water in the gypsum will precipitate and also cause cement hydration.

[0007] 3. Roots blowers blow cement, consuming high power, which is not conducive to energy conservation and carbon reduction, and increases cement production costs. At the same time, the noise is particularly loud, which is not conducive to the physical and mental health of employees;

[0008] 4. When large areas of cement agglomerate, it will affect the normal discharge and use of cement, and often requires mechanical or manual cleaning, which has the disadvantages of high difficulty in operation, low cleaning efficiency and extremely high safety risks. The cement storage material pressure is high and is designed with a pressure relief cone, which is not conducive to discharge and clearing. Summary of the Invention

[0009] The purpose of the present invention is to provide a multi-level matrix cement silo, which promotes cement flow, reduces cement temperature and reduces the problem of cement agglomeration through a low-energy cement production and storage process.

[0010] To achieve the above objectives, the present invention provides the following technical solutions:

[0011] The present invention provides a multi-level matrix cement silo, which includes a cement buffer silo and multi-level, multi-row cement silos. A dust collector is installed on the cement buffer silo. A discharge pipe is provided at the bottom of the cement buffer silo and the cement silo. The discharge pipe is connected to the feed port of the lower cement silo. A Roots blower is installed under the lowest cement silo.

[0012] Furthermore, each row of the multi-level and multi-row cement silos is composed of two or more cement silos arranged vertically or staggered in a matrix.

[0013] Furthermore, a distribution valve is provided on the discharge pipe, and the distribution valve is controlled pneumatically or electrically to select the discharge direction or close it, so that cement can be selected to enter the cement silo at the next level.

[0014] Furthermore, the bottom of the cement buffer bin and the cement bin are both equipped with an air chute, which is covered with air holes and canvas.

[0015] Furthermore, a positive pressure air duct and an air valve are installed on the upper part of the cement silo. The air valve is controlled pneumatically or electrically. The positive pressure air duct is connected to the upper cement buffer silo or the inflation chute at the lower part of the cement silo.

[0016] Based on the above technical solution, the embodiments of the present invention can produce at least the following technical effects:

[0017] (1) The compressed air for agitating and homogenizing cement is replaced by the positive pressure air generated when the upper and lower cement silos are loaded and unloaded, saving energy. The Roots blower started in the last cement silo can significantly reduce its power consumption due to the low height of the cement silo.

[0018] (2) Through the agitation of multi-stage cement silos, the fluidity and homogenization of cement are greatly improved, and the temperature and quality stability of cement are significantly improved.

[0019] (3) Each level of cement silo has no pressure relief cones, which improves the fluidity of material discharge. The height of each level of cement silo is lower than that of the original cement warehouse, making cleaning safer and easier. Even in the off-season, cement can flow easily, is not easy to cause caking, and will not accumulate in the warehouse. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 is a schematic structural diagram of embodiment 1 of the present invention;

[0022] Figure 3 This is a working principle diagram of Example 1 of the present invention;

[0023] In the figure: 1. Cement buffer silo; 2. Cement silo; 3. Material distribution valve; 4. Air valve; 5. Positive pressure air duct; 6. Dust collector; 7. Roots blower. DETAILED DESCRIPTION

[0024] The present invention provides a multi-level matrix cement silo, comprising a cement buffer silo 1 and a multi-level, multi-row cement silo 2. A dust collector 6 is installed on the cement buffer silo 1. A discharge pipe is provided at the lower part of the cement buffer 1 and the cement silo 2. The discharge pipe is connected to the feed port of the lower cement silo 2. A Roots blower 7 is installed under the lowest cement silo 2.

[0025] Each row of the multi-level and multi-row cement silos 2 is composed of two or more levels of cement silos 2 vertically or staggered in a matrix shape.

[0026] The discharging pipe is provided with a discharging valve 3 , which is pneumatically or electrically controlled to select the discharging direction or close the discharging valve 3 , so that cement can be selected to enter the cement silo 2 at the lower level.

[0027] The bottoms of the cement buffer silo 1 and the cement silo 2 are both equipped with an inflation chute, which is covered with air holes and canvas.

[0028] A positive pressure air duct 5 and an air valve 4 are installed on the upper part of the cement silo 2. The air valve 4 is controlled pneumatically or electrically. The positive pressure air duct 5 is connected to the upper cement buffer silo 1 or the inflation chute at the lower part of the cement silo 2.

[0029] The present invention will be described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 、 2As shown, the cement produced by the cement mill enters the storage bucket through the chute and is transported to the cement buffer silo 1. A dust collector 6 is installed on the cement buffer silo 1 to filter dust and release air pressure during the cement feeding process. When the cement buffer silo 1 is full of cement or the cement storage level reaches more than 60%, the feeding is stopped, the feed valve is closed, and the dust collector 6 is closed. The cement buffer silo 1 becomes a closed silo. According to production needs, the cement in the buffer silo 1 can be selected to be placed downward into the 103, 203, and 303 cement silos. To enter cement silo 203, open the inlet gate valve of cement silo 203, and cement begins to enter silo 203 from buffer silo 1. At this time, the outlet of silo 203 is closed, and it is also a closed silo. As the cement in the silo increases, the air pressure in silo 203 increases, while the air pressure in buffer silo 1 decreases. When the air pressure difference exceeds the cement material pressure of buffer silo 1, the air in silo 203 generates positive pressure wind for buffer silo 1, and the air in the positive pressure air duct 5 is used to flush the aeration chute of buffer silo 1, agitating the cement flow and homogenizing. After all or most of the cement in buffer silo 1 enters silo 203, close the discharge valve, and the cement in silo 203 can be arranged to enter the next-level cement silo 2 according to production needs. Similarly, when entering silo 102, if the air pressure difference between silo 102 and silo 203 exceeds the silo pressure of silo 203, the generated positive pressure wind agitates and homogenizes the cement in silo 203.

[0031] When 101, 201, 301 or the bottom cement silo 2 is discharging cement, it is necessary to start the Roots blower 7 at the bottom of the silo to agitate and homogenize the cement in the silo. Due to the low height of the cement silo, the power consumption of the Roots blower can be greatly reduced.

[0032] Working principle Figure 3 As shown, the air delivered by the Roots blower is at room temperature. Upon entering the bottom cement silo, it agitates and homogenizes the cement, simultaneously raising the air temperature. This causes the air density to decrease and the air pressure to rise, facilitating the generation of positive pressure wind. Through the contact and agitation of the air and cement within the multi-stage cement silo 2, the air temperature rises rapidly while the cement temperature drops. In cement silos 2 above the second stage, the temperature difference between the air and cement is less than 10°C, preventing condensation and cement hydration.

[0033] To further explain, the reason for the increase in air pressure in the lower cement silo 2 is that the volume of air decreases after cement enters. The cement heats the air, causing the air to expand and become less dense, resulting in an increase in air pressure. The reason for the decrease in air pressure in the upper cement silo is that the volume of air increases as cement flows into the lower cement silo.

[0034] To further illustrate, each cement silo 2 can also be fed with cement longitudinally and downwardly. For example, cement silo 103 can be fed with cement silo 202 or 302. Positive pressure air is generated from the lower cement silo to the upper cement silo through the connected positive pressure air duct, which plays the role of cement agitation and homogenization, forming a three-dimensional, matrix cement flow system.

[0035] To further illustrate, two or more buffer bins 1 can be provided. When cement is discharged from buffer bin 1, the cement produced by the cement mill can be switched to another buffer bin without the need to shut down the cement mill.

[0036] To further illustrate, if all cement silos 2 are full, the cement can be poured back into the buffer silo through the discharge chute and the storage bucket, and the cement can be discharged downward step by step to promote the flow and homogenization of the cement.

[0037] It is further explained that since the height of each level of cement silo 2 is lowered, the material pressure is not high and there is no need to add pressure reducing cones to the cement silos at each level, and the material discharge smoothness is significantly improved.

Claims

1. A multi-level matrix cement silo, characterized in that: The invention comprises a cement buffer bin (1) and a multi-stage, multi-row cement bin (2), wherein a dust collector (6) is installed on the cement buffer bin (1), a discharge pipe is provided at the bottom of the cement buffer bin (1) and the cement bin (2), and the discharge pipe is connected to the feed port of the lower cement bin (2). A Roots blower (7) is installed under the lowest cement bin (2), and an inflation chute is installed at the bottom of the cement buffer bin (1) and the cement bin (2), and the inflation chute is covered with air holes and covered with canvas. A positive pressure air duct (5) and an air valve (4) are installed on the top of the cement bin (2), and the air valve (4) is controlled pneumatically or electrically. The positive pressure air duct (5) is connected to the inflation chute at the bottom of the upper cement buffer bin (1) or the cement bin (2).

2. A multi-level matrix cement silo according to claim 1, characterized in that: Each row of the multi-stage, multi-row cement silos (2) is composed of two or more stages of cement silos (2) arranged vertically or staggered in a matrix.

3. A multi-level matrix cement silo according to claim 1, characterized in that: The discharging pipe is provided with a discharging valve (3), and the discharging direction or closing of the discharging valve (3) is selected by pneumatic or electric control, so that cement can be selected to enter the cement silo (2) at the lower level.

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