Ceramsite preparation system

Abstract

The utility model relates to the technical field of building and municipal engineering, in particular to a ceramsite preparation system. Comprising a conveying unit, a storage unit, a drying unit and a granulation unit, the conveying unit comprises a receiving hopper, a constant feeder, a belt conveyor, a stone remover and a roller type fine crusher, and municipal sludge and building spoil are conveyed into the storage unit; the storage unit comprises a sludge bin and a pre-homogenization storage yard, the sludge bin is used for storing municipal sludge, and the pre-homogenization storage yard is used for storing building spoil; the drying unit comprises a drying and pulverizing machine, and the drying and pulverizing machine is connected with the granulation unit; the granulation unit comprises a double-roller granulator, a rotary kiln and a grate cooler, the dried semi-dry ceramsite is conveyed to the rotary kiln, and the sintered ceramsite is cooled to obtain a high-strength ceramsite finished product. The ceramsite has the advantages that the building spoil and the municipal sludge are adopted as raw materials, organic matters in the sludge are combusted, so that the ceramsite has a light porous structure, a large amount of building spoil can be consumed, and the resource utilization rate is increased.

Description

Technical field:

[0001] The utility model relates to the technical field of construction and municipal engineering, in particular to a ceramsite preparation system. Background technology:

[0002] Most of the construction waste is composed of construction waste and urban sludge; among them, construction waste has the characteristics of large quantity, complex composition, and difficult treatment. It is generally transported directly to remote places such as suburbs and disposed of by open-air stacking or landfill, which not only occupies land resources, but also causes environmental pollution. In the prior art, publication number: CN 113416034 A discloses a freeze-thaw resistant engineering slag unburned brick and its preparation method, which includes cement, engineering slag, building recycled stone powder and modified admixtures to prepare unburned bricks, which can be used for enclosures and partitions of some non-load-bearing structures, and used in municipal roads and some low-load municipal projects, but this method does not have a burning process and is not suitable for the harmless disposal of urban sludge.

[0003] Municipal sludge is a kind of waste that is difficult to be disposed harmlessly and recycled. At present, many cities generally use landfill and composting to dispose of it, which not only occupies a large amount of land resources, but also has the possibility of causing secondary pollution to land and environmental safety. At present, to achieve the harmless and resourceful disposal of sludge, it is necessary to use municipal sludge as a raw material or additional raw material for building materials, and the kiln firing process is more suitable for harmless disposal of municipal sludge. Because the combustion temperature of the kiln is generally higher than 1000℃, and the kiln body is tens of meters long, the material is fully burned in the kiln, which not only kills all harmful bacteria and microorganisms in the sludge, but also the heavy metals in the sludge are solidified and sealed in the lattice, which will not cause secondary damage to the environment, nor will it affect the product quality. At the same time, the organic matter in the sludge can participate in the combustion to reduce energy consumption, which is a truly harmless disposal and resource utilization.

[0004] Therefore, those skilled in the art are in urgent need of providing a firing equipment system to realize the resource utilization of construction waste and urban sewage sludge. Utility model content:

[0005] The purpose of the utility model is to provide a ceramsite preparation system, which can effectively solve the technical problems in the background technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model discloses a ceramsite preparation system, comprising a conveying unit, a storage unit, a drying unit and a granulation unit;

[0008] The conveying unit includes a receiving hopper, a plunger pump, a quantitative feeder, a stone remover and a roller fine crusher; the urban sludge is conveyed to the storage unit through the receiving hopper and the plunger pump; the construction waste soil is received and quantitatively conveyed through the receiving hopper and the quantitative feeder, and is conveyed to the storage unit through the stone remover and the roller fine crusher;

[0009] The storage unit comprises a sludge bin and a pre-homogenization yard, wherein the sludge bin stores urban sludge through a plunger pump, the pre-homogenization yard stores construction waste through a belt conveyor, and the pre-homogenization yard is connected to a drying unit through a belt conveyor;

[0010] The drying unit comprises a drying and grinding machine, the inlet of the drying and grinding machine is connected to the pre-homogenization yard, and the outlet of the drying and grinding machine is connected to the granulation unit;

[0011] The granulation unit comprises a double-roll granulator, a rotary kiln and a grate cooler. The urban sludge is mixed with the construction waste soil that has been dried and ground, and granulated by the double-roll granulator. The double-roll granulator is connected to the dryer through a belt conveyor. The dried semi-dry ceramsite is sent to the rotary kiln for firing through a hoist. The fired ceramsite is cooled by a high-efficiency grate cooler to obtain a high-strength ceramsite finished product.

[0012] Furthermore, the drying unit also includes a mixing mixer and an aging yard, and the dried and ground construction waste soil and urban sewage sludge are mixed and blended by the mixing mixer, and then sent to the aging yard after mixing.

[0013] Furthermore, the drying unit also includes a biomass hot air furnace, an exhaust gas treatment device, a bag dust collector and a powder silo. The heat source of the dryer is supplied by a rotary kiln and a biomass hot air furnace. The exhaust gas treatment device is connected to the dryer. The dried construction waste is ground by a grinder. The grinder is provided with a bag dust collector. The ground powder is collected by the bag dust collector.

[0014] Furthermore, the granulation unit also includes a buffer bin, into which the dried ceramsite raw material particles are transported.

[0015] Furthermore, the granulation unit also includes a rotary kiln, a quantitative feeder, a fan, a kiln head burner, a screening device, and a ceramsite finished product warehouse. The feed port of the rotary kiln is connected to the quantitative feeder. A fan and a kiln head burner are also arranged on the rotary kiln. After the fired ceramsite is cooled, it is screened by the screening device and then enters the ceramsite finished product warehouse.

[0016] Furthermore, the kiln tail of the rotary kiln is also connected to a flue gas purification device, which has denitrification, desulfurization and dust removal functions. The flue gas treated by the flue gas purification device is discharged after meeting the standards.

[0017] Furthermore, the storage unit is also provided with a metering device and a plunger pump, and the outlet of the sludge bin is provided with a metering device and a plunger. The metering device and the plunger pump can accurately control the amount of wet sludge used in batching, and accurately control the amount of each raw material added in batching, which plays a key role in production stability.

[0018] The advantages of the utility model are as follows: the ceramsite preparation system uses construction waste and urban sludge as raw materials, and utilizes the rotary kiln of the granulation unit for firing in the preparation process, so that the organic matter in the sludge provides a large amount of gas-generating substances for firing the ceramsite; the necessary pores can be formed inside the ceramsite by increasing the sludge proportion, so that the ceramsite has a light and porous structure, and the heavy metals in the sludge are dissolved in the ceramsite structure, so that the construction waste and urban sludge can be combined for treatment, thereby improving the resource utilization rate; and in the ceramsite preparation process, the urban sludge does not need to be dehydrated and filtered, but can be directly used in the batching; during the stirring and mixing During the mixing stage, since the urban sludge itself has a high water content, there is no need to add new water. The leachate from the raw material pile can also be added to the raw materials. When the urban sludge is large and the water content is high, the water content can be reduced by adding construction waste. Not only does it not require additional waste liquid treatment or discharge, it reduces sewage treatment costs and sewage treatment links, and greatly improves the utilization rate of construction waste, ensuring the recycling of construction waste. In the preparation process of expanded clay, no fossil energy is consumed, no water resources are consumed, and no solid waste is generated. Waste liquid, wastewater and waste heat are all effectively utilized, realizing comprehensive energy utilization.

[0019] The granulation unit is also equipped with a buffer bin, which can stabilize the feed amount of expanded clay entering the rotary kiln, make the rotary kiln run stably, reduce production fluctuations, and ensure the stability of expanded clay preparation quantity; there is an aging yard, and the sludge and construction waste after drying and grinding are mixed by a mixer and enter the aging yard. The aging process makes the materials fully mixed and uniform, homogenizes the moisture, and performs ion exchange, so that some silicate minerals are hydrolyzed into cementing substances in contact with moisture, thereby improving the plasticity of the raw materials, and then improving the stability of the granulation production, while reducing the frequent adjustment of the roasting operation of the production line due to changes in the physical properties of the raw materials, and avoiding discontinuity in production.

[0020] In the process of preparing expanded clay, the drying heat source can be taken from the exhaust gas of the expanded clay roasting system, making full use of the waste heat generated by the system and saving energy consumption; the system fuel can be rice bran, and the rice bran ash produced is a material with high silicon content, which can improve the chemical activity of expanded clay. The silicon content in the raw material is relatively high, which is conducive to the formation of a dense and hard skeleton of the expanded clay, and is conducive to the formation of a dense vitrified layer on the surface of the expanded clay. Description of the drawings:

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is the process flow chart of the utility model; Specific embodiment:

[0023] Example 1

[0024] A ceramsite preparation system includes a conveying unit, a storage unit, a drying unit and a granulation unit, and is prepared by the following steps:

[0025] 1.1 Take the construction waste with a moisture content of about 20%, and quantitatively transport it through the receiving hopper, quantitative feeder and belt conveyor, and then transport it to the pre-homogenization yard through the stone remover and roller crusher; use the vertical drying mill to dry the homogenized construction waste to a moisture content of 1%, and grind it to the fineness required for production;

[0026] 1.2 Use a receiving hopper and a plunger pump to transport the municipal sludge to the sludge bin, mix the dried and ground construction waste soil with the municipal sludge with a moisture content of 80% according to the following mass percentage: 76% construction waste soil and 24% municipal sludge, and fully mix and homogenize them in a mixing mixer. The moisture content of the mixture is about 20%;

[0027] 1.3 The mixing mixer is connected to the aging yard through a belt conveyor, and the mixed materials are aged at room temperature in the aging yard for 14 days;

[0028] 1.4 The aged mixture is sent to the roller granulator via a belt conveyor and made into ceramsite raw material particles;

[0029] 1.5 The ceramsite raw material particles are transported to the dryer through the elevator and dried to a moisture content of 1% at a drying temperature of 350-450°C;

[0030] 1.6 The dried ceramsite raw material balls are sent to the buffer bin, and the quantitative feeder is connected to the feed port of the rotary kiln. The ceramsite raw material balls are gradually transported from the buffer bin into the rotary kiln for roasting. The rotary kiln is also equipped with a fan and a kiln head burner. The temperature in the kiln is gradually increased from 400°C to 1200°C. The fired ceramsite falls from the kiln head to the high-efficiency grate cooler, and the finished ceramsite is obtained after cooling. The kiln tail of the rotary kiln is also connected to a flue gas purification device, which has denitrification, desulfurization and dust removal functions. The flue gas treated by the flue gas purification device is discharged after meeting the standards.

[0031] 1.7 The cooled ceramsite products are screened out into ceramsite products of different particle sizes through a screening device, and then enter the ceramsite product warehouse after screening.

[0032] Example 2

[0033] A ceramsite preparation system includes a conveying unit, a storage unit, a drying unit and a granulation unit, and is prepared by the following steps:

[0034] 2.1 Take the construction waste with a moisture content of about 20%, and quantitatively transport it through the receiving hopper, quantitative feeder and belt conveyor, and then transport it to the pre-homogenization yard through the stone remover and roller crusher; use the vertical drying mill to dry the homogenized construction waste to a moisture content of 1%, and grind it to the fineness required for production;

[0035] 2.2 The receiving hopper and the plunger pump are used to quantitatively convey the municipal sludge to the sludge bin. The metering device and the plunger pump are set at the outlet of the sludge bin. The municipal sludge with a moisture content of 65% is mixed with the construction waste soil after drying and grinding through the metering device and the plunger pump. The ingredients are mixed according to the following mass percentage: 70.5% of the construction waste soil and 29.5% of the municipal sludge. The mixture is fully mixed and homogenized in the mixing mixer. The moisture content of the mixture is about 20%;

[0036] 2.3 The mixing mixer is connected to the aging yard through a belt conveyor, and the mixed materials are aged at room temperature in the aging yard for 14 days;

[0037] 2.4 The aged mixture is sent to the roller granulator via a belt conveyor and made into ceramsite raw material particles;

[0038] 2.5 The ceramsite raw material particles are transported to the dryer through a belt conveyor and dried to a moisture content of 1% at a drying temperature of 350-450°C;

[0039] 2.6 The dried ceramsite raw material balls are sent to the buffer bin, and a screw conveyor is connected to the feed port of the rotary kiln. The ceramsite raw material balls are gradually transported from the buffer bin into the rotary kiln for roasting. A fan and a kiln head burner are also provided on the rotary kiln. The temperature in the kiln is gradually increased from 400°C to 1200°C. The fired ceramsite falls from the kiln head to the high-efficiency grate cooler, and the ceramsite finished product is obtained after cooling. The kiln tail of the rotary kiln is also connected to a flue gas purification device, which has denitrification, desulfurization and dust removal. The flue gas treated by the flue gas purification device is discharged after meeting the standards.

[0040] 2.7 The cooled ceramsite products are screened out into ceramsite products of different particle sizes through a screening device, and then enter the ceramsite product warehouse after screening.

[0041] Working principle: The ceramsite preparation system combines construction waste soil and urban sewage sludge to produce ceramsite through the set conveying unit, storage unit, drying unit and granulation unit; the quantitative feeder in the conveying unit can increase or decrease the feeding amount according to the moisture content of the raw materials. Regardless of whether the moisture content of urban sewage sludge is high or low, it can be combined with the stone-removed construction waste soil to prepare ceramsite; the storage unit includes a sludge bin and a pre-homogenization yard. Through the setting of the storage unit, the urban sewage sludge and construction waste soil are processed and stored to form a very stable material supply place, which can quickly respond to material changes. The drying unit includes a drying and grinding machine, through which the materials from the sludge bin and the pre-homogenization yard are dried and ground to ensure that there will be no production problems due to moisture or particles, so that the raw materials for preparing expanded clay are fine and have a moderate moisture content; the granulation unit is equipped with a rotary kiln, a quantitative feeder, a fan, a kiln head burner, a screening device, and an expanded clay finished product warehouse. The expanded clay raw material is fed into the granulation unit so that the raw clay raw material is fired and screened to form classified expanded clay.

[0042] The whole set of equipment is capable of preparing ceramsite completely. Belt conveyors can be selected to transport materials between units. It has a high degree of automation, simple equipment, and is very easy to master and operate.

[0043] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A ceramsite preparation system, characterized in that: It includes a conveying unit, a storage unit, a drying unit and a granulating unit; The conveying unit includes a receiving hopper, a plunger pump, a quantitative feeder, a stone remover and a roller fine crusher; the urban sludge is conveyed to the storage unit through the receiving hopper and the plunger pump; the construction waste soil is received and quantitatively conveyed through the receiving hopper and the quantitative feeder, and is conveyed to the storage unit through the stone remover and the roller fine crusher; The storage unit comprises a sludge bin and a pre-homogenization yard, wherein the sludge bin stores urban sludge through a plunger pump, the pre-homogenization yard stores construction waste through a belt conveyor, and the pre-homogenization yard is connected to a drying unit through a belt conveyor; The drying unit comprises a drying and grinding machine, the inlet of the drying and grinding machine is connected to the pre-homogenization yard, and the outlet of the drying and grinding machine is connected to the granulation unit; The granulation unit comprises a double-roll granulator, a rotary kiln and a grate cooler. The urban sludge is mixed with the construction waste soil that has been dried and ground, and granulated by the double-roll granulator. The double-roll granulator is connected to the dryer through a belt conveyor. The dried semi-dry ceramsite is sent to the rotary kiln for firing through a hoist. The fired ceramsite is cooled by a high-efficiency grate cooler to obtain a high-strength ceramsite finished product.

2. A ceramsite preparation system according to claim 1, characterized in that: The drying unit also includes a mixing mixer and an aging yard. The dried and ground construction waste soil and urban sewage sludge are mixed and blended by the mixing mixer and then sent to the aging yard after mixing.

3. A ceramsite preparation system according to claim 1 or 2, characterized in that: The drying unit also includes a biomass hot air furnace, an exhaust gas treatment device, a bag dust collector and a powder bin. The heat source of the dryer is supplied by a rotary kiln and a biomass hot air furnace. The exhaust gas treatment device is connected to the dryer. The dried construction waste soil is ground by a grinder. The grinder is provided with a bag dust collector. The ground powder is collected by the bag dust collector.

4. A ceramsite preparation system according to claim 1, characterized in that: The granulation unit also includes a buffer bin, into which the dried ceramsite raw material particles are transported.

5. A ceramsite preparation system according to claim 1 or 4, characterized in that: The granulation unit also includes a rotary kiln, a quantitative feeder, a fan, a kiln head burner, a screening device, and a finished ceramsite warehouse. The feed port of the rotary kiln is connected to the quantitative feeder. The fan and the kiln head burner are also arranged on the rotary kiln. After the fired ceramsite is cooled, it is screened by the screening device and then enters the finished ceramsite warehouse.

6. A ceramsite preparation system according to claim 5, characterized in that: The kiln tail of the rotary kiln is also connected to a flue gas purification device.

7. A ceramsite preparation system according to claim 1, characterized in that: The storage unit is also provided with a metering device and a plunger pump, and the metering device and the plunger pump are arranged on the outlet of the sludge bin.

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