TWI633066B - Method for making recycled building materials from sewers and industrial sludge - Google Patents

Abstract

A method for making recycled building materials from sewers and industrial sludges, comprising a feeding step of transporting the sludge to a suspension preheating device, suspending the sludge by a cyclone flow and simultaneously preheating, and then the sludge is subjected to a cyclone The airflow is concentratedly transported to a rotary kiln, and the exhaust gas generated by the preheating is circulated in the suspension preheating device with the cyclone flow; in a combustion step, the sludge is burned at a temperature in the rotary kiln, and the unburned complete component is Will enter the suspension preheating device with the generated gas in the form of dust, and separate from the gas and then enter the rotary kiln for combustion; a mixing step, mixing the ash with the cement; a molding step, The mixed ash and cement are pressed into a specific shape of the building material by pressure; and a curing step is performed to maintain the prepared building material.

Description

Method for making recycled building materials from sewers and industrial sludge

The invention relates to a method for making recycled building materials, in particular to a method for making sewage pipes and industrial sludge into recycled building materials.

At a time when environmental awareness is gradually rising, in addition to conserving resources, it is also a very beneficial way to protect the environment and economic development by recycling waste that could not be used after special treatment. There are quite a few types of waste that can be regenerated by special treatment, including garbage, sludge, kitchen waste, or waste wood. Among them, the sludge can be converted into recycled building materials, organic fertilizers, or planted soils through special treatment methods, and the metal or other components in the sludge can be extracted and reused, and can be processed at a low cost. A product with high economic value.

The sludge produced by the water treatment, for example, sewage sludge and industrial sludge, contains components such as moisture, organic matter, metals, sand, etc., and the sludge is subjected to special treatment to be converted into recycled building materials. Need to go through complicated processing steps. Among the sludges, especially organic substances having an odor, must be thoroughly removed so as not to cause odors in the produced recycled building materials. In the process of treating sludge, it is common to add a chemical agent and then heat-treat it into ash which can be mixed into the building material. Heat treated After the ash, it is handed over to the manufacturer or the manufacturer for mixing, pressurization, etc., and is manufactured into recycled building materials.

Conventional methods for treating sludge are prone to poor combustion efficiency due to temperature unevenness, excessive heating rate, or insufficient burning time during heat treatment, so that excess heat is consumed during heat treatment. Energy, and due to poor combustion efficiency, the available components are lost due to incomplete combustion, and the available components of the sludge cannot be fully utilized. In addition, as the component of the gas escape is usually in the form of dust, if the exhaust gas generated by the combustion is directly removed, serious air pollution problems will be caused, and in the subsequent exhaust gas treatment, complicated steps are required to treat the exhaust gas. Emissions for gases that meet emission standards. Therefore, practitioners in related fields have all made improvements to the above-mentioned problems in order to make the sludge produced by the water treatment into a recycled building material in a manner that is more energy-efficient, more efficient in combustion, and easier to treat the exhaust gas. .

Accordingly, it is an object of the present invention to provide a method for producing a reclaimed building material by providing a sewer having a high combustion efficiency in a combustion process and being easily subjected to exhaust gas treatment and industrial sludge.

Thus, the method for producing a recycled building material from the sewer and the industrial sludge of the present invention comprises a feeding step, a burning step, a mixing step, a forming step, and a curing step.

The burning step is to transport the sludge to a suspension preheating device, so that the sludge is suspended by the cyclone flow and simultaneously preheated, followed by the sludge. Concentrated and transported to a rotary kiln due to the cyclone flow, the exhaust gas generated by the preheating process is circulated along with the cyclone flow in the suspension preheating device, and during the cycle, the exhaust gas and the sludge are exchanged heat. Increase the temperature of the sludge and reduce the temperature of the exhaust gas.

The burning step is to raise the temperature in the rotary kiln to burn the sludge with an open flame, and the unburned component will circulate in the form of dust with the generated gas into the suspension preheating device and be separated from the gas. The kiln is re-entered for combustion, and the sludge is subjected to heat treatment to form ash, and the gas and the exhaust gas are discharged together from the suspension preheating device. Since the cyclone gas stream has been separated by the cyclone airflow in the suspension preheating device, the exhausted gas and the exhaust gas are easier to perform subsequent processing.

The mixing step is to mix the ash with the cement in a specific ratio to replace part of the cement material.

The molding step is to pressurize the mixed ash and cement into a specific shape of the building material.

The curing step is to maintain the prepared building materials to prevent the formed building materials from deteriorating in poor environmental conditions.

The effect of the invention is that the sludge is preheated by the suspension preheating device in the feeding step, and the temperature of the sludge is increased by means of exhaust gas circulation, and the temperature is increased in the rotary kiln during the burning step. The sludge is burned, and the unburned components enter the suspension preheating device with the generated gas, and are collected again and re-entered into the rotary kiln for combustion, so that the combustion of the sludge has better combustion efficiency. The generated exhaust gas has been discharged by the suspension preheating device to discharge the dust, so that it is easier to carry out subsequent processing.

11‧‧‧ Feeding steps

12‧‧‧ burning steps

13‧‧‧mixing steps

14‧‧‧Molding steps

15‧‧‧ Maintenance steps

21‧‧‧suspension preheating device

211‧‧‧Cyclone Dust Collector

212‧‧‧Exhaust pipe

22‧‧‧ Rotary Kiln

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a flow chart illustrating an embodiment of a method for making a recycled building material from a sewer and an industrial sludge of the present invention; And Fig. 2 is a schematic view showing a suspension preheating device and a rotary kiln used in the embodiment.

Referring to Figure 1, an embodiment of a method of making a reclaimed building material for a sewer and industrial sludge of the present invention comprises a feed step 11, a combustion step 12, a mixing step 13, a forming step 14, and a curing step 15.

Referring to Figures 1 and 2, the feeding step 11 is to transport the sludge to a suspension preheating device 21, which comprises a plurality of cyclone dust collections arranged in sequence and connected to each other for containing sludge. The unit 211 has an exhaust gas discharge pipe 212 connected to one of the cyclone dust collecting units 211. The number of the cyclone dust collecting units 211 is 3 to 7, as shown in FIG. 2, which is the aspect of the four cyclone dust collecting units 211.

In the cyclone dust collecting unit 211, the accommodated sludge is suspended and simultaneously preheated by a cyclone flow having different wind speeds and strengths. Since the sludge contained in each of the cyclone dust collecting units 211 is in a suspended state, it has a relatively large contact surface area, and the preheating time can be greatly shortened with respect to the sludge which is not in a suspended state. The sludge contained in each of the cyclone dust collecting units 211 is not only preheated by the cyclone airflow in a suspended state, but also due to the downward flow generated by the cyclone airflow. And concentratedly transported to the next cyclone dust collecting unit 211, each cyclone dust collecting unit 211 treats the sludge with a cyclone airflow of different wind speeds and strengths. The sludge which is preheated and collected intensively through the cyclone dust collecting unit 211 is finally sent to a rotary kiln 22. It should be particularly noted that the exhaust gas generated by the preheating process is circulated together with the cyclone flow in the suspension preheating device 21, and during the cycle, the exhaust gas and the sludge are exchanged heat, thereby increasing the temperature of the sludge and The temperature of the exhaust gas is lowered, and the heat energy is more reliably utilized in the preheated sludge by heat exchange, thereby achieving an energy saving effect.

Referring again to Figures 1 and 2, the combustion step 12 is to raise the temperature in the rotary kiln 22 to burn the sludge at a temperature range of 150 to 800 degrees Celsius, since the sludge is already in the suspension preheating device 21 In the preheating, the sludge can reach the required temperature in the rotary kiln 22 quickly, and the energy consumed in the heating of the rotary kiln 22 can be reduced by preheating in advance. Since a circulating air flow is applied to the rotary kiln 22, the rotation of the rotary kiln 22 itself can be used to continuously turn the sludge, thereby allowing the sludge to be uniformly heated, thereby improving the heating efficiency. During the combustion process, due to the circulation of the circulating airflow, the unburned components will enter the suspension preheating device 2 in a dust form with the gas generated by the combustion, and pass through the cyclone dust collecting unit 211. The treatment is separated from the gas and re-enters the rotary kiln 22 for combustion. The gas generated by the combustion in the cyclone dust collecting unit 211 is circulated in the suspension preheating device 22 together with the exhaust gas generated during the preheating, and exchanges heat with the dust in the cyclone dust collecting unit 211. Then, it is discharged through the exhaust gas discharge pipe 212 of the suspension preheating device 22.

Using the above method, it can ensure that the sludge can be burned more completely. The organic component which burns, especially in the sludge, can be burned and reacted as a gas, so as to avoid the odor of the produced building material due to incomplete combustion, and the sludge passes through the burning step 12 Will form ash. It is to be noted that, in the suspension preheating device 22, the dust has been separated by the cyclone airflow, and the temperature of the exhausted gas and the exhaust gas is lowered by heat exchange, and thus discharged through the exhaust gas discharge pipe 212. Gas and exhaust gases are easier to handle.

The position of the exhaust gas discharge pipe 212 is designed according to the cyclone flow parameters in the cyclone dust collecting unit 211, and the cyclone dust collecting unit 211 may be based on the expected warming effect or the dust collecting effect. The arrangement is arranged in order, and the cyclone dust collecting units 211 are respectively defined as a plurality of levels. For example, if the number of the cyclone dust collecting units 211 is four, the cyclone dust collecting units 211 are defined as four levels. The position at which the exhaust gas discharge pipe 212 is disposed can be determined by judging the gas and the dust in each level. Under the normal circumstances, the exhaust gas discharge pipe 212 is connected to the cyclone dust collecting unit 211 defined as the first level or the last level, but the position set by the exhaust gas discharge pipe 212 may be changed according to actual use. Design, not limited to the above position.

Continuing to refer to FIG. 1 and FIG. 2, the mixing step 13 is to mix the ash with the cement in a specific ratio to replace part of the cement material. Among them, the proportion of ash to replace cement must first analyze the ash formed by burning different types of sludge, and then decide according to the physical properties of ash, to avoid the excessive proportion of ash and slag. The building materials have insufficient strength The problem.

The molding step 14 is a building material having a specific shape by mixing the mixed ash and cement in a pressurized manner. Among them, the pressure range of pressurization is 25 to 30 tons per square meter, and particularly when pressurized at a pressure of 30 tons per square meter, a relatively strong recycled building material can be produced.

The curing step 15 is to maintain the prepared building materials to prevent the formed building materials from deteriorating in poor environmental conditions and affecting the strength. After the curing step 15, the finished building material can be practically applied to various construction projects. The following waterways and industrial sludges are made into recycled building materials. They are products that can be reused from waste that cannot be used. They not only implement the environmental protection concept of resource recycling, but also make practical recycled products with low-cost raw materials. It is also quite helpful for economic development.

In summary, the sewer and industrial sludge produced by the water treatment can be preheated in the suspension preheating device 21 in a suspended state, and concentratedly transported to the rotary kiln 22 for combustion, and the components that are not completely burned. It will be collected by the suspension preheating device 21 and sent again to the rotary kiln 22 for combustion, thereby ensuring good combustion efficiency during combustion. The gas generated by the combustion and the exhaust gas generated by the preheating are circulated in the suspension preheating device 21, and are discharged through the exhaust gas discharge pipe 212 after the dust is separated, so that the discharged gas and the exhaust gas are easily subjected to subsequent treatment. The ash generated by the burning step 12 can be mixed with the cement and made into a recycled building material by pressurization, so that the object of the present invention can be achieved.

However, the above is only an embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the application according to the present invention is The simple equivalent changes and modifications made by the scope of the patent and the contents of the patent specification are still within the scope of the invention.

Claims (6)

A method for making recycled building materials by sewage and industrial sludge, comprising: a feeding step, conveying the sludge to a suspension preheating device, suspending the sludge by a cyclone flow and simultaneously preheating, followed by sludge The cyclone flow is concentrated and sent to a rotary kiln. The exhaust gas generated by the preheating process is circulated along with the cyclone flow in the suspension preheating device. During the cycle, the exhaust gas and the sludge are exchanged heat, thereby improving The temperature of the sludge and the temperature of the exhaust gas, the suspension preheating device comprises a plurality of cyclone dust collecting units arranged in sequence and connected to each other, the cyclone dust collecting units are used for accommodating the sludge, and respectively have different wind speeds and strengths The cyclone airflow suspends and concentrates the sludge to the rotary kiln; in a combustion step, the temperature is raised in the rotary kiln and the sludge is burned by an open flame, and the unburned complete component is generated by the dust type. The gas enters the suspension preheating device to circulate, separates from the gas and enters the rotary kiln again for combustion, and the sludge is heat treated to form ash, and the gas and the exhaust gas are suspended from the same Preheating device discharge; a mixing step, mixing the ash with the cement; a molding step, pressing the mixed ash and cement into a specific shape of the building material by pressure; and a curing step, The finished building materials are cured. The method for preparing a recycled building material according to the sewer and the industrial sludge according to claim 1, wherein the number of the cyclone dust collecting units is 3 to 7. The sewer and industrial sludge as described in claim 1 are made into recycled building materials. The method, wherein the suspension preheating device further comprises an exhaust gas discharge pipe connected to one of the cyclone dust collecting units. A method for producing a recycled building material according to claim 1, wherein the temperature in the rotary kiln is 150 to 800 degrees Celsius. A method for producing a recycled building material according to claim 1, wherein the pressure in the molding step ranges from 25 to 30 tons per square meter. A method for producing a recycled building material by the sewer and industrial sludge according to claim 5, wherein the pressure of the pressurization is 30 tons per square meter.