CN116809592B - Household garbage fly ash treatment method - Google Patents
Household garbage fly ash treatment method Download PDFInfo
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- CN116809592B CN116809592B CN202310595717.4A CN202310595717A CN116809592B CN 116809592 B CN116809592 B CN 116809592B CN 202310595717 A CN202310595717 A CN 202310595717A CN 116809592 B CN116809592 B CN 116809592B
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 88
- 239000004567 concrete Substances 0.000 claims abstract description 48
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- 238000007789 sealing Methods 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000001914 filtration Methods 0.000 claims abstract description 16
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- 238000009954 braiding Methods 0.000 claims description 17
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- 239000007789 gas Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
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- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 7
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- -1 containing chlorides Chemical class 0.000 description 2
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- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a method for treating fly ash of household garbage, which belongs to the technical field of harmless treatment and comprises the following steps: a supporting roller is arranged on one side of the incinerator, and a material roll is sleeved on the supporting roller. The material roll is unreeled and filtered out of the filter screen, so that the filter screen passes through an air outlet of the incinerator at a certain speed, and fly ash in tail gas is filtered out through the filter screen. And (3) coating a sealing glue on the filter screen after the filtration is completed, and positioning the adsorbed fly ash on the filter screen. The filter screen is provided with a plurality of through holes for concrete to flow, and the filter screen is used as a reinforcing core of a concrete structure by post-treatment. The method for treating the household garbage fly ash provided by the invention avoids the waste of the filter screen, improves the utilization rate of resources, reduces the influence of the fly ash on the environment, saves the resources and reduces the treatment cost.
Description
Technical Field
The invention belongs to the technical field of harmless treatment, and particularly relates to a method for treating household garbage fly ash.
Background
The garbage incineration technology is a technology for carrying out reduction, harmless and recycling treatment on garbage rapidly developed in recent decades, and has the advantages of low requirement on high adaptability pretreatment of garbage, wide application range, simple and convenient operation and maintenance and the like, so that the garbage incineration technology is widely applied to the treatment of urban garbage at present.
However, fly ash produced by incineration of refuse contains a large amount of dioxin. The dioxin is very stable, has a high melting point, is solid at normal temperature, is very insoluble in water, can be dissolved in most organic solvents, is colorless and odorless and fat-soluble, is very easy to accumulate in organisms, and is considered to have great harm to ecological environment and human health.
In the existing treatment process of the incineration of the living garbage, the fly ash needs to be intercepted by a filter screen, the filter screen is replaced after a certain amount of fly ash is piled up on the filter screen, and then the fly ash on the filter screen is subjected to centralized treatment, and the filter screen can only be used once and needs to be singly and specially treated to avoid influencing the environment. In the method, the process is complicated, the waste of resources such as the filter screen is caused, and certain cost is required for treating the fly ash and the filter screen, so that the cost for treating the fly ash is high.
Disclosure of Invention
The invention aims to provide a method for treating fly ash of household garbage, which aims to solve the problems of waste of resources such as a filter screen and the like and higher cost in the subsequent treatment process.
In order to achieve the above purpose, the invention adopts the following technical scheme: the method for treating the fly ash of the household garbage comprises the following steps:
A supporting roller is arranged on one side of the incinerator, and a material roll is sleeved on the supporting roller;
The material roll is unreeled to pass through a filter screen, so that the filter screen passes through an air outlet of the incinerator at a certain speed, and fly ash in tail gas is filtered out through the filter screen;
coating a sealing glue on the filter screen after the filtration is completed, and positioning the adsorbed fly ash on the filter screen;
And forming a plurality of through holes for concrete flow on the filter screen, and performing post-treatment to enable the filter screen to be used as a reinforcing core of a concrete structure.
In one possible implementation, the unwinding of the roll out of the filter screen comprises:
And adjusting the supply amount of oxygen in the incinerator and the unreeling speed of the coil according to the combustion condition in the incinerator.
In one possible implementation, the applying the sealant to the filter screen after the filtering is completed includes:
after the sealing glue is sprayed out from the glue head, the sealing glue completely covers the filter screen through two extrusion rollers.
In one possible implementation manner, the forming a plurality of through holes for concrete flow on the filter screen includes:
and punching the filter screen to form the through hole, and positioning punched materials on the side surface of the filter screen, which does not interfere with the through hole.
In one possible implementation, the performing the post-treatment to use the filter mesh as a reinforcing core for a concrete structure includes:
and (3) paving and connecting reinforcing ribs on the filter screen, so that the reinforcing ribs and the filter screen are used as the reinforcing core together.
In one possible implementation, the laying and connecting the reinforcing ribs on the filter screen includes:
laying the reinforcing ribs on the filter screen according to a preset direction;
binding the reinforcing ribs and the filter screen into an integrated structure through a braiding machine.
In one possible implementation manner, the binding the reinforcing ribs and the filter screen into an integrated structure through a braiding machine includes:
positioning the braiding machine on a side of the incinerator remote from the coil;
According to the unreeling speed of the material roll, the reinforcing ribs are primarily attached to the filter screen by means of the sealing glue according to a preset direction and angle;
And binding work is completed through the braiding machine in the process of synchronously moving the reinforcing ribs and the filter screen.
In one possible implementation manner, the forming a plurality of through holes for concrete flow on the filter screen includes:
Connecting the reinforcing net with the filter net and winding the reinforcing net into the material roll;
In the process of filtering the fly ash, the reinforcing net ensures the smooth state of the filter screen;
After the sealing glue is coated, the reinforcing mesh and the filter mesh are used together as the reinforcing core.
In one possible implementation manner, the forming a plurality of through holes for concrete flow on the filter screen includes:
and cutting three sides of the filter screen to ensure that the cut filter piece is still connected to the filter screen through one side which is not cut and the through hole is formed.
In one possible implementation, after the cut filter is still connected to the filter screen by the uncut edge and the through hole is formed, the method further includes:
the filter sheet is wound around the uncut edge on the reinforcing mesh and the filter sheet, and the position of the filter sheet is ensured to be stable by the sealing glue.
The method for treating the household garbage fly ash has the beneficial effects that: compared with the prior art, in the method for treating the household garbage fly ash, the supporting roller is arranged at one side of the incinerator, the material roll is directly sleeved on the supporting roller, and the filter screen unreeled by the material roll can pass through the air outlet of the incinerator at a certain speed, so that the fly ash in the tail gas of the incinerator is filtered. When the filter screen is provided with the sealing glue, the filter screen is coated with the sealing glue, and the fly ash can be positioned on the filter screen through the sealing glue. And then a plurality of through holes are formed in the filter screen, and the through holes are formed so as to facilitate the flow of concrete in the casting process, and finally the filter screen with the fly ash positioned can be used as a reinforcing core of a concrete structure. According to the application, the fly ash is filtered through the filter screen, the stability of the fly ash is ensured through the sealing glue, and the filter screen finally carrying the fly ash is used as a reinforcing core to improve the reinforcing structure of the concrete structure, so that the waste of the filter screen is avoided, the utilization rate of resources is improved, the influence of the fly ash on the environment is reduced, the resources are saved, and the treatment cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for treating fly ash of household garbage, which is provided by an embodiment of the invention;
FIG. 2 is a schematic diagram showing connection of an incinerator, a material roll and a squeeze roll in fly ash treatment of household garbage according to an embodiment of the present invention;
fig. 3 is a schematic connection diagram of a reinforcing rib and a filter screen according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a filter screen for three-sided cutting according to a third embodiment of the present invention.
In the figure: 1. an incinerator; 2. a material roll; 3. a filter screen; 4. a rubber head; 5. a squeeze roll; 6. reinforcing ribs; 7. braiding machine; 8. and a through hole.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 4, a method for treating fly ash of household garbage according to the present invention will now be described. The method for treating the fly ash of the household garbage comprises the following steps:
a support roll is mounted on one side of the incinerator 1 and a roll 2 is wound on the support roll.
The material roll 2 is unreeled to pass through the filter screen 3, so that the filter screen 3 passes through the air outlet of the incinerator 1 at a certain speed, and fly ash in tail gas is filtered out through the filter screen 3.
And coating sealing glue on the filter screen 3 after the filtration is completed, and positioning the adsorbed fly ash on the filter screen 3.
The filter 3 is provided with a plurality of through holes 8 for flowing concrete, and the filter 3 is used as a reinforcing core of a concrete structure by post-treatment.
The method for treating the household garbage fly ash has the beneficial effects that: compared with the prior art, in the method for treating the household garbage fly ash, the supporting roller is arranged on one side of the incinerator 1, the material roll 2 is directly sleeved on the supporting roller, and the filter screen 3 unreeled by the material roll 2 can pass through the air outlet of the incinerator 1 at a certain speed, so that the fly ash in the tail gas of the incinerator 1 is filtered. After the filter screen 3 has the sealing glue, the filter screen 3 is coated with sealing glue, by means of which the fly ash can be positioned on the filter screen 3. Then, a plurality of through holes 8 are formed in the filter screen 3, and the through holes 8 are formed, so that concrete can flow conveniently in the casting process, and finally the filter screen 3 with fly ash positioned can be used as a reinforcing core of a concrete structure. According to the application, the filter screen 3 is used for filtering the fly ash, the stability of the fly ash is ensured through the sealing glue, and the filter screen 3 carrying the fly ash finally serves as a reinforcing core to improve the reinforcing structure of the concrete structure, so that the waste of the filter screen 3 is avoided, the utilization rate of resources is improved, the influence of the fly ash on the environment is reduced, the resources are saved, and the treatment cost is reduced.
The household garbage incineration technology has been rapidly developed in China in recent years due to high reduction and volume reduction degree. Incineration of household garbage produces incineration fly ash with the mass of 3-5% of that of the original garbage, which contains Zn, cu, cd, pb, cr and other heavy metals, a large amount of soluble salts mainly containing chlorides, and persistent organic pollutants such as dioxin, and is internationally recognized hazardous waste. Fly ash is a Ca-Si-Al based material and has potential as a building material. At present, the fly ash is mainly used as a cement production raw material in the aspect of building materials, and dioxin is eliminated and heavy metal is melted and solidified at high temperature by utilizing the high-temperature environment of a cement kiln. However, the cement kiln co-treatment of the fly ash has a limitation, the adding proportion of the fly ash subjected to water washing and dechlorination by the existing industrial and stable operation cement kiln co-treatment fly ash project is not more than 4%, and compared with the amount of the waste incineration fly ash generated each year, the accommodation of the cement kiln is very limited.
In technical Specification for pollution control of fly ash from incineration of household garbage (HJ 1134-2020), other utilization modes of fly ash treatment products other than cement clinker production are proposed, and the total content of dioxin residues in the treatment products should not exceed 50ng-TEQ/kg. Therefore, there is a need to find other effective and feasible resource utilization technologies, and control of dioxin is the biggest difficulty in the garbage incineration fly ash resource utilization technology. The high-temperature sintering and the high-temperature melting are carried out by utilizing high temperature to decompose dioxin in the fly ash.
At present, the way of recycling the fly ash through building materials mainly comprises cement production, concrete production, brick making, roadbed paving, dykes and the like, but most of building materials produced by the fly ash are silicate building materials, especially when the fly ash is used for recycling the brick, the products are building material brick products mainly composed of calcium silicate crystals, the mechanical property and the environmental friendliness are slightly poor, especially the stabilizing and curing effects of heavy metals are required to be improved, the application range of the fly ash recycling brick is limited, and the market and development of the fly ash recycling brick are also limited.
From the above statement, it is known that, since the domestic waste generates a certain amount of fly ash after combustion, and a large amount of heavy metal elements exist in the fly ash, if these elements are directly buried, serious consequences are caused to surrounding water bodies, environments and the like, so that a specific sealing treatment is performed at present.
In some embodiments of the method for treating fly ash of household garbage provided by the application, the unreeling of the material roll 2 from the filter screen 3 comprises:
The supply amount of oxygen in the incinerator 1 and the unreeling speed of the coil 2 are adjusted according to the combustion condition in the incinerator 1.
Along with the continuous development of modern life, daily household garbage amount is increased, garbage is burned under normal conditions, a large amount of oxygen is required to be introduced to ensure complete burning, more importantly, a large amount of fly ash is generated in the burning process, and elements in the fly ash generated by garbage burning are relatively complex and have relatively strong pollution, so that the fly ash needs to be adsorbed intensively through a filter screen 3 and the like to prevent the fly ash from being emitted into the air.
If the filter 3 is of a split type, i.e. the filter 3 is of a single sheet form. Then, as the amount of fly ash on the filter screen 3 increases, the resistance of gas circulation is larger, which affects the entry of oxygen to a certain extent, and more importantly, when the filter screen 3 needs to be replaced, there is a filtration space, and the filtration effect is finally affected.
In order to realize the recovery of energy sources and reduce the consumption of resources, a supporting roller is arranged on one side of the incinerator 1, a material roll 2 is arranged on the supporting roller, the incineration of household garbage is continuously carried out in the actual process, the supporting roller is required to continuously unwind the material roll 2 according to the incineration speed, the unwound filter screen 3 passes through the air outlet of the incinerator 1, so that the fly ash can be intercepted, and the fly ash is blocked on the lower surface of the filter screen 3.
By the arrangement, the fly ash can be filtered continuously.
In some embodiments of the method for treating fly ash of household garbage provided by the present application, referring to fig. 2, coating the filter screen 3 after filtration with the sealant includes:
After the sealing glue is sprayed out from the glue head 4, the sealing glue completely covers the filter screen 3 through the two extrusion rollers 5.
In the practical application process, the fly ash can be sufficiently filtered through the filter screen 3, but it should be pointed out that, at this time, although the fly ash is accumulated on the filter screen 3, the connection force between the fly ash and the filter screen 3 is poor, and when the filter screen 3 is subjected to vibration or external wind, the fly ash is separated from the filter screen 3, so that the centralized treatment of the fly ash cannot be effectively completed.
For the above reasons, in the present application, the squeeze rollers 5 are provided between the braiding machine 7 and the incinerator 1, the number of squeeze rollers 5 is two, the two squeeze rollers 5 are disposed in parallel, and a gap for the filter screen 3 to pass through exists between the two squeeze rollers 5. To complete the injection, two glue heads 4 may be provided on the side of the squeeze roller 5 near the incinerator 1. The two rubber heads 4 are distributed on the upper side and the lower side of the filter screen 3. After the fly ash is intercepted on the filter screen 3 by the gas of the incinerator 1, the glue sprayed from the glue head 4 contacts the fly ash and the filter screen 3 as the filter screen 3 is carried out from one side of the incinerator 1, and then the sealing glue is uniformly coated on the filter screen 3 by the two squeeze rollers 5, more importantly, the fly ash and the like can be sealed on the filter screen 3.
In some embodiments of the method for treating fly ash of household garbage provided by the present application, referring to fig. 3, the step of forming a plurality of through holes 8 for concrete flow on the filter screen 3 includes:
the filter 3 is punched to form a through hole 8, and the punched material is positioned on the side surface of the filter 3 which does not interfere with the through hole 8.
The through-holes 8 can be formed in the filter 3 by punching, but if the cut-out part of the filter 3 is discarded directly, it is still environmentally influencing, for which purpose the punching is done after the application of the sealing glue and the punched material needs to be relocated on the filter 3, while it is ensured that the relocated part of the filter 3 does not influence the size of the through-holes 8, i.e. the flow of the concrete.
In some embodiments of the method for treating fly ash of household garbage provided by the present application, referring to fig. 2 and 3, performing post-treatment to make the filter screen 3 be used as a reinforcing core of a concrete structure includes:
The reinforcing ribs 6 are paved and connected on the filter screen 3, so that the reinforcing ribs 6 and the filter screen 3 are used as a reinforcing core together.
Although the conventional filter 3 for air filtration has a good filtering effect, the filter 3 of this type has a low structural strength. Although the application needs to intercept fly ash through the filter screen 3, the application further needs to have certain structural strength of the filter screen 3, so that the stability of the concrete member can be improved. For this reason, the strength of the filter net 3 itself can be improved or the filter net 3 and the reinforcing ribs 6 can be connected, thereby forming a reinforcing structure that can be applied to construction. This places certain demands on the structural strength of the filter 3 and the reinforcing ribs 6.
For the above reasons, it is required that the filter net 3 of the present application can filter out fly ash while having a certain structural strength, that is, can be used as a reinforcing core of a concrete structure after concrete is poured. For this purpose, the filter screen 3 of the present application is composed of two parts, and the filter screen 3 includes a reinforcing mesh and a plurality of filter blocks fixed on the reinforcing mesh.
The rib net consists of connecting strips which are connected transversely and longitudinally, and the connecting strips are usually made of metal materials or nonmetal materials with certain structural toughness. The diameter of the single connecting strip is smaller, so that a plurality of connecting strips are wound to form a strand, the strand and the strand are connected transversely and longitudinally to form a rib net, a plurality of connecting holes are formed in the rib net, the filter block is fixed on the connecting holes at the moment, and finally the filter net 3 is formed through the rib net and the filter block.
In some embodiments of the method for treating fly ash of household garbage provided by the present application, referring to fig. 2 and 3, laying and connecting the reinforcing ribs 6 on the filter screen 3 includes:
The reinforcing ribs 6 are paved on the filter screen 3 according to a preset direction.
The reinforcing ribs 6 and the filter screen 3 are bound into an integrated structure through the braiding machine 7.
In the conventional method, in order to perform centralized treatment on fly ash, the fly ash is filtered through a filter screen 3. After a certain amount of fly ash has been deposited on the filter 3, the separation of the fly ash from the filter 3 can be achieved by vibration or the like. However, at this time, a certain amount of fly ash is still mixed in the filter screen 3, so that the filter screen 3 using the method cannot be used continuously, and only centralized treatment can be performed.
The method of the application can recycle the fly ash on one hand, thereby avoiding the pollution to the environment and the cost required by the independent treatment, and on the other hand, can reutilize the filter screen 3, strengthen the integral structural strength of the concrete and improve the utilization rate of resources.
For some cases where the thickness of the concrete structure is large, in order to further increase the structural strength of the concrete structure after casting, the reinforcing ribs 6 need to be fixed on the filter screen 3. After the reinforcing ribs 6 are fixed on the filter screen 3, the reinforcing ribs 6 and the filter screen 3 are cast in the concrete, the filter screen 3 is used for positioning fly ash, and the reinforcing ribs 6 can improve the overall stability of the structure.
In recent years, domestic garbage incineration power generation in China is rapidly developed. The development of the incineration technology brings about nearly 500 ten thousand tons of fly ash per year, and accounts for nearly 12% of the total amount of various dangerous wastes per year in China.
The disposal of fly ash, a hazardous industrial solid waste, is one of the environmental problems currently in need. At present, the main treatment mode of the hazardous industrial solid waste, namely the fly ash, is to carry out landfill after solidification and stabilization. Although the 2016 edition of the national hazardous waste directory implements exemption management on the stabilized fly ash entering a household garbage landfill, the landfill is only a expedient under the current situation of garbage surrounding cities. In China, the main aim of common industrial solid waste is to recycle, and the industrial solid waste is rich in Si, al, ca and other elements, so that the building material production industry is the maximum absorption and utilization industry of the industrial solid waste. According to statistics of China environmental protection industry association, in 2013, 43% of tailings, 68% of coal gangue, 93% of fly ash and most of steel smelting slag in China are used for building material production, road construction and other aspects. The main elements of the hazardous industrial solid waste of the fly ash are Si, al, fe, mg, ca, K, na and Cl, siO2, A12O3, caO, fe2O3 and Na2O, K O are commonly existing in the fly ash, the SiO2 content is 6.35-35.5%, the A12O3 content is 0.92-13.7%, the Fe2O3 content is 0.63-10.5%, the CaO content is 16.6-45.4%, and MgO and Na2O, K O respectively account for 1% -5%. The element composition provides a necessary material basis for the recycling of the fly ash building materials. The utilization of the fly ash as a resource is a main research and application direction in the future.
In some embodiments of the method for treating fly ash of household garbage provided by the present application, referring to fig. 2, binding the reinforcing ribs 6 and the filter screen 3 into an integrated structure by the braiding machine 7 includes:
The braiding machine 7 is positioned on the side of the incinerator 1 remote from the material roll 2.
According to the unreeling speed of the material roll 2, the reinforcing ribs 6 are primarily attached to the filter screen 3 by means of the sealing glue according to the preset direction and angle.
The binding work is completed by the braiding machine 7 in the process of synchronously moving the reinforcing ribs 6 and the filter screen 3.
It should be noted that, the reinforcing ribs 6 have three structural forms, including strip, net and fiber, and at this time, different types of the reinforcing ribs 6 are required to be adopted according to different application scenarios, so as to finish the reinforcement of the concrete.
The object of the present application is to treat fly ash while producing a component which can improve the stability of a concrete structure as a reinforcing core for the concrete. In practical application, the reinforcing structure formed by the filter screen 3 and the reinforcing ribs 6 is fixed in the template, then concrete is injected into the template, the concrete finally can overflow the reinforcing structure, and after the concrete is solidified, the reinforcing structure is positioned in the structure, so that the stability is improved.
In order to fix the reinforcing ribs 6 on the filter screen 3, a braiding machine 7 may be disposed on one side of the incinerator 1 away from the supporting roller, the reinforcing ribs 6 can be positioned on the filter screen 3 by the braiding machine 7 no matter what shape of the reinforcing ribs 6, needles of the braiding machine 7 pass through the filter screen 3 in a reciprocating manner, and positioning wires are guided to bind the reinforcing ribs 6 on the filter screen 3.
In some embodiments of the method for treating fly ash of household garbage provided by the application, the step of forming a plurality of through holes 8 for concrete flow on the filter screen 3 comprises the following steps:
the reinforcing mesh and the filter mesh 3 are connected and wound into a roll 2.
In the process of filtering the fly ash, the reinforcing net ensures the flat state of the filter screen 3.
After the application of the sealing glue, the reinforcing mesh together with the filter screen 3 serves as a reinforcing core.
For special occasions or the structure itself is smaller in thickness, if the reinforcing ribs 6 are fixed on the filter screen 3 again, the reinforcing ribs 6 and the filter screen 3 are larger in overall thickness, the occupied volume is larger, the strength of the final structure is smaller, and cracks are easy to occur.
For the above reasons, it is necessary to improve the structural strength of the filter 3, but the filter 3 itself needs to have a certain filtering function, so that the structural strength is difficult to be improved greatly. Based on this, the reinforcing mesh can be directly bound preliminarily with the filter mesh 3 of the whole block, and then wound together with the filter mesh 3 and placed on the support roller. In the unreeling process of the support roller, the reinforcing net is arranged above the filter screen 3, so that the smoothness of the filter screen 3 can be ensured. After the glue is applied, the through holes 8 with corresponding sizes need to be formed at the positions corresponding to the filter screens 3, and the existence of the reinforcing mesh does not interfere with the forming of the through holes 8.
In some embodiments of the method for treating fly ash of household garbage provided by the present application, referring to fig. 3 and 4, the step of forming a plurality of through holes 8 for concrete flow on the filter screen 3 includes:
the three sides of the filter screen 3 are cut, so that the cut filter sheet is still connected to the filter screen 3 through the uncut side, and a through hole 8 is formed.
In the practical application process, the fly ash in the flue gas generated by the incinerator 1 needs to be thoroughly filtered, at this time, the pores on the filter screen 3 should meet the requirement, that is, larger through holes should not exist on the filter screen 3, but if the filter screen 3 which is not subjected to any treatment is directly combined with the reinforcing ribs 6 for casting, the layering of concrete can be caused due to the existence of the filter screen 3, because the concrete cannot effectively flow through the filter screen 3, a gap exists inside the structure due to the existence of the filter screen 3, and the gap can seriously affect the structural strength and stability of the structure.
In order to solve this problem, in the present application, it is necessary to provide through holes 8 at corresponding positions of the filter screen 3 after the reinforcing ribs 6 are connected to the filter screen 3, because the through holes 8 are present when the entire reinforcing structure is initially positioned and concrete is injected, the concrete can flow through the through holes 8 at both sides of the filter screen 3, and by the above arrangement, it is ensured that the filter screen 3 does not affect the structural stability of the entire structure.
In practical application, in order to avoid that part of the filter sheet falls off from the filter screen 3 at the same time as the through holes 8 are processed, three sides of the filter screen 3 may be cut, for example, square. Three square sides of the filter screen 3 are cut, at this time, the cut filter sheet can swing around the last side, and the cut portion forms the through hole 8.
In some embodiments of the method for treating fly ash of household garbage provided by the present application, referring to fig. 3 and 4, after the cut filter sheet is still connected to the filter screen 3 through the uncut edge and the through hole 8 is formed, the method further includes:
the filter sheet is wound around the uncut side on the reinforcing mesh and the filter screen 3, and the stability of the position of the filter sheet is ensured by means of the sealing glue.
Therefore, the pores on the filter screen 3 are smaller, and fly ash is adsorbed on the filter screen 3, if the casting is directly carried out without any treatment, delamination easily occurs in the concrete, and therefore, the filter screen 3 is required to be provided with through holes 8.
After the through holes 8 are made, the cut part will not separate from the original filter 3, since if it were, most fly ash would not be recycled, i.e. after the through holes 8 are made, the cut part is still connected to the filter 3 and the cut part can swing along one side.
Since the sealing glue is already applied at this point, the flow of concrete may still be hindered if no further measures are taken if the filter sheet of the cut-out area is not treated. For this purpose, the cut filter sheet can be wound around a web, which ultimately results in the filter screen 3 forming a grid-like shape. By winding, the connection reliability between the reinforcement net and the filter block can be improved, and more importantly, the concrete flow is not influenced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The method for treating the fly ash of the household garbage is characterized by comprising the following steps of:
A supporting roller is arranged on one side of the incinerator, and a material roll is sleeved on the supporting roller;
The material roll is unreeled to pass through a filter screen, so that the filter screen passes through an air outlet of the incinerator at a certain speed, and fly ash in tail gas is filtered out through the filter screen;
coating a sealing glue on the filter screen after the filtration is completed, and positioning the adsorbed fly ash on the filter screen;
forming a plurality of through holes for concrete flow on the filter screen, and performing post-treatment to enable the filter screen to be used as a reinforcing core of a concrete structure;
the coating of the sealing glue on the filter screen after the completion of the filtration comprises the following steps:
after the sealing glue is sprayed out from the glue head, the sealing glue completely covers the filter screen through two extrusion rollers;
the forming of a plurality of through holes for concrete flow on the filter screen includes:
Punching the filter screen to form the through hole, and positioning punched materials on the side surface of the filter screen, which does not interfere with the through hole;
the post-treatment to make the filter net used as a reinforcing core of a concrete structure comprises the following steps:
and (3) paving and connecting reinforcing ribs on the filter screen, so that the reinforcing ribs and the filter screen are used as the reinforcing core together.
2. A method of treating fly ash from household garbage as in claim 1, wherein the unreeling of the roll from the filter screen comprises:
And adjusting the supply amount of oxygen in the incinerator and the unreeling speed of the coil according to the combustion condition in the incinerator.
3. A method of treating fly ash from household waste as claimed in claim 1, wherein said laying and attaching reinforcing ribs on said filter screen comprises:
laying the reinforcing ribs on the filter screen according to a preset direction;
binding the reinforcing ribs and the filter screen into an integrated structure through a braiding machine.
4. A method of treating fly ash from household garbage as claimed in claim 3, wherein said binding of said reinforcing ribs and said filter net into an integral structure by a braiding machine comprises:
positioning the braiding machine on a side of the incinerator remote from the coil;
According to the unreeling speed of the material roll, the reinforcing ribs are primarily attached to the filter screen by means of the sealing glue according to a preset direction and angle;
And binding work is completed through the braiding machine in the process of synchronously moving the reinforcing ribs and the filter screen.
5. A method of treating fly ash from household garbage as claimed in claim 1, wherein said forming a plurality of through holes in said filter screen for concrete flow comprises:
Connecting the reinforcing net with the filter net and winding the reinforcing net into the material roll;
In the process of filtering the fly ash, the reinforcing net ensures the smooth state of the filter screen;
After the sealing glue is coated, the reinforcing mesh and the filter mesh are used together as the reinforcing core.
6. A method of treating fly ash from household garbage as claimed in claim 5, wherein said forming a plurality of through holes in said filter screen for concrete flow comprises:
and cutting three sides of the filter screen to ensure that the cut filter piece is still connected to the filter screen through one side which is not cut and the through hole is formed.
7. A method of treating fly ash from household garbage as claimed in claim 6, further comprising, after said passing said cut filter sheet through an uncut edge thereof to said filter screen and forming said through-hole:
the filter sheet is wound around the uncut edge on the reinforcing mesh and the filter sheet, and the position of the filter sheet is ensured to be stable by the sealing glue.
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| CN116809592A (en) | 2023-09-29 |
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