KR100617265B1 - Long life waste articles delivering pipe of suction operated and composition for waste articles delivering pipe and waste treatment system having the same - Google Patents

Abstract

The present invention relates to a waste conveying pipe, wherein in the waste conveying pipe, C is 1.0 to 3.5wt%, Si is 2.0wt% or less, Mn is 2.0wt% or less, Cr is 14.0 to 26.0wt%, Mo is 3.0wt Less than or equal to%, less than or equal to 3.0 wt% Ni, less than or equal to 5.0 wt% of a mixture of Ti, V, W and Co, the remaining amount of which contains Fe, a composition for producing the same, and a waste disposal system using the same To provide. Through such a composition, it is possible to improve the wear resistance, impact resistance and corrosion resistance of the pipe.

Waste, conveying, pipe, wear resistant, impact resistant, corrosion resistant

Description

LONG LIFE WASTE ARTICLES DELIVERING PIPE OF SUCTION OPERATED AND COMPOSITION FOR WASTE ARTICLES DELIVERING PIPE AND WASTE TREATMENT SYSTEM HAVING THE SAME}

1 is a conceptual diagram of a pneumatic transfer system for conventionally transporting waste into a pipe.

Figure 2 is a graph showing the wear resistance and impact resistance according to the hardness.

Figure 3 is a picture of the appearance of the pipe according to the embodiment.

Figure 4 is a color inspection photograph testing the impact resistance characteristics of the hard facing welding material

5 is a photograph of the impact resistance characteristics of the development material according to the present invention.

Figure 6 is a photograph comparing the impact resistance characteristics of basalt basalt ceramic and development materials according to the present invention.

Figure 7 is a photograph after testing the wear resistance of each material.

8 is a microstructure photograph of a hard facing welding material.

9 is a microstructure photograph of the development material according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: Inlet 10: Garbage

20: pipe 30: toilet

40: incinerator

The present invention relates to a waste conveying pipe, and more particularly, to a waste conveying pipe for air conveyance having excellent wear resistance and impact resistance and excellent corrosion resistance.
In general, household waste, or garbage, was collected by door collection. They put garbage in a separate garbage bag and put it outside the house, and the garbage truck came and collected it. However, this has caused a lot of problems in terms of environmental hygiene because the garbage bags should be left outside the house for a certain time.
In order to solve this problem, we developed waste pipeline transportation system by air transfer from Sweden (C company) in 1960s. Also known as Pneumatic transfer system, it has been applied to Sweden, Spain and Japan. Some of these systems are also applied in the Netherlands, the Netherlands, Hong Kong and Singapore.
In recent years, the development of new towns in Seoul and Gyeonggi-do has been actively underway, and light rail and garbage pipeline transportation systems (or automatic garbage collection facilities) have been introduced as part of the creation of high value-added living cultures. .
1 is a conceptual diagram of a conventional pneumatic transport system for transporting waste pipes.
Referring to FIG. 1, a conventional waste pipe transport system includes a waste inlet 1 for exposing waste 10 to the outside of the ground, a pipe 20 embedded in the ground for transporting waste 10, and It includes a collecting plant 30 having a suction device 31 for conveying and collecting the waste 10, and an incineration plant 40 for incinerating the collected waste 10.
This is because when the waste 10 is injected into the waste inlet 1, the suction devices 31 start to operate to form a strong air flow, that is, a suction force, in the pipe 20 to suck the waste 10. Due to this, the waste 10 introduced into the inlet 1 is moved to the collection plant 30 in a moment through the pipe 20 and falls into the incinerator 40 bunker.
However, in the case of domestic waste, there may be a flammable material, a non-flammable material of a spoon and a seed, and in a conventional waste pipeline system, the pipe may be bent due to severe impact and wear on a bent pipe, that is, a curved or T-shaped pipe as shown in the drawing. The wear caused a problem that the bent part should be replaced frequently. That is, the pipes used are SS, SC, SCM or ceramic pipes. Since the SS, SC, SCM-based pipes are transported at a speed of 50 to 90 km / hr, holes are generated in the pipe due to impact and abrasion. Due to these perforations, the air pressure is lowered, which causes a problem in that the waste cannot be smoothly transferred. In addition, in the case of ceramic pipes, the wear resistance and slippery properties are excellent, but partial stacking occurs due to iron-based products among non-combustible materials, causing clogging, which makes it difficult to transfer the ceramics. Pore occurs. Accordingly, in the related art, a problem arises in that the pipe needs to be replaced about once a year.

Therefore, in order to solve the above problems, the present invention provides a cast-based carcass (aka KARCAS) containing a high chromium, etc., which is an optimal material bonded to a high compressed air conveyance after examining the wear and abrasion mechanism. It is an object of the present invention to provide a waste conveying pipe excellent in wear resistance, impact resistance and corrosion resistance.

In the waste conveying pipe according to the present invention, C is 1.0 to 3.5wt%, Si is 2.0wt% or less, Mn is 2.0wt% or less, Cr is 14.0 to 26.0wt%, Mo is 3.0wt% or less, Ni is 3.0 Less than or equal to 5.0 wt%, the mixture of Ti, V, W and Co is less than or equal to 5.0 wt%, and the remaining amount provides a waste transport pipe containing Fe.
Here, the weldable pipe is 1.0 to 2.0wt% C, 0.1 to 2.0wt% Si, 0.1 to 2.0wt% Mn, 14.0 to 20.0wt% Cr, 0.1 to 1.0wt% Mo, 0.1 to 1.0wt% Ni 1.0 wt%, Ti, V, W and Co is a mixture of 0.1 to 3.0 wt%, the balance is characterized in that the Fe, the hardness (HS) is 70 ± 20 ,. In this case, the pipe may be manufactured in a straight form, a curved form or a T shape, and may be welded or flange fastened.
If the pipe is applicable using a flange, the pipe is 2.0 to 3.5wt% C, 0.1 to 2.0wt% Si, 0.1 to 2.0wt% Mn, 20.0 to 26.0wt% Cr, 0.1 to 3.0 Mo wt%, Ni is 0.1 to 3.0wt%, Ti, V, W and Co is a mixture of 0.1 to 5.0wt%, the balance comprises Fe, the hardness (HS) is characterized in that 80 ± 20 .
In the composition for waste conveying pipe according to the present invention, C is 1.0 to 3.5wt%, Si is 2.0wt% or less, Mn is 2.0wt% or less, Cr is 14.0 to 26.0wt%, Mo is 3.0wt% or less Ni, 3.0 wt% or less, Ti, V, W and Co is a mixture of 5.0wt% or less, the balance provides a composition for waste transport pipe containing Fe.
In addition, in the waste treatment system for automatically air processing the waste according to the present invention, an inlet for receiving waste, a pipe for carrying the injected waste, and a suction device for collecting and collecting the waste through the pipe And a incinerator for incineration of the waste collected therein, wherein the pipe includes C of 1.0 to 3.5 wt%, Si of 2.0 wt% or less, Mn of 2.0 wt% or less, Cr of 14.0 to 26.0 wt%, Mo is less than 3.0wt%, Ni is less than 3.0wt%, a mixture of Ti, V, W and Co is 5.0wt% or less, the remaining amount provides Fe.
Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. First, looking at the general wear and tear wear and durability can be predicted by the correlation between the action force and the reaction force hardness.
Force and hardness Reaction force and hardness Action HV (about) Reaction force HV (about) SiC 2500 VC, TiC 2500 Al ₂ O ₃ 1800-2000 Cr7C7, M3C 1800-2000 Auartz (sIo ₂ ) 770-900 Hi-C, martensite 770-900 Low melting point ceramic 350-700 austenite 350-700
The table is a table showing the action force and the reaction force, that is, similar hardness materials and Vickers hardness (HV) therebetween. As such, the present invention analyzed the model of the reinforcement phase on the wear material through the analysis of the action force and the reaction model. In other words, when impacted to pipes with iron or ceramic wastes (SiO ₂ , Fe) by impact force at 90km / h, they become fine cracks or grooves on the surface, resulting in a sharp decrease in abrasion resistance or dust. Blockage due to the growth of particles may occur due to adhesion of the inner pores.
2 is a graph showing hardness and wear resistance.
Referring to FIG. 2, when the hardness is increased, the life is increased and the impact resistance is decreased. Therefore, it is effective to find the optimum point (P) of hardness and life under each operating condition. That is, it is very important to determine the P point for each material and place of use.
Accordingly, in the present invention, the material of the pipe which may be a straight pipe or a curved pipe for conveying at a pneumatic pressure such as household waste is referred to as "KARCAS", which is a new word meaning the name of the material produced by the composition ratio according to the present invention. (Hereinafter referred to as carcass). As the required characteristics, it has to have a long life abrasion resistance and a shock resistance over a certain life. In other words, when partially broken by an impact, the load is accumulated. And chemical stability. That is, the corrosion of the inside of the pipe due to the corrosion of household waste should be prevented. In addition, weldability should be excellent. In other words, the entire system should be easy to construct.
To describe this in more detail, the impact resistance, that is, when transferring pressure such as high hardness, the impact resistance should be improved. That is, in the related art, clogging and smooth transfer are difficult because the curved pipe part is broken by an impact. For the long life over 10 years, the following review was made. Cr-W-Ti-carbide (Carbide) is used as a base material, and a carbide-reinforced phase element, that is, M3C, M7C3, etc., is added to improve the hardness. In addition, to improve the chemical stability of corrosion resistance due to moisture and acidified wastes, Mo, Ni, C content optimization to control corrosion resistance, grain boundary nodularity and grain size. Casting method controls the addition of spheroidizing agent, injection temperature and cooling temperature, which can be maintained in the solid phase of the main material to control the bed structure. Heat treatment minimizes thermal stress variation. In addition, in order to maintain excellent wear resistance against non-combustible materials, that is, wear resistance in the form of concrete particles in which the structure of the reinforcing phase in the matrix is spherical is very excellent. (Refer to Fig. 9-b)
Finally, it improves the economical and constructability by improving the optimum material and shape and weldability. To this end, the shape of the curved part is reinforced according to the shape of the centrifugal force, and the weldable material is designed to have resistance to earth pressure received at the facility below 5m underground. As such, carcass, which is a material for waste transportation according to the present invention, has an optimal combination of physical properties to improve impact resistance, wear resistance and corrosion resistance.
Waste transport material according to the present invention having the above-described characteristics, C is 1.0 to 3.5wt%, Si is 2.0wt% or less, Mn is 2.0wt% or less, Cr is 14.0 to 26.0wt%, Mo is 3.0wt% or less Ni is 3.0 wt% or less, and a mixture of Ti, V, W, and Co is 5.0 wt% or less, and the balance is produced including Fe.
In the following, the component ratio of the carcass and the conventional products of the present invention having the above-described composition ratio are compared and the physical and chemical properties accordingly described.
division C Si Mn Cr Mo Ni Other (Ti, V, W, Co) Hardness Comparative Example 1 0.2 ~ 0.3 ≤2.0 1.3 0.9-1.0 60 ± 10 Comparative Example 2 3.0 ~ 5.0 ≤2.0 ≤2.0 18-30 ≤2.0 ≤2.5 ≤3.0 70 ± 10 Comparative Example 3 40 ~ 50 SiO ₂ + 9 ~ 10 Al ₂ O ₃ + 8 ~ 15 CaO + (K ₂ O + Na ₂ O etc.) Example 1 1.0-2.0 ≤2.0 ≤2.0 14-20 ≤1.0 ≤1.0 ≤3.0 70 ± 10 Example 2 2.0-3.5 ≤2.0 ≤2.0 20-26 ≤3.0 ≤3.0 ≤5.0 80 ± 10
Comparative Example 1 according to the above table represents a boron (B) -based rolling wear-resistant material (AR400, Hardox, etc.), which is a weldable material. Comparative Example 2 is a hardfacing (hardfacing) of about 2.0 wear resistance compared to the boron-based rolling wear-resistant material. Comparative Example 3 is a ceramic (basalt-based basalt) is possible to improve the life compared to the boron-based rolling material, but the build-up due to dust (dust) due to the impact can be predicted the result of clogging the hole.
However, Example 1 according to the present embodiment is a carcass 400w (KARCAS 400w, a new word meaning the name of the material manufactured according to Example 1 of the present invention), and wear resistance of about 2.5 to 3 times that of the boron-based rolled material. Strong enough and weldable. In addition, Example 2 is a carcass 500w (KARCAS 500w: is a new word meaning the name of the material produced according to Example 2 of the present invention) is about 3.5 times the wear resistance compared to the boron-based rolling material, flange fastening is possible Excellent workability
That is, carcass 400w according to Example 1 of the present invention is 1.0 to 2.0wt% C, 0.1 to 2.0wt% Si, 0.1 to 2.0wt% Mn, 14.0 to 20.0wt% Cr, 0.1 to Mo 1.0 wt%, Ni is 0.1 to 1.0 wt%, 0.1 to 3.0 wt% of the mixture in which Ti, V, W and Co are mixed, and the balance includes Fe. In the case of Carcass 400w of Example 1 thus prepared, the hardness (HS) is 70 ± 20. And, it can be welded and flange fastened. It is also possible to use the curved pipe and the T-shaped pipe.
Carcass 500w (KARCAS 500w) according to Example 2 of the present invention is 2.0 to 3.5wt% C, 0.1 to 2.0wt% Si, 0.1 to 2.0wt% Mn, 20.0 to 26.0wt% Cr, Mo 0.1 to 3.0 wt%, 0.1 to 3.0 wt% of Ni, 0.1 to 5.0 wt% of a mixture of Ti, V, W, and Co, and the balance includes Fe. The hardness of the carcass 500w of Example 2 thus prepared is 80 ± 20. It is connected using flange fastening.
3 is a photograph showing appearance of the pipe according to the present embodiment. More specifically, the photograph (a) is a pipe for bending pipe to be joined by welding using a carcass 400w, the photograph (b) is a wing-shaped photograph for distributing the load of the straight pipe portion, the photograph (c) is for high life This is a picture of a straight pipe that can be tightened with a flange developed with a carcass 500w.
As shown in FIG. 3, the carcass 400w according to Example 1 has an excellent surface state as compared to the conventional flat liner, and thus, the sliding property of the raw material is relatively excellent. In addition, the waste conveying pipe according to the present embodiment is very good because the hardness of the bent portion is 70 or more as HS in consideration of the operation time on the basis of household waste. Here, a, b and c in Fig. 3 are actual examples of various phenomena.
Compressed air in the curved part of the waste conveying pipe is conveyed at 25 m / sec (= 90 km / hr per hour). Therefore, the impact of the non-combustible metal or the like is generated on the household waste. Therefore, under the same conditions, a test specimen in the form of a plate according to each material was manufactured, and then impacted five times with a hammer as shown in the drawing.
4, 5 and 6 are photographs of the impact characteristic by the hammer. At this time, Figure 4 is a shock test picture of the material according to Comparative Example 2, Figure 5 is a shock test picture of the material according to Example 1. At this time, the (a) picture is the picture before the impact, (b) the picture is a picture after the impact five times with a hammer (Hammer). As shown in the photograph of FIG. 4, it can be seen that when the conventional Comparative Example 1 that is, the hard facing is subjected to five impacts, the microcracks of the impact portion are generated in a checkerboard shape (b). In FIG. 6, cracks were generated in the case of (a) basalt basalt ceramic in one impact as well. However, in the case of the carcass 400w according to the first embodiment of the present invention of FIG. 5, it can be seen that there is no change in the surface as shown in the photograph of (b) even after five impacts as in the photograph of (a). Thus, it can be seen that the material for the waste conveying pipe according to the embodiment of the present invention has excellent impact resistance.
7 is a photograph after testing the wear resistance characteristics of each material.
In the above experiment, abrasion test was performed by spraying the steel ball at a pressure of 9Kg / cm 2 for 5 minutes at the same time in order to create a condition similar to the curved portion of the waste transport pipe.
7 (a) and 7 (d) show that the microcracking and bending occurred on the surface of Comparative Example 1, that is, the test result of the hard facing material. In FIG. 7C, in the case of basalt basalt ceramic, pores are generated due to particle impact or the like. On the other hand, Figure 7 (b) of the material according to the present invention shows that the crack does not occur on the surface as a result of the carcass 400w according to Example 1 shows that it is excellent in resistance to the inflow of non-combustible material at high speed Can be.
8 and 9 are photographs observing the microstructure of the characteristics of the material after the impact with the force of F1 to observe the crack generation according to the microstructure. (A) A photograph is a photograph of the surface after an impact, (b) A photograph is an enlarged photograph of a part of the surface.
Referring to the photograph of FIG. 8, in the case of the hard facing of Comparative Example 1, fine cracks were also generated in the appearance thereof, and even in the enlarged photograph, linear cracks were generated according to the shape of the needle boundary. On the other hand, referring to the photograph of FIG. 9, in the case of the carcass 400w of the first embodiment of the present invention, there is almost no crack in its appearance, and the enlarged photograph shows that the cracks are rounded according to the spherical grain boundary.
As in the above-described experiment, the pipes made of the materials of the conventional Comparative Examples 1 to 3 easily cause cracking or abrasion due to an impact, etc., and build up in the area is caused by such cracking or abrasion. The problem is that the waste is stacked in the area, clogging the curvature, the air pressure leaks through the cracked area was difficult to transport the waste. However, in the case of the first and second embodiments, since the crack or wear due to the impact is not easily generated, the curved pipe part may be clogged or the air pressure may leak, thereby preventing the transport of garbage.
In addition, the waste conveying pipe produced through the material according to the present embodiment has excellent abrasion resistance with a critical hardness of HS 70 or more, excellent impact resistance with a critical strength of 30J or more, and excellent weldability and excellent workability.
Therefore, the present invention can be applied to an automatic waste disposal system for automatically transporting and treating waste by using the waste transport pipe described above.
According to the present embodiment, an automatic waste disposal system includes a waste inlet for receiving waste, a pipe for transporting waste, a collecting plant having a suction device for transporting and collecting the waste through the pipe, and incineration of collected waste It includes incinerator to do.
At this time, the pipe is 1.0 to 3.5wt% C, 2.0wt% or less Si, 2.0wt% or less Mn, 14.0 to 26.0wt% Cr, 3.0wt% or less Mo, 3.0wt% or less, Ti Use the pipe of this embodiment containing less than 5.0 wt% of the mixture of V, W and Co mixed with Fe.
Through this, the life of the waste disposal system can be extended, and the pipe life can be prevented from being corroded by the garbage transported by air pressure inside the pipe, and the life of the pipe can be prevented from being shortened by the wear of the pipe. Can be extended. In addition, by using the pipe with improved impact resistance, it is possible to reduce the occurrence of defects in the waste disposal system by preventing the crack of the pipe caused by the collision of rubbish at the bent portion and the T-shaped connection of the pipe.
At this time, a separate valve is formed between the inlet and the pipe to prevent a pressure change in the pipe, and to drive the system when the waste is injected.

As described above, the present invention utilizes the action force and the reaction force to the material for manufacturing the pipe for transporting waste, induces physical and chemical stability by adding Mo, Ni, etc., and wear-resistant Cr-W-Ti-carbide, Corrosion resistance can be improved by optimizing C content, thereby improving impact resistance, abrasion resistance and corrosion resistance.
Although the invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the invention is not limited thereto, but is defined by the claims that follow. Accordingly, one of ordinary skill in the art may variously modify and modify the present invention without departing from the spirit of the following claims.

Claims (8)

Waste conveying pipe, C 1.0 to 3.5 wt%, Si 2.0 wt% or less, Mn 2.0 wt% or less, Cr 14.0 to 26.0 wt%, Mo 0.1 to 3.0 wt%, Ni 0.1 to 3.0 wt%, Ti, V, A waste conveying pipe comprising a mixture of W and Co of 5.0 wt% or less and the balance of Fe or Fe. The method according to claim 1, The composition is 1.0 to 2.0wt% C, 0.1 to 2.0wt% Si, 0.1 to 2.0wt% Mn, 14.0 to 20.0wt% Cr, 0.1 to 1.0wt% Mo, 0.1 to 1.0wt% Ni , Ti, V, W, and Co is a mixture of 5.0wt% or less, the remainder is Fe, and the composition such as Cr ₇ C ₃ or carbides such as TiC, WC, VC to form a (HS) Waste conveying pipes, characterized in that 70 ± 10. The method according to claim 2, The waste conveying pipe may be manufactured in a straight form, a curved form or a T-shape, and the waste conveying pipe may be welded or flanged. The method according to claim 3, In the case of a pipe applicable using the flange, the pipe is 2.0 to 3.5 wt%, Si is 0.1 to 2.0 wt%, Mn is 0.1 to 2.0 wt%, Cr is 20.0 to 26.0 wt%, Mo is 0.1 to 3.0 wt%, Ni is 0.1 to 3.0wt%, the mixture of Ti, V, W and Co is 5.0wt% or less, the balance contains Fe, Cr ₇ C ₃ or TiC, WC, VC, etc. A waste conveying pipe, wherein carbide is formed so that the base material (HS) is 80 ± 20. delete The method according to claim 4, The waste conveying pipe may be manufactured in a straight form, a curved form or a T-shape, and the waste conveying pipe may be fastened to a flange. In the composition for waste conveying pipes, C 1.0 to 3.5 wt%, Si 2.0 wt% or less, Mn 2.0 wt% or less, Cr 14.0 to 26.0 wt%, Mo 0.1 to 3.0 wt%, Ni 0.1 to 3.0 wt%, Ti, V , W and Co is a mixture of 5.0wt% or less, the balance is Fe or Fe composition for waste conveying pipes. In the waste processing system which transports waste automatically, Inlet for receiving waste; A pipe for carrying the injected waste; A collecting plant having a suction device for collecting and collecting the waste through the pipe; An incinerator for incinerating the collected waste, The pipe is 1.0 to 3.5wt% C, 2.0wt% or less Si, 2.0wt% or less Mn, 14.0 to 26.0wt% Cr, 0.1 to 3.0wt% Mo, 0.1 to 3.0wt% Ni, Ti , V, W and Co is a mixture of less than 5.0wt%, the remaining amount of the waste treatment system comprising a Fe or Fe-based.

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