A refuse incineration fly ash homogenization device and method

Abstract

The present invention discloses a refuse incineration fly ash homogenization device and method. The device includes an ash tank and more than one conveying mechanism. The top of the ash tank has a feeding port, and the bottom of the ash tank has a discharging port. The bottom of the conveying mechanism is communicated with the lower part of the ash tank, and the top of the conveying mechanism is communicated with the top of the ash tank. More than one of the conveying mechanisms are all used for conveying the fly ash at the lower part of the ash tank to the top of the ash tank, and the conveying speeds of the fly ash by more than one of the conveying mechanisms are different. The method is realized by using the above-mentioned device. Based on the problem of great difficulty in fly ash solidification treatment caused by uneven properties of fly ash in the ash tank, the device and method of the present invention can achieve the homogenization treatment of fly ash in the ash tank.

Description

Technical Field

[0001] The present invention relates to the technical field of waste incineration equipment, and in particular to a waste incineration fly ash homogenization device and method. Background Art

[0002] Waste incineration plants incinerate a large amount of domestic waste, with daily ash output reaching tens or even hundreds of tons. Among them, the fly ash from the waste heat boiler superheater, the bottom of the economizer, the bottom of the bag filter and the bottom of the reaction tower in the waste incineration equipment is respectively collected into the public scraper through the scrapers at various parts, and then lifted to the ash bin by the bucket elevator. Due to the flue gas treatment process, a large amount of lime needs to be sprayed into the reaction tower to remove the acid gas, resulting in a large difference in the properties of the fly ash at the bottom of the reaction tower and the bag filter and the fly ash at the bottom of the front-end waste heat boiler, which in turn leads to a large difference in the fly ash at different sections in the ash bin. However, due to the inherent ash conveying method, the fly ash from different parts and different periods cannot be fully mixed, but directly enters the ash bin for accumulation, which makes the fly ash at different height sections in the ash bin have different properties.

[0003] Usually, fly ash is solidified, that is, fly ash, cement, chelating agent and water are mixed evenly and solidified, and the solidified body is landfilled. The treatment process of the solidification workshop is to discharge the ash from the bottom of the ash bin and use a unified chelation process in sequence. The proportion of reagents in the chelation process is fixed. However, the properties of fly ash from different parts, different time periods and different properties vary greatly, resulting in mismatched reagent ratios. The chelated fly ash may have the risk of partially failing to meet the standards, which increases the difficulty of the fly ash chelation treatment process and the cost of fly ash treatment materials. Summary of the invention

[0004] The purpose of the present invention is to provide a garbage incineration fly ash homogenization device and method, which can fully homogenize the fly ash in the ash tank and reduce the difficulty of the subsequent treatment process of the fly ash.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A garbage incineration fly ash homogenization device comprises an ash tank and one or more conveying mechanisms, wherein the top of the ash tank is provided with a material drop opening, and the bottom of the ash tank is provided with a material discharge opening;

[0007] The bottom of the conveying mechanism is connected to the lower part of the ash tank, and the top of the conveying mechanism is connected to the top of the ash tank;

[0008] The more than one conveying mechanism is used to convey the fly ash at the bottom of the ash tank to the top of the ash tank, and the more than one conveying mechanism has different conveying speeds for the fly ash.

[0009] Further, the lower part of the ash tank is a conical cylinder with a gradually decreasing cross-sectional area from top to bottom. The discharge port is located at the bottom end of the conical cylinder, and the conveying mechanism is connected to the side wall of the conical cylinder.

[0010] Further, a feed hopper is provided on the side wall of the conical cylinder, and the feed hopper is communicated with the conveying mechanism;

[0011] The ash tank is vertically placed, the feed hopper is obliquely downward, and the acute angle between the central axis of the feed hopper and the horizontal plane is ≥60°.

[0012] Further, the number of the conveying mechanisms is two, and four feed hoppers are evenly distributed on the side of the conical cylinder. Two adjacent feed hoppers correspond to one conveying mechanism;

[0013] The four feed hoppers are respectively communicated with the conveying mechanism through pipelines, and feed star valves are provided on the pipelines where the four feed hoppers are communicated with the conveying mechanism.

[0014] Further, a discharge hopper is provided at the top of the ash tank, and the discharge hopper is communicated with the conveying mechanism;

[0015] The ash tank is vertically placed, the discharge hopper is obliquely downward, and the acute angle between the central axis of the discharge hopper and the horizontal plane is ≥60°.

[0016] Further, one conveying mechanism corresponds to two discharge hoppers;

[0017] A discharge star valve is installed on the pipeline where the discharge hopper located upstream of the conveying in the two discharge hoppers is connected to the conveying mechanism.

[0018] Further, the conveying mechanism includes a conveying pipeline and a conveying power mechanism installed on the conveying pipeline;

[0019] The conveying pipeline is in a closed loop, and the conveying power mechanism is located at the top of the conveying pipeline.

[0020] A method for homogenizing fly ash from waste incineration, which uses the above-mentioned equipment for homogenizing fly ash from waste incineration, and the method includes the following steps:

[0021] One or more of the above-mentioned conveying mechanisms transport the fly ash at the lower part of the ash tank to the top of the ash tank;

[0022] Based on the conveying speed difference of one or more of the above-mentioned conveying mechanisms, the falling speeds of the fly ash at the same cross-section in the ash tank are different, so that the ash layers of the fly ash in the ash tank are staggered;

[0023] One or more of the above-mentioned conveying mechanisms circulate the fly ash in the ash tank 2 - 6 times.

[0024] Furthermore, a discharge hopper is provided on the top of the ash tank, and the discharge hopper is connected to the conveying mechanism; the ash tank is placed vertically, and the discharge hopper is arranged obliquely downward, and the acute angle between the central axis of the discharge hopper and the horizontal plane is ≥60°;

[0025] After the fly ash enters the ash tank from the discharge hopper, it falls to the other side of the ash tank relative to the discharge hopper.

[0026] Furthermore, one of the conveying mechanisms has two discharge hoppers correspondingly;

[0027] The discharge weight ratio of the two discharge hoppers corresponding to one conveying mechanism is 1:1.

[0028] The beneficial effects of the present invention are:

[0029] Based on the problem that fly ash solidification treatment is difficult due to uneven properties of fly ash in the ash tank, the present invention adds multiple conveying mechanisms to the ash tank to transport the fly ash at the bottom of the ash tank to the top. Through the different conveying speeds of the multiple conveying mechanisms, the fly ash corresponding to different conveying mechanisms in the ash tank falls at different speeds in the ash tank, so that the fly ash falling speeds of the same section are different, so that the ash layers of the fly ash in the ash tank are staggered, and the fly ash in the tank can be mixed and homogenized.

[0030] By limiting the installation angle of the discharge hopper, not only can smooth material discharge be ensured, but the degree of fly ash homogenization can also be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a garbage incineration fly ash homogenization device according to an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 A view of the device in the direction of A;

[0033] Figure 3 yes Figure 1 A schematic top view of the device shown;

[0034] Among them, there are an ash tank 1, a material drop port 11, a material discharge port 12, a cone 13, a feed hopper 14, a feed star valve 141, a discharge hopper 15, a discharge star valve 151, a conveying mechanism 2, a conveying pipeline 21, and a conveying power mechanism 22. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features, which are used to distinguish and describe features, without order or importance.

[0037] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] The following Figures 1 to 3 describes a fly ash homogenization device for a waste incineration fly ash according to an embodiment of the present invention.

[0040] The fly ash homogenization device for waste incineration fly ash includes an ash tank 1 and more than one conveying mechanism 2. The top of the ash tank 1 has a feeding port 11, and the bottom of the ash tank 1 has a discharging port 12; the bottom of the conveying mechanism 2 is communicated with the lower part of the ash tank 1, and the top of the conveying mechanism 2 is communicated with the top of the ash tank 1; more than one conveying mechanism 2 is used to convey the fly ash at the lower part of the ash tank 1 to the top of the ash tank 1, and the conveying speeds of the fly ash by more than one conveying mechanism 2 are different.

[0041] Based on the problem of difficult fly ash solidification treatment caused by the uneven properties of the fly ash in the ash tank 1, the present invention adds a plurality of conveying mechanisms 2 to the ash tank 1 for transporting the fly ash at the bottom of the ash tank to the top. Through the different conveying speeds of the plurality of conveying mechanisms 2, the falling speeds of the fly ash corresponding to different conveying mechanisms 2 in the ash tank 1 are different, so that the falling speeds of the fly ash in the same cross-section are different, the ash layers of the fly ash in the ash tank 1 are staggered, and the mixing of the fly ash in the tank can be realized, and the homogenization of the fly ash can be achieved.

[0042] In order to improve the smooth discharging of fly ash in the ash silo 1, further, the lower part of the ash silo 1 is a conical cylinder 13 with a gradually decreasing cross-sectional area from top to bottom. The discharge port 12 is located at the bottom end of the conical cylinder 13, and the conveying mechanism 2 is connected to the side wall of the conical cylinder 13. The fly ash in the ash silo 1 presses against the inner wall of the conical cylinder 13, and the fly ash in the silo can be concentrated and fall in the conical cylinder 13. When the conveying mechanism 2 is connected to the side wall of the conical cylinder 13 and is in communication with the ash silo 1, the fly ash can smoothly enter the conveying mechanism 2 and be transported back to the top of the ash silo.

[0043] In order to enable the fly ash in the ash silo 1 to smoothly fall into the conveying mechanism, further, a feed hopper 14 is provided on the side wall of the conical cylinder 13, and the feed hopper 14 is in communication with the conveying mechanism 2; the ash silo 1 is vertically placed, the feed hopper 14 is inclined downward, and the acute angle between the central axis of the feed hopper 14 and the horizontal plane is ≥60°. Based on the angle at which the fly ash enters the feed hopper 13 along the inclined inner wall of the conical cylinder 13, the fly ash in the silo can be concentrated in the conical cylinder 13 and smoothly enter the conveying mechanism 2 and be transported back to the top of the ash silo. When the acute angle between the central axis of the feed hopper 14 and the horizontal plane is ≥60°, this angle is greater than the angle of repose of the material, which can prevent the material from staying still in the feed hopper 14 and enable the fly ash to flow by gravity. Preferably, there is an anti-caking vibration system for the ash silo 1 near the feed hopper 14. If there are phenomena such as caking and bridging, they can be solved by vibration.

[0044] In order to improve the effect of fly ash homogenization, further, the number of conveying mechanisms 2 is two, and four feed hoppers 14 are evenly distributed on the side of the conical cylinder 13. Two adjacent feed hoppers 14 correspond to one conveying mechanism 2. Specifically, the bottom of the ash silo 1 can be divided into 4 90° fan-shaped areas in the cross-sectional direction, and each fan-shaped area is provided with a feed hopper 14. Two feed hoppers 14 enter one conveying mechanism 2 for mixing, that is, one conveying mechanism 2 is responsible for transporting the materials within a semi-circle. Based on the different conveying speeds of the two conveying mechanisms 2, the fly ash on both sides in the ash silo 1 is mixed.

[0045] The four feed hoppers 14 are respectively connected to the conveying mechanism 2 through pipelines, and a feed star valve 141 is provided on the pipelines connecting the four feed hoppers 14 to the conveying mechanism 2. The feed amount can be controlled through the feed star valve 141.

[0046] In order to ensure the smooth discharging and further improve the homogenization of fly ash, a discharge hopper 15 is provided at the top of the ash silo 1. The discharge hopper 15 is in communication with the conveying mechanism 2. The ash silo 1 is vertically placed, the discharge hopper 15 is inclined downward, and the acute angle between the central axis of the discharge hopper 15 and the horizontal plane is ≥60°. 60° is the angle of repose of the material. When the installation angle of the discharge hopper is less than this angle, the material may stay still naturally and will not flow by gravity. By limiting the installation angle of the discharge hopper 15, it is ensured that the fly ash can flow by gravity and the discharge hopper 15 is prevented from being blocked.

[0047] Further, one conveying mechanism 2 corresponds to two discharge hoppers 15; a discharge rotary valve 151 is installed on the pipeline connecting the discharge hopper 15 located upstream of the two discharge hoppers 15 in the conveying direction and the conveying mechanism 2. Based on two conveying mechanisms 2, the discharge ratio of the two discharge hoppers of the same conveying mechanism 2 should be 1:1. The second discharge hopper in the direction of material flow is not provided with a discharge rotary valve, and all the materials that are not discharged from the first discharge hopper will be discharged from the second discharge hopper. At different conveying speeds of the conveying mechanism 2, only by adjusting the discharge speed of the discharge rotary valve on the first discharge hopper can the discharge amounts of the two discharge hoppers 15 of the same conveying mechanism 2 be ensured to be equal, so as to ensure that the discharge amounts in two adjacent 90° sectors are equal.

[0048] In order to ensure that the fly ash discharged from one conveying mechanism 2 can fall to the other side of the ash tank 1, the connection between the discharge hopper 15 and the top of the ash tank 1 is close to the center line of the ash tank 1.

[0049] The conveying mechanism 2 of the present invention is a screw conveyor, a bucket elevator or a tube chain conveyor. Preferably, the conveying mechanism 2 is a tube chain conveyor, including a conveying pipeline 21 and a conveying power mechanism 22 installed on the conveying pipeline 21; the conveying pipeline 21 is in a closed loop, and the conveying power mechanism 22 is located on the side of the conveying pipeline 21.

[0050] Correspondingly, an embodiment of the present invention provides a method for homogenizing municipal solid waste incineration fly ash. This method uses the above-mentioned equipment for homogenizing municipal solid waste incineration fly ash. Based on two conveying mechanisms, this method includes the following steps:

[0051] The two conveying mechanisms 2 transport the fly ash at the lower part of the ash tank 1 to the top of the ash tank 1;

[0052] Based on the conveying speed difference between the two conveying mechanisms 2, the falling speeds of the fly ash at the same cross-section in the ash tank 1 are different, so that the ash layers of the fly ash in the ash tank 1 are staggered;

[0053] The two conveying mechanisms 2 circulate the fly ash in the ash tank 1 for 2 - 6 times.

[0054] Based on the acute angle between the central axis of the discharge hopper 15 and the horizontal plane ≥ 60°, when the fly ash enters the ash tank 1 from the discharge hopper 15, it falls to the other side of the ash tank 1 relative to the discharge hopper 15. The discharge weight ratio of the two discharge hoppers 15 corresponding to one conveying mechanism 2 is 1:1.

[0055] Other components and operations of the equipment and method for homogenizing municipal solid waste incineration fly ash according to the embodiments of the present invention are known to those of ordinary skill in the art, and will not be described in detail here.

[0056] In the description of this specification, the descriptions referring to terms such as "embodiment", "example", etc. mean that the specific features, structures, materials or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0057] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for homogenizing municipal solid waste incineration fly ash, characterized in that, This method uses a waste incineration fly ash homogenization device, which includes an ash tank and multiple conveying mechanisms. The top of the ash tank has a feeding port, and the bottom of the ash tank has a discharging port; the bottom of the conveying mechanism is connected to the lower part of the ash tank, and the top of the conveying mechanism is connected to the top of the ash tank; Multiple conveying mechanisms are all used to convey the fly ash at the lower part of the ash tank to the top of the ash tank, and the conveying speeds of the fly ash by the multiple conveying mechanisms are different; A discharging hopper is provided at the top of the ash tank, and each conveying mechanism is correspondingly connected to two discharging hoppers; a discharging star valve is installed on the pipeline connecting the discharging hopper located upstream of the two discharging hoppers corresponding to the same conveying mechanism; The ash tank is vertically placed, the discharging hopper is obliquely downward, and the acute angle between the central axis of the discharging hopper and the horizontal plane is ≥60°; The waste incineration fly ash homogenization method includes the following steps: Multiple conveying mechanisms transport the fly ash at the lower part of the ash tank to the top of the ash tank; Based on the conveying speed differences of the multiple conveying mechanisms, the falling speeds of the fly ash corresponding to different conveying mechanisms in the ash tank are different, so that the falling speeds of the fly ash at the same cross-section in the ash tank are different, and the ash layers of the fly ash in the ash tank are staggered; Multiple conveying mechanisms circulate the fly ash in the ash tank 2 - 6 times.

2. The method for homogenizing municipal solid waste incineration fly ash according to claim 1, wherein The lower part of the ash tank is a conical cylinder with a gradually decreasing cross-sectional area from top to bottom, the discharging port is located at the bottom end of the conical cylinder, and the conveying mechanism is connected to the side wall of the conical cylinder.

3. The method for homogenizing waste incineration fly ash according to claim 2, wherein, A feeding hopper is provided on the side wall of the conical cylinder, and the feeding hopper is connected to the conveying mechanism; The ash tank is vertically placed, the feeding hopper is obliquely downward, and the acute angle between the central axis of the feeding hopper and the horizontal plane is ≥60°.

4. The method for homogenizing waste incineration fly ash according to claim 3, wherein The number of the conveying mechanisms is two, and four feeding hoppers are evenly distributed on the side of the conical cylinder. Two adjacent feeding hoppers correspond to one conveying mechanism, and the other two feeding hoppers correspond to the other conveying mechanism; The four feeding hoppers are respectively connected to the corresponding conveying mechanisms through pipelines, and feeding star valves are provided on the pipelines connecting the four feeding hoppers to the conveying mechanisms.

5. The method for homogenizing waste incineration fly ash according to claim 4, wherein The conveying mechanism includes a conveying pipeline and a conveying power mechanism installed on the conveying pipeline; The conveying pipeline is in a closed loop, and the conveying power mechanism is located at the top of the conveying pipeline.

6. The method for homogenizing waste incineration fly ash according to claim 1, characterized in that, When the fly ash enters the ash tank from the discharging hopper, it falls to the other side of the ash tank relative to the discharging hopper.

7. The method for homogenizing waste incineration fly ash according to claim 1, characterized in that, The discharging weight ratio of the two discharging hoppers corresponding to the same conveying mechanism is 1:1.

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