Novel fly ash collecting device of waste incineration waste heat boiler

Abstract

The utility model provides a novel fly ash collecting device of a waste incineration waste heat boiler, and belongs to the field of waste incineration power generation. The problems that in an existing fly ash collecting device, a horizontal spiral ash conveying machine is complex in cooling structure, high in failure rate and high in maintenance cost, and air leakage of a boiler is prone to causing adverse effects on performance are solved. The device comprises a water-cooling ash hopper and a plurality of heat insulation ash hoppers, the water-cooling ash hopper is arranged below the turning position of a second flue and a third flue of a boiler furnace, the inlet end of the water-cooling ash hopper is connected with the turning position of the second flue and the third flue of the boiler furnace, and the heat insulation ash hoppers are arranged below the water-cooling ash hopper side by side. The inlet end of the heat insulation ash hopper is connected with the outlet end of the water-cooled ash hopper, the outlet end of the water-cooled ash hopper is connected with an articulated chute, the inlet end of the articulated chute is connected with the outlet end of the water-cooled ash hopper, and the outlet end of the articulated chute is connected with a boiler rear arch. The fly ash collector is mainly used for collecting fly ash of boilers.

Description

Technical Field

[0001] This utility model belongs to the field of waste incineration power generation, and in particular relates to a novel fly ash collection device for waste incineration waste heat boilers. Background Technology

[0002] The flue gas from the waste incineration waste heat boiler carries a large amount of fly ash, which is rich in alkaline oxides such as K and Ca. Fly ash has a low melting point, small particle size, and strong adhesion, making it easy to adhere to the water-cooled walls and superheaters in the high flue gas temperature zone. This causes a decrease in the heat exchange capacity of the heating surfaces. At the same time, the high fly ash concentration can also cause wear on the heating surfaces and accelerate the corrosion of the tube bundles. Therefore, in the structural design of the waste incinerator, a diversion inertial fly ash separation and collection device is installed in the flue to reduce the fly ash content in the flue gas.

[0003] The furnace of a waste incineration waste heat boiler typically adopts a three-flue layout, with the first and third flues facing upwards and the second flue facing downwards. Therefore, fly ash in the flue gas at the turning point of the second and third flues will be separated due to inertia. As a result, ash hoppers need to be installed below the second and third flues to collect the fallen ash, and a horizontal screw conveyor is installed below the ash hoppers to transfer the fallen ash to a slag remover below the incinerator. The amount of fallen ash is controlled by the speed of the horizontal screw conveyor. However, the temperature of the fly ash separated from the second and third flues can reach over 700℃, resulting in a complex cooling structure for the horizontal screw conveyor, a high failure rate, high maintenance costs, and an easy risk of adverse effects on boiler performance due to air leakage. Utility Model Content

[0004] In view of this, the present invention aims to propose a new fly ash collection device for waste incineration waste heat boilers, in order to solve the problems of complex cooling structure, high failure rate, high maintenance cost, and easy adverse effects on boiler performance caused by air leakage in existing fly ash collection devices.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a novel fly ash collection device for a waste incineration waste heat boiler, comprising a water-cooled ash hopper and several insulated ash hoppers. The water-cooled ash hopper is located below the junction of the second and third flues in the boiler furnace. The inlet end of the water-cooled ash hopper is connected to the junction of the second and third flues in the boiler furnace. The several insulated ash hoppers are arranged side by side below the water-cooled ash hopper. The inlet end of the insulated ash hopper is connected to the outlet end of the water-cooled ash hopper. A chute is connected to the outlet end of the water-cooled ash hopper. The inlet end of the chute is connected to the outlet end of the water-cooled ash hopper. The outlet end of the chute is connected to the rear arch of the boiler.

[0006] Furthermore, the chute is equipped with an ash discharge valve.

[0007] Furthermore, a lower header is provided between the water-cooled ash hopper and several insulated ash hoppers. The inlet end of the lower header is connected to the outlet end of the water-cooled ash hopper, and the outlet end of the lower header is connected to the inlet end of the insulated ash hopper.

[0008] Furthermore, the insulated ash hopper is an inverted cone, and the angle between the cone surface of the insulated ash hopper and the horizontal plane is 60°.

[0009] Furthermore, a slag discharge pipe is provided at the bottom of the rear arch of the boiler, and the slag discharge pipe is located below the chute.

[0010] Furthermore, a slag remover is installed at the bottom of the slag discharge pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model provides a novel fly ash collection device for waste incineration waste heat boilers, which adopts a structure combining water-cooled ash hopper and insulated ash hopper. During the fly ash collection process, the water-cooled ash hopper effectively reduces the temperature of the fly ash to prevent high-temperature fly ash from damaging subsequent processing equipment. The insulated ash hopper prevents dust and slag from agglomerating in the ash hopper due to excessive temperature drop, thus affecting normal discharge and treatment. It also prevents the heat of the dust from being transferred outward, thereby reducing the temperature of surrounding equipment and working environment and protecting the safety of surrounding electrical equipment, instruments and operators.

[0013] 2. This utility model provides a novel fly ash collection device for waste incineration waste heat boilers. It is equipped with a chute, and the cooled ash falls directly to the ash removal machine below the boiler through the chute. There is no need to set up a horizontal screw conveyor, which eliminates potential failure hazards. The collection device has a simple structure, high reliability and good ash cooling effect.

[0014] 3. This utility model provides a novel fly ash collection device for waste incineration waste heat boilers. By setting a baffle ash discharge valve on the chute, the device can control the amount of ash falling, thus eliminating the need to control the amount of ash falling through a horizontal screw conveyor. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of a novel fly ash collection device for a waste incineration waste heat boiler according to the present invention;

[0017] Figure 2This is a top view schematic diagram of the arrangement of the insulated ash hopper in a novel fly ash collection device for a waste incineration waste heat boiler according to the present invention.

[0018] 1-Water-cooled ash hopper, 2-Insulated ash hopper, 3-Ash discharge valve, 4-Clubbing pipe, 5-Boiler rear arch, 6-Slag discharge pipe, 7-Slag removal machine, 8-Second flue, 9-Third flue. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0020] See Figure 1-2 This embodiment describes a novel fly ash collection device for a waste incineration waste heat boiler. It includes a water-cooled ash hopper 1 and several insulated ash hoppers 2. The water-cooled ash hopper 1 is located below the bend between the second flue 8 and the third flue 9 in the boiler furnace. The inlet end of the water-cooled ash hopper 1 is connected to the bend between the second flue 8 and the third flue 9 in the boiler furnace. The several insulated ash hoppers 2 are arranged side-by-side below the water-cooled ash hopper 1. The inlet end of each insulated ash hopper 2 is connected to the outlet end of the water-cooled ash hopper 1. The outlet end of the water-cooled ash hopper 1 is connected to a chute 4, and the inlet end of the chute 4 is connected to the outlet end of the water-cooled ash hopper 1. The outlet end of the chute 4 is connected to the rear arch 5 of the boiler. In this embodiment, a structure combining water-cooled ash hopper 1 and insulated ash hopper 3 is adopted. During the fly ash collection process, water-cooled ash hopper 1 effectively reduces the temperature of fly ash to prevent high-temperature fly ash from damaging subsequent processing equipment. The setting of insulated ash hopper 2 prevents dust and slag from agglomerating in the ash hopper due to excessive temperature drop, affecting normal discharge and treatment. It can also prevent the heat of dust and slag from being transferred outward, which can reduce the temperature of surrounding equipment and working environment, and protect the safety of surrounding electrical equipment, instruments and operators.

[0021] In this embodiment, a chute 4 is provided. The cooled dust falls directly to the ash and slag treatment mechanism below the boiler through the chute 4, eliminating the need for a horizontal screw conveyor and eliminating potential malfunctions. The collection device has a simple structure, high reliability, and good ash cooling effect.

[0022] In this embodiment, the chute 4 is equipped with an ash discharge valve 3. The ash discharge valve 3 on the chute 4 controls the amount of ash falling by controlling its opening, thus eliminating the need to control the amount of ash falling by a horizontal screw conveyor.

[0023] In this embodiment, the ash discharge valve 3 is a baffle ash discharge valve, and the type of ash discharge valve 3 can be adjusted according to actual needs.

[0024] In this embodiment, the water-cooled ash hopper 1 is formed by bending a water-cooled wall. The width of the water-cooled ash hopper 1 is the same as that of the boiler and is part of the boiler's water-cooled wall. The water-cooled ash hopper 1 can effectively cool the fly ash, reduce the temperature of the fly ash entering the lower insulated ash hopper 2, and increase the boiler's heating area.

[0025] The number of adiabatic ash hoppers 2 described in this embodiment can be adjusted practically according to the boiler's furnace width.

[0026] In this embodiment, the inner wall of the insulated ash hopper 2 is provided with refractory and heat-insulating materials to prevent the outer side of the insulated ash hopper 2 from overheating.

[0027] In this embodiment, a lower header is provided between the water-cooled ash hopper 1 and several insulated ash hoppers 2. The inlet end of the lower header is connected to the outlet end of the water-cooled ash hopper 1, and the outlet end of the lower header is connected to the inlet end of the insulated ash hopper 2. The lower header evenly distributes the ash and slag at the outlet end of the water-cooled ash hopper 1 into each insulated ash hopper 2.

[0028] In this embodiment, the insulated ash hopper 2 is an inverted cone. The angle between the cone surface of the insulated ash hopper 2 and the horizontal plane is 60°. In this embodiment, the angle between the cone surface of the insulated ash hopper 2 and the horizontal plane can also be adjusted according to actual needs to meet the ash discharge requirements.

[0029] In this embodiment, a slag discharge pipe 6 is provided at the bottom of the rear arch 5 of the boiler. The slag discharge pipe 6 is located below the chute 4. A slag remover 7 is provided at the bottom of the slag discharge pipe 6. The slag remover 7 is used for slag discharge and cleaning of the boiler. The slag remover can continuously remove ash and slag from the boiler to ensure that the space inside the boiler is not affected by the accumulation of ash and slag, thereby ensuring the stable operation of the boiler.

[0030] The embodiments of the present invention disclosed above are merely illustrative of the present invention. The embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A novel fly ash collection device for waste incineration waste heat boilers, characterized in that: It includes a water-cooled ash hopper (1) and several insulated ash hoppers (2). The water-cooled ash hopper (1) is located below the turning point of the second flue (8) and the third flue (9) in the boiler furnace. The inlet end of the water-cooled ash hopper (1) is connected to the turning point of the second flue (8) and the third flue (9) in the boiler furnace. Several insulated ash hoppers (2) are arranged side by side below the water-cooled ash hopper (1). The inlet end of the insulated ash hopper (2) is connected to the outlet end of the water-cooled ash hopper (1). The outlet end of the water-cooled ash hopper (1) is connected to a chute (4). The inlet end of the chute (4) is connected to the outlet end of the water-cooled ash hopper (1). The outlet end of the chute (4) is connected to the rear arch (5) of the boiler.

2. The novel fly ash collection device for a waste incineration waste heat boiler according to claim 1, characterized in that: The chute (4) is equipped with an ash discharge valve (3).

3. The novel fly ash collection device for a waste incineration waste heat boiler according to claim 1, characterized in that: A lower header is provided between the water-cooled ash hopper (1) and several insulated ash hoppers (2). The inlet end of the lower header is connected to the outlet end of the water-cooled ash hopper (1), and the outlet end of the lower header is connected to the inlet end of the insulated ash hopper (2).

4. A novel fly ash collection device for a waste incineration waste heat boiler according to claim 1, characterized in that: The insulated ash hopper (2) is an inverted cone, and the angle between the cone surface of the insulated ash hopper (2) and the horizontal plane is 60°.

5. A novel fly ash collection device for a waste incineration waste heat boiler according to claim 1, characterized in that: A slag discharge pipe (6) is provided at the bottom of the rear arch (5) of the boiler, and the slag discharge pipe (6) is located below the chute (4).

6. A novel fly ash collection device for a waste incineration waste heat boiler according to claim 5, characterized in that: A slag remover (7) is installed at the bottom of the slag discharge pipe (6).

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