Combined combustion apparatus based on annular cascade and vortex flow field

Abstract

The utility model discloses a combination combustion equipment based on annular ladder and vortex flow field, it includes: ladder cyclone cylinder, it is provided with fuel inlet and high temperature flue gas inlet, combustion flue gas outlet cylinder, it is sealedly installed at the top mouth place of ladder cyclone cylinder, and ash outlet cylinder is sealedly installed at the bottom mouth place of ladder cyclone cylinder, wherein, the cavity wall elevation of ladder cyclone cylinder upper cavity is enclosed into streamline closed cylinder, and the cavity wall of ladder cyclone cylinder lower cavity is that its section is along the circumferential track and extends into ring, and is enclosed into the conical cylinder annular ladder of gradually descending from big to small downwards. The utility model discloses device compares the conventional ladder furnace type of same ladder surface area, and the structure is more compact, and the material is more saving, and the surface area is smaller, and the heat loss is less, and high temperature flow field concentrates in the central area close to the top outlet simultaneously, and the thermal efficiency is higher.

Description

Technical Field

[0001] This utility model specifically relates to the field of fuel combustion equipment technology, and more specifically to a combined combustion equipment based on annular stepped flow field and vortex flow field. Background Technology

[0002] With the widespread application of alternative fuels, the technical routes in the cement industry can be roughly summarized into the application of several types of online terminal furnaces, such as step furnaces, hot plate furnaces, and rotary kilns. The general idea is to introduce hot flue gas into the furnace space to provide a pre-combustion site for alternative fuels, delay their residence time in the high-temperature flue gas, and maximize their combustion within the furnace. Each type of furnace is used and has its own characteristics in adapting to different fuels, but the equipment size and load are relatively large, and local high-temperature phenomena are common in the furnace. Utility Model Content

[0003] Therefore, this utility model proposes a combined combustion device based on annular steps and vortex flow field to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a combined combustion device based on annular stepped flow and vortex flow field, comprising:

[0005] A stepped cyclone separator is provided with a fuel inlet and a high-temperature flue gas inlet;

[0006] The combustion flue gas outlet cylinder is sealed at the top opening of the stepped cyclone cylinder;

[0007] And the ash outlet cylinder, which is sealed at the bottom opening of the stepped cyclone cylinder;

[0008] The upper cavity of the stepped cyclone tube forms a streamlined closed cylinder, and the lower cavity of the stepped cyclone tube has a cross-section that extends along a circumferential trajectory to form a ring, forming a conical annular step that is larger at the top and smaller at the bottom, and each step of the annular step is equipped with a nozzle 106.

[0009] Furthermore, preferably, the fuel inlet is located in the negative pressure zone on the side of the high-temperature flue gas inlet and at the upper part of the annular step, and the fuel inlet is connected to the fuel delivery and supply system.

[0010] Furthermore, as a preferred embodiment, the high-temperature flue gas inlet is connected to the upstream flue gas passage on the combustion system side.

[0011] Furthermore, as a preferred embodiment, the combustion flue gas outlet cylinder is connected to the downstream flue gas passage on the combustion system side.

[0012] Furthermore, as a preferred embodiment, the ash outlet cylinder is connected to the slag discharge channel on the combustion system side.

[0013] Furthermore, as a preferred embodiment, the stepped cyclone is lined with refractory material, and the refractory material used at the top of the stepped cyclone where the high-temperature flow field is concentrated and on the inner wall of the combustion flue gas outlet is locally thickened.

[0014] This utility model adopts the above technology and has the following beneficial effects compared with the existing technology: The stepped cyclone tube structure of this utility model has no relatively moving components, and the inlet and outlet are all connected by pipes, so there is no wear of sealing materials and less air leakage in the system; compared with the conventional stepped furnace with the same stepped surface area, the structure is more compact, uses less material, has a smaller surface area, and has less heat loss; at the same time, the high temperature flow field is concentrated in the central area near the top outlet, resulting in higher thermal efficiency; there are fewer jet power units and the jet coverage area is larger; the overall load is smaller, and each inlet and outlet and the cylinder can be rotated or mirrored to adapt to different system layouts, and the installation is more convenient and flexible. Attached Figure Description

[0015] Figure 1 A three-dimensional structural schematic diagram of a combined combustion device based on annular stepped flow field and vortex flow field;

[0016] Figure 2 This is a structural cross-sectional view of a combined combustion device based on annular steps and vortex flow field;

[0017] Figure 3 A schematic diagram illustrating the working principle of a combined combustion device based on annular stepped flow field and vortex flow field;

[0018] Figure 4 This is a schematic diagram of the nozzle arrangement in a combined combustion device based on annular stepped flow field and vortex flow field;

[0019] Figure 5 This is a plan view of the annular step structure in a combined combustion device based on annular steps and a vortex flow field.

[0020] Figure 6 A front perspective view of a combined combustion device based on annular steps and vortex flow field;

[0021] Figure 7 A three-dimensional perspective view of a combined combustion device based on annular stepped flow field and vortex flow field Figure 1 ;

[0022] Figure 8 A three-dimensional perspective view of a combined combustion device based on annular stepped flow field and vortex flow field Figure 2 .

[0023] In the diagram: 1. Stepped cyclone separator; 101. Combustion flue gas outlet; 102. Fuel inlet; 103. High-temperature flue gas inlet; 104. Annular step; 105. Ash outlet; 106. Nozzle. Detailed Implementation

[0024] With reference to the accompanying drawings of the embodiments of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below.

[0025] Example: Please refer to the appendix. Figure 1-8 This utility model provides a technical solution: a combined combustion device based on annular stepped flow field and vortex flow field, comprising:

[0026] The stepped cyclone 1 is provided with a fuel inlet 102 and a high-temperature flue gas inlet 103;

[0027] The combustion flue gas outlet cylinder 101 is sealed at the top opening of the stepped cyclone 1;

[0028] And the ash outlet cylinder 105, which is sealed at the bottom of the stepped cyclone 1;

[0029] The upper cavity wall of the stepped cyclone 1 forms a streamlined closed cylinder, and the lower cavity wall of the stepped cyclone 1 has its cross-section extending along a circumferential trajectory to form a ring, forming a conical annular step 104 that is larger at the top and smaller at the bottom and descends step by step. Each step surface of the annular step 104 is equipped with a nozzle 106.

[0030] In this embodiment, the fuel inlet 102 is located in the negative pressure zone on the side of the high-temperature flue gas inlet 103 and is located at the top of the annular step 104. The fuel inlet 102 is connected to the fuel delivery and supply system.

[0031] In this embodiment, the high-temperature flue gas inlet 103 is connected to the upstream flue gas passage on the combustion system side.

[0032] In this embodiment, the combustion flue gas outlet 101 is connected to the downstream flue gas passage on the combustion system side.

[0033] In this embodiment, the ash outlet cylinder 105 is connected to the slag discharge channel on the combustion system side;

[0034] Specifically, each inlet and outlet of the stepped cyclone 1 is connected to the combustion system using a high-temperature resistant expansion joint.

[0035] In this embodiment, the stepped cyclone 1 is lined with refractory material, and the refractory material used at the top of the stepped cyclone 1 where the high temperature flow field is concentrated and the inner wall of the combustion flue gas outlet cylinder 101 is locally thickened, and the local refractory material has excellent heat insulation performance.

[0036] It should also be noted that the nozzles are embedded in the refractory material paved with each level of the annular steps 104, with the center of the nozzles facing the axis of the stepped cyclone 1 cylinder and evenly distributed along the circumference of each level of step.

[0037] In practical implementation, when the stepped cyclone separator 1 is connected to the combustion system, the pressure difference between the combustion flue gas outlet and the high-temperature flue gas inlet 103 causes the introduced high-temperature flue gas to form a high-speed vortex flow field in the upper part of the separator (please refer to the appendix). Figure 3 Meanwhile, the high-temperature flue gas flows back along the inner wall of the upper cavity of the stepped cyclone 1 to the high-temperature flue gas inlet 103 area, further strengthening the high-speed vortex flow field and forming a high-speed jet vacuum zone at the inlet of the stepped cyclone 1. The fuel inlet 102 is located in this area.

[0038] The fuel drawn into the cylinder is spiraled down onto the annular step 104 under the action of centrifugal force and gravity. Its solid components are blown into the high-temperature flow field by the nozzle 106, where they are mixed and diffused in the flue gas and continue to burn. The unburned fuel is thrown against the inner wall of the cylinder and settles down under the action of centrifugal separation. During this process, the gas-solid two-phase flow is enhanced and fully mixed, the fuel is pyrolyzed and burned and finally burned out. The burned-out ash is discharged from the bottom ash outlet.

[0039] Meanwhile, the heat from fuel combustion is discharged through the combustion flue gas outlet and used by the combustion system.

[0040] It should be noted that this utility model device combines the characteristics of the currently mature conventional stepped combustion method and the cyclone structure, making full use of their respective advantages. The annular stepped design can provide a residence space for fuels with slower combustion rates in a high-temperature environment; the air injection stage can prevent fuel from overlapping and accumulating on the stepped surface; the high-speed vortex flow field creates a foundation for the complete combustion of combustibles and oxidizers, which is conducive to their dispersion, mixing and contact propagation, and can also provide the power conditions for gas-solid separation.

[0041] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A combined combustion device based on annular stepped flow and vortex flow field, characterized in that, It includes: A stepped cyclone separator (1) is provided with a fuel inlet (102) and a high-temperature flue gas inlet (103). Combustion flue gas outlet cylinder (101), which is sealed at the top opening of the stepped cyclone cylinder (1); And the ash outlet cylinder (105), which is sealed at the bottom opening of the stepped cyclone cylinder (1); The upper cavity wall of the stepped cyclone (1) forms a streamlined closed cylinder, and the lower cavity wall of the stepped cyclone (1) extends along the circumference to form a ring, forming a cone-shaped annular step (104) that is larger at the top and smaller at the bottom and descends step by step. Each step of the annular step (104) is equipped with a nozzle (106).

2. The combined combustion device based on annular stepped flow field and vortex flow field according to claim 1, characterized in that: The fuel inlet (102) is located in the negative pressure zone on the side of the high-temperature flue gas inlet (103) and is located at the top of the annular step (104). The fuel inlet (102) is connected to the fuel delivery and supply system.

3. The combined combustion device based on annular stepped flow field and vortex flow field according to claim 2, characterized in that: The high-temperature flue gas inlet (103) is connected to the upstream flue gas passage on the combustion system side.

4. The combined combustion device based on annular stepped flow field and vortex flow field according to claim 3, characterized in that: The combustion flue gas outlet cylinder (101) is connected to the downstream flue gas passage on the combustion system side.

5. The combined combustion device based on annular stepped flow field and vortex flow field according to claim 4, characterized in that: The ash outlet cylinder (105) is connected to the slag discharge channel on the combustion system side.

6. The combined combustion device based on annular stepped flow field and vortex flow field according to claim 1, characterized in that: The stepped cyclone (1) is lined with refractory material, and the refractory material used on the top of the stepped cyclone (1) where the high temperature flow field is concentrated and on the inner wall of the combustion flue gas outlet cylinder (101) is locally thickened.

Images