Ash deposition prevention horizontal cooling flue for high-temperature and high-dust-content flue gas
By installing heat exchange tubes and ash hopper structures in the horizontal flue, the problem of dust deposition in high-temperature, high-dust flue gas was solved, enabling smooth flow of flue gas and heat recovery, thereby improving production efficiency and energy saving.
Patent Information
- Application Number
- CN202520554564.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-27
AI Technical Summary
When high-temperature, dust-laden flue gas flows in a horizontal flue, dust easily accumulates, causing blockage and affecting production processes.
Design a horizontal cooling flue to prevent ash accumulation. It adopts a heat exchange tube and ash hopper structure. The heat exchange tube is arranged axially along the inner wall of the flue. The inner wall is covered with heat exchange film. A hollow wall is formed below the opening. Dust falls into the ash hopper and is discharged through the ash collection pipe. At the same time, heat is recovered by using the heat exchange tube.
It effectively avoids soot deposition, enables horizontal flow of high-temperature flue gas and heat recovery, improves the anti-explosion capability of the flue, and enhances production efficiency and energy saving.
Smart Images
Figure CN223954179U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to flue technology field, especially relate to a horizontal cooling flue of high temperature high dust containing flue gas of anti-ash deposit. BACKGROUND
[0002] High temperature high dust containing flue gas refers to the mixed gas of temperature significantly higher than normal temperature (usually up to hundreds to thousands of degrees Celsius) and carrying a large amount of solid particulate matter in industrial production. This kind of flue gas is mainly produced in metallurgical processes such as coking, ironmaking, steelmaking, etc. Its high temperature characteristic is due to the heat released by fuel combustion, metal smelting and chemical reaction, and high dust content is closely related to factors such as raw material crushing, high temperature volatilization, mechanical agitation, etc. For example, in the coking process, coking coal dry distillation in the coke oven above 1000℃ will release flue gas containing tar and benzopyrene; the high temperature reduction reaction (1200-1500℃) of iron ore and coke in the blast furnace produces high-temperature blast furnace gas containing iron oxide dust and CO; during converter steelmaking, oxygen blowing of molten iron for decarburization (above 1600℃) causes metal evaporation and oxidation, forming fine particulate flue dust mainly composed of iron oxide. In addition, incomplete combustion of fuel (such as sintering machine coal) and mechanical friction during material transportation (such as ore crushing) also aggravate the generation of flue dust. This kind of flue gas has complex composition, usually containing particulate matter such as iron oxide, silicon dioxide and heavy metals, as well as harmful gases such as CO, SO2 and NOx, and the treatment needs to consider high-temperature waste heat recovery and multi-stage dust removal and desulfurization technology.
[0003] For example, converter flue gas is a mixed gas produced during the blowing process of converter steelmaking, composed of CO (main component), CO2 and trace high-temperature gas and flue dust, with flue dust content of 150g / Nm 3 , and flue gas volume and composition change dramatically with the steelmaking stage: CO accounts for 85%-90% during the middle stage of blowing, at which time the flue gas volume is the largest, and the flue gas volume significantly decreases at the initial stage / late stage, and returns to zero at the end of blowing. In the prior art, the converter flue is usually designed in the form of a waste heat boiler, which utilizes the heat of high-temperature flue gas to generate steam, achieving energy recovery, and at the same time reducing the flue gas temperature through radiation heat transfer. After the high-temperature flue gas is preliminarily cooled by the vaporization flue, it enters the cyclone dust removal, wet scrubbing and other links to finally complete the deep separation of dust and harmful components.
[0004] However, when high-temperature high-dust-containing flue gas flows through the horizontal flue, the dust in the flue gas will deposit at the bottom of the flue due to gravity, causing the deposition of flue dust, blocking the flue gas passage, affecting the flow of flue gas, and further affecting the process production. UTILITY MODEL CONTENT
[0005] The utility model discloses a horizontal cooling flue of high temperature high dust containing flue gas of anti-ash deposit, which can be applied to the horizontal flow of various high-temperature high-dust-containing flue gas, effectively avoids the deposition of flue dust, and is high-efficiency and energy-saving.
[0006] Technical solution: To achieve the above-mentioned utility model purposes, the utility model adopts the following technical solutions:
[0007] A horizontal cooling flue for high-temperature high-dust-containing flue gas, comprising a flue arranged horizontally, heat exchange pipes and ash hoppers, the flue bottom is provided with an opening, the opening is connected with an ash hopper below, the heat exchange pipes are arranged inside the flue and are arranged axially along the inner wall of the flue; the outer wall of the heat exchange pipes above the high point of the opening periphery line is connected with heat exchange membranes on both sides, covering the inner wall of the flue; the heat exchange pipes below the high point of the opening periphery line are light pipes, forming a hollow wall below the flue opening.
[0008] As a specific embodiment, the heat exchange membranes are arranged symmetrically along 180° of the outer surface of the heat exchange pipes, the end faces of the adjacent heat exchange membranes on the adjacent heat exchange pipes are in contact or have a small gap, covering the inner wall of the flue.
[0009] As a specific embodiment, the flue is provided with a steam drum outside, the heat exchange pipes are serpentine pipes, and the two ends of the serpentine pipes are connected with the steam drum.
[0010] As a further scheme, a forced circulation pump is arranged on the pipeline connecting the water inlet of the heat exchange pipe with the steam drum.
[0011] As a specific embodiment, the opening arranged at the flue bottom is one or more, and one ash hopper is connected below each opening or one ash hopper is connected below multiple openings.
[0012] As a further scheme, a dust collecting pipe is arranged below the ash hoppers, the openings below each ash hopper are connected with the dust collecting pipe, and the dust collecting pipe is provided with a dust outlet at one end, and the end portion is inclined downward.
[0013] Further, the dust collecting pipe is a cylindrical structure.
[0014] As a specific embodiment, the flue is a cylindrical structure, and the ash hopper is a conical structure with a small opening downward.
[0015] Beneficial effects: In the horizontal flue of the utility model, the heat exchange pipes below the high point of the opening periphery line are light pipes, forming a hollow wall, which not only makes the dust fall into the ash hopper, but also forms the function of the grate; the outer surfaces of the remaining heat exchange pipes are all connected with heat exchange membranes, and the heat exchange pipes and the membranes cover the inner surface of the flue, protecting the inner wall of the flue. The flue and the ash hopper are both arranged as circular or approximately circular channels, having a certain anti-explosion capacity. Compared with the prior art, the horizontal cooling flue of the utility model can be applied to the horizontal flow of various high-temperature high-dust-containing flue gas, has the function of heat recovery for high-temperature flue gas, effectively avoids the deposition of smoke dust, and is high-efficiency and energy-saving. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a structure schematic view of the horizontal cooling flue (elevation structure section view and system overall schematic view) of the utility model.
[0017] Figure 2 It is a structure schematic view of the horizontal cooling flue (section view) of the utility model.
[0018] Figure 3 It is a structure schematic view of the horizontal cooling flue (top view section view) of the utility model. DETAILED DESCRIPTION
[0019] The utility model will be further described below in combination with the drawings.
[0020] In the description of the utility model, it needs to be understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the position relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the patent.
[0021] Example 1
[0022] A horizontal cooling flue for high-temperature high-dust flue gas to prevent dust accumulation, as shown in Figure 1 and Figure 2 includes a flue 1 arranged horizontally, a heat exchange pipe 2 and a hopper 3, and the flue 1 is externally provided with a steam drum 4. A spiral heat exchange coil can be arranged on the inner surface of the tapered wall of the hopper 3 as an economizer to cool the wall surface of the hopper 3.
[0023] The flue 1 is provided with an opening 101 at the bottom, and the opening 101 is connected with the hopper 3 below. In this embodiment, the opening 101 is provided with a plurality of openings, and each opening 101 is connected with a hopper 3 below; it should be noted that the opening 101 arranged at the bottom of the flue 1 is one or more, and each opening 101 is connected with a hopper 3 below, or a plurality of openings 101 are connected with a hopper 3, which can also achieve the purpose of the utility model; specifically, if there is no possibility of flue gas combustion and explosion, the opening 101 arranged at the bottom of the flue 1 is multiple, and a hopper 3 with an elliptical cross-sectional shape or a square cross-sectional shape is connected to the bottom of the multiple openings 101; only for flue gas with the possibility of combustion and explosion, because the circular cross-sectional passage has a certain anti-combustion and explosion capacity, the opening 101 arranged at the bottom of the flue 1 is multiple, and a hopper 3 with a circular cross-sectional passage is connected to the bottom of each circular opening 101.
[0024] The ash hopper 3 is provided with an ash collecting pipe 5, the lower opening of each ash hopper 3 is connected with the ash collecting pipe 5, one end of the ash collecting pipe 5 is provided with an ash outlet 501, and the end is inclined downward. The shape of the opening 101 can be square, circular or any shape, and the ash hopper 3 must cover the size of the opening, and the purpose of the utility model can be achieved.
[0025] The heat exchange pipe 2 is arranged inside the flue 1 and is arranged axially along the inner wall of the flue 1, the outer wall of the heat exchange pipe 2 located above the high point of the hole peripheral line of the opening 101 is connected with the heat exchange film piece 201 on both sides, the heat exchange film piece 201 is arranged symmetrically along the 180° direction of the outer surface of the heat exchange pipe, the end faces of the adjacent heat exchange film pieces 201 on the adjacent heat exchange pipes 2 are in contact or have a small gap, and the inner wall of the flue 1 is covered.
[0026] The heat exchange pipe 2 is a serpentine pipe, and the two ends are respectively connected with the steam drum 4. A forced circulation pump 401 is arranged on the pipeline connected with the steam drum 4.
[0027] In the embodiment, the flue 1 is a cylindrical structure, the ash hopper 3 is a conical structure, the small opening faces downward, and the ash collecting pipe 5 is a cylindrical structure. If a large amount of combustible CO gas is contained in high-temperature (about 630 DEG C or below) flue gas, if O2 is doped and reaches a certain mixing ratio with CO, and if large-particle sparks exist in the dust, combustion and explosion are easy to occur, therefore, the flue and the ash hopper are all arranged as a circular cross-section channel, and have a certain anti-explosion capacity.
[0028] The working process and principle of the horizontal flue of the utility model are as follows:
[0029] The heat exchange pipe 2 located below the high point of the hole peripheral line of the opening 101 is a light pipe, and forms a hollow flue wall, which not only enables the dust to fall into the ash hopper, but also has the function of the grate. The outer surfaces of the remaining heat exchange pipes 2 are all connected with the heat exchange film pieces 201, and the heat exchange pipes 2 and the film pieces 201 cover the inner surface of the flue 1 and protect the inner wall. When high-temperature and high-dust flue gas (such as converter flue gas) flows in the horizontal flue 1, the hollow surface formed by the heat exchange pipes 2 enters the ash hopper 3 below and is finally discharged through the ash outlet 501 of the ash collecting pipe 5. Water is supplied to the heat exchange pipes 2 through the steam drum 4 to generate steam, so that the high-temperature converter flue gas is cooled. A spiral heat exchange coil can be arranged in the conical wall of the ash hopper 3 as a economizer to cool the ash hopper wall.
[0030] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A horizontal cooling flue for high temperature, high dust laden flue gas, which is protected against dust deposition, characterized in that, The application relates to a heat exchange device for a boiler, which comprises a flue (1) arranged horizontally, heat exchange pipes (2) and ash hoppers (3), wherein the bottom of the flue (1) is provided with an opening (101), the opening (101) is connected with the ash hoppers (3) below, the heat exchange pipes (2) are arranged inside the flue (1) and axially arranged along the inner wall of the flue (1); the outer wall of the heat exchange pipes (2) above the high point of the hole peripheral line of the opening (101) is connected with heat exchange film pieces (201) on both sides, so as to cover the inner wall of the flue (1); the heat exchange pipes (2) below the high point of the hole peripheral line of the opening (101) are light pipes, and a hollow wall is formed below the opening (101) of the flue (1).
2. The dust accumulation preventing horizontal cooling flue for high temperature and high dust containing flue gas according to claim 1, characterized in that, The heat exchange film pieces (201) are symmetrically arranged along the 180-degree direction of the outer surface of the heat exchange pipes (2), the end faces of the adjacent heat exchange film pieces (201) on the adjacent heat exchange pipes (2) are in contact or have a small gap, and the inner wall of the flue (1) is covered.
3. The dust accumulation preventing horizontal cooling flue for high temperature and high dust containing flue gas according to claim 1, characterized in that, The flue (1) is externally provided with a steam drum (4), the heat exchange pipes (2) are serpentine pipes, and the two ends of the serpentine pipes are respectively connected with the steam drum (4).
4. The dusting prevention horizontal cooling flue of high temperature and high dust containing flue gas according to claim 3, characterized in that, A forced circulation pump (401) is arranged on the pipeline, wherein the inlet of the heat exchange pipe (2) is connected with the steam drum (4).
5. The dust accumulation preventing horizontal cooling flue for high temperature and high dust containing flue gas according to claim 1, characterized in that, The opening (101) arranged at the bottom of the flue (1) is one or more, one ash hopper (3) is connected below each opening (101), or one ash hopper (3) is connected below the multiple openings (101).
6. The dust accumulation preventing horizontal cooling flue for high temperature and high dust containing flue gas according to claim 5, characterized in that, The lower portion of the ash hopper (3) is provided with a dust collecting pipe (5), the lower openings of the ash hoppers (3) are all connected with the dust collecting pipe (5), one end of the dust collecting pipe (5) is provided with a dust outlet (501), and the end portion is inclined downward.
7. The dust accumulation preventing horizontal cooling flue for high temperature and high dust containing flue gas according to claim 6, characterized in that, The dust collecting pipe (5) is a cylindrical structure.
8. The dust accumulation preventing horizontal cooling flue for high temperature and high dust containing flue gas according to claim 1, characterized in that, The flue (1) is a cylindrical structure; and the ash hopper (3) is a conical structure with a small opening downward.