Integral furnace top for hot blast stove

Abstract

The utility model discloses an integral furnace top for a hot blast stove, which comprises an integral furnace top with a hollow cavity, the integral furnace top is formed by hermetically welding an arc-shaped inner arch plate, an arc-shaped outer arch plate, two end plates and two bottom plates, and a cold air inlet and a hot air outlet are respectively arranged at two ends of the outer arch plate in the length direction. The cold air inlet and the hot air outlet are connected with a cold air connecting pipe and a hot air connecting pipe respectively, a plurality of radial baffle plates are arranged in the hollow cavity between the cold air inlet and the hot air outlet in the length direction of the arc-shaped inner arch plate, and therefore a multi-stage turn-back heat exchange flow channel with one end communicated with the cold air inlet and the other end communicated with the hot air outlet is formed in the hollow cavity. A strip-shaped heat exchange tube bundle is arranged along the ridge line of the arc-shaped inner arch plate and is composed of a plurality of heat exchange steel tubes welded to the ridge of the arc-shaped inner arch plate. The integral furnace top for the hot-blast stove is convenient to construct, short in construction period, good in sealing effect, low in maintenance cost, capable of producing hot air through heat exchange between the furnace top and air and high in energy utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of hot air furnace technology for producing hot air for grain drying towers, and in particular to an integral furnace roof of a hot air furnace. Background Technology

[0002] Hot blast stoves are crucial equipment in grain drying systems, used to heat outdoor air into hot air for injection into the grain drying tower. In existing technologies, the roof of such hot blast stoves is typically constructed of refractory bricks. Because the roof is usually arched, arched molds are required for support during construction. After construction, the molds must be removed, requiring skilled workers, resulting in slow construction speed and significant challenges in quality control. Furthermore, newly constructed roofs require a slow drying process of 7-15 days before normal operation, making construction time-consuming. Moreover, the joints between the refractory bricks in the roof are difficult to completely seal with refractory mortar, leading to high-temperature flue gas leakage, which can cause heat loss and even affect safe production, necessitating timely shutdown for maintenance. Additionally, refractory brick roofs lack heat exchange capabilities; during operation, the roof dissipates heat into the surrounding space, which cannot be fully collected and utilized. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an integral furnace roof for a hot blast stove. The integral furnace roof is easy to construct, has a short construction period, good sealing effect, low maintenance cost, and can produce hot air by exchanging heat with the air through the furnace roof, resulting in high energy utilization.

[0004] The technical solution adopted to solve the technical problem is as follows: An integral furnace roof for a hot blast stove, comprising an integral furnace roof with a hollow cavity, which is formed by sealing and welding an arc-shaped inner arch plate, an arc-shaped outer arch plate, two end plates and two bottom plates. Cold air inlets and hot air outlets are respectively provided at both ends of the outer arch plate along its length. Cold air pipes and hot air pipes are respectively connected to the cold air inlets and hot air outlets. Multiple radial baffles are provided in the hollow cavity between the cold air inlets and hot air outlets along the length of the arc-shaped inner arch plate, thereby forming a multi-stage deflecting heat exchange channel in the hollow cavity, with one end connected to the cold air inlet and the other end connected to the hot air outlet.

[0005] As a further embodiment of this utility model: a strip-shaped heat exchange tube bundle is provided along the ridge line of the arc-shaped inner arch plate. The heat exchange tube bundle is composed of multiple heat exchange steel pipes welded to the ridge of the arc-shaped inner arch plate. The width of the strip-shaped heat exchange tube bundle is smaller than the width of the overlapping area of ​​the radial baffle.

[0006] As a further embodiment of this utility model: the chord of the inner arc plate is parallel to the chord of the outer arc plate, the center of the inner arc plate is on the same straight line as the center of the outer arc plate, and the radius of the inner arc plate is greater than the radius of the outer arc plate.

[0007] As a further embodiment of this utility model: the upper end of the heat exchange steel pipe is located between the inner arc-shaped arch plate and the outer arc-shaped arch plate, and multiple through holes are opened on the pipe wall of the heat exchange steel pipe.

[0008] As a further aspect of this utility model: the maximum distance between the upper end of the heat exchange steel pipe and the bottom surface of the arc-shaped outer arch plate is less than the gap width between the outer walls of adjacent heat exchange steel pipes.

[0009] As a further aspect of this utility model: the gap width between the outer walls of adjacent heat exchange steel pipes is smaller than the diameter of the heat exchange steel pipes.

[0010] As a further embodiment of this utility model: the heat exchange tube bundle is composed of multiple rows of heat exchange steel tubes arranged in parallel at equal intervals along the length direction of the arc-shaped inner arch plate, with adjacent rows of heat exchange steel tubes arranged in an alternating manner.

[0011] As a further embodiment of this utility model: the center line or axis of the cold air pipe and the hot air pipe are parallel to the chord of the arc-shaped outer arch plate.

[0012] Beneficial Effects: This utility model of an integral furnace roof for a hot blast stove features a hollow cavity structure, consisting of an inner arc-shaped arched plate, an outer arc-shaped arched plate, two end plates, and two bottom plates sealed and welded together. Cold air inlets and hot air outlets are located at both ends of the outer arched plate along its length, respectively, with cold air pipes and hot air pipes connected to them. During construction, the integral furnace roof only needs to be hoisted and placed on the furnace wall, followed by sealing and insulation. This design offers advantages such as convenient construction, short construction period, no need for mold disassembly, and low skill requirements for construction personnel. Furthermore, as the furnace roof is an integral structure, long-term use will not cause flue gas leakage, resulting in low maintenance costs. This utility model's integral furnace roof utilizes the furnace roof as an auxiliary heat exchanger to heat air and produce hot air, resulting in a higher hot air output and higher energy recovery efficiency compared to ordinary hot blast stoves that only use flue gas heat exchangers. Attached Figure Description

[0013] The integral furnace roof of the hot blast stove of this utility model will be further described in detail below with reference to the accompanying drawings.

[0014] Figure 1 This is an overall structural diagram of the integrated furnace roof for the hot blast stove of this utility model;

[0015] Figure 2 This is an exploded structural diagram of the integral furnace top for the hot blast stove of this utility model;

[0016] Figure 3 This is a structural diagram of the heat exchange steel pipe in the integral furnace top of the hot blast stove of this utility model;

[0017] Figure 4This is a top view of the hollow cavity of the integral furnace top of the hot blast stove of this utility model. Detailed Implementation

[0018] like Figure 1 , Figure 2 As shown, the integral furnace top for the hot blast stove of this utility model includes an integral furnace top with a hollow cavity, which is formed by sealing and welding an arc-shaped inner arch plate 2, an arc-shaped outer arch plate 1, two end plates 4 and two bottom plates 3. Cold air inlets and hot air outlets are respectively provided at both ends of the outer arch plate along its length. Cold air pipes 7 and hot air pipes 8 are respectively connected to the cold air inlets and hot air outlets. Multiple radial baffles 5 are provided in the hollow cavity between the cold air inlets and hot air outlets along the length of the arc-shaped inner arch plate, thereby forming a multi-stage deflecting heat exchange channel in the hollow cavity, with one end connected to the cold air inlet and the other end connected to the hot air outlet. The inner arc-shaped arch plate, outer arc-shaped arch plate, end plate, bottom plate, and deflector plate are all made of steel plates with a thickness of 5mm or more. During the construction of the hot blast stove, aluminum silicate plates are laid on the load-bearing contact surface between the furnace wall and the integral furnace top of the hot blast stove, that is, between the bottom surface of the bottom plate and the top surface of the furnace wall. This not only seals the gap between the bottom surface of the bottom plate and the top surface of the furnace wall, but also prevents the integral furnace top of the hot blast stove from pushing and pulling the furnace wall when it expands and contracts with heat, thus preventing damage to the furnace wall. The upper surface of the outer arc-shaped arch plate needs to be covered with insulation cotton.

[0019] like Figure 2 , Figure 4 As shown, a strip-shaped heat exchange tube bundle 6 is provided along the ridge of the arc-shaped inner arch plate. The heat exchange tube bundle is composed of multiple heat exchange steel pipes 61 vertically welded to the ridge of the arc-shaped inner arch plate. The width b of the strip-shaped heat exchange tube bundle is smaller than the width B of the overlapping area of ​​the radial baffle. The heat exchange tube bundle can conduct heat from the arc-shaped inner arch plate to the hollow cavity to exchange heat with the air, and can effectively increase the heat exchange area, so that the cold air entering the hollow cavity is fully heated, thereby further improving the energy utilization effect. The technical feature that the width of the strip-shaped heat exchange tube bundle is smaller than the width of the overlapping area of ​​the radial baffle ensures that the air must pass through the heat exchange tube bundle when entering / exiting each stage of the reversing flow channel 9, and the heat exchange tube bundle will not affect the air flow in the connecting area of ​​the two adjacent stages of the reversing flow channel, so that the air is heated more evenly.

[0020] like Figure 1 , Figure 2 As shown, the chords of the inner and outer curved arches are parallel to each other, and the centers of the inner and outer curved arches are on the same straight line. The radius of the inner arch is larger than that of the outer arch. This design makes the height of the ridge region of the inner curved arch within the hollow cavity greater than the height of the sides, thus providing space for installing strip-shaped heat exchange tube bundles along the ridge of the inner curved arch within the hollow cavity. This minimizes the impact of the heat exchange tube bundles on the flow channel cross-sectional area of ​​the region containing the strip-shaped heat exchange tube bundles.

[0021] like Figure 3 As shown, the upper opening of the heat exchange steel pipe is located between the inner and outer arc-shaped arch plates, and multiple through holes 62 are opened on the pipe wall. That is, the lower end of the heat exchange steel pipe is welded to the upper surface of the inner arc-shaped arch plate, and a distance is maintained between the upper opening of the heat exchange steel pipe and the outer arc-shaped arch plate, allowing air to enter the interior of the heat exchange steel pipe through the through holes in the pipe wall and flow inside, being fully heated by the heat exchange steel pipe, resulting in better heat exchange performance.

[0022] Preferably, the maximum distance between the upper pipe opening of the heat exchange steel pipe and the bottom surface of the arc-shaped outer arch plate is less than the gap width between the outer walls of adjacent heat exchange steel pipes, so that the resistance at each point of the flow channel section is more uniform, and avoids a large amount of airflow from passing directly from the upper end of the heat exchange steel pipe without passing through the outer wall of the steel pipe, thus forming a deflection flow and reducing the heat exchange effect.

[0023] Preferably, the gap width between the outer walls of adjacent heat exchange steel pipes is smaller than the diameter of the heat exchange steel pipes, so that the airflow can be forced into the interior of the heat exchange steel pipes when passing through the heat exchange tube bundle, resulting in better heat exchange effect.

[0024] Preferably, the heat exchange tube bundle is composed of multiple rows of heat exchange steel tubes arranged in parallel at equal intervals along the length of the arc-shaped inner arch plate, with adjacent rows of heat exchange steel tubes arranged in an alternating pattern.

[0025] Preferably, the cold air inlet and hot air inlet can be made of square or circular cross-section pipes. When using square cross-section pipes, the centerlines of the cold air inlet and hot air inlet are parallel to the chord of the arc-shaped outer arch plate; when using circular cross-section pipes, the axes of the cold air inlet and hot air inlet are parallel to the chord of the arc-shaped outer arch plate. This horizontal air inlet and outlet structure allows the integral furnace roof of the hot blast stove of this invention to be easily matched with the flue gas heat exchanger of the hot blast stove.

[0026] Figure 4 The embodiment shown is an integral furnace roof for a hot blast stove with a 4-stage reflow channel. In actual production and use, the number of stages of the reflow channel and the positions of the cold air inlet and hot air outlet can be appropriately increased or decreased according to the size of the hot blast stove and the working space conditions.

[0027] This utility model's integral furnace roof for hot blast stoves can fully utilize the heat energy generated by combustion within the furnace. The output hot air merges with the hot air output from the flue gas heat exchanger and is then injected into the grain drying tower through hot air pipes. Furthermore, the inner furnace constructed using this utility model's integral furnace roof has a smoother surface on the top of the furnace chamber compared to ordinary refractory brick furnace roofs, making it less prone to coking. This is especially true for hot blast stoves using straw fuel, where the anti-coking performance of the furnace roof is more pronounced.

Claims

1. A monolithic top for a hot blast stove, comprising a monolithic top having a hollow chamber formed by a sealing welding of one arc-shaped inner dome plate, one arc-shaped outer dome plate, two end plates and two bottom plates, characterized in that: Cold air inlets and hot air outlets are provided at both ends of the outer arch plate along its length. Cold air pipes and hot air pipes are connected to the cold air inlets and hot air outlets respectively. Multiple radial baffles are provided in the hollow cavity between the cold air inlets and hot air outlets along the length of the arc-shaped inner arch plate, thereby forming a multi-stage zigzag heat exchange channel in the hollow cavity, with one end connected to the cold air inlet and the other end connected to the hot air outlet.

2. The monolithic top for a hot blast stove according to claim 1, characterized in that A strip-shaped heat exchange tube bundle is provided along the ridge of the arc-shaped inner arch plate. The heat exchange tube bundle is composed of multiple heat exchange steel pipes welded to the ridge of the arc-shaped inner arch plate. The width of the strip-shaped heat exchange tube bundle is smaller than the width of the overlapping area of ​​the radial baffle.

3. The monolithic top for a hot blast stove according to claim 2, characterized in that: The chords of the inner and outer arched plates are parallel to each other, the center of the inner and outer arched plates are on the same straight line, and the radius of the inner arched plate is greater than that of the outer arched plate.

4. The monolithic top for a hot blast stove according to claim 3, characterized in that: The upper end of the heat exchange steel pipe is located between the inner arc-shaped arch plate and the outer arc-shaped arch plate, and multiple through holes are opened on the pipe wall of the heat exchange steel pipe.

5. The monolithic top for a hot blast stove according to claim 4, characterized in that: The maximum distance between the upper end of the heat exchange steel pipe and the bottom surface of the arc-shaped outer arch plate is less than the gap width between the outer walls of adjacent heat exchange steel pipes.

6. The integral furnace roof for a hot blast stove according to claim 5, characterized in that: The gap width between the outer walls of adjacent heat exchange steel pipes is smaller than the diameter of the heat exchange steel pipes.

7. The monolithic top for a hot blast stove according to any one of claims 2 to 6, characterised in that: The heat exchange tube bundle is composed of multiple rows of heat exchange steel tubes arranged in parallel at equal intervals along the length of the arc-shaped inner arch plate, with adjacent rows of heat exchange steel tubes arranged in an alternating pattern.

8. The monolithic top for a hot blast stove according to claim 7, characterised in that: The centerline or axis of the cold air inlet and the hot air inlet are parallel to the chord of the curved outer arch plate.

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