Cooling turning plate for hearth of heat-conducting oil boiler

Abstract

The utility model provides a hearth cooling turning plate of a heat conduction oil boiler, which relates to the technical field of boiler cooling turning plates and comprises a coil pipe assembly, the coil pipe assembly comprises an inner coil pipe, a middle coil pipe and an outer coil pipe which are concentrically arranged in sequence from inside to outside, and the inlet end and the outlet end of the inner coil pipe are respectively provided with an inner coil pipe connecting pipe. The inner ring coil pipe connecting pipe at the inlet end is connected with the upper cooling turning plate device, the inner ring coil pipe connecting pipe at the outlet end is connected with the lower cooling turning plate device, and the lower cooling turning plate device and the upper cooling turning plate device are the same in structure. The lower cooling turning plate device and the upper cooling turning plate device are made of heat-resistant steel, are matched with heat-conducting oil for forced cooling, replace refractory materials to achieve active heat exchange, counteract deformation stress at the high temperature of 1700 DEG C, abandon refractory cement which is prone to falling off, directly participate in heat exchange through metal flow channels, and are not prone to falling off. The problem that refractory cement is adopted for heat insulation of a hearth of a conventional boiler product, the boiler starting and stopping time is long along with operation of the boiler, and consequently the refractory cement falls off is solved.

Description

Technical Field

[0001] This utility model mainly relates to the field of boiler cooling flap technology, specifically to a furnace cooling flap for a thermal oil boiler. Background Technology

[0002] In industrial production, thermal oil boilers are widely used as important thermal energy equipment in various fields such as chemical, textile, and food processing. Traditional thermal oil boiler furnace structures primarily use refractory cement as insulation material, a design with serious technical flaws:

[0003] Refractory cement detachment problem: During long-term boiler operation, frequent start-ups and shutdowns cause drastic temperature changes inside the furnace. Due to thermal expansion and contraction, the refractory cement cracks and gradually detaches. The detached refractory cement not only reduces the furnace's insulation performance, leading to significant heat loss, but may also block the flow channels of heat transfer oil, affecting the normal operation of the boiler and even causing safety accidents.

[0004] Limited insulation effect: When the flue gas temperature inside the furnace is too high, the insulation capacity of traditional refractory cement is insufficient and cannot effectively block heat transfer, causing the temperature of the outer wall of the furnace to rise. This not only wastes energy but also poses a threat to the safety of surrounding equipment and operators.

[0005] Maintenance difficulties: Once the refractory cement is damaged, the repair process is complicated and time-consuming, requiring large-scale disassembly and recasting of the entire furnace, resulting in long boiler downtime and affecting production efficiency.

[0006] Traditional thermal oil boilers typically have an insulation layer with a certain heat storage capacity. When the boiler suddenly loses power or stops heating, the heat stored in the insulation layer continues to heat the thermal oil. Since the thermal oil circulation system may have stopped operating at this time, the thermal oil cannot remove the heat in time, easily causing the oil temperature to rise sharply, exceeding its operating temperature limit and resulting in overheating and coking. Coking of the thermal oil forms carbon deposits on the inner walls of the pipes, reducing the heat transfer efficiency of the pipes, increasing energy consumption, and may also lead to pipe blockage, causing more serious safety problems.

[0007] With the continuous expansion of industrial production scale, the load and efficiency requirements for thermal oil boilers are also increasing. Under high-load operating conditions, the furnace structure of traditional boilers faces more severe challenges, such as rapid damage to refractory materials and a decline in thermal efficiency. However, existing technologies are insufficient to meet these growing demands, and a new furnace cooling technology is urgently needed to solve these problems. Utility Model Content

[0008] 1. The technical problem to be solved by the utility model:

[0009] This utility model provides a cooling flap for the furnace of a thermal oil boiler to solve the technical problems existing in the background art.

[0010] 2. Technical Solution:

[0011] To achieve the above objectives, the technical solution provided by this utility model is as follows: a furnace cooling flap for a thermal oil boiler, comprising a coil assembly. The coil assembly includes an inner coil, a middle coil, and an outer coil arranged concentrically from the inside to the outside. The inlet and outlet ends of the inner coil are each provided with an inner coil connector. The inner coil connector at the inlet end is connected to an upper cooling flap device, and the inner coil connector at the outlet end is connected to a lower cooling flap device. The input ends of the upper cooling flap device, the middle coil, and the outer coil are all connected to an inlet header via pipes. The outlet ends of the lower cooling flap device, the middle coil, and the outer coil are all connected to an outlet header via pipes. The lower cooling flap device has the same structure as the upper cooling flap device.

[0012] Preferably, the upper cooling flap device includes an upper cooling flap upper tube plate, an upper cooling flap lower tube plate, an upper cooling flap partition, and an upper cooling flap cylinder. The upper cooling flap upper tube plate and the upper cooling flap lower tube plate are arranged parallel to each other vertically. An upper cooling flap cylinder is connected between the upper cooling flap upper tube plate and the upper cooling flap lower tube plate. An upper cooling flap partition is provided inside the upper cooling flap cylinder. The upper cooling flap partition is spirally distributed to divide the internal space into multiple flow channels.

[0013] Preferably, the bottom surface of the lower tube plate of the upper cooling flap is provided with a second tube opening near the upper cooling flap cylinder, and the second tube opening is connected to one end of the inner coil. The top surface of the upper tube plate of the upper cooling flap is provided with a first tube opening near the center, and the first tube opening is connected to the inlet header.

[0014] Preferably, a through hole is provided at the center of the upper cooling flap plate and the lower cooling flap plate. The through hole is used to connect the burner, and the burner heats the coil assembly through the through hole.

[0015] 3. Beneficial effects:

[0016] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0017] The lower and upper cooling flap devices of this invention are made of heat-resistant steel and are used in conjunction with forced cooling by thermal oil. This replaces refractory materials to achieve "active heat exchange," offsetting the deformation stress at 1700℃. It eliminates the need for easily detached refractory cement and allows the metal flow channel to directly participate in heat exchange. This solves the problem of refractory cement falling off during long start-up and shutdown times in conventional boiler products, which use refractory cement for furnace insulation. It also solves the problem of excessively high flue gas temperature in current thermal oil boilers, which prevents the furnace insulation layer from effectively isolating the temperature and is difficult to disassemble and replace. Furthermore, the lower and upper cooling flap devices do not store heat and have no heating effect when the thermal oil boiler stops heating. This avoids the danger of the insulation layer in the furnace storing heat and continuing to heat the thermal oil during a sudden power outage, which could lead to overheating and coking of the thermal oil.

[0018] The lower cooling flap device and the upper cooling flap device of this utility model are welded together from heat-resistant steel. The lower cooling flap device and the upper cooling flap device form a flow channel for heat-conducting oil. The multiple flow channels in the lower cooling flap device and the upper cooling flap device increase the radiation heat-receiving area. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the upper cooling flap device of this utility model.

[0021] Figure label:

[0022] 1. Inlet header; 2. Inner coil connection; 3. Middle coil; 4. Outer coil; 5. Outlet header; 6. Upper cooling flap device; 7. Upper cooling flap upper tube sheet; 8. Upper cooling flap lower tube sheet; 9. Upper cooling flap partition; 10. Upper cooling flap cylinder; 11. Pipe port one; 12. Pipe port two; 13. Inner coil; 14. Lower cooling flap device. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] It should be noted that the structures not described in this utility model are not related to the design points and improvement directions of this utility model, and are the same as or can be implemented by existing technology, so they will not be elaborated here. Example

[0028] See attached document Figures 1-2A cooling flap for a thermal oil boiler furnace includes a coil assembly. The coil assembly comprises an inner coil 13, a middle coil 3, and an outer coil 4 arranged concentrically from the inside out, forming a multi-layered radiant heat exchange surface. The inner coil 13, middle coil 3, and outer coil 4 are not connected. The inlet and outlet ends of the inner coil 13 are each equipped with an inner coil connector 2. The inlet end of the inner coil connector 2 is connected to an upper cooling flap device 6, and the outlet end of the inner coil connector 2 is connected to a lower cooling flap device 14. The input ends of the upper cooling flap device 6, middle coil 3, and outer coil 4 are all connected to an inlet header 1 via pipes. The outlet ends of the lower cooling flap device 14, middle coil 3, and outer coil 4 are all connected to an outlet header 5 via pipes. The lower cooling flap device 14 has the same structure as the upper cooling flap device 6. The lower cooling flap device 14 and the upper cooling flap device 6 are made of special heat-resistant steel with a high temperature resistance of up to 1200℃, such as Cr25Ni20 alloy, and are welded together.

[0029] The upper cooling flap device 6 includes an upper cooling flap upper tube plate 7, an upper cooling flap lower tube plate 8, an upper cooling flap partition 9, and an upper cooling flap cylinder 10. The upper cooling flap upper tube plate 7 and the upper cooling flap lower tube plate 8 are arranged parallel to each other vertically. The upper cooling flap cylinder 10 is connected between the upper cooling flap upper tube plate 7 and the upper cooling flap lower tube plate 8. The upper cooling flap partition 9 is arranged inside the upper cooling flap cylinder 10. The upper cooling flap partition 9 is spirally distributed to divide the internal space into multiple flow channels.

[0030] The bottom surface of the lower tube plate 8 of the upper cooling flap is provided with a second tube opening 12 near the upper cooling flap cylinder 10. The second tube opening 12 is connected to one end of the inner ring coil 13. The top surface of the upper tube plate 7 of the upper cooling flap is provided with a first tube opening 11 near the center. The first tube opening 11 is connected to the inlet header 1.

[0031] Through holes are provided at the center of the upper cooling flap plate 7 and the lower cooling flap plate 8. These through holes are used to connect to the burner, which heats the coil assembly through the through holes. An explosion-proof hole for installing an explosion-proof door is provided in the center of the lower cooling flap device 14. The explosion-proof door of the lower cooling flap is linked to the furnace pressure sensor, with a response time of <0.5 seconds, effectively preventing furnace deflagration accidents.

[0032] The bottom of the upper cooling flap device 6 is located at the center of the middle coil 3, and the top of the lower cooling flap device 14 is located at the center of the inner coil 13, preventing flue gas from being discharged through the upper and lower gaps. The lower cooling flap device 14 and the upper cooling flap device 6 are embedded in the center of the inner coil 13, and with the help of welding, a labyrinth seal is formed, and the flue gas leakage rate is much better than that of traditional refractory cement.

[0033] Working principle

[0034] The heat transfer oil is diverted from the inlet header 1 to three paths:

[0035] Main path: Enters the multi-circuit flow channel through the pipe port 11 of the upper cooling flap device 6, and after heat exchange in the multi-circuit flow channel, flows into the inner coil 13 from the pipe port 12.

[0036] Branch circuit: Directly enters the middle coil 3 and the outer coil 4 to form a parallel heat exchange channel.

[0037] Heat exchange stage: When the heat transfer oil flows in the three-layer coil, it absorbs the heat radiated by the burner through the central through hole, and at the same time, the high-temperature flue gas outside the cooling flap exchanges heat with the heat transfer oil in the flow channel through the cylinder wall.

[0038] Outlet Stage: The heat transfer oil from the inner coil 13 outlet undergoes another heat exchange via the lower cooling flap device 14, then merges with the heat transfer oil from the middle and outer coils and is discharged through the outlet header 5, completing the heat exchange cycle. By combining the symmetrical upper cooling flap device 6 and lower cooling flap device 14 with the three-layer coil, a composite heat exchange system of "radiative heat exchange + convective heat exchange" is constructed, breaking through the efficiency bottleneck of traditional single-stage heat exchange. Through the innovative application of cooling flap technology, a technological leap from "passive insulation" to "active heat exchange" is achieved, solving the inherent defects of refractory materials and improving heat utilization efficiency through metal flow channel design, providing a revolutionary solution for high-temperature industrial heating equipment.

[0039] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A heat transfer oil boiler furnace cooling flap, characterized in that: The device includes a coil assembly comprising an inner coil (13), a middle coil (3), and an outer coil (4) arranged concentrically from the inside to the outside. The inner coil (13) is provided with an inner coil connector (2) at both its inlet and outlet ends. The inner coil connector (2) at the inlet end is connected to the upper cooling flap device (6), and the inner coil connector (2) at the outlet end is connected to the lower cooling flap device (14). The input ends of the upper cooling flap device (6), the middle coil (3), and the outer coil (4) are all connected to the inlet header (1) via pipes. The outlet ends of the lower cooling flap device (14), the middle coil (3), and the outer coil (4) are all connected to the outlet header (5) via pipes. The lower cooling flap device (14) has the same structure as the upper cooling flap device (6).

2. A heat transfer oil boiler furnace cooling flap according to claim 1, characterized in that: The upper cooling flap device (6) includes an upper cooling flap upper tube plate (7), an upper cooling flap lower tube plate (8), an upper cooling flap partition (9), and an upper cooling flap cylinder (10). The upper cooling flap upper tube plate (7) and the upper cooling flap lower tube plate (8) are arranged parallel to each other. The upper cooling flap cylinder (10) is connected between the upper cooling flap upper tube plate (7) and the upper cooling flap lower tube plate (8). The upper cooling flap partition (9) is provided inside the upper cooling flap cylinder (10). The upper cooling flap partition (9) is spirally distributed to divide the internal space into multiple flow channels.

3. A heat transfer oil boiler furnace cooling flap according to claim 2, characterized in that: The bottom surface of the lower tube plate (8) of the upper cooling flap is provided with a second tube opening (12) near the upper cooling flap cylinder (10). The second tube opening (12) is connected to one end of the inner ring coil (13). The top surface of the upper tube plate (7) of the upper cooling flap is provided with a first tube opening (11) near the center. The first tube opening (11) is connected to the inlet header (1).

4. A heat transfer oil boiler furnace cooling flap according to claim 3, characterized in that: A through hole is provided at the center of the upper cooling flip plate (7) and the lower cooling flip plate (8). The through hole is used to connect the burner, and the burner heats the coil assembly through the through hole.

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