Fuel gas type heat conduction oil heating furnace

Abstract

The utility model is suitable for the technical field of heating equipment, and provides a fuel gas type heat-conducting oil heating furnace which comprises a heating furnace body, a heating cavity is arranged in the heating furnace body, a heat-conducting oil pipe group is arranged in the heating cavity, and fire is sprayed to the heat-conducting oil pipe group in the heating cavity through a burner for heating. The heat conduction oil pipe set comprises a liquid inlet pipeline, a plurality of spiral coil pipes and a liquid outlet pipeline which are communicated in sequence, the spiral coil pipes are sleeved inside and outside, a plurality of heat absorption fins are arranged on the outer side walls of the spiral coil pipes, the heating area of the whole pipeline is increased through the heat absorption fins, and the problem of local heating is avoided. Meanwhile, the heat of the tail gas is further recovered by utilizing the flue gas pipeline wound on the heat preservation and insulation layer, so that the energy loss is reduced.

Description

Technical Field

[0001] The utility model is applicable to the technical field of heating equipment and provides a gas-fired thermal oil heating furnace. Background Art

[0002] A thermal oil furnace is a special industrial furnace that uses thermal oil as a heat carrier and a circulating oil pump to force liquid circulation, transfers heat energy to heat-consuming equipment and then returns it for reheating. The heating forms of thermal oil furnaces usually include electric heating, gas heating, etc. Among them, gas heating usually ignites the combustible gas through a burner and sprays it into the heating chamber to heat the thermal oil pipeline in the heating chamber, thereby heating the thermal oil. However, this direct heating method of the pipeline causes the pipe wall directly facing the flame to be heated more, which results in uneven heating of the entire pipeline. At the same time, the open flame combustion method requires a smoke exhaust pipe to discharge exhaust gas to the outside, but this exhaust gas usually also has a high residual temperature. This part of the heat is directly discharged out of the furnace with the smoke, which also leads to energy waste. Utility Model Content

[0003] To this end, the utility model provides a gas-fired thermal oil heating furnace, which increases the heating area of ​​the entire pipeline by arranging heat-absorbing fins on the outer wall of the thermal oil pipeline, thereby avoiding the problem of local heating. At the same time, the flue gas pipeline wound around the thermal insulation layer is used to further recover the heat of the exhaust gas and reduce energy loss.

[0004] In order to achieve the above purpose, the utility model provides the following technical solution: a gas-fired thermal oil heating furnace, comprising:

[0005] A heating furnace body, wherein a heating chamber is arranged in the heating furnace body, and a heat insulation layer is arranged between the heating chamber and the outer wall of the heating furnace body;

[0006] A burner is arranged on one side of the heating furnace body and is connected to the heating chamber;

[0007] The heat transfer oil pipe group is arranged in the heating chamber, and the heat transfer oil pipe group includes a liquid inlet pipe, a plurality of spiral coils arranged inside and outside, and a liquid outlet pipe which are connected in sequence. The outer side wall of the spiral coil is provided with a plurality of heat absorbing fins.

[0008] Furthermore, it also includes several smoke ducts and smoke exhaust ports. The smoke ducts are arranged in the thermal insulation layer. One end of the smoke duct is arranged on the upper side of the heating chamber and is connected to the heating chamber, and the other end is connected to the smoke exhaust port.

[0009] Furthermore, the heat absorbing fins are arc-shaped annular metal sheets, and the heat absorbing fins are obliquely arranged on the outer side wall of the spiral coil.

[0010] Furthermore, the pipe opening of the liquid inlet pipe is arranged below the heating furnace body, and the pipe opening of the liquid outlet pipe is arranged above the heating furnace body.

[0011] Furthermore, the thermal insulation layer includes one or more of the following materials: polystyrene foam plastic, rigid polyurethane insulation board, foam glass, concrete, vitrified micro-bead insulation mortar, rock wool, and phenolic resin.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. In the utility model, heat absorbing fins are arranged on the outer side wall of the spiral coil in contact with the flame to increase the heating area of ​​the spiral coil, so that the area of ​​the spiral coil directly receiving the flame heating is increased, so that the heat transfer oil in the spiral coil is heated more fully and evenly;

[0014] 2. By lengthening the flue gas duct for exhaust gas and winding it inside the thermal insulation layer, the high-temperature exhaust gas in the heating chamber will take a longer time to be discharged. During this period, the high-temperature exhaust gas will be partially absorbed by the thermal insulation layer to maintain the temperature of the furnace body, thereby further reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the internal structure of a gas-fired thermal oil heating furnace mentioned in the utility model;

[0016] Figure 2 It is a schematic structural diagram of a portion of the spiral coil mentioned in the present invention being assembled with heat absorbing fins.

[0017] In the figure:

[0018] 1. Heating furnace body, 2. Heating chamber, 3. Heat transfer oil pipe group, 31. Spiral coil, 32. Heat absorbing fins, 33. Liquid outlet pipe, 34. Liquid inlet pipe, 4. Burner, 5. Flue gas pipe, 6. Smoke exhaust port, 7. Thermal insulation layer. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] For example, see the attached Figure 1The utility model provides a gas-fired thermal oil heating furnace, comprising a heating furnace body 1, a burner 4, a thermal oil pipe group 3, a plurality of flue gas pipes 5 and a smoke exhaust port 6; a heating chamber 2 is arranged in the heating furnace body 1, and a heat insulation layer 7 is arranged between the heating chamber 2 and the outer wall of the heating furnace body 1, and the heat insulation layer 7 comprises one or more of the following materials: polystyrene foam plastic, rigid foam polyurethane insulation board, foam glass, concrete, vitrified micro-bead insulation mortar, rock wool, phenolic resin, in a preferred embodiment, the heat insulation layer 7 is a concrete layer, a vitrified micro-bead insulation mortar layer, a rigid foam polyurethane insulation board, a foam glass layer and a rock wool layer from the outside to the inside, and the multi-layer composite heat insulation layer 7 can minimize the heat The burner 4 is arranged on one side of the heating furnace body 1 and is connected to the heating chamber 2. The burner 4 is a common ignition equipment. By connecting the gas source and the air source, the mixture of the two is sprayed into the heating chamber 2 and ignited, so that the heating chamber 2 maintains continuous combustion. The heat transfer oil pipe group 3 is arranged in the heating chamber 2. The heat transfer oil pipe group 3 includes a liquid inlet pipe 34, a plurality of spiral coils 31 arranged inside and outside, and a liquid outlet pipe 33 which are connected in sequence. The pipe mouth of the liquid inlet pipe 34 is arranged below the heating furnace body 1, and the pipe mouth of the liquid outlet pipe 33 is arranged above the heating furnace body 1. The liquid inlet direction is from bottom to top, which can better control the flow rate and prevent the heat transfer oil from flowing too fast and heating insufficiently. Figure 2 As shown, the outer wall of the spiral coil 31 is provided with a plurality of heat-absorbing fins 32, and the heat-absorbing fins 32 are arc-shaped annular metal sheets. The heat-absorbing fins 32 are obliquely arranged on the outer wall of the spiral coil 31. The obliquely arranged heat-absorbing fins 32 can expand the heating area of ​​the spiral coil 31, and can make the flame act on the spiral coil 31 more evenly; the smoke duct 5 is wound in the heat insulation layer 7, one end of the smoke duct 5 is arranged on the upper side of the heating chamber 2 and is connected to the heating chamber 2, and the other end is connected to the smoke exhaust port 6. The high-temperature smoke discharged from the heating chamber 2 passes through the smoke duct 5 and surrounds the heat insulation layer 7 for one week before being discharged from the smoke exhaust port 6. In the process of the smoke surrounding, the residual heat contained in the smoke will be absorbed to a certain extent by the heat insulation layer 7, thereby reducing the heat loss.

[0021] The working principle of this embodiment is as follows:

[0022] First, the burner 4 starts to ignite, and then the heating chamber 2 begins to burn and heat up. At this time, the heat transfer oil enters the spiral coil 31 from the liquid inlet pipe 34 at the bottom of the heating furnace body 1 through equipment such as a circulating pump. The spiral coil 31 is continuously heated by the flame of the burner 4 in the heating chamber 2, so that the heat transfer oil flowing through the spiral coil 31 can be heated by absorbing heat and finally discharged from the liquid outlet pipe 33 above the heating furnace body 1, and the exhaust gas in the heating chamber 2 is discharged from the top of the heating chamber 2 to multiple flue gas pipes 5, and is discharged from the smoke exhaust port 6 for subsequent treatment after surrounding the heat insulation layer 7 in the smoke pipe 5. During the surrounding process, a part of the exhaust gas is stably absorbed by the heat insulation layer 7 and retained in the heating furnace, thereby reducing heat loss.

[0023] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal", "head, tail" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0024] The above are only preferred embodiments of the present invention. Any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the above technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A gas-fired thermal oil heating furnace, characterized in that: include: A heating furnace body (1), wherein a heating chamber (2) is provided in the heating furnace body (1), and a heat insulating layer (7) is provided between the heating chamber (2) and an outer wall of the heating furnace body (1); A burner (4) is arranged on one side of the heating furnace body (1) and is connected to the heating chamber (2); A heat transfer oil pipe group (3) is arranged in the heating chamber (2), the heat transfer oil pipe group (3) comprising a liquid inlet pipe (34) connected in sequence, a plurality of spiral coils (31) arranged inside and outside, and a liquid outlet pipe (33), the outer side wall of the spiral coil (31) being provided with a plurality of heat absorbing fins (32).

2. A gas-fired thermal oil heating furnace according to claim 1, characterized in that: It also comprises a plurality of smoke ducts (5) and a smoke exhaust port (6), wherein the smoke duct (5) is arranged around the heat insulation layer (7), one end of the smoke duct (5) is arranged on the upper side of the heating chamber (2) and is connected to the heating chamber (2), and the other end is connected to the smoke exhaust port (6).

3. A gas-fired thermal oil heating furnace according to claim 1, characterized in that: The heat absorbing fin (32) is an arc-shaped annular metal sheet, and the heat absorbing fin (32) is obliquely arranged on the outer side wall of the spiral coil (31).

4. A gas-fired thermal oil heating furnace according to claim 1, characterized in that: The pipe opening of the liquid inlet pipe (34) is arranged below the heating furnace body (1), and the pipe opening of the liquid outlet pipe (33) is arranged above the heating furnace body (1).

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