Environment-friendly gas heat-conducting oil heating furnace

Abstract

This utility model discloses an environmentally friendly gas-fired thermal oil heater, including a shell, a top cover, a bottom plate, a burner, and inner and outer ring furnace tubes. A gas passage is provided in the center of the bottom plate, and the burner's combustion port is connected to the gas passage. A circular heat insulation layer is laid on the bottom plate. An insulated chamber is provided within the shell cavity. The insulated chamber includes a vertically arranged cylindrical stainless steel ring and a cylindrical refractory castable cylinder cast on the inner wall of the stainless steel ring. The top of the stainless steel ring is fixedly connected to the outer wall of the bottom of the inner ring furnace tube, and the bottom of the stainless steel ring passes through the heat insulation layer and is fixedly connected to the bottom plate. The bottom of the refractory castable cylinder is fixedly connected to the heat insulation layer. An annular refractory layer made of refractory concrete is cast between the heat insulation layer, the inner wall of the bottom of the refractory castable cylinder, and the gas passage. This utility model enables complete combustion of pyrolysis gas, making the heater more environmentally friendly and energy-efficient.

Description

Technical Field

[0001] This utility model relates to a heat transfer oil heater for industrial heat exchange, and more particularly to a gas-fired heat transfer oil heater that uses combustible gases such as pyrolysis gas produced by tire pyrolysis process as fuel, belonging to the field of industrial boiler technology. Background Technology

[0002] Due to the increasing national requirements for environmental protection and emissions, the application of thermal oil heaters is becoming more and more widespread. At present, thermal oil heaters of various structures are widely used in the fields of petroleum and chemical fiber for heating, drying or softening. Furthermore, with increasingly stringent environmental protection requirements, gas-fired thermal oil heaters that use natural gas, coke oven gas, or pyrolysis gas produced by tire pyrolysis processes as fuel are becoming increasingly popular.

[0003] However, traditional gas-fired thermal oil heaters have the following drawbacks when using pyrolysis gas produced by tire pyrolysis as fuel: the pyrolysis gas has a low calorific value, and the combustion zone of traditional gas-fired thermal oil heaters is usually an oil-cooled wall structure. This oil-cooled wall structure has a low temperature due to continuous heat exchange, which makes it impossible to achieve full and complete combustion of the pyrolysis gas, causing the heater to emit black smoke and pollute the environment. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an environmentally friendly gas-fired thermal oil heater that can achieve full and complete combustion of pyrolysis gas, prevent the heater from emitting black smoke and polluting the environment, and has a simple structure.

[0005] To solve the above-mentioned technical problems, this utility model adopts an environmentally friendly gas-fired thermal oil heater, including a cylindrical shell, a furnace top cover fixedly installed at the top of the shell, a bottom plate fixedly installed at the bottom of the shell, a burner, and vertical spiral inner and outer ring furnace tubes; at least one flue for exhausting flue gas is opened on the upper side wall of the shell, and a gas passage hole is opened in the middle of the bottom plate. The burner is installed below the bottom plate, and the combustion port of the burner is connected to the gas passage hole. The inner and outer ring furnace tubes are installed sequentially from the inside to the outside in the inner cavity of the shell. A circular heat insulation layer is laid on top. A combustion-insulating chamber is provided in the inner cavity of the shell. The combustion-insulating chamber includes a vertically arranged cylindrical stainless steel ring and a cylindrical refractory castable cylinder cast on the inner wall of the stainless steel ring. The top of the stainless steel ring is fixedly connected to the outer wall of the bottom of the inner ring furnace tube. The bottom of the stainless steel ring passes through the heat insulation layer and is fixedly connected to the bottom plate. The bottom of the refractory castable cylinder is fixedly connected to the heat insulation layer. An annular refractory layer made of refractory concrete is cast between the heat insulation layer, the inner wall of the bottom of the refractory castable cylinder and the gas passage.

[0006] In a preferred embodiment of this utility model, a plurality of horizontally arranged anchoring nails are provided inside the refractory casting cylinder, and the anchoring nails are fixedly installed on the inner wall surface of the stainless steel ring.

[0007] In a preferred embodiment of this utility model, the stainless steel plate of the stainless steel ring has a thickness of 1-2 mm, and the refractory castable of the refractory castable cylinder is refractory concrete with a thickness of 50-100 mm.

[0008] In a preferred embodiment of this utility model, a ceramic fiber refractory layer is provided on the inner side of the furnace top cover. The inner ring furnace tube and the outer ring furnace tube are connected in series through an intermediate connecting pipe. The intermediate connecting pipe includes a first connecting pipe, a second connecting pipe, and a collecting pipe. The collecting pipe is placed below the bottom plate. The upper end of the first connecting pipe is connected to the bottom end of the inner ring furnace tube, and the upper end of the second connecting pipe is connected to the bottom end of the outer ring furnace tube. The lower ends of the first connecting pipe and the second connecting pipe are respectively connected to the collecting pipe. The top end of the inner ring furnace tube passes through the ceramic fiber refractory layer and the furnace top cover and is connected to the oil outlet collecting pipe of the gas-fired thermal oil heating furnace. The top end of the outer ring furnace tube passes through the ceramic fiber refractory layer and the furnace top cover and is connected to the oil inlet collecting pipe of the gas-fired thermal oil heating furnace.

[0009] By adopting the above structure, this utility model has the following beneficial effects:

[0010] This invention features an insulated combustion chamber within the shell cavity. The chamber comprises a vertically positioned cylindrical stainless steel ring and a cylindrical refractory castable cylinder cast onto the inner wall of the stainless steel ring. The top of the stainless steel ring is fixedly connected to the outer wall of the bottom of the inner furnace tube, and the bottom of the stainless steel ring passes through an insulation layer and is fixedly connected to the base plate. The bottom of the refractory castable cylinder is also fixedly connected to the insulation layer. During operation, the burner injects pyrolysis gas upwards into the insulated combustion chamber through a gas passage for combustion. Because the refractory castable cylinder of the insulated combustion chamber is cast from refractory castable, the refractory castable does not undergo heat exchange during operation and maintains a consistently high temperature. This provides the pyrolysis gas with sufficient high-temperature insulated combustion space, ensuring complete and efficient combustion and effectively preventing the heating furnace from emitting black smoke that pollutes the environment.

[0011] This invention features several horizontally arranged anchor bolts inside the refractory casting cylinder. The anchor bolts are fixedly installed on the inner wall of the stainless steel ring, which makes the structure of the refractory casting cylinder more robust and its operation more reliable.

[0012] In this invention, the inner and outer ring furnace tubes are connected in series via an intermediate connecting pipe fitting. This fitting includes a first connecting pipe, a second connecting pipe, and a manifold. The upper end of the first connecting pipe is connected to the bottom end of the inner ring furnace tube, and the upper end of the second connecting pipe is connected to the bottom end of the outer ring furnace tube. The lower ends of both the first and second connecting pipes are connected to the manifold. The top end of the inner ring furnace tube passes through the ceramic fiber refractory layer and the furnace top cover, connecting to the oil outlet manifold of the gas-fired thermal oil heater. The top end of the outer ring furnace tube also passes through the ceramic fiber refractory layer and the furnace top cover, connecting to the oil inlet manifold of the gas-fired thermal oil heater. This structure allows for an almost zero outlet temperature difference in the thermal oil, thereby significantly extending its service life.

[0013] This invention has a simple structure, turning pyrolysis gas into a valuable resource and making the heating furnace more environmentally friendly and energy-efficient. Attached Figure Description

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the structure of an environmentally friendly gas-fired thermal oil heater according to this utility model. Detailed Implementation

[0016] See Figure 1The environmentally friendly gas-fired thermal oil heater shown includes a cylindrical shell 1, a furnace top cover 2 fixedly installed at the top of the shell 1, a base plate 3 fixedly installed at the bottom of the shell 1, a burner 4, and vertical spiral inner and outer ring furnace tubes 5 and 6. The outer wall of the shell 1 is covered with an aluminum silicate fiber insulation layer 14. At least one flue vent 1-1 for exhausting flue gas is provided on the upper side wall of the shell 1; two flue vents 1-1 are symmetrically arranged as shown in the figure. A gas passage hole 3-1 is provided in the middle of the base plate 3. The burner 4 is installed below the base plate 3, and the burner port of the burner 4 is connected to the gas passage hole 3-1. The inner ring furnace tubes 5 and outer ring furnace tubes 6 are installed sequentially from the inside to the outside in the inner cavity of the shell 1. A circular heat insulation layer 7 is laid on the base plate 3. The heat insulation layer 7 is preferably made of ceramic fiber material, but can also be made of rock wool, glass wool, etc. Four supports are installed around the base plate 3. The support column 15 of the shell 1 has a combustion-insulating chamber 8 inside the shell 1. The combustion-insulating chamber 8 includes a vertically arranged cylindrical stainless steel ring 8-1 and a cylindrical refractory castable cylinder 8-2 cast on the inner wall of the stainless steel ring 8-1. The stainless steel ring 8-1 is a cylindrical body formed by stainless steel plates, and the refractory castable cylinder 8-2 is a cylindrical body cast from refractory castable, preferably refractory concrete. The top of the stainless steel ring 8-1 is connected to the inner wall of the shell 1. The outer wall of the inner ring furnace tube 5 is preferably fixed by welding. The bottom end of the stainless steel ring 8-1 passes through the heat insulation layer 7 and is preferably fixed to the bottom plate 3 by welding. The bottom end of the refractory casting cylinder 8-2 is fixed to the heat insulation layer 7. An annular refractory layer 9 made of refractory concrete is cast between the heat insulation layer 7, the bottom inner wall of the refractory casting cylinder 8-2 and the gas passage 3-1. The cross-sectional shape of the annular refractory layer 9 is preferably inverted L-shaped.

[0017] As a preferred embodiment of this utility model, such as Figure 1 As shown, a number of horizontally arranged anchoring nails 8-3 are provided inside the refractory casting cylinder 8-2. The anchoring nails 8-3 are fixedly installed on the inner wall of the stainless steel ring 8-1 by welding.

[0018] In a preferred embodiment of this utility model, the stainless steel plate of the stainless steel ring 8-1 has a thickness of 1-2 mm, and the refractory castable of the refractory castable cylinder 8-2 is refractory concrete with a thickness of 50-100 mm.

[0019] As a preferred embodiment of this utility model, such as Figure 1As shown, a ceramic fiber refractory layer 10 is provided on the inner side of the furnace top cover 2. The inner ring furnace tube 5 and the outer ring furnace tube 6 are connected in series through an intermediate connecting pipe 11. The intermediate connecting pipe 11 includes a first connecting pipe 11-1, a second connecting pipe 11-2, and a collecting pipe 11-3. The collecting pipe 11-3 is placed below the bottom plate 3. The upper end of the first connecting pipe 11-1 is connected to the bottom end of the inner ring furnace tube 5. The upper end of the second connecting pipe 11-2 is connected to the bottom end of the outer ring furnace tube 6. The lower ends of the first connecting pipe 11-1 and the second connecting pipe 11-2 are respectively connected to the collecting pipe 11-3. The top end of the inner ring furnace tube 5 passes through the ceramic fiber refractory layer 10 and the furnace top cover 2 and is connected to the oil outlet manifold 12 of the gas-fired thermal oil heating furnace. The top end of the outer ring furnace tube 6 passes through the ceramic fiber refractory layer 10 and the furnace top cover 2 and is connected to the oil inlet manifold 13 of the gas-fired thermal oil heating furnace.

[0020] When this utility model is working, the burner 4 injects the pyrolysis gas upward into the combustion chamber 8 through the gas passage 3-1 for combustion. Since the refractory castable cylinder 8-2 of the combustion chamber 8 is made of refractory castable, the refractory castable does not undergo heat exchange during operation and always maintains a high temperature and stable state, thereby providing the pyrolysis gas with sufficient high temperature combustion space, so that the pyrolysis gas can be fully and completely burned. The flue gas after combustion is discharged from the two symmetrically arranged flue ports 1-1.

[0021] After trial use, this utility model can ensure that the pyrolysis gas is fully and completely combusted, turning the pyrolysis gas into a valuable resource, avoiding the pollution of the environment by black smoke emitted by the heating furnace, making the heating furnace more environmentally friendly and energy-saving, and with a simple structure, achieving good practical results.

Claims

1. An environmentally friendly gas-fired thermal oil heater, comprising a cylindrical shell (1), a furnace top cover (2) fixedly installed at the top of the shell (1), a bottom plate (3) fixedly installed at the bottom of the shell (1), a burner (4), and vertical spiral inner ring furnace tubes (5) and outer ring furnace tubes (6); at least one flue gas outlet (1-1) for exhausting flue gas is provided on the upper side wall of the shell (1), a gas passage hole (3-1) is provided in the middle of the bottom plate (3), the burner (4) is installed below the bottom plate (3), and the combustion port of the burner (4) is connected to the gas passage hole (3-1), the inner ring furnace tubes (5) and the outer ring furnace tubes (6) are installed sequentially from the inside to the outside in the inner cavity of the shell (1), and a circular heat insulation layer (7) is laid on the bottom plate (3), characterized in that: An insulated chamber (8) is provided in the inner cavity of the shell (1). The insulated chamber (8) includes a vertically arranged cylindrical stainless steel ring (8-1) and a cylindrical refractory casting cylinder (8-2) cast on the inner wall of the stainless steel ring (8-1). The top of the stainless steel ring (8-1) is fixedly connected to the bottom outer wall of the inner ring furnace tube (5). The bottom of the stainless steel ring (8-1) passes through the heat insulation layer (7) and is fixedly connected to the bottom plate (3). The bottom of the refractory casting cylinder (8-2) is fixedly connected to the heat insulation layer (7). An annular refractory layer (9) made of refractory concrete is cast between the heat insulation layer (7) and the bottom inner wall of the refractory casting cylinder (8-2) and the gas passage hole (3-1).

2. The environmentally friendly gas-fired thermal oil heater according to claim 1, characterized in that: A number of horizontally arranged anchor pins (8-3) are provided inside the refractory casting cylinder (8-2), and the anchor pins (8-3) are fixedly installed on the inner wall surface of the stainless steel ring (8-1).

3. The environmentally friendly gas-fired thermal oil heater according to claim 1, characterized in that: The stainless steel plate of the stainless steel ring (8-1) is 1-2 mm thick, and the refractory castable of the refractory castable cylinder (8-2) is refractory concrete with a thickness of 50-100 mm.

4. The environmentally friendly gas-fired thermal oil heater according to claim 1, 2, or 3, characterized in that: A ceramic fiber refractory layer (10) is provided on the inner side of the furnace top cover (2). The inner ring furnace tube (5) and the outer ring furnace tube (6) are connected in series through an intermediate connecting pipe (11). The intermediate connecting pipe (11) includes a first connecting pipe (11-1), a second connecting pipe (11-2), and a manifold (11-3). The manifold (11-3) is placed below the bottom plate (3). The upper end of the first connecting pipe (11-1) is connected to the bottom end of the inner ring furnace tube (5). The second connecting pipe (11-2) is connected to the bottom end of the inner ring furnace tube (5). -2) The upper end is connected to the bottom end of the outer ring furnace tube (6). The lower ends of the first connecting pipe (11-1) and the second connecting pipe (11-2) are respectively connected to the collecting pipe (11-3). The top end of the inner ring furnace tube (5) passes through the ceramic fiber refractory layer (10) and the furnace top cover (2) and is connected to the oil outlet manifold (12) of the gas-fired thermal oil heating furnace. The top end of the outer ring furnace tube (6) passes through the ceramic fiber refractory layer (10) and the furnace top cover (2) and is connected to the oil inlet manifold (13) of the gas-fired thermal oil heating furnace.

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