CN206222357U - A kind of radiant tube double heat exchanger - Google Patents

Abstract

The utility model discloses a radiant tube double heat exchanger. The upper part of the heat exchanger body is connected with an ejector tube through a fourth flange. The inside of the flange body of the fourth flange is provided with an arc-shaped hole sealing gasket. The inside of the flange body of the third flange is provided with a third gasket, and the flue gas discharge outlet is connected to the upper part of the heat exchanger body at the lower end through the second flange, and the inside of the flange body of the second flange is provided with The second sealing gasket; the radiant tube double heat exchanger can preheat the combustion air at room temperature to above 550°C, realize energy saving and consumption reduction of industrial furnaces, and reduce thermal pollution to the environment. Both are equipped with fins, and the tube body is spliced by multiple finned tubes. The fins on the adjacent fin rings are staggered from each other, which belongs to the secondary heat exchange, which increases the heat exchange area and effectively utilizes the heat exchanger. The high-temperature heat of the discharge port adopts integral type, compact structure, simple structure and convenient installation.

Description

A radiant tube double heat exchanger

technical field

The utility model belongs to the technical field of heat exchangers, in particular to a double heat exchanger with radiant tubes.

Background technique

The industrial furnace heat exchanger in the existing industrial combustion system belongs to the first-stage heat exchanger, and the heat exchange efficiency is low. Generally, the preheating temperature of the combustion-supporting air at normal temperature is 450°C. Due to the limited volume in the furnace chamber, the heat exchange area is not large enough, resulting in a high temperature of the flue gas discharged from the heat exchanger and a large loss of heat. The pressure loss of the heat exchanger is relatively large, so it is necessary to select a high-power combustion-supporting fan to overcome the corresponding resistance, resulting in an increase in the power consumption of the combustion-supporting fan.

Utility model content

The purpose of this utility model is to provide a radiant tube for the problem that the heat exchange area of the industrial furnace heat exchanger in the existing industrial combustion system is not large enough, the heat loss is relatively large, and the preheating temperature of the combustion air is only 450°C. Double heat exchangers to heat the combustion air to 550°C.

In order to achieve the above purpose, the utility model provides the following technical solutions: a radiant tube double heat exchanger, including bolts, nuts, first gaskets, second gaskets, first gaskets, first flanges, second seals Gasket, second flange, upper part of heat exchanger body, third gasket, lower part of heat exchanger body, arc-shaped hole gasket, third flange, ejector tube, combustion air outlet, combustion air inlet, flue gas discharge The outlet and the fourth flange, the upper part of the heater body is connected with an ejector tube through the fourth flange, and the inside of the flange body of the fourth flange is provided with an arc-shaped hole sealing gasket, and the ejector tube passes through the fourth flange The lower part of the heat exchanger body is connected with the three flanges, and a third gasket is provided inside the flange body of the third flange. One end of the lower part of the heat exchanger body is provided with a combustion-supporting air outlet, and the combustion-supporting air inlet passes through The first flange is connected to the middle part of one side of the upper part of the heat exchanger body, the first sealing gasket is arranged at the junction of the gas air inlet and the first flange, and the exhaust gas outlet passes through the second flange and its lower end. The upper part of the heat exchanger body is connected, and the inside of the flange body of the second flange is provided with a second gasket.

Preferably, the fourth flange is provided with bolts, nuts, a first gasket, a second gasket and a first gasket.

Preferably, the upper part of the heat exchanger body and the lower part of the heat exchanger body are respectively composed of an outer tube, a finned tube and an inner tube.

The technical effects and advantages of the utility model: the radiant tube double heat exchanger can preheat the combustion-supporting air at room temperature to above 550°C, realize energy saving and consumption reduction of industrial furnaces, and reduce thermal pollution to the environment. Both the wall and the outer wall are provided with fins. The tube body is spliced by multiple finned tubes. The fins on the adjacent fin rings are staggered from each other, which belongs to the secondary heat exchange, which increases the heat exchange area and effectively utilizes The high-temperature heat at the discharge port of the heat exchanger is used, and it is integral, compact, simple in structure, and easy to install.

Description of drawings

Fig. 1 is the structural front view of the present utility model;

Fig. 2 is a structural side view of the utility model;

In the figure: 1. Bolt; 2. Nut; 3. The first gasket; 4. The second gasket; 5. The first gasket; 6. The first flange; 7. The second gasket; 8. The second Flange; 9. Upper part of heat exchanger body; 10. Third gasket; 11. Lower part of heat exchanger body; 12. Arc-shaped hole gasket; 13. Third flange; 14. Ejector tube; 15. Combustion support Air outlet; 16, combustion air inlet; 17, flue gas discharge outlet and 18, fourth flange.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The utility model provides a radiant tube double heat exchanger as shown in Fig. 1 and Fig. 2, comprising a bolt 1, a nut 2, a first gasket 3, a second gasket 4, a first sealing gasket 5, a first Flange 6, second gasket 7, second flange 8, upper part of heat exchanger body 9, third gasket 10, lower part of heat exchanger body 11, arc-shaped hole gasket 12, third flange 13, lead Injection pipe 14, combustion air outlet 15, combustion air inlet 16, flue gas discharge outlet 17 and fourth flange 18, the upper part of the heater body 9 is connected with injection pipe 14 through the fourth flange 18, the fourth The flange 18 is provided with bolts 1, nuts 2, first gasket 3, second gasket 4 and first gasket 5, and the inside of the flange body of the fourth flange 18 is provided with an arc-shaped hole gasket 12. , the ejector tube 14 is connected to the lower part 11 of the heat exchanger body through the third flange 13, the third gasket 10 is arranged inside the flange body of the third flange 13, and the lower part 11 of the heat exchanger body Combustion air outlet 15 is provided at one end, and the combustion air inlet 16 is connected to the middle part of one side of the upper part 9 of the heat exchanger body through the first flange 6, and the first sealing gasket 5 is arranged between the combustion air inlet 16 and the first At the junction of the flange 6, the flue gas discharge outlet 17 is connected to the upper part 9 of the heat exchanger body at the lower end through the second flange 8, and the second gasket 7 is provided inside the flange body of the second flange 8 , the upper part 9 of the heat exchanger body and the lower part 11 of the heat exchanger body are respectively composed of an outer tube, a finned tube and an inner tube.

Working principle: The upper part 9 of the heat exchanger body and the lower part 11 of the heat exchanger body are composed of outer tubes, finned tubes and inner tubes. The exhaust gas passes through the lower part of the heat exchanger and then to the upper part of the heat exchanger. The high-temperature exhaust gas It is discharged through the outer tube and finned tube layer, and the finned tube absorbs a large amount of heat from the exhaust gas. The combustion air enters the inner tube at the upper part of the heat exchanger from the inlet, and then passes through the inner tube into the inner tube and finned tube layer for preheating. The combustion air After preheating, it continuously enters the lower end of the heat exchanger. After the preheated air is heated again at the inner tube and the finned tube layer at the lower end of the heat exchanger, it enters the inner tube at the lower end after heating, and the inner tube directly passes into the injection tube 14 to complete the combustion. In the heating process of air, the heat exchanger and the burner are connected through the injection tube 14, and a small bellows is installed at the connection between the injection tube 14 and the burner, which can effectively prevent expansion and contraction caused by temperature changes. The first method Lan 6 is connected to the combustion air inlet 16, the second flange 8 is connected to the flue gas discharge outlet 17, the third gasket 10 is the flange connected to the radiant tube, the combustion air outlet is the heated combustion air outlet, and the radiant tube has double heat exchangers It is installed on the straight section of the top of the "W" type radiant tube and at the outlet of the burner product, and forms two relatively independent channels inside and outside with this as the boundary. The outer channel transports the combustion product of the radiant tube burner - high-temperature exhaust gas, which is in When flowing through the outside of the heat exchanger, a large amount of heat is transferred to the heat exchanger through the shark fin-shaped outer spines on the jacket, and the temperature of the exhaust gas is greatly reduced; the inner channel transmits combustion-supporting air, and the combustion-supporting air at normal temperature enters from the cold air outlet The heat exchanger is transferred from the inner tube of the heat exchanger outlet to the inner tube of the lower heat exchanger, and finally passes through the combustion air inlet. The air inlet pipe and the exhaust pipe are misplaced, which prolongs the time of cold and heat exchange and increases its exchange rate. The thermal area effectively guides the combustion air to the position of the exhaust gas discharge port, making full use of the residual heat of the high-temperature exhaust gas.

Finally, it should be noted that: the above is only a preferred embodiment of the utility model, and is not intended to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art , it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model, All should be included within the protection scope of the present utility model.

Claims (3)

1. A radiant tube double heat exchanger, comprising a heat exchanger body top (9), a combustion air inlet (16), a flue gas discharge outlet (17) and, it is characterized in that: the heat exchanger body top (9) The ejection pipe (14) is connected with the fourth flange (18), and the inside of the flange body of the fourth flange (18) is provided with an arc-shaped hole sealing gasket (12), and the ejection pipe (14) The lower part (11) of the heat exchanger body is connected through the third flange (13), and a third gasket (10) is arranged inside the flange body of the third flange (13), and the lower part of the heat exchanger body One end of (11) is provided with combustion-supporting air outlet (15), and combustion-supporting air inlet (16) is connected with the middle part of one side of described heat exchanger body upper part (9) through the first flange (6), and the first gasket ( 5) It is arranged at the junction of the combustion air inlet (16) and the first flange (6), and the flue gas discharge outlet (17) passes through the second flange (8) and the upper part of the heat exchanger body at the lower end ( 9) connection, the flange body of the second flange (8) is provided with a second gasket (7). 2. A radiant tube double heat exchanger according to claim 1, characterized in that: the fourth flange (18) is provided with bolts (1), nuts (2), first gaskets (3 ), the second gasket (4). 3. A radiant tube double heat exchanger according to claim 1, characterized in that: the upper part (9) of the heat exchanger body and the lower part (11) of the heat exchanger body are respectively composed of outer tubes, finned tubes and Inner tube composition.