RU2409610C2 - Tubular heating furnace - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: furnace includes radiant chamber lined with heat-proof material, radiant product coil, bottom with burner devices, arch, convection chamber lined with heat-proof material, convection product coil, reducer and stack. Radiant coil consists of the tubes connected to each other by doubles and suspended by means of brackets attached to the wall of radiant chamber. Convention coil consists of finned tubes installed in holes of support grids and connected to each other with doubles. Each of tubes of radiant and convection product coils is enclosed in tube-cover, and gap between tubes and tubes-covers is filled with microcellular heat transfer powder.

EFFECT: increasing efficiency of the furnace, intensifying heat exchange of heating surface, excluding burn-through of lower part of coil tubes and their early failure, simplifying removal of combustion products from the surface of tubes, and simplifying the repair of coils.

2 dwg

Description

The invention relates to a device for a tubular heating furnace intended for technological heating of liquid and gaseous heat carriers in enterprises of the chemical, petrochemical and oil refining industries.

Known tube furnace for the processing of petroleum products, including grocery pipes placed between the inner and outer side walls, equipped with burners for burning liquid fuel, located between the inner walls made perforated, and perforated partitions placed between these walls (a.s. SU No. 981344, C10G 9/20, 05.21.81).

The disadvantage of this design of a tubular furnace is the insufficiently economical use of the temperature of the combustion products both in the radiation chamber and in the convection chamber, low heat transfer of the heating surfaces due to clogging of the surface of the finned tubes of the coils of the combustion products, which leads to additional fuel consumption and reduced reliability of the furnace.

A tube furnace is known, including a radiant and convection chambers with heating surfaces and a duct system, in which pipes of convective heating surfaces are made with transverse steps that are increased at the inlet and continuously decreasing along the gas path (AS SU No. 1118667, C10G 9/20, F27B 5/00, 07.28.82).

The disadvantages of this design of a tubular heating furnace are the insufficient reliability of operation of the furnace due to clogging by the combustion products of the surface of the finned tubes of the convective coil, which affects the heat exchange of the heating surface, increases fuel consumption and reduces the life of the coil and the reliability of the furnace as a whole; insufficient use of thermal energy, flue gases to heat the product in radiant and convective chambers.

A tube furnace is known, including a radiant chamber with a radiant coil, in the lower part of which there is a burner, a convection chamber with a convective coil and a chimney placed above the radiant chamber (AS SU No. 1244168, C10G 9/20. 07.10.84 - prototype) .

The main disadvantages of a tubular heating furnace provided as a prototype are:

- during operation of the burner device in the hearth of the furnace, the lower part of the radiant product coil is most often subjected to direct flame emission, which leads to burnout of pipes and premature failure of the entire radiant product coil;

- during operation of burner devices, especially on heavy fuel oil fuel, the surface of the finned tubes of a convective food coil placed in a convection chamber is quickly covered with soot, which sharply reduces the calorific value of the convective food coil.

In such cases, to clean the convection chamber in the furnace design, various designs of soot blowers are used, for which purpose additional space is provided in the design of the convection chamber for their possible placement.

This goal is achieved in that a tubular heating furnace, including a radiant chamber lined with heat-resistant material, a radiant food coil, consisting of pipes interconnected by twins and suspended on brackets fixed to the wall of the radiant chamber, underneath with burner devices, a roof lined with heat-resistant material convection chamber, convective food coil, consisting of finned tubes installed in the holes of the support grids and interconnected by twins, odnik and chimney according to the invention the radiant and convective tube coils product-wear of the cladding tube and the gap between the pipe and the jacket pipe is filled with a microporous powder heat transfer.

A significant difference in the proposed tubular heating furnace is that the pipes of the radiant and convective product coils are clad pipes, and the gap between the pipes of the product coils and the shell pipes is filled with microporous heat transfer powder.

Figure 1 shows a tubular heating furnace, a General view;

figure 2 - convective grocery coil, left side view (rotated).

In the drawings and in the text, the following notation:

1 - radiant camera;

2 - convection chamber;

3 - lining with heat-resistant material;

4 - radiant grocery coil;

5 - pipe radiant grocery coil;

6 - twins of the radiant grocery coil;

7 - pipe tubes;

8 - microporous heat transfer powder;

9 - an arm;

10 - under a tubular heating furnace;

11 - burner device;

12 - arch of a tubular heating furnace;

13 - convective grocery coil;

14 - pipe convective grocery coil;

15 - supporting lattice convective grocery coil;

16 - pipe-shell pipe convective grocery coil;

17 - microporous heat transfer powder;

18 - doubles of the convective grocery coil;

19 - chimney;

20 - adapter.

The tubular heating furnace consists of radiant 1 and convective 2 chambers, the inner surfaces of which are lined with heat-resistant material 3. In the radiant chamber 1 there is a radiant product coil 4, consisting of pipes 5 connected by doubles 6. The pipes 5 of the radiant product coil 4 according to the invention are dressed in the shell pipe 7, and the gap between the pipe 5 of the radiant product coil 4 and the pipe shell is filled with microporous heat transfer powder 8. The radiant product coil 4 is suspended on the bracket x 9 fixed to the lined material 3 radiant chamber 1. The hearth 10 of the heating furnace tube mounted burners 11. Radiant and convective 1 chamber 2 is connected between the dome 12.

In the convection chamber 2 there is a convective food coil 13. The convective food coil consists of pipes 14, which are installed in the holes of the support grilles 15. According to the invention, the pipes 14 of the convective food coil 13 are dressed in shell pipes 16, and the gap between the pipe 14 and the shell pipe 16 is filled with microporous heat transfer powder 17. The pipes 14 of the convective product coil 13 are interconnected by doubles 18. The convection chamber 2 and the chimney 19 are interconnected by an adapter 20.

Tubular heating furnace operates as follows. The fuel supplied to the tubular heating furnace is burned in the burner 11. The released thermal energy is transferred to the heated product in the radiant product coil 4 of the radiant chamber 1.

According to the invention, the released thermal energy, by heating the surface of the pipe-shell 7, is transferred to the heated product through microporous heat transfer powder 8 and pipe 5 of the radiant product coil 4.

Thus, during operation of the burner device 11, the lower parts of the pipe 5 of the radiant product coil 4 are not exposed to direct radiation from the torch, which eliminates burnout of the pipe 5 and premature failure of the entire radiant coil 4.

The moving flow of thermal energy from the radiant chamber 1 through the arch 12 enters the convection chamber 2. In this case, the flow of thermal energy propagates over the entire surface of the convective chamber 2 and heats the convective food coil 13.

According to the invention, the thermal energy in the convection chamber, heating the surface of the shell pipe 16, is transferred to the microporous heat transfer powder 17, the pipes 14 and the heated product.

Therefore, when the burner device 11 is operating, especially on heavy fuel oil, the emitted combustion products deposited on the surface of the sheath pipe 16 of the pipe 14 of the convective product coil 13 are easily removed. In addition, thermal energy is removed in large volume due to the high thermal conductivity of microporous heat transfer powders 8 and 17, which fill the gaps between the shell pipes 7 and 16 and pipes 5 and 14 of radiant 4 and convective 13 product coils, respectively.

Claims (1)

Tubular heating furnace, including a radiant chamber lined with heat-resistant material, a radiant food coil, consisting of pipes interconnected by twins and suspended on brackets fixed to the wall of the radiant chamber, underneath with burner devices, a vault, a convection chamber lined by heat-resistant material, a convective food coil consisting of finned tubes installed in the holes of the support grids and interconnected by twins, an adapter and a chimney, characterized by That each of the radiant and convective tube coils product wearing the jacket pipe and the gap between the pipe and the jacket pipe is filled with a microporous powder heat transfer.

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