RU2246524C1 - Tubular furnace - Google Patents

Abstract

FIELD: tubular furnaces for heating liquid and gaseous heat-transfer agents in oil refining and petrochemical industries.

SUBSTANCE: proposed tubular furnace includes radiant and convective chambers with heating surfaces, burner units and smoke stack; it is also provided with detachable filters in form of rotary tubular elements made from microporous material; one element is located between radiant and convective chambers and other element is located at convective chamber outlet before smoke stack.

EFFECT: enhanced operational reliability; intensification of heat exchange in radiant and convective chambers.

2 dwg

Description

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

Known tube furnace for the processing of petroleum products, including food pipes placed between the inner and outer side walls provided with burners, burners for burning liquid fuel, located between the inner walls made perforated, and perforated partitions placed between these walls (a.s. SU No. 981344, C 10 G 9/20, 05.21.81).

The disadvantage of this design of a tube 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 exchange of the heating surfaces due to clogging of the surface of the finned tubes of the coils with combustion products, which leads to additional fuel consumption and a decrease in the reliability of the furnace.

A tube furnace is also known, including a radiant and convective chambers with heating surfaces and a duct system, in which pipes of convective heating surfaces are made with transverse steps increased at the inlet and continuously decreasing along the course of the gases (A.S. SU No. 1118667, C 10 G 9 / 20, F 27 B 5/00, 07/28/82 - prototype).

The main disadvantages given as a prototype tube furnace are:

- insufficient reliability of operation of the furnace due to clogging by the combustion products of the surfaces 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 the thermal energy of flue gases to heat the product in radiant and convective chambers.

The aim of the invention is to increase the reliability of operation of the furnace and the intensification of heat transfer of the heating surface.

This goal is achieved in that the tubular furnace, including radiant and convection chambers with heating surfaces, burner devices and a chimney, is equipped with removable filters made in the form of rotating tubular elements of microporous material, one of which is located between the radiant and convective chambers, and the other - at the exit of the convection chamber in front of the chimney.

A significant difference in the proposed furnace is that it has removable filters made in the form of rotating tubular elements of microporous material, one of which is installed between the radiant and convective chambers, and the other at the exit of the convection chamber in front of the chimney.

Figure 1 shows a tube furnace, a General view; figure 2 - installation diagram of the rotating elements of the removable filters.

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

1 - radiant camera

2 - convection chamber

3 - convection chamber coil

4 - refractory insulation

5 - chimney

6 - burners

7 - coil of the radiant chamber

8, 9 - removable filters

10 - tubular elements

11 - case

12 - electric motor

13 - coupling

14 - gear

15 - chain drive

16 - gear transmission.

The tube furnace consists of radiant 1 and convective 2 chambers. In the convection chamber there is a food coil 3. The furnace has refractory insulation 4. The upper part of the convection chamber is connected to the chimney 5. Burners are installed in the lower part of the furnace 6. In the radiant chamber there is a radiant food coil 7. Between the radiant and convection chambers according to the invention, a removable filter 8. located at the exit of the convection chamber 2 in front of the chimney 5 according to the invention there is a second removable filter 9. The removable filters are made in the form of rotating tubular elements 10 of micro porous material located in the housing 11. The tubular elements 10 are driven in rotation from an electric motor 12 through a coupling 13, a gearbox 14, a chain 15 and a gear 16 feed. All elements of the furnace are fixed on the frame.

The furnace operates as follows. The fuel supplied to the furnace is burned in the burners 6. The thermal energy released in this case is transferred to the heated product in the coil 7 of the radiant chamber 1. The tubular elements 10 of the removable filter 8, mounted between the radiant and convection chambers, rotate to slow down the dissipation of thermal energy from the radiant to convection chamber, which allows for the heating of the product in a shorter time and ultimately reduce fuel consumption. At the same time, the finned microporous coating of the rotating elements 10 absorbs the accumulated products of combustion (carbon black, sulfur, etc.) in the heat flow entering the convection chamber 2. This significantly reduces the degree of contamination of the heating surface of the convective coil 3, and increases its heat transfer rate. As the radiant chamber 1 is heated, the flue gases enter the zone of the convection chamber 2 and, heating the coolant and air, leave the furnace through the chimney 5. A removable filter 9, installed at the outlet of the convection chamber 2 in front of the chimney 5, reduces the rate of heat flux dispersion from convection zone, which allows maximum use of its energy. In this case, the temperature of the flue gases at the outlet increases to a temperature above the dew point temperature, which eliminates the formation of condensate on the pipes of the convective coil and increases the reliability of operation of the furnace.

The technical advantages of the proposed tube furnace compared to the prototype are that the placement of removable filters made in the form of rotating tubular elements of microporous material, one between the radiant and convective chambers, and the other at the exit of the convection chamber in front of the chimney, improves heat transfer the fin surface of the convection coil by reducing pollution and increase its service life, increase the reliability of operation of the furnace. In addition, the ability to control the heat flow allows you to maximize the use of flue gas energy for heating the radiant and convective chambers, which reduces fuel consumption.

Claims (1)

A tube furnace, including radiant and convection chambers with heating surfaces, burners and a chimney, characterized in that it is equipped with removable filters made in the form of rotating tubular elements made of microporous material, one of which is located between the radiant and convective chambers, and the other at the exit of the convection chamber in front of the chimney.

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