CN212339954U

CN212339954U - Head smoke exhaust pipe type heating furnace

Info

Publication number: CN212339954U
Application number: CN202020892262.4U
Authority: CN
Inventors: 靳世平; 裴青龙; 文午琪; 闵绍安; 李小文; 吴海涓; 陈勇波; 涂文斌; 熊亮
Original assignee: Wuhan Anhe New Energy Technology Ltd
Current assignee: Wuhan Anhe New Energy Technology Ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2021-01-12
Anticipated expiration: 2030-05-25

Abstract

The utility model provides a head smoke exhaust pipe type heating furnace, wherein a furnace pipe is arranged in a furnace chamber; the burner is arranged at the head part, namely the bottom part of the hearth, and a special-shaped partition plate is arranged inside the burner; the inner cavity of the special-shaped partition board is an air channel, the outer cavity of the special-shaped partition board is a flue gas channel, and the special-shaped partition board, the flue gas channel and the air channel form an air preheater; one end of the air channel is connected with a combustion fan through a connecting pipeline, and the other end of the air channel is communicated with the hearth; one end of the flue gas channel is connected with a draught fan through a connecting pipeline, and the other end of the flue gas channel is communicated with a hearth; a fuel spray gun is arranged in the combustor, one end of the fuel spray gun is connected with a fuel regulating valve through a connecting pipeline, and the other end of the fuel spray gun is communicated with a hearth. The utility model adopts the head smoke exhaust structure to reduce the weight of the heating furnace; the high-temperature flue gas forms backflow in the hearth, which is beneficial to strengthening combustion, heat transfer and temperature uniformity; the flue gas is discharged from the head, and when the flue gas purification equipment is required to be additionally arranged, the flue gas purification equipment can be realized on the ground of the head without changing the bearing structure of the furnace body.

Description

Head smoke exhaust pipe type heating furnace

Technical Field

The utility model relates to the technical field of tube type heating furnaces, in particular to a head smoke exhaust tube type heating furnace,

background

The tubular heating furnace is widely used for material process heating in petrochemical industry and coal chemical industry.

The tube type heating furnace is internally provided with heated fluid and externally provided with a heat source, and is divided into two categories of fuel combustion flame heating and electric heating.

For a tubular heating furnace heated by fuel combustion flame, a burner arranged at the head of the heating furnace is used for supplying fuel and oxidant (generally air), high-temperature flame is generated by combustion in a hearth, the heat of the flame is transferred to fluid materials in the furnace tube in a heat transfer mode of radiation, convection and heat conduction to enable the materials to reach the temperature required by the process for the next procedure, and flue gas after combustion heat transfer and temperature reduction is discharged from the tail of the heating furnace.

A typical tube furnace is of vertical construction, as shown in fig. 3. The burner is usually arranged at the bottom of the heating furnace, fuel and combustion-supporting air are mixed and combusted in the hearth through a burner spray gun, combustion flue gas transfers heat to fluid in a furnace tube heating furnace tube in a radiation and convection mode in the hearth and a convection section, and the fluid is discharged to the atmosphere from the upper part (tail part) of the heating furnace through a chimney after being cooled.

In order to meet the requirement of energy conservation, an air preheater is often additionally arranged on a flue at the upper part (tail part) of the tubular heating furnace with higher exhaust gas temperature, waste heat in the flue gas is utilized to heat combustion-supporting air, the heated combustion-supporting air is sent back to a combustor to enter a hearth for supporting combustion, and heat released by combustion of a part of fuel is replaced, so that the fuel consumption is reduced, and the effects of saving energy and reducing cost are achieved.

But the tail smoke exhausting method has the following defects:

1. when the flue gas passes through the tail convection section and the air preheater, the heat transfer efficiency is low because the flue gas temperature is low and the equipment surface area is large and the heat dissipation is more, so that the overall efficiency of the heating furnace is lower;

2. the convection section and the air preheater have large volumes and heavy weights, so that the requirement on the lower bearing structure of the heating furnace is high, the cost is increased, and meanwhile, the upper convection section and the air preheater are inconvenient to maintain and replace;

3. the flue gas flows upwards vertically, which is not beneficial to adjusting the temperature distribution in the furnace to achieve the purpose of uniform heat transfer;

4. the flue gas is directly discharged upwards, and the flue is at the high altitude, so that the tail flue gas treatment environmental protection equipment for reducing sulfur oxides and nitrogen oxides is not convenient to install additionally.

SUMMERY OF THE UTILITY MODEL

To the technical problem, the utility model provides a tubular heating furnace structure that head was discharged fume, unite two into one afterbody air heater and head combustor, cancellation afterbody (upper portion) inefficiency convection current section and air heater, fuel and combustion-supporting air get into the mixed burning in the furnace through head (lower part) combustor, the complete flue gas of burning passes through the high-temperature high-efficient radiation heat transfer with the material in the individual boiler tube of heat transfer, then the backward flow flows back, give combustion-supporting air with flue gas waste heat transfer through the air heater of taking in the head combustor, the flue gas that has cooled down is taken out to concentrate or discharge in the independent flue from heating furnace head combustor exhanst gas outlet at last.

The specific technical scheme is as follows:

the head smoke exhaust pipe type heating furnace comprises a hearth, a furnace pipe, a burner, a combustion fan, an induced draft fan, a fuel regulating valve and a stop valve;

a furnace tube is arranged in the hearth;

the burner is arranged at the head part, namely the bottom part of the hearth, and a special-shaped partition plate is arranged inside the burner; the inner cavity of the special-shaped partition board is an air channel, the outer cavity of the special-shaped partition board is a flue gas channel, and the special-shaped partition board, the flue gas channel and the air channel form an air preheater; one end of the air channel is connected with a combustion fan through a connecting pipeline, and the other end of the air channel is communicated with the hearth; one end of the flue gas channel is connected with a draught fan through a connecting pipeline, and the other end of the flue gas channel is communicated with a hearth;

a fuel spray gun is arranged in the combustor, one end of the fuel spray gun is connected with a fuel regulating valve through a connecting pipeline, and the other end of the fuel spray gun is communicated with a hearth.

The head (lower) smoke exhaust pipe type heating furnace is provided with a burner with a heat exchanger, and a head (lower) smoke exhaust structure is adopted, so that a convection section, an air preheater and a chimney at the tail (upper) of the heating furnace in the prior art can be completely removed, and the weight of the heating furnace is greatly reduced; the high-temperature flue gas forms backflow in the hearth, which is beneficial to strengthening combustion, heat transfer and temperature uniformity; the flue gas is discharged from the head part (lower part), and when the flue gas purification equipment is required to be additionally arranged, the flue gas purification equipment can be realized on the ground of the head part without changing the bearing structure of the furnace body.

Or, the utility model provides a head and tail jointly discharge fume tubular furnace structure, unite two into one afterbody air heater and head combustor, cancel afterbody (upper portion) low efficiency convection section and air heater, fuel and combustion-supporting air get into the mixed burning in the furnace through head (lower part) combustor, the complete flue gas of burning passes through the high-temperature high-efficient radiation heat transfer with the heat transfer for the material in the boiler tube, then reverse flow back, give combustion-supporting air with flue gas waste heat transfer through the air heater of taking in the head combustor, the flue gas that has cooled down is taken out to discharge in the chimney of heating furnace afterbody (upper portion) from heating furnace head combustor exhanst gas outlet at last.

The technical scheme is further that a chimney is arranged at the tail part, namely the upper part of the hearth, and a flue valve plate is arranged between the chimney and the hearth; the air outlet of the induced draft fan is connected with the chimney.

A flue valve plate is arranged between a chimney at the tail part of the heating furnace and a hearth, and partial or all flue gas can be discharged from the tail part of the heating furnace when necessary, so that the temperature distribution of the hearth of the heating furnace is adjusted, the generation amount of nitrogen oxides is reduced, and the tail flue is used in an auxiliary manner when a burner at the head part of the heating furnace discharges unsmooth smoke.

The tubular heating furnace is provided with a burner with a heat exchanger, and adopts a combined smoke exhaust structure of a head part (lower part) and a tail part (upper part), so that an air preheater at the tail part (upper part) of the heating furnace can be removed, and the weight of the heating furnace is reduced; part of high-temperature flue gas forms backflow in the hearth, which is beneficial to strengthening combustion, heat transfer and temperature uniformity; the proportion of the smoke discharged from the head part (lower part) and the tail part (upper part) is adjusted through the flue valve plate, so that the reasonable distribution of the heat supply amount and the smoke temperature in the hearth can be realized, the load of the heating furnace and the temperature adjustment flexibility are increased, and the requirements of certain processes on high-precision temperature adjustment are met.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of embodiment 2 of the present invention;

FIG. 3 is a schematic view of a tubular heating furnace according to the prior art.

Detailed Description

The specific technical solution of the present invention is explained with reference to the drawings.

Example 1

As shown in fig. 1, the head smoke exhaust pipe type heating furnace comprises a hearth 1, a furnace pipe 2, a burner 3, a combustion fan 6, an induced draft fan 5, a fuel regulating valve 7 and a cut-off valve 8;

a furnace tube 2 is arranged in the hearth 1;

the burner 3 is arranged at the head part, namely the bottom part, of the hearth 1, and a special-shaped partition plate 34 is arranged inside the burner 3; the inner cavity of the special-shaped partition plate 34 is an air channel 32, the outer cavity of the special-shaped partition plate is a flue gas channel 31, and the special-shaped partition plate 34, the flue gas channel 31 and the air channel 32 form the air preheater 4; one end of the air channel 32 is connected with the combustion fan 6 through a connecting pipeline, and the other end of the air channel is communicated with the hearth 1; one end of the flue gas channel 31 is connected with the induced draft fan 5 through a connecting pipeline, and the other end of the flue gas channel is communicated with the hearth 1;

the combustor 3 is internally provided with a fuel spray gun 33, one end of the fuel spray gun 33 is connected with the fuel regulating valve 7 through a connecting pipeline, and the other end of the fuel spray gun 33 is communicated with the hearth 1.

When the tubular heating furnace works, fuel enters the hearth 1 through the fuel spray gun 33 and combustion-supporting air entering the hearth 1 through the air channel 32 of the burner 3 are mixed and combusted to form high-temperature flue gas for heating materials in the furnace tube 2, and the flow rate of the high-temperature flue gas is adjusted by the fuel adjusting valve 7.

The flow of the combustion-supporting air is adjusted by a frequency converter of the rotating speed of the combustion-supporting fan 6.

The flue gas in the hearth 1 is discharged from a flue gas channel 31 in the combustor 3 and is discharged to a centralized or independent flue by an induced draft fan 5 through a connecting pipeline.

The utility model discloses except that head (lower part) combustor 3 is from taking flue gas passageway 31, whole heating furnace is totally enclosed furnace, and combustor 3 is from taking air heater 4, and the design has combustion air entry and exhanst gas outlet, and the flue gas forms the backward flow because business turn over opposite direction in the stove. By adopting the smoke exhaust structure at the head part (lower part), the convection section, the air preheater and the chimney at the tail part (upper part) of the heating furnace can be completely removed, the volume of the heating furnace is greatly reduced, and the weight of the heating furnace is lightened; the high-temperature flue gas forms backflow in the hearth 1, which is beneficial to strengthening combustion, heat transfer and temperature uniformity; the flue gas is discharged from the head part (lower part), and when the flue gas purification equipment is required to be additionally arranged, the flue gas purification equipment can be realized on the ground of the head part without changing the bearing structure of the furnace body.

Example 2

As shown in fig. 2, on the basis of embodiment 1, a chimney 10 is installed at the tail part, i.e. the upper part, of a hearth 1, and a flue valve plate 9 is arranged in the chimney 10; and the air outlet of the induced draft fan 5 is connected with a chimney 10.

The combined smoke exhaust structure of the head part (lower part) and the tail part (upper part) is adopted, the proportion of smoke exhausted from the head part (lower part) and the tail part (upper part) is adjusted through the flue valve plate 9, the reasonable distribution of heat supply and smoke temperature in a hearth can be realized, the load and temperature adjustment flexibility of the heating furnace are increased, and the high-precision temperature adjustment requirements of certain processes are met. Meanwhile, an air preheater at the tail part (upper part) of the traditional heating furnace can be removed, so that the weight of the heating furnace is reduced; part of high-temperature flue gas forms backflow in the hearth, which is beneficial to strengthening combustion, heat transfer and temperature uniformity; when the flue gas needs to purify, can install environment-friendly device additional on head ground, need not change furnace body bearing structure, install flue gas purification processing apparatus additional simultaneously after, can handle the proportion of flue gas and afterbody untreated flue gas according to emission control requirement and actual combustion pollutant yield, reach not only discharge to reach standard but also reduce the purpose of environmental protection working costs.

Claims

1. The head smoke exhaust pipe type heating furnace comprises a hearth (1), a combustor (3), a combustion fan (6), an induced draft fan (5), a fuel regulating valve (7) and a stop valve (8); a furnace tube (2) is arranged in the hearth (1);

the furnace is characterized in that the burner (3) is arranged at the head part, namely the bottom part, of the hearth (1), and a special-shaped partition plate (34) is arranged inside the burner (3); the inner cavity of the special-shaped partition plate (34) is an air channel (32), the outer cavity of the special-shaped partition plate is a flue gas channel (31), and the special-shaped partition plate (34), the flue gas channel (31) and the air channel (32) form an air preheater (4); one end of the air channel (32) is connected with the combustion fan (6) through a connecting pipeline, and the other end of the air channel is communicated with the hearth (1); one end of the flue gas channel (31) is connected with the induced draft fan (5) through a connecting pipeline, and the other end of the flue gas channel is communicated with the hearth (1);

a fuel spray gun (33) is arranged in the combustor (3), one end of the fuel spray gun (33) is connected with the fuel regulating valve (7) through a connecting pipeline, and the other end of the fuel spray gun is communicated with the hearth (1).

2. The head smoke-discharging tube heating furnace according to claim 1, wherein a chimney (10) is installed at the tail part, i.e. the upper part, of the hearth (1), and a flue valve plate (9) is arranged between the chimney (10) and the hearth (1); the air outlet of the induced draft fan (5) is connected with the chimney (10).