CN111412488A

CN111412488A - Boiler preheats hot blast blowpipe apparatus with flue gas

Info

Publication number: CN111412488A
Application number: CN202010408427.0A
Authority: CN
Inventors: 任英超
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-14
Filing date: 2020-05-14
Publication date: 2020-07-14

Abstract

The invention discloses a boiler air inlet preheating device by utilizing flue gas, which is arranged on a discharge flue of a boiler and comprises a box body and a heat exchange tube group, wherein the top of the box body is communicated with a smoke outlet, and the bottom end of the box body is communicated with a boiler smoke discharge tube; the box body is provided with an inner cavity, the heat exchange tube group is fixed in the box body and provided with an air inlet and an air outlet, the air inlet is communicated with the atmosphere, and the air outlet is communicated with an air inlet pipe of a boiler blower. The boiler disclosed by the invention utilizes the flue gas to preheat the air inlet device, is arranged on the exhaust flue of the boiler, the exhaust gas of the boiler passes through the gap outside the heat exchange tube group and is exhausted through the exhaust port, the air sucked by the air blower flows into the air blower from the inside of the heat exchange tube group, and the air passing through the heat exchange tube group is heated by the boiler in the process of exhausting the gas, so that the temperature of the air entering the combustion chamber of the boiler is increased, the temperature of a furnace hearth is effectively increased, the fuel is saved, the energy is saved, the production cost is reduced for enterprises, the emission of pollutants is reduced, and the contribution to environmental protection is made.

Description

Boiler preheats hot blast blowpipe apparatus with flue gas

Technical Field

The invention relates to the technical field of boiler equipment, in particular to a boiler air inlet preheating device utilizing flue gas.

Background

As is well known, a blower is a ventilating device, and the blower is eccentrically operated by a rotor offset in a cylinder, and sucks, compresses, and discharges air by changing the volume between vanes in a rotor groove. The blower is used for accurately conveying a certain air quantity and is generally used for combustion-supporting air supply of boilers and the like. In the prior art, a blower directly sucks natural air and conveys the natural air into a boiler to support combustion of the boiler.

At present, with the development of economy, environmental protection is more and more emphasized, and all bituminous coal boilers transform fuels into natural gas boilers or biomass fuels in succession in China since 2017.

However, the operating cost of natural gas is more than three times of that of coal, thus increasing the production cost for enterprises in no way, and most of users of natural gas boilers are small and medium-sized enterprises, so that the competitiveness of the small and medium-sized enterprises can be improved only by reducing the cost.

Therefore, how to provide a boiler utilizing flue gas to preheat an air inlet device which can reduce the production cost for medium and small enterprises is a problem to be solved urgently by technical personnel in the field.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art.

Therefore, one purpose of the invention is to provide a boiler air inlet preheating device by utilizing flue gas, which is arranged on a discharge flue of the boiler and comprises a box body and a heat exchange tube group, wherein the top of the box body is communicated with a smoke outlet, and the bottom end of the box body is communicated with a boiler smoke exhaust tube; the box body is provided with an inner cavity, the heat exchange tube group is fixed inside the box body and is provided with an air inlet and an air outlet, the air inlet is communicated with the atmosphere, and the air outlet is communicated with an air inlet pipe of a boiler blower.

The boiler disclosed by the invention utilizes the flue gas to preheat the air inlet device, is arranged on the exhaust flue of the boiler, the exhaust gas of the boiler passes through the outside of the heat exchange tube group and is exhausted through the exhaust port, the air sucked by the air blower flows into the air blower from the inside of the heat exchange tube group, and the air passing through the heat exchange tube group is heated in the process of exhausting the gas by the boiler, so that the temperature of the air entering a combustion chamber of the boiler is increased, the temperature of a furnace chamber is effectively increased, the fuel is saved, the energy is saved, the production cost is reduced for enterprises, the emission of pollutants is reduced, and the contribution to environmental protection is.

Preferably, the heat exchange tube set comprises a first heat exchange tube set and a second heat exchange tube set, the first heat exchange tube set is positioned at the top of the second heat exchange tube, one end of the first heat exchange tube set is communicated with the atmosphere, the other end of the first heat exchange tube set is communicated with the second heat exchange tube set, and the other end of the second heat exchange tube set is communicated with an air inlet pipe of the boiler blower.

The beneficial effects of adopting above-mentioned technical scheme are that, adopt two sets of heat transfer pipe sets, can absorb the heat of discharging fume more, increase heat exchange efficiency, further improve the temperature of boiler combustion chamber air, effectively improve the furnace hall temperature.

Preferably, mounting holes matched with the first heat exchange tube group and the second heat exchange tube group are formed in the two side walls of the box body; both ends of the first heat exchange pipe group and both ends of the second heat exchange pipe group are fixed at the corresponding mounting holes; and an air guide box is arranged on the outer side of one side wall of the box body, which is far away from the exhaust port, the air guide box is fixedly connected with the side wall of the box body in a sealing manner to form an inner cavity, and the inner cavity is communicated with the air inlet and the exhaust port.

The heat exchange tube has the advantages that the first heat exchange tube group and the second heat exchange tube group are fixed at the corresponding mounting holes, so that the appearance is attractive, and air can pass through the heat exchange tube to be separated from smoke exhaust; the air guiding box ensures that air smoothly enters the blower.

Preferably, the first heat exchange tube group and the second heat exchange tube group each include a plurality of heat exchange tubes arranged in parallel.

The beneficial effect of adopting above-mentioned technical scheme is, improves heat exchange efficiency.

Preferably, the air guide box and the side wall of the box body are welded, fixed and sealed.

Adopt above-mentioned technical scheme's beneficial effect is, welded fastening stable in structure, and sealed setting avoids outside air to get into second heat transfer tube group, guarantees heat exchange efficiency.

Preferably, both ends of the plurality of heat exchange tubes are welded to the side wall of the tank body.

Adopt above-mentioned technical scheme's beneficial effect is, stable in structure.

Preferably, a filter screen is installed at an air inlet of the heat exchange tube set.

Adopt above-mentioned technical scheme's beneficial effect is, the installation filter screen can filter the inspiratory air of air-blower, filters impurity such as flying cotton fibre in the air.

Preferably, the device is arranged on the discharge flue of the vertical boiler.

The beneficial effects of adopting above-mentioned technical scheme are that, do not occupy horizontal space, simple to operate, the transformation cost of boiler is low, and reduce cost effect is more obvious.

According to the technical scheme, compared with the prior art, the boiler preheating air inlet device utilizing the flue gas effectively improves the temperature of a furnace hearth, saves fuel and energy, and reduces the emission of pollutants.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic perspective view of a boiler preheating air intake device using flue gas according to the present invention.

FIG. 2 is a side view of a boiler according to the present invention, wherein the box of the air inlet device is not connected with an air inlet pipe.

Wherein, each figure is as follows:

1-a box body, 2-a heat exchange tube group, 21-a first heat exchange tube group, 22-a second heat exchange tube group, 3-a boiler blower, 4-an air inlet pipe and 5-an air flow guiding box; 6, a smoke exhaust pipe;

a-smoke outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The embodiment of the invention discloses a boiler air inlet preheating device by utilizing flue gas, which is arranged on a discharge flue of a boiler and comprises a box body 1 and a heat exchange tube group 2, wherein the top of the box body 1 is communicated with a smoke outlet, and the bottom end of the box body is communicated with a boiler smoke discharge tube 3; the box body 1 is provided with an inner cavity, the heat exchange tube group 2 is fixed inside the box body 1 and is provided with an air inlet and an air outlet, the air inlet is communicated with the atmosphere, and the air outlet is communicated with an air inlet pipe 4 of a boiler blower 3.

The boiler disclosed in the embodiment utilizes flue gas to preheat air inlet device, and is installed on the discharge flue of boiler, and the boiler discharges fume and passes through from the outside of heat exchange tube set 2, discharges through exhaust port A, and the air that air-blower 3 inhaled flows into air-blower 3 from the inside of heat exchange tube set 2, and the boiler heats the air that passes through from the heat exchange tube set 2 in discharging fume the in-process, thereby improved the temperature that gets into the boiler combustion chamber air, effectively improved the furnace hearth temperature, and the fuel is saved, not only the energy has been practiced thrift, and the emission of pollutant has still been reduced.

The heat exchange tube set 2 comprises a first heat exchange tube set 21 and a second heat exchange tube set 22, the first heat exchange tube set 21 is positioned at the top of the second heat exchange tube set 22, one end of the first heat exchange tube set 21 is communicated with the atmosphere, the other end of the first heat exchange tube set is communicated with the second heat exchange tube set 22, and the other end of the second heat exchange tube set 22 is communicated with an air inlet pipe 4 of the boiler blower 3. Mounting holes matched with the first heat exchange tube set 21 and the second heat exchange tube set 22 are formed in the two side walls of the box body 1; both ends of the first heat exchange tube group 21 and both ends of the second heat exchange tube group 22 are fixed at the corresponding mounting holes; and an air guide box 5 is arranged on the outer side of one side wall of the box body 1 far away from the exhaust port, the air guide box 5 is fixedly connected with the side wall of the box body 1 in a sealing manner to form an inner cavity, and the inner cavity is communicated with the air inlet and the exhaust port. The air guide box 5 is arranged to ensure that air smoothly enters the blower 3. The first heat exchange tube group 21 and the second heat exchange tube group 22 both comprise a plurality of heat exchange tubes arranged in parallel, so that the heat exchange efficiency is improved.

Adopt two sets of heat transfer pipe sets 2, can absorb the heat of discharging fume more, increase heat exchange efficiency, further improve the temperature of boiler combustion chamber air, effectively improve the furnace hearth temperature. The two ends of the first heat exchange tube set 21 and the second heat exchange tube set 22 are fixed at the corresponding mounting holes, so that the appearance is attractive, the air can pass through the inside of the heat exchange tube, and the smoke passes through the outside of the heat exchange tube, so that the separation of air intake and smoke exhaust is realized.

More advantageously, the air guide box 5 is welded, fixed and sealed with the side wall of the box body 1. Both ends of a plurality of heat exchange tubes are welded on the side wall of the box body 1. And the structure is more stable due to the welding connection mode.

The filter screen is installed to the air inlet department of heat exchange tube group 2, can filter the air that air-blower 3 inhaled, filters impurity such as flying cotton fibre in the air, improves the cleanliness of inlet air.

The boiler disclosed by the invention utilizes the working principle of the smoke preheating air inlet device that the smoke discharged by the boiler is discharged from a smoke discharge pipe of the boiler, enters the inner cavity of the box body from the bottom end of the box body, passes through the gap between the heat exchange pipes in the inner cavity and flows to the top end, and is discharged through a smoke outlet; meanwhile, the blower works, air enters the plurality of heat exchange tubes from the air inlet of the first heat exchange tube set 21, enters the second heat exchange tube set 22 through the air flow guiding box 5, enters the blower and further enters the hearth of the boiler; when air flows through the inside of the heat exchange tube, the smoke is discharged from the outside of the heat exchange tube, and the air absorbs the heat of the smoke so as to increase the temperature, so that the air entering the boiler is heated air, the temperature of a furnace hearth is increased, the fuel is saved by more than 5 percent, the equivalent thermal efficiency is achieved, the energy is saved, the production cost of enterprises is reduced, and the emission of pollutants is reduced; meanwhile, the temperature of the discharged flue gas is reduced, the climate warming is slowed down, and the method contributes to the environmental protection in many ways.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A boiler preheats the air inlet unit with the flue gas, mount on the discharge flue of the boiler, characterized by, including container body (1) and heat exchange tube group (2), the top of the said container body (1) communicates with exhaust port, the bottom communicates with smoke exhaust pipe (6) of the boiler; the box body (1) is provided with an inner cavity, the heat exchange tube set (2) is fixed inside the box body (1) and is provided with an air inlet and an air outlet, the air inlet is communicated with the atmosphere, and the air outlet is communicated with an air inlet pipe (4) of a boiler blower (3).

2. A boiler air intake preheating device using flue gas according to claim 1, wherein the heat exchange tube set (2) comprises a first heat exchange tube set (21) and a second heat exchange tube set (22), the first heat exchange tube set (21) is located on top of the second heat exchange tube set (22), an air inlet of the first heat exchange tube set (21) is communicated with the atmosphere, the other end of the first heat exchange tube set is communicated with the second heat exchange tube set (22), and an air outlet of the second heat exchange tube set (22) is communicated with an air inlet pipe (4) of the boiler blower (3).

3. The boiler preheats the air intake device by using the flue gas according to claim 2, characterized in that both side walls of the box body (1) are provided with mounting holes adapted to the first heat exchange tube set (21) and the second heat exchange tube set (22); both ends of the first heat exchange pipe group (21) and both ends of the second heat exchange pipe group (22) are fixed at the corresponding mounting holes; and an air guide box (5) is installed on the outer side of one side wall of the box body (1) far away from the exhaust port, the air guide box (5) is fixedly connected with the side wall of the box body (1) in a sealing mode to form an inner cavity, and the inner cavity is communicated with the air inlet and the exhaust port.

4. A boiler air intake device utilizing flue gas preheating according to claim 3, characterized in that the first heat exchange tube set (21) and the second heat exchange tube set (22) each comprise a plurality of heat exchange tubes arranged in parallel.

5. The boiler air intake device utilizing flue gas preheating according to claim 3, wherein the air guide box (5) is welded, fixed and sealed with the side wall of the box body (1).

6. The boiler air intake preheating device by using flue gas as claimed in claim 4, wherein both ends of the plurality of heat exchange tubes are welded on the side wall of the box body (1).

7. A boiler air intake preheating device by using flue gas according to any one of claims 1 to 6, characterized in that a filter screen is installed at the air inlet of the heat exchange tube set (2).