CN210088911U

CN210088911U - Device for preheating air by using boiler flue gas

Info

Publication number: CN210088911U
Application number: CN201920819823.5U
Authority: CN
Inventors: 王云翔; 栾林昆
Original assignee: Qujing Xiangteng Building Materials Co Ltd
Current assignee: Qujing Xiangteng Building Materials Co Ltd
Priority date: 2019-06-02
Filing date: 2019-06-02
Publication date: 2020-02-18
Anticipated expiration: 2029-06-02

Abstract

The utility model discloses an utilize device of boiler flue gas preheated air, including setting up exhanst gas outlet and the air intlet at boiler top and middle part respectively, exhanst gas outlet passes through flue gas pipe connection air heater, air heater includes the left head and the right head of the heat exchanger body at middle part and both sides, both ends are provided with left end plate and right end plate about the heat exchanger body, this internal left side that runs through of heat exchanger, right-hand member board axial parallel arrangement has a plurality of heat exchange tubes, the upper portion that the heat exchanger body is close to right head one side is provided with cold air inlet, the lower part that is close to left head one side is provided with hot air outlet, hot air outlet passes through the air intlet on the hot air pipe connection boiler, this internal crisscross interval of heat exchanger is provided with first baffling. The utility model provides a can utilize flue gas heat energy effectively, improve combustion efficiency, reduce the boiler energy consumption, reduction in production cost improves enterprise economic benefits's the device that utilizes boiler flue gas preheated air.

Description

Device for preheating air by using boiler flue gas

Technical Field

The utility model relates to an evaporate and press the energy-conserving technical field of air entrainment piece production facility, specifically be an utilize device of boiler flue gas preheated air.

Background

The procedures of static stop initial curing, autoclaved curing and the like in the autoclaved aerated block production process are carried out by using steam, and a boiler is a main device for providing the steam and is one of the devices with the largest energy consumption in the autoclaved aerated block production process, so that the reduction of the energy consumption of the boiler is a main way for reducing the production cost of the autoclaved aerated block. In the prior art, combustion-supporting air of a boiler directly absorbs external cold air, the cold air is not beneficial to combustion, certain heat energy is consumed, especially when low-calorific-value fuel is used, the boiler temperature cannot meet the use requirement, the energy-saving effect cannot be achieved, the boiler flue gas contains a large amount of heat energy, for the heat energy, if the heat energy is not utilized, a large amount of waste is caused, and the heat in the boiler flue gas can cause heat pollution to the air. Therefore, it is necessary to develop a device for preheating air by using boiler flue gas, which can effectively utilize the heat energy of flue gas, improve the combustion heat efficiency, reduce the energy consumption of the boiler, reduce the production cost and improve the economic benefits of enterprises.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can utilize flue gas heat energy effectively, improve the thermal efficiency that burns, reduce the boiler energy consumption, reduction in production cost improves enterprise economic benefits's the device of utilizing boiler flue gas preheated air.

In order to achieve the above object, the utility model provides a following technical scheme: a device for preheating air by using boiler flue gas comprises a flue gas outlet and an air inlet which are respectively arranged at the top and the middle of a boiler, the flue gas outlet is connected with the air preheater through a flue gas pipeline, the air preheater comprises a heat exchanger body at the middle, a left end plate and a right end plate which are connected through flanges at the left side and the right side, a left end plate and a right end plate are respectively arranged at the left side and the right side of the heat exchanger body, the upper parts of the left end plate and the right end plate are respectively provided with the flue gas inlet and a waste gas outlet, an inclined baffle is arranged between the left end plate and the flue gas inlet, a plurality of heat exchange tubes are axially and parallelly arranged in the heat exchanger body and penetrate through the left end plate and the right end plate to be respectively communicated with the left end plate and the right end plate, the flue gas inlet is, the lower part of one side close to the left end socket is provided with a hot air outlet, the hot air outlet is connected with an air inlet on the boiler through a hot air pipeline, a hot air branch pipe is arranged on the hot air pipeline, and the other end of the hot air branch pipe is connected with the left end socket; the cold air inlet is connected with the air blower through a cold air pipeline, a first baffle plate and a second baffle plate are arranged in the heat exchanger body at staggered intervals, a gap for air circulation is formed between the top of the first baffle plate and the inner wall of the heat exchanger body, and a gap for air circulation is formed between the bottom of the second baffle plate and the inner wall of the heat exchanger body.

Furthermore, the heat exchanger body, the left end socket, the right end socket, the flue gas pipeline, the hot air pipeline and the hot air branch pipe are all provided with heat preservation layers.

Furthermore, the bottom of the left end socket is provided with an ash discharge pipe, and a star-shaped ash discharge valve is mounted on the ash discharge pipe.

Furthermore, a short pipe is arranged at the bottom of the right end enclosure, and a pressure release valve is arranged on the short pipe.

Further, the waste gas outlet is connected with a dust removal device.

Further, the air preheater is obliquely arranged on the foundation through a support at the bottom, and the inclination angle is 3-6 degrees upwards from the left end socket to the right end socket.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model has the advantages that the air preheater is arranged, the high-temperature boiler flue gas and the cold air blown into the boiler for combustion supporting are subjected to heat exchange, the flue gas waste heat is effectively utilized, the air temperature entering the boiler furnace is increased, the heat efficiency is improved, the fire coal is saved, and the production cost is reduced; meanwhile, the utility model adds a left end socket at the front end of the heat exchanger body, and sets an inclined baffle between the left end plate and the flue gas inlet, after the dust-containing flue gas entering the left end socket collides with the inclined baffle, the direction of the air flow is changed, so that dust-containing particles collide with each other, are gathered and settled down, large granular impurities entering the heat exchanger body can be preliminarily reduced, and the pollution of the equipment by the large granular impurities is avoided; in addition, the hot air branch pipe is arranged on the left end socket of the utility model, which can support combustion of the flue gas entering the left end socket, so that the CO which does not burn completely comes out from the boiler is combusted again, thereby improving the temperature of the flue gas, being more beneficial to the heat exchange between the cold air and the flue gas and further improving the temperature of the cold air; the first baffle plate and the second baffle plate are designed in a staggered and spaced mode, so that the flow direction of air can be changed, the retention time of the air in the heat exchanger body is prolonged, and the heat exchange efficiency is further improved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a cross-sectional view taken along line B-B of fig. 1.

In the figure: 1-boiler, 11-air inlet, 12-flue gas outlet, 13-flue gas pipeline, 2-air preheater, 21-left end socket, 22-flue gas inlet, 23-left end plate, 24-heat exchange pipe, 25-first baffle plate, 26-second baffle plate, 27-cold air inlet, 28-waste gas outlet, 29-right end plate, 210-right end socket, 211-hot air outlet, 212-hot air pipeline, 213-short pipe, 214-support, 215-heat exchanger body, 216-pressure relief valve, 217-ash discharge pipe, 218-star-shaped ash discharge valve, 219-hot air branch pipe, 220-inclined baffle plate, 3-blower and 31-cold air pipeline.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a device for preheating air by using boiler flue gas comprises a flue gas outlet 12 and an air inlet 11 which are respectively arranged at the top and the middle of a boiler 1, wherein the flue gas outlet 12 is connected with the air preheater 2 through a flue gas pipeline 13, the air preheater 2 comprises a heat exchanger body 215 at the middle and a left end enclosure 21 and a right end enclosure 210 of which the left side and the right side are connected through flanges, a left end plate 23 and a right end plate 29 are respectively arranged at the left end and the right end of the heat exchanger body 215, a flue gas inlet 22 and a waste gas outlet 28 are respectively arranged at the upper parts of the left end enclosure 21 and the right end enclosure 210, an inclined baffle 220 is arranged between the left end plate 23 and the flue gas inlet 22, a plurality of heat exchange tubes 24 are axially arranged in parallel in the heat exchanger body 215 and penetrate through the left end plate 23 and the right end plate 29, the two ends of the heat exchange tubes 24 penetrate through the left, a cold air inlet 27 is arranged at the upper part of one side of the heat exchanger body 215 close to the right end enclosure 210, a hot air outlet 211 is arranged at the lower part of one side close to the left end enclosure 21, the hot air outlet 211 is connected with an air inlet 11 on the boiler 1 through a hot air pipeline 212, a hot air branch pipe 219 is arranged on the hot air pipeline 212, and the other end of the hot air branch pipe 219 is connected with the left end enclosure 21; the cold air inlet 27 is connected with the blower 3 through a cold air pipeline 31, the first baffle plate 25 and the second baffle plate 26 are arranged in the heat exchanger body 215 at intervals in a staggered mode, a gap for air circulation is formed between the top of the first baffle plate 25 and the inner wall of the heat exchanger body 215, and a gap for air circulation is formed between the bottom of the second baffle plate 26 and the inner wall of the heat exchanger body 215.

And heat insulation layers are arranged outside the heat exchanger body 215, the left end socket 21, the right end socket 210, the flue gas pipeline 13, the hot air pipeline 212 and the hot air branch pipe 219. The heat preservation can avoid calorific loss effectively, improves the heat transfer effect, increases the temperature of cold air.

The bottom of the left end enclosure 21 is provided with an ash discharge pipe 217, and a star-shaped ash discharge valve 218 is arranged on the ash discharge pipe 217. The settled dust can be discharged by periodically opening the star-type dust discharge valve 218.

The bottom of the right end socket 210 is provided with a short pipe 213, and the short pipe 213 is provided with a pressure relief valve 216. The pressure relief valve 216 can adjust the pressure of the air preheater 2, and safe production is guaranteed.

The waste gas outlet 28 is connected with a dust removal device, and waste gas is discharged after further dust removal through the dust removal device, so that the waste gas is prevented from polluting the environment.

The air preheater 2 is obliquely arranged on the foundation through a support 214 at the bottom, and the inclination angle is 3-6 degrees from the left end socket 21 to the right end socket 210. The inclined arrangement of the air preheater 2 facilitates the deposition of ash inside the heat exchange tube 24 to the ash discharge tube 217 for discharge.

The working principle is as follows: the utility model has the advantages that the air preheater 2 is arranged, the high-temperature furnace flue gas and the cold air blown into the boiler 1 for combustion supporting are subjected to heat exchange, the flue gas waste heat is effectively utilized, the air temperature entering the boiler 1 furnace is increased, the heat efficiency is improved, the fire coal is saved, and the production cost is reduced; meanwhile, the utility model adds the left end socket 21 at the front end of the heat exchanger body 215, and sets the inclined baffle 220 between the left end plate 23 and the flue gas inlet 22, after the dust-containing flue gas entering the left end socket 21 collides with the inclined baffle 220, the direction of the air flow is changed, so that the dust-containing particles collide with each other, are gathered and settled, large granular impurities entering the heat exchanger body 215 can be reduced preliminarily, and the pollution of the equipment by the large granular impurities is avoided; in addition, the utility model arranges the hot air branch pipe 219 on the left end socket 21, and partial hot air is blown into the left end socket 21, so as to support combustion of the flue gas entering the left end socket 21, and the unburned CO is combusted again from the boiler 1, thereby improving the temperature of the flue gas, facilitating the heat exchange between the cold air and the flue gas, and further improving the temperature of the cold air; the first baffle plate 25 and the second baffle plate 26 are alternately arranged to change the flow direction of the air, so as to increase the residence time of the air in the heat exchanger body 215, and further increase the heat exchange efficiency.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an utilize device of boiler flue gas preheated air, includes flue gas outlet (12) and air inlet (11) that set up respectively at boiler (1) top and middle part, its characterized in that: the flue gas outlet (12) is connected with the air preheater (2) through a flue gas pipeline (13), the air preheater (2) comprises a heat exchanger body (215) in the middle, a left seal head (21) and a right seal head (210) which are connected through flanges on the left side and the right side, a left end plate (23) and a right end plate (29) are respectively arranged at the left end and the right end of the heat exchanger body (215), a flue gas inlet (22) and a waste gas outlet (28) are respectively arranged at the upper parts of the left seal head (21) and the right seal head (210), an inclined baffle (220) is arranged between the left end plate (23) and the flue gas inlet (22), a plurality of heat exchange tubes (24) are axially arranged in parallel in the heat exchanger body (215) and penetrate through the left end plate (23) and the right end plate (29) and are respectively communicated with the left seal head (21) and the right seal head (210), the flue gas inlet (22) is connected with the flue gas outlet (12), a cold air inlet (27) is formed in the upper portion of one side, close to the right seal head (210), of the heat exchanger body (215), a hot air outlet (211) is formed in the lower portion of one side, close to the left seal head (21), of the heat exchanger body, the hot air outlet (211) is connected with an air inlet (11) in the boiler (1) through a hot air pipeline (212), a hot air branch pipe (219) is arranged on the hot air pipeline (212), and the other end of the hot air branch pipe (219) is connected with the left seal head (21); the cold air inlet (27) is connected with the air blower (3) through a cold air pipeline (31), a first baffle plate (25) and a second baffle plate (26) are arranged in the heat exchanger body (215) at intervals in a staggered mode, a gap for air circulation is formed between the top of the first baffle plate (25) and the inner wall of the heat exchanger body (215), and a gap for air circulation is formed between the bottom of the second baffle plate (26) and the inner wall of the heat exchanger body (215).

2. The apparatus for preheating air using boiler flue gas according to claim 1, wherein: and heat insulation layers are arranged outside the heat exchanger body (215), the left sealing head (21), the right sealing head (210), the flue gas pipeline (13), the hot air pipeline (212) and the hot air branch pipe (219).

3. The apparatus for preheating air using boiler flue gas according to claim 1, wherein: the bottom of the left sealing head (21) is provided with an ash discharge pipe (217), and the ash discharge pipe (217) is provided with a star-shaped ash discharge valve (218).

4. The apparatus for preheating air using boiler flue gas according to claim 1, wherein: the bottom of the right end enclosure (210) is provided with a short pipe (213), and the short pipe (213) is provided with a pressure release valve (216).

5. The apparatus for preheating air using boiler flue gas according to claim 1, wherein: the waste gas outlet (28) is connected with a dust removal device.

6. The apparatus for preheating air using boiler flue gas according to claim 1, wherein: the air preheater (2) is obliquely arranged on a foundation base through a support (214) at the bottom, and the inclination angle is 3-6 degrees upwards from the left end socket (21) to the right end socket (210).