Low-nitrogen hot dirty tail gas hot blast stove

Abstract

The utility model relates to the technical field of hot blast stoves, and provides a low-nitrogen hot dirty tail gas hot blast stove which comprises a stove front wall, an explosion venting valve, a first temperature and pressure measuring point, a stove barrel, a secondary combustion mechanism and a support, the stove front wall, the stove barrel and the secondary combustion mechanism are all fixedly installed on the support, and the explosion venting valve and the first temperature and pressure measuring point are both fixedly installed on the stove barrel. By means of the obliquely-arranged burner installation hole, tar, water and the like flow out of the burner, when passing through the injection hole, high-speed gas introduced from the injection hole blows the tar flowing into the furnace back to the position close to flames, the tar is combusted again, part of water is vaporized, and residual water is discharged through the drain outlet; then the flame condition in the furnace is observed through a plurality of front wall observation holes formed in the wall body, a flame detector is installed, then temperature adjusting air is introduced through a temperature adjusting air inlet, and the temperature adjusting air is distributed, rectified, sprayed out and blown to the inner wall of the furnace barrel body through a temperature adjusting air annular channel, so that the temperature of a hearth can be adjusted, and the furnace barrel body can be cooled.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast furnaces, in particular to a low-nitrogen hot dirty tail gas hot blast furnace. Background Art

[0002] In the process of making carbonized particles or activated carbon from biomass materials, high-temperature combustible gas is produced, which is hot dirty biomass gas. This gas contains a large amount of impurities such as dust, tar, water, etc. For the initial hot dirty biomass gas, the current common application method is to condense and remove dust to separate water, tar, wood vinegar, dust and other impurities to obtain clean biomass gas that can be used for combustion.

[0003] The temperature of the initially generated biomass gas is relatively high, reaching over 200°C, and contains a large amount of sensible heat. During the hot dirty biomass gas purification process, the biomass gas temperature drops to room temperature, which greatly wastes heat. At the same time, the purification device is complex, and the equipment investment and operating costs are high.

[0004] When directly using hot dirty biomass gas to burn in a hot blast furnace, problems such as water and tar accumulation in the combustion furnace, incomplete combustion, and poor quality of hot flue gas are likely to occur. Utility Model Content

[0005] The utility model provides a low-nitrogen hot dirty tail gas hot blast furnace, which solves the problems in the related art of easy accumulation of water and tar in the combustion furnace, incomplete combustion and poor quality of hot flue gas.

[0006] The technical solution of the utility model is as follows: a low-nitrogen hot dirty tail gas hot blast furnace, comprising: a furnace front wall, an explosion relief valve, a first temperature and pressure measuring point, a furnace body, a secondary combustion mechanism and a bracket, wherein the furnace front wall, the furnace body and the secondary combustion mechanism are all fixedly mounted on the bracket, and the explosion relief valve and the first temperature and pressure measuring point are all fixedly mounted on the furnace body;

[0007] The front wall of the furnace includes a temperature-regulating air annular channel, a temperature-regulating air inlet, a plurality of temperature-regulating air nozzles, a front wall observation hole, a burner mounting hole, a blowing hole and a wall, and the wall is installed in front of the furnace body, the temperature-regulating air annular channel is installed on the wall, the temperature-regulating air inlet is arranged on the temperature-regulating air annular channel, a plurality of temperature-regulating air nozzles are arranged in a circular array on the wall in sequence, and the temperature-regulating air nozzles are connected with the temperature-regulating air inlet through the temperature-regulating air annular channel, the temperature-regulating air nozzles are at a certain angle to the center line of the furnace body toward the inner side wall of the furnace body, the front wall observation hole, the burner mounting hole and the blowing hole are all arranged on the wall, and a plurality of front wall observation holes can be provided, arranged at different angles, the opening of the burner mounting hole is inclined downward, and the blowing hole is opened on the wall.

[0008] Preferably, the furnace barrel body includes a furnace barrel body, a furnace barrel body observation hole, a reserved ammonia injection sleeve and a sewage outlet, and the furnace barrel body is installed on the bracket, the furnace barrel body observation hole is opened on the furnace barrel body, and the opening is inclined and faces the burner installation hole, the reserved ammonia injection sleeve is installed in the middle position of the furnace barrel body, the sewage outlet is opened at the bottom of the furnace barrel body, and the tail of the furnace barrel body is connected to the secondary combustion mechanism after the diameter is reduced.

[0009] Preferably, the secondary combustion mechanism includes a secondary combustion chamber, a plurality of secondary air nozzles, a secondary air annular channel, a secondary air inlet and a hot flue gas outlet, and the front end of the secondary combustion chamber is connected to the furnace body at a reduced diameter, and the plurality of secondary air nozzles are arranged in a circular array in sequence at the expanded diameter of the secondary combustion chamber, and the opening direction is biased toward the hot flue gas outlet and the center line of the furnace body, the secondary air annular channel is installed on the secondary combustion chamber, and the secondary air inlet is opened on the secondary air annular channel.

[0010] Preferably, a second temperature and pressure measuring point is installed on the secondary combustion chamber.

[0011] Preferably, a plurality of L-shaped cylinders are fixedly mounted on the outer side wall of the secondary air annular channel, and the secondary air inlet is located on the inner side of the L-shaped cylinder, and a plurality of filter screens are fixedly mounted on the inner side wall of the L-shaped cylinder.

[0012] Preferably, the furnace front wall, the furnace body and the secondary combustion mechanism are all made of steel plates.

[0013] Preferably, the furnace front wall, the furnace body and the interior of the secondary combustion mechanism are respectively cast with refractory castables and heat insulating materials, and the heat insulating material is located on the inner side of the refractory castables.

[0014] The working principle and beneficial effects of the utility model are:

[0015] Through the inclined burner installation hole, tar, water, etc. flow out of the burner. When passing through the injection hole, the high-speed gas introduced from the injection hole blows the tar flowing into the furnace back to the vicinity of the flame, burns the tar again, vaporizes part of the water, and the remaining water is discharged through the sewage outlet. Then, the flame condition in the furnace is observed and flame detection is installed through a plurality of front wall observation holes arranged on the wall, and then the temperature-adjusting air is introduced through the temperature-adjusting air inlet, and passes through the temperature-adjusting air annular channel, so that the temperature-adjusting air is distributed and rectified before being ejected and blown to the inner wall of the furnace barrel, thereby adjusting the furnace temperature and cooling the furnace barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0017] Figure 1It is a schematic diagram of the overall structure proposed by the utility model;

[0018] Figure 2 The utility model provides a three-dimensional structural schematic diagram of the secondary combustion mechanism.

[0019] In the figure: 1, furnace front wall; 1-1, temperature-adjusting air annular channel; 1-2, temperature-adjusting air inlet; 1-3, temperature-adjusting air nozzle; 1-4, front wall observation hole; 1-5, burner installation hole; 1-6, injection hole; 1-7, wall;

[0020] Explosion relief valve; 3. The first temperature and pressure measuring point;

[0021] 4. Furnace body; 4-1. Furnace body; 4-2. Furnace observation hole; 4-3. Reserved ammonia injection sleeve; 4-4. Sewage outlet;

[0022] 5. Secondary combustion mechanism; 5-1. Secondary combustion chamber; 5-2. Secondary air nozzle; 5-3. Secondary air annular channel; 5-4. Secondary air inlet; 5-5. Hot flue gas outlet;

[0023] 6. Bracket; 7. Second temperature and pressure measuring point; 8. Refractory casting material; 9. Thermal insulation material; 10. L-shaped cylinder; 11. Filter screen. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1 - Figure 2 , a low-nitrogen hot dirty tail gas hot blast furnace, comprising: a furnace front wall 1, an explosion relief valve 2, a first temperature and pressure measuring point 3, a furnace barrel 4, a secondary combustion mechanism 5 and a bracket 6, wherein the furnace front wall 1, the furnace barrel 4 and the secondary combustion mechanism 5 are all fixedly mounted on the bracket 6, and the explosion relief valve 2 and the first temperature and pressure measuring point 3 are all fixedly mounted on the furnace barrel 4;

[0026] The furnace front wall 1, the furnace barrel 4 and the secondary combustion mechanism 5 are all made of steel plates, and the interiors of the furnace front wall 1, the furnace barrel 4 and the secondary combustion mechanism 5 are respectively poured with refractory casting materials 8 and heat insulation materials 9, and the heat insulation materials 9 are located on the inner side of the refractory casting materials 8;

[0027] The furnace front wall 1 includes a temperature-adjusting air annular channel 1-1, a temperature-adjusting air inlet 1-2, a plurality of temperature-adjusting air nozzles 1-3, a front wall observation hole 1-4, a burner installation hole 1-5, a spray hole 1-6 and a wall 1-7, and the wall 1-7 is installed in front of the furnace barrel 4, the temperature-adjusting air annular channel 1-1 is installed on the wall 1-7, the temperature-adjusting air inlet 1-2 is opened on the temperature-adjusting air annular channel 1-1, and a plurality of temperature-adjusting air nozzles 1-3 are opened in a circular array on the wall 1-7 in sequence. The temperature-adjusting air nozzle 1-3 is connected with the temperature-adjusting air inlet 1-2 through the temperature-adjusting air annular channel 1-1. The temperature-adjusting air nozzle 1-3 is directed toward the inner wall of the furnace body 4 at a certain angle to the center line of the furnace body. The front wall observation hole 1-4, the burner installation hole 1-5 and the injection hole 1-6 are all opened on the wall 1-7. A plurality of front wall observation holes 1-4 can be provided, arranged at different angles. The opening of the burner installation hole 1-5 is inclined downward, and the injection hole 1-6 is opened on the wall 1-7.

[0028] The low-nitrogen hot dirty tail gas hot blast furnace provided by the utility model allows tar, water, etc. to flow out of the burner through the inclined burner installation hole 1-5, and then through the blowing hole 1-6, high-speed gas can be introduced and blow the tar flowing into the furnace back to the vicinity of the flame to burn the tar again, and then through the multiple front wall observation holes 1-4 arranged on the wall 1-7, the combustion condition in the furnace can be observed, and at the same time, through the first temperature and pressure measuring point 3, the combustion operation condition can be detected, so as to facilitate the subsequent adjustment of the combustion parameters. When an explosion combustion accident occurs, the explosion relief valve 2 is opened to automatically release the pressure, thereby releasing the explosion pressure and ensuring the safety of the equipment, and then the temperature regulating air is introduced through the temperature regulating air inlet 1-2, and through the temperature regulating air annular channel 1-1, the temperature regulating air is distributed and rectified at 103 and sprayed to the inner wall of the furnace barrel 4, thereby adjusting the furnace temperature and cooling the furnace barrel.

[0029] It should also be noted that a hot dirty biomass gas burner is installed in the burner installation hole 1-5.

[0030] Furthermore, the furnace barrel body 4 includes a furnace barrel body 4-1, a furnace barrel body observation hole 4-2, a reserved ammonia injection sleeve 4-3 and a sewage outlet 4-4, and the furnace barrel body 4-1 is installed on the bracket 6, the furnace barrel body observation hole 4-2 is opened on the furnace barrel body 4-1, and the opening is inclined and faces the burner installation hole 1-5, the reserved ammonia injection sleeve 4-3 is installed in the middle section of the furnace barrel body 4-1, the sewage outlet 4-4 is opened at the bottom of the furnace barrel body 4-1, and the furnace barrel body 4-1 is connected to the secondary combustion mechanism 5 after the tail end is reduced in diameter.

[0031] Specifically, the residual liquid in the furnace can be discharged through the sewage outlet 4-4, and then the furnace conditions can be observed through the furnace body observation hole 4-2. At the same time, when the fuel-type nitrogen oxides are high, a spray gun can be inserted through the reserved ammonia injection sleeve 4-3 to spray ammonia water for denitrification in the furnace.

[0032] Furthermore, the secondary combustion mechanism 5 includes a secondary combustion chamber 5-1, a plurality of secondary air nozzles 5-2, a secondary air annular channel 5-3, a secondary air inlet 5-4 and a hot flue gas outlet 5-5, and the front end of the secondary combustion chamber 5-1 is connected to the furnace body 4-1 at a reduced diameter, and a plurality of secondary air nozzles 5-2 are sequentially opened in a circular array at the expanded diameter of the secondary combustion chamber 5-1, and the opening direction is biased toward the hot flue gas outlet 5-5 and the center line of the furnace body, the secondary air annular channel 5-3 is installed on the secondary combustion chamber 5-1, and the secondary air inlet 5-4 is opened on the secondary air annular channel 5-3.

[0033] Specifically, when the high-temperature flue gas passes through the furnace body 4 and enters the secondary combustion mechanism 5, natural air enters the secondary air annular channel 5-3 from the secondary air inlet 5-4, and then is ejected from the secondary air nozzle 5-2, thereby promoting uniform mixing of the secondary air and the high-temperature flue gas. Incomplete combustion products formed in the high-temperature flue gas due to lack of oxygen combustion react with the oxygen in the secondary air for oxidation, and the flue gas after the combustion reaction is completed is discharged from the hot flue gas outlet 5-5, so that it can be used by equipment that uses the hot flue gas later.

[0034] Furthermore, a plurality of L-shaped cylinders 10 are fixedly mounted on the outer wall of the secondary air annular channel 5 - 3 , and the secondary air inlet 5 - 4 is located on the inner side of the L-shaped cylinder 10 , and a plurality of filter screens 11 are fixedly mounted on the inner wall of the L-shaped cylinder 10 .

[0035] Specifically, through the L-shaped tube 10 and with the cooperation of multiple filter nets 11, the air entering the secondary air annular channel 5-3 can be filtered, thereby avoiding the accumulation of a large amount of dust and impurities in the furnace body 4 and the secondary combustion mechanism 5 after long-term use. At the same time, the air discharged from the secondary air annular channel 5-3 can also be filtered to avoid pollution to the surrounding air.

[0036] Furthermore, a second temperature and pressure measuring point 7 is installed on the secondary combustion chamber 5 - 1 .

[0037] Specifically, the smoke exhaust state can be detected through the second temperature and pressure measuring point 7 .

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Low nitrogen hot dirty tail gas hot blast furnace, characterized in that: include: A furnace front wall (1), an explosion relief valve (2), a first temperature and pressure measuring point (3), a furnace barrel (4), a secondary combustion mechanism (5) and a bracket (6), wherein the furnace front wall (1), the furnace barrel (4) and the secondary combustion mechanism (5) are all fixedly mounted on the bracket (6), and the explosion relief valve (2) and the first temperature and pressure measuring point (3) are all fixedly mounted on the furnace barrel (4); The furnace front wall (1) comprises a temperature-adjusting air annular channel (1-1), a temperature-adjusting air inlet (1-2), a plurality of temperature-adjusting air nozzles (1-3), a front wall observation hole (1-4), a burner installation hole (1-5), a spray hole (1-6) and a wall (1-7), wherein the wall (1-7) is installed in front of the furnace barrel (4), the temperature-adjusting air annular channel (1-1) is installed on the wall (1-7), the temperature-adjusting air inlet (1-2) is arranged on the temperature-adjusting air annular channel (1-1), and the plurality of temperature-adjusting air nozzles (1-3) are arranged in a circular array in sequence on the wall (1-7). The temperature-adjusting air nozzle (1-3) is connected to the temperature-adjusting air inlet (1-2) through the temperature-adjusting air annular channel (1-1); the temperature-adjusting air nozzle (1-3) is directed toward the inner wall of the furnace barrel (4) at a certain angle to the center line of the furnace body; the front wall observation hole (1-4), the burner installation hole (1-5) and the injection hole (1-6) are all opened on the wall (1-7); a plurality of front wall observation holes (1-4) can be provided and arranged at different angles; the opening of the burner installation hole (1-5) is inclined downward; and the injection hole (1-6) is opened on the wall (1-7).

2. The low nitrogen hot dirty tail gas hot blast furnace according to claim 1, characterized in that: The furnace barrel body (4) comprises a furnace barrel body (4-1), a furnace barrel body observation hole (4-2), a reserved ammonia injection sleeve (4-3) and a sewage outlet (4-4), and the furnace barrel body (4-1) is mounted on the bracket (6), the furnace barrel body observation hole (4-2) is provided on the furnace barrel body (4-1), and the opening is inclined and faces the burner installation hole (1-5), the reserved ammonia injection sleeve (4-3) is installed at the middle section of the furnace barrel body (4-1), the sewage outlet (4-4) is provided at the bottom of the furnace barrel body (4-1), and the furnace barrel body (4-1) is connected to the secondary combustion mechanism (5) after the tail portion is reduced in diameter.

3. The low nitrogen hot dirty tail gas hot blast furnace according to claim 2, characterized in that: The secondary combustion mechanism (5) comprises a secondary combustion chamber (5-1), a plurality of secondary air nozzles (5-2), a secondary air annular channel (5-3), a secondary air inlet (5-4) and a hot flue gas outlet (5-5); the front end of the secondary combustion chamber (5-1) is connected to the furnace body (4-1) at a reduced diameter; the plurality of secondary air nozzles (5-2) are sequentially arranged in a circular array at the expanded diameter of the secondary combustion chamber (5-1), and the opening direction is biased towards the hot flue gas outlet (5-5) and the center line of the furnace body; the secondary air annular channel (5-3) is installed on the secondary combustion chamber (5-1); and the secondary air inlet (5-4) is arranged on the secondary air annular channel (5-3).

4. The low nitrogen hot dirty tail gas hot blast furnace according to claim 3, characterized in that: A second temperature and pressure measuring point (7) is installed on the secondary combustion chamber (5-1).

5. The low nitrogen hot dirty tail gas hot blast furnace according to claim 3, characterized in that: A plurality of L-shaped cylinders (10) are fixedly mounted on the outer side wall of the secondary air annular channel (5-3), the secondary air inlet (5-4) is located on the inner side of the L-shaped cylinder (10), and a plurality of filter screens (11) are fixedly mounted on the inner side wall of the L-shaped cylinder (10).

6. The low nitrogen hot dirty tail gas hot blast furnace according to claim 1, characterized in that: The furnace front wall (1), the furnace barrel (4) and the secondary combustion mechanism (5) are all made of steel plates.

7. The low nitrogen hot dirty tail gas hot blast furnace according to claim 1, characterized in that: Refractory casting material (8) and heat insulating material (9) are respectively cast inside the furnace front wall (1), the furnace barrel (4) and the secondary combustion mechanism (5), and the heat insulating material (9) is located on the inner side of the refractory casting material (8).

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