Straight-through type tunnel kiln

Abstract

The utility model discloses a straight-through type tunnel kiln which comprises a first lifting track frame, a preheating tunnel kiln, a main firing tunnel kiln, a low-nitrogen combustion device, a cooling tunnel kiln, a second lifting track frame and a controller. The first lifting track frame and the second lifting track frame are the same in structure. The first lifting track frame, the preheating tunnel kiln, the main firing tunnel kiln, the cooling tunnel kiln and the second lifting track frame are connected in sequence; the low-nitrogen combustion device is arranged on the main firing tunnel kiln; the low-nitrogen combustion device comprises a combustible supply pipe, a combustion improver supply pipe, a gas mixer and a circulating combustor; the other end of the combustible agent supply pipe and the other end of the combustion improver supply pipe are hermetically connected with the upper end of the gas mixer; the lower end of the gas mixer is hermetically connected with the circulating combustor; and the gas mixer and the circulating combustor can guide suspended matters in the kiln to be fully mixed and combusted. The straight-through tunnel kiln solves the problems that the emission amount of NOx of a straight-through kiln is large, and fired articles are inconvenient to transport.

Description

Technical Field

[0001] The utility model belongs to the technical field of kiln equipment, and particularly relates to a straight-through tunnel kiln. Background Art

[0002] In modern tunnel kilns such as boilers, decomposition furnaces, heating furnaces, and rotary kilns, NOx is generated in existing straight-through tunnel kilns. Especially in rail straight-through tunnel kilns, the emission control indexes of NOx during the combustion process of the kiln are becoming more and more strict. The industry mainly adopts technical measures of staged combustion to reduce the generation of NOx; thus affecting the combustion efficiency or usage requirements of existing straight-through tunnel kilns. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems, and provides a straight-through tunnel kiln.

[0004] A straight-through tunnel kiln, which comprises: a first lifting track rack, a preheating tunnel kiln, a main firing tunnel kiln, a low-nitrogen combustion device, a cooling tunnel kiln, a second lifting track rack, and a controller; the first lifting track rack and the second lifting track rack have the same structure; the first lifting track rack, the preheating tunnel kiln, the main firing tunnel kiln, the cooling tunnel kiln, and the second lifting track rack are connected in sequence; the inner bottom surface of the preheating tunnel kiln is provided with a preheating kiln track; the inside of the main firing tunnel kiln is provided with a main kiln track; the inner bottom of the cooling tunnel kiln is provided with a cooling kiln track; the preheating kiln track, the main kiln track, and the cooling kiln track are connected in sequence; the low-nitrogen combustion device is arranged on the main firing tunnel kiln; the low-nitrogen combustion device comprises: a combustible supply pipe, an oxidant supply pipe, a gas mixer, and a circulating burner; one end of the combustible supply pipe is connected to the main combustible pipe; the oxidant supply pipe is connected to the main oxidant; the other end of the combustible supply pipe and the other end of the oxidant supply pipe are hermetically connected to the upper end of the gas mixer; the lower end of the gas mixer is hermetically connected to the circulating burner; the gas mixer and the circulating burner can fully mix and burn by draining the suspended matter in the kiln.

[0005] One end of the preheating tunnel kiln is provided with a kiln door for sealing the kiln; the other end face of the preheating tunnel kiln is provided with a preheating kiln docking stop; the side of the other end of the preheating tunnel kiln is provided with a preheating kiln connection lock; the top of the preheating tunnel kiln is provided with a preheating heater; the inner bottom surface of the preheating tunnel kiln is provided with a preheating kiln track; the preheating kiln track can be docked with the first outer track; the side of the preheating tunnel kiln is also provided with a lifting ear hole; the lifting ear hole is convenient for hoisting and assembling the preheating tunnel kiln.

[0006] The end faces at both ends of the main firing tunnel kiln are provided with main kiln docking stops; the sides at both ends of the main firing tunnel kiln are provided with main kiln connection locks; the low-nitrogen combustion device is arranged on the top of the main firing tunnel kiln; the main kiln docking stop is connected to the preheating kiln docking stop; the main kiln connection lock is locked with the preheating kiln connection lock; the inside of the main firing tunnel kiln is provided with a main kiln track; one end of the main kiln track is docked with the preheating kiln track.

[0007] The gas mixer is provided with: a first intake pipe of the gas mixer, a second intake pipe of the gas mixer, a gas jet port of the gas mixer, and a first compression nozzle; the first intake pipe of the gas mixer is arranged at one end of the gas mixer; the gas jet port of the gas mixer is arranged at the other end of the gas mixer; the second intake pipe of the gas mixer is arranged on one side of the first intake pipe of the gas mixer; the first compression nozzle is arranged inside the gas mixer; a first negative pressure chamber and a first mixing throat section are arranged inside the gas mixer; the nozzle opening of the first compression nozzle is arranged at the junction of the first negative pressure chamber and the first mixing throat section; one end of the second intake pipe of the gas mixer is provided with an access pipe connection part; the other end of the second intake pipe of the gas mixer is connected to the first negative pressure chamber of the gas mixer; the gas jet port of the gas mixer is arranged on the inner top wall of the main firing tunnel kiln.

[0008] The nozzle opening inner diameter of the first compression nozzle is smaller than the inner diameter of the first intake pipe of the gas mixer.

[0009] The circulating burner is provided with: a first intake port of the burner, a second intake port of the burner, a gas jet port of the burner, and a second compression nozzle; the first intake port of the burner and the gas jet port of the burner are respectively arranged at both ends of the circulating burner, and the second intake port of the burner is arranged on the side of the circulating burner; the second compression nozzle is arranged inside the circulating burner; the other end of the second intake port of the burner is connected to the second negative pressure chamber; a second negative pressure chamber and a second mixing throat section are arranged inside the circulating burner; the nozzle opening of the second compression nozzle is arranged at the junction of the second negative pressure chamber and the second mixing throat section; the nozzle opening inner diameter of the second compression nozzle is smaller than the inner diameter of the first intake port of the burner; the inner diameter of the gas jet port of the burner is smaller than the inner diameter of the first intake port of the burner.

[0010] One end of the cooling tunnel kiln is provided with a docking stop of the cooling kiln; the docking stop of the cooling kiln is connected to the main kiln docking stop at the outlet end of the main firing tunnel kiln; the other end of the cooling tunnel kiln is provided with a kiln door, and a cooling kiln track is arranged at the inner bottom of the cooling tunnel kiln; one end of the cooling kiln track is docked with the other end of the main kiln track; a cooling fan is arranged at the top of the cooling tunnel kiln.

[0011] This technical solution provides a through-type tunnel kiln, which includes: a first lifting track frame, a preheating tunnel kiln, a main firing tunnel kiln, a low-nitrogen combustion device, a cooling tunnel kiln, a second lifting track frame, and a controller; the first lifting track frame and the second lifting track frame have the same structure; the first lifting track frame, the preheating tunnel kiln, the main firing tunnel kiln, the cooling tunnel kiln, and the second lifting track frame are connected in sequence; the low-nitrogen combustion device is arranged on the main firing tunnel kiln; the low-nitrogen combustion device includes: a combustible supply pipe, an oxidant supply pipe, a gas mixer, and a circulating burner; the other end of the combustible supply pipe and the other end of the oxidant supply pipe are hermetically connected to the upper end of the gas mixer; the lower end of the gas mixer is hermetically connected to the circulating burner; the gas mixer and the circulating burner can fully mix and burn by draining the suspended substances in the kiln furnace. This through-type tunnel kiln solves the problems of large NOx emissions and inconvenient transportation of fired items in the through-type kiln furnace. Brief Description of the Drawings

[0012] Figure 1 is an overall schematic diagram of a straight-through tunnel kiln of the present utility model;

[0013] Figure 2 is a schematic structural diagram of the lifting track frame of a straight-through tunnel kiln of the present utility model;

[0014] Figure 3 is a schematic structural diagram of the preheating tunnel kiln of a straight-through tunnel kiln of the present utility model;

[0015] Figure 4 is a schematic structural diagram of the main firing tunnel kiln of a straight-through tunnel kiln of the present utility model;

[0016] Figure 5 is a schematic structural diagram of the burner of a straight-through tunnel kiln of the present utility model. Detailed Description of the Preferred Embodiments

[0017] Next, in conjunction with the attached drawings of the technical solution, the technical solution will be further clearly and completely described. The described embodiments are only a part of the technical solution, rather than all of the embodiments. Based on the present technical solution, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present utility model.

[0018] Embodiment 1

[0019] See Figures 1 to 5 as shown, a straight-through tunnel kiln, which includes: a first lifting track frame 1, a preheating tunnel kiln 2, a main firing tunnel kiln 3, a low-nitrogen combustion device 4, a cooling tunnel kiln 5, a second lifting track frame 6, and a controller 8;

[0020] The first lifting track frame 1, the preheating tunnel kiln 2, the main firing tunnel kiln 3, the cooling tunnel kiln 5, and the second lifting track frame 6 are connected in sequence; the low-nitrogen combustion device 4 is arranged on the main firing tunnel kiln 3.

[0021] The first lifting track frame 1 and the second lifting track frame 6 have the same structure;

[0022] The first lifting track frame 1 includes: a first track chassis 11, a chassis fixed hinge shaft 12, a lifting frame lower slide rail 13, a push rod fixing part 14, a scissor lifting frame 15, a hydraulic push rod 16, a track support plate 17, a lifting frame upper slide rail, and a first outer track 19; the chassis fixed hinge shaft 12 and the lifting frame lower slide rail 13 are fixed on the first track chassis 11; the push rod fixing part 14 is arranged on one side close to the chassis fixed hinge shaft 12;

[0023] The described scissor lift 15 includes: a first lifting rod 151, a second lifting rod 152, a lower slider 153 of the lift, a slider link connection 154, and an upper slider 155 of the lift;

[0024] The middle parts of the first lifting rod 151 and the second lifting rod 152 are pivotally connected; the lower end of the first lifting rod 151 is pivotally connected to the fixed hinge shaft 12 of the chassis; the lower slider 153 of the lift is pivotally connected to the lower end of the second lifting rod 152; the lower slider 153 of the lift slides horizontally on the lower lift rail 13; one end of the hydraulic push rod 16 is fixedly connected to the push rod fixing part 14; the hydraulic push rod 16 is provided with a hydraulic lifting rod 161, and the hydraulic lifting rod 161 is connected to the slider link 154 through a coupling 162;

[0025] On one side of the lower end face of the track support plate 17, there is a support plate fixed hinge shaft 171, and the top of the second lifting rod 152 is pivotally connected to the support plate fixed hinge shaft 171; the upper lift rail is fixed on the other side of the lower end face of the track support plate 17, and the upper end of the second lifting rod 152 is pivotally connected at the support plate fixed hinge shaft 171; the first lifting rod 151 is pivotally connected to the upper slider 155 of the lift;

[0026] The first outer track 19 is a transport track for the kiln car of the kiln; the first outer track 19 is arranged on the upper end face of the track support plate 17; that is, on the first track chassis 11, there are a scissor lift 15, a hydraulic push rod 16, a track support plate 17, and a first outer track 19. The first outer track 19 is arranged on the upper end face of the track support plate 17, and the hydraulic push rod 16 lifts the first outer track 19 through the lift 15.

[0027] One end of the preheating tunnel kiln 2 is provided with a kiln door 21 for sealing the kiln, and the other end face of the preheating tunnel kiln 2 is provided with a preheating kiln docking stop 22; on the other side of the preheating tunnel kiln 2, there is a preheating kiln connection lock 23; on the top of the preheating tunnel kiln 2, there is a preheater 24; on the inner bottom surface of the preheating tunnel kiln 2, there is a preheating kiln track 25; the preheating kiln track 25 can be docked with the first outer track 19;

[0028] On the side of the preheating tunnel kiln 2, there are also lifting ear holes 26; the lifting ear holes 26 facilitate the hoisting and assembly of the preheating tunnel kiln 2.

[0029] At both end faces of the main firing tunnel kiln 3, there are main kiln docking stops 31; at both sides of the main firing tunnel kiln 3, there are main kiln connection locks 32; the low-nitrogen combustion device 4 is arranged on the top of the main firing tunnel kiln 3; the main kiln docking stop 31 is connected to the preheating kiln docking stop 22 in a stop connection; the main kiln connection lock 32 is connected to the preheating kiln connection lock 23 in a lock connection;

[0030] Inside the main firing tunnel kiln 3, there is a main kiln track 33; one end of the main kiln track 33 is docked with the preheating kiln track 25.

[0031] The described low-nitrogen combustion device 4 includes: a combustible supply pipe 41, an oxidizer supply pipe 42, a gas mixer 43, and a circulating burner 44;

[0032] One end of the described combustible supply pipe 41 is connected to the main combustible pipe 91; the oxidizer supply pipe 42 is connected to the main oxidizer pipe 92; the other ends of the combustible supply pipe 41 and the oxidizer supply pipe 42 are hermetically connected to the upper end of the gas mixer 43; the lower end of the gas mixer 43 is hermetically connected to the circulating burner 44;

[0033] A first flow control valve 411 and a first flow sensor 412 are also connected in series on the described combustible supply pipe 41; the first flow control valve 411 and the first flow sensor 412 control the amount and flow rate of the combustible entering the gas mixer 43;

[0034] A second flow control valve 421 is also connected in series on the described oxidizer supply pipe 42; the second flow control valve 421 controls the supply amount of the oxidizer.

[0035] Both the described gas mixer 43 and the circulating burner 44 are gas mixing devices with a Venturi effect;

[0036] The described gas mixer 43 is provided with: a first gas inlet pipe 431 of the gas mixer, a second gas inlet pipe 432 of the gas mixer, a gas jet port 433 of the gas mixer, and a first compression nozzle 434; the first gas inlet pipe 431 of the gas mixer is arranged at one end of the gas mixer 43; the gas jet port 433 of the gas mixer is arranged at the other end of the gas mixer 43; the second gas inlet pipe 432 of the gas mixer is arranged on one side of the first gas inlet pipe 431 of the gas mixer; the first compression nozzle 434 is arranged inside the gas mixer 43;

[0037] A first negative pressure chamber 435 and a first mixing throat portion 436 are arranged inside the described gas mixer 43; the nozzle opening of the first compression nozzle 434 is arranged at the junction of the first negative pressure chamber 435 and the first mixing throat portion 436;

[0038] One end of the described second gas inlet pipe 432 of the gas mixer is provided with an access pipe connection portion 321; the other end of the second gas inlet pipe 432 of the gas mixer is connected to the first negative pressure chamber 435 of the gas mixer 43;

[0039] The described gas jet port 433 of the gas mixer is arranged on the inner top wall of the main firing tunnel kiln 3;

[0040] The nozzle opening inner diameter of the described first compression nozzle 434 is smaller than the inner diameter of the first gas inlet pipe 431 of the gas mixer;

[0041] The described circulating burner 44 is provided with: a first burner air inlet 441, a second burner air inlet 442, a burner jet orifice 443, and a second compression nozzle 444; the first burner air inlet 441 and the burner jet orifice 443 are respectively arranged at both ends of the circulating burner 44, the second burner air inlet 442 is arranged on the side of the circulating burner 44; the second compression nozzle 444 is arranged inside the circulating burner 44; the other end of the second burner air inlet 442 is connected to the second negative pressure chamber 445;

[0042] A second negative pressure chamber 445 and a second mixing throat portion 446 are arranged inside the described circulating burner 44; the nozzle orifice of the second compression nozzle 444 is arranged at the junction of the second negative pressure chamber 445 and the second mixing throat portion 446;

[0043] The inner diameter of the nozzle orifice of the second compression nozzle 444 is smaller than the inner diameter of the first burner air inlet 441; the inner diameter of the burner jet orifice 443 is smaller than the inner diameter of the first burner air inlet 441.

[0044] One end of the described cooling tunnel kiln 5 is provided with a cooling kiln docking stop; the cooling kiln docking stop is connected to the main kiln docking stop 31 at the outlet end of the main firing tunnel kiln 3; the other end of the cooling tunnel kiln 5 is provided with a kiln door, the bottom inside the cooling tunnel kiln 5 is provided with a cooling kiln track; one end of the cooling kiln track is docked with the other end of the main kiln track 33; a cooling fan 54 is arranged at the top of the cooling tunnel kiln 5; the described second lifting track frame 6 has the same structure as the first lifting track frame 1; a second outer track 29 is arranged on the second lifting track frame 6; the second outer track 29 is hydraulically lifted and docked with the other end of the cooling kiln track.

[0045] The described controller 8 is arranged beside the tunnel kiln, and the controller 8 is electrically connected to the first lifting track frame 1, the pre-heater 24, the first flow control valve 411, the first flow sensor 412, the second flow control valve 421, and the second lifting track frame 6 respectively.

Claims

1. A straight tunnel kiln, comprising: A first lifting track frame (1), a preheating tunnel kiln (2), a main firing tunnel kiln (3), a low nitrogen combustion device (4), a cooling tunnel kiln (5), a second lifting track frame (6), and a controller (8); characterized in that: the first lifting track frame (1) and the second lifting track frame (6) have the same structure; the first lifting track frame (1), the preheating tunnel kiln (2), the main firing tunnel kiln (3), the cooling tunnel kiln (5) and the second lifting track frame (6) are connected in sequence; the inner bottom surface of the preheating tunnel kiln (2) is provided with a preheating kiln track (25); the main firing tunnel kiln (3) is provided with a main kiln track (33); the inner bottom of the cooling tunnel kiln (5) is provided with a cooling kiln track; the preheating kiln track (25 ), the main kiln track (33) and the cooling kiln track are connected in sequence; the low nitrogen combustion device (4) is arranged on the main firing tunnel kiln (3); the low nitrogen combustion device (4) comprises: a combustible supply pipe (41), an oxidant supply pipe (42), an aerator (43), and a circulating burner (44); one end of the combustible supply pipe (41) is connected to the main combustible pipe; the oxidant supply pipe (42) is connected to the main oxidant pipe; the other end of the combustible supply pipe (41) and the other end of the oxidant supply pipe (42) are sealedly connected to the upper end of the aerator (43); the lower end of the aerator (43) is sealedly connected to the circulating burner (44); the aerator and the circulating burner can guide the suspended matter in the kiln to be fully mixed and burned.

2. The straight-through tunnel kiln according to claim 1, characterized in that: The preheating tunnel kiln (2) is provided with a kiln door (21) for sealing the kiln at one end, and a preheating kiln docking stop (22) is provided at the other end face of the preheating tunnel kiln (2); a preheating kiln connecting lock (23) is provided at the side surface of the other end of the preheating tunnel kiln (2); a preheating heater (24) is provided at the top of the preheating tunnel kiln (2); and a preheating kiln track (25) can be docked with the first outer track (19).

3. The straight tunnel kiln according to claim 2, characterized in that: The main firing tunnel kiln (3) is provided with main kiln docking stoppers (31) at both end faces; the main kiln connection lock buckles (32) are provided at both ends of the main firing tunnel kiln (3); the low-nitrogen combustion device (4) is arranged on the top of the main firing tunnel kiln (3); the main kiln docking stopper (31) is connected to the preheating kiln docking stopper (22); the main kiln connection lock buckle (32) is lock-connected to the preheating kiln connection lock buckle (23); one end of the main kiln track (33) is docked with the preheating kiln track (25).

4. The straight-through tunnel kiln according to claim 3, characterized in that: The aerator (43) is provided with: a first aerator air inlet pipe (431), a second aerator air inlet pipe (432), a mixer jet port (433), and a first compression nozzle (434); the first aerator air inlet pipe (431) is provided at one end of the aerator (43); the aerator jet port (433) is provided at the other end of the aerator (43); the second aerator air inlet pipe (432) is provided at one side of the first aerator air inlet pipe (431); and the first compression nozzle (434) is provided in the aerator (43); A first negative pressure chamber (435) and a first mixing throat section (436) are provided in the aerator (43); a mouth of a first compression nozzle (434) is arranged at the junction of the first negative pressure chamber (435) and the first mixing throat section (436); an access pipe connection section (321) is provided at one end of a second air inlet pipe (432) of the aerator; the other end of the second air inlet pipe (432) of the aerator is connected to the first negative pressure chamber (435) of the aerator (43); and an aerator jet port (433) is arranged on the inner top wall of the main firing tunnel kiln (3).

5. The straight-through tunnel kiln according to claim 4, characterized in that: The inner diameter of the mouth of the first compression nozzle (434) is smaller than the inner diameter of the first air inlet pipe (431) of the mixer.

6. The straight-through tunnel kiln according to claim 5, characterized in that: The circulating burner (44) is provided with: a first burner air inlet (441), a second burner air inlet (442), a burner jet (443), and a second compression nozzle (444); the first burner air inlet (441) and the burner jet (443) are respectively arranged at two ends of the circulating burner (44), the second burner air inlet (442) is arranged on the side of the circulating burner (44); the second compression nozzle (444) is arranged in the circulating burner (44); the second burner air inlet (441) and the burner jet (443) are arranged at two ends of the circulating burner (44), and the second burner air inlet (442) is arranged on the side of the circulating burner (44); the second compression nozzle (444) is arranged in the circulating burner (44); the second burner air inlet (442) 442) is connected to the second negative pressure chamber (445); the second negative pressure chamber (445) and the second mixing throat section (446) are provided on the inner side of the circulating burner (44); the mouth of the second compression nozzle (444) is provided at the junction of the second negative pressure chamber (445) and the second mixing throat section (446); the inner diameter of the mouth of the second compression nozzle (444) is smaller than the inner diameter of the first air inlet (441) of the burner; and the inner diameter of the burner jet port (443) is smaller than the inner diameter of the first air inlet (441) of the burner.

7. The straight-through tunnel kiln according to claim 5, characterized in that: A cooling kiln docking stop is provided at one end of the cooling tunnel kiln (5); the cooling kiln docking stop is connected to a main kiln docking stop (31) at the outlet end of the main firing tunnel kiln (3); a kiln door is provided at the other end of the cooling tunnel kiln (5); a cooling kiln track is provided at the bottom of the cooling tunnel kiln (5); one end of the cooling kiln track is docked with the other end of the main kiln track (33); a cooling fan (54) is provided at the top of the cooling tunnel kiln (5).

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