Movable tunnel kiln with flue gas re-burning system

Abstract

A movable tunnel kiln with a flue gas re-burning system comprises a main body and a flue gas system, the main body comprises a drying section, a preheating section, a roasting section and a cooling section which are sequentially connected, and the flue gas system comprises a flue unit, a moisture removal unit and a desulfurizing tower. The flue gas system further comprises a flue gas re-burning unit, the flue gas re-burning unit comprises a flue gas re-burning main pipeline, a second fan, a smoke suction assembly and a smoke exhaust assembly, the second fan is communicated with the front portion and the rear portion of the flue gas re-burning main pipeline, and the front portion of the flue gas re-burning main pipeline is communicated with the smoke suction assembly. The method has the beneficial effects that firstly, the environment-friendly characteristic is improved; secondly, the emission reduction characteristic is improved; and thirdly, the energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the field of brick and tile production equipment, in particular to a mobile tunnel kiln with a flue gas re-firing system. Background Art

[0002] The process of sintering bricks to make bricks will produce a large amount of solid particles, carbon dioxide, and other polluting gases.

[0003] Wheel kiln is a popular name in China. Its emergence has enabled brick and tile production to move from workshop-style small-scale production to large-scale industrial production. Among them, the patent document with patent publication number CN201600018U can be used as the prior art closest to the technology in this field.

[0004] The existing traditional rotary kiln has the following disadvantages: First, a large amount of dust particles are generated during the brick-burning process. It should be noted that the flue gas concentration is often evaluated by measuring the oxygen content of the flue gas. The lower the oxygen content, the lower the amount of particles or dust in the flue gas, which is beneficial to environmental protection. Second, the amount of waste gas generated by brick making is relatively large. Third, the degree of energy consumption is relatively serious, which increases production costs.

[0005] Therefore, it is necessary to seek a new technical solution to solve the above technical problems. Summary of the invention

[0006] The present invention provides a mobile tunnel kiln with a flue gas re-firing system, the innovation purposes of which are: first, to improve environmental protection characteristics; second, to improve emission reduction characteristics; and third, to reduce energy consumption.

[0007] The specific scheme is as follows: A mobile tunnel kiln with a flue gas re-burning system, the mobile tunnel kiln includes a main body 1 and a flue gas system, the main body 1 includes a drying section 2, a preheating section 3, a roasting section 4, and a cooling section 5 connected in sequence, the flue gas system includes a flue unit, a dehumidification unit, and a desulfurization tower 23, the flue unit includes a main flue 6, a hail 14, a main fan 7, and a hot air supply duct 8, the main fan 7 connects the front 61 and the rear 62 of the main flue 6, the rear 62 of the main flue 6 is connected to the inner cavity of the preheating section 3 of the mobile tunnel kiln main body 1 through a plurality of the hails 14, the hot air supply duct 8 is arranged on the outside of the drying section 2, one end of the hot air supply duct 8 is connected to the main flue 6, and the hot air supply duct 8 is connected to the inner cavity of the drying section 2 of the mobile tunnel kiln main body 1 through the first branch pipe 12.

[0008] Furthermore, the dehumidification unit is arranged on the outside of the drying section 2, including a dehumidification air duct 9, an annular flue 10, and a dehumidification fan 11. The air inlet of the dehumidification fan 11 is connected to the annular flue 10, and the air outlet of the dehumidification fan 11 is connected to the desulfurization tower 23; one end of the dehumidification air duct 9 is connected to the annular flue 10, and the dehumidification air duct 9 is connected to the inner cavity of the drying section 2 of the mobile tunnel kiln main body 1 through the dehumidification port 13.

[0009] Furthermore, the flue gas system also includes a flue gas reburning unit, which includes a flue gas reburning main pipeline 15, a second fan 16, a smoking assembly, and a smoke exhaust assembly. The second fan 16 connects the front and rear of the flue gas reburning main pipeline 15, and the front of the flue gas reburning main pipeline 15 is connected to the smoking assembly. The smoking assembly includes a first branch pipeline 17 and a gate 19. The first branch pipeline 17 is connected to the dehumidification air duct 9, and the dehumidification air duct 9 is provided with a gate 19 near the annular flue 10; the rear of the flue gas reburning main pipeline 15 is provided with a smoke exhaust assembly, which is located in the cooling section 5 of the mobile tunnel kiln body 1, and the cooling section 5 is located near the roasting section 4. The smoke exhaust assembly includes a second branch pipeline 18, and the second branch pipeline 18 is connected to the inner cavity of the mobile tunnel kiln body 1.

[0010] Preferably, there are two groups of flue units, which are respectively arranged on both sides of the movable tunnel kiln body 1.

[0011] Preferably, one end of the dehumidification duct 9 away from the annular flue 10 is arranged in the inner cavity of the mobile tunnel kiln body 1, and the dehumidification port 13 is arranged at a position close to the ground.

[0012] Preferably, the number of the hot air supply ducts 8 is 15 to 25.

[0013] Preferably, the moisture removal air ducts 9 are in 6 to 15 groups.

[0014] Preferably, the front part of the flue gas re-burning main pipeline 15 is connected to the dehumidification duct 9 through two groups of mutually symmetrical first branch pipelines 17; the rear part of the flue gas re-burning main pipeline 15 is connected to the inner cavity of the mobile tunnel kiln body 1 through two groups of mutually symmetrical second branch pipelines 18.

[0015] Preferably, the number of the hot air supply ducts 8 is 21, the number of the moisture exhaust ducts 9 is 9, the number of the smoke suction components of the smoke reburning unit is 4, and the number of the smoke exhaust components is 3.

[0016] Furthermore, the flue gas system also includes a waste heat drying unit, which includes a waste heat drying main pipeline 22 and a third fan 20. The third fan 20 connects the front and rear of the waste heat drying main pipeline 22. The rear inlet of the waste heat drying main pipeline 22 is connected to the inner cavity of the cooling section 5 of the mobile tunnel kiln body 1 through the third branch pipeline 21. The front outlet of the waste heat drying main pipeline 22 is arranged at the brick position outside the mobile tunnel kiln body 1.

[0017] Beneficial effects of the present invention: First, the use of this technical solution can reduce the oxygen content in the flue gas, and the oxygen content can be reduced from the original 20% to about 16%. The low oxygen content reflects the low amount of particles or dust in the flue gas, which improves the environmental protection characteristics; second, it is emission reduction. Originally, there were nine outlets corresponding to the exhaust air duct 9 to the desulfurization tower. Now, four of the outlets are closed by the gate 19, leaving five outlets for discharge, and the other four outlets are used for re-firing. Therefore, the emission is reduced by about four-ninths, which is about 45% in percentage. Third, it is energy saving. The use of this technical solution recovers a part of the flue gas with heat from the drying section 2 and sends it to the roasting section 4 for re-firing, which reduces the sintering energy consumption of the roasting section. At the same time, it also allows the appropriate 50°C airflow to act on the drying section. The original need for about 300 kcal of coal heat now only requires about 200 kcal of heat, saving about 35% energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a mobile tunnel kiln with a flue gas re-firing system.

[0019] Figure 2 It is a schematic diagram of a segmented description of the mobile tunnel kiln with a flue gas re-firing system.

[0020] Figure 3 It is a partial schematic diagram of the mobile tunnel kiln with a flue gas re-firing system. DETAILED DESCRIPTION

[0021] Figure 1 , 2 , 3. Explanation of the lead-in marks: main body 1, drying section 2, preheating section 3, roasting section 4, cooling section 5, main flue 6, front part 61 of the main flue, rear part 62 of the main flue, main fan 7, hot air supply duct 8, dehumidification duct 9, annular flue 10, dehumidification fan 11, first branch pipe 12, dehumidification outlet 13, exhaust air 14, flue gas re-burning main duct 15, second fan 16, first branch duct 17, second branch duct 18, gate 19, third fan 20, third branch duct 21, waste heat drying main duct 22, desulfurization tower 23.

[0022] Reference Figure 1 , Figure 2 , Figure 3A mobile tunnel kiln with a flue gas re-burning system, the mobile tunnel kiln includes a main body 1 and a flue gas system, the main body 1 includes a drying section 2, a preheating section 3, a roasting section 4, and a cooling section 5 connected in sequence, the flue gas system includes a flue unit, a dehumidification unit, and a desulfurization tower 23, the flue unit includes a main flue 6, a hail 14, a main fan 7, and a hot air supply duct 8, the main fan 7 connects the front 61 and the rear 62 of the main flue 6, the rear part of the main flue 6 is connected to the inner cavity of the preheating section 3 of the mobile tunnel kiln main body 1 through a plurality of hails 14, the hot air supply duct 8 is arranged on the outside of the drying section 2, one end of the hot air supply duct 8 is connected to the main flue 6, and the hot air supply duct 8 is connected to the inner cavity of the drying section 2 of the mobile tunnel kiln main body 1 through a first branch pipe 12.

[0023] Further, the dehumidification unit is arranged outside the drying section 2, including a dehumidification air duct 9, an annular flue 10, and a dehumidification fan 11. The air inlet of the dehumidification fan 11 is connected to the annular flue 10, and the air outlet of the dehumidification fan 11 is connected to the desulfurization tower 23; one end of the dehumidification air duct 9 is connected to the annular flue 10, and the dehumidification air duct 9 is connected to the inner cavity of the drying section 2 of the mobile tunnel kiln body 1 through the dehumidification port 13. The dehumidification port 13 is arranged below the dehumidification air duct 9, which helps the high-density humid gas to sink, plays a role in dehumidification, and ensures the drying quality of the bricks.

[0024] Furthermore, the flue gas system also includes a flue gas re-burning unit, which includes a flue gas re-burning main pipeline 15, a second fan 16, a smoking assembly, and a smoke exhaust assembly. The second fan 16 connects the front and rear of the flue gas re-burning main pipeline 15. The front of the flue gas re-burning main pipeline 15 is connected to the smoking assembly. The smoking assembly includes a first branch pipeline 17 and a gate 19. The first branch pipeline 17 is connected to the dehumidification air duct 9. A gate 19 is provided between the dehumidification air duct 9 and the annular flue 10. The rear of the flue gas re-burning main pipeline 15 is provided with a smoke exhaust assembly, which is located in the cooling section 5 of the mobile tunnel kiln body 1. The cooling section 5 is located close to the roasting section 4. The flue gas sucked from the front through the smoking assembly enters the roasting section from the cooling section for secondary re-burning. The smoke exhaust assembly includes a second branch pipeline 18, which is connected to the inner cavity of the mobile tunnel kiln body 1. The hot flue gas is transported to the roasting section 4 for re-burning through the second fan 16, so that the roasting section 4 utilizes part of the heat, so that the temperature of the roasting section 4 rises faster, the heat loss is reduced, and other harmful substances in the flue gas are burned again, and the environmental protection of the flue gas is also improved.

[0025] Preferably, there are two groups of flue units, which are respectively arranged on both sides of the movable tunnel kiln body 1.

[0026] Preferably, one end of the dehumidification duct 9 away from the annular flue 10 is arranged in the inner cavity of the mobile tunnel kiln body 1, and the dehumidification port 13 is arranged at a position close to the ground.

[0027] Preferably, the number of the hot air supply ducts 8 is 15 to 25.

[0028] Preferably, the moisture removal air ducts 9 are in 6 to 15 groups.

[0029] Preferably, the front part of the flue gas re-burning main pipeline 15 is connected to the dehumidification air duct 9 through two sets of mutually symmetrical first branch pipelines 17; the rear part of the flue gas re-burning main pipeline 15 is connected to the inner cavity of the mobile tunnel kiln body 1 through two sets of mutually symmetrical second branch pipelines 18. The symmetrical design of the first branch pipeline 17 and the second branch pipeline 18 can transport heat more evenly and improve the heat transfer efficiency.

[0030] In this embodiment, there are 21 groups of hot air ducts 8, 9 groups of moisture exhaust ducts 9, 4 groups of smoking components of the flue gas reburning unit, and 3 groups of smoke exhaust components. The oxygen content is reduced from the original 20% to about 16%, saving about 35% energy and reducing emissions by 45%, achieving the most superior usage state.

[0031] Furthermore, the flue gas system also includes a waste heat drying unit, which includes a waste heat drying main pipeline 22 and a third fan 20. The third fan 20 is connected to the front and rear of the waste heat drying main pipeline 22. The rear inlet of the waste heat drying main pipeline 22 is connected to the inner cavity of the cooling section 5 of the mobile tunnel kiln body 1 through the third branch pipeline 21. The front outlet of the waste heat drying main pipeline 22 is arranged at the brick blank position outside the mobile tunnel kiln body 1. There is waste heat in the cooling section 5. Through the waste heat drying main pipeline 22, under the action of the third fan 20, the waste heat is sent from the cooling section 5 at one end of the waste heat drying main pipeline 22 to the waste heat drying section 23 at the other end of the waste heat drying main pipeline 22 to pre-dry and dehydrate the wet brick blanks. The device utilizes part of the waste heat, and the energy utilization rate is higher.

[0032] The above is a specific description of the best implementation mode of the present application, but the invention of the present application is not limited to this embodiment. Those skilled in the art can make various equivalent changes or substitutions without violating the spirit of the present application. These equivalent changes or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A mobile tunnel kiln with a flue gas re-firing system, the mobile tunnel kiln comprising a main body (1) and a flue gas system, the main body (1) comprising a drying section (2), a preheating section (3), a roasting section (4), and a cooling section (5) connected in sequence, the flue gas system comprising a flue unit, a moisture removal unit, and a desulfurization tower (23), characterized in that: The flue unit comprises a main flue (6), a heat exhaust air (14), a main fan (7), and a hot air supply duct (8); the main fan (7) is connected to a front portion (61) and a rear portion (62) of the main flue (6); the rear portion of the main flue (6) is connected to an inner cavity of a preheating section (3) of the mobile tunnel kiln body (1) via a plurality of heat exhaust air (14); the hot air supply duct (8) is arranged outside the drying section (2); one end of the hot air supply duct (8) is connected to the main flue (6); and the hot air supply duct (8) is connected to an inner cavity of a drying section (2) of the mobile tunnel kiln body (1) via a first branch pipe (12); The dehumidification unit is arranged outside the drying section (2), and comprises a dehumidification air duct (9), an annular flue (10), and a dehumidification fan (11); the air inlet of the dehumidification fan (11) is connected to the annular flue (10), and the air outlet of the dehumidification fan (11) is connected to the desulfurization tower (23); one end of the dehumidification air duct (9) is connected to the annular flue (10), and the dehumidification air duct (9) is connected to the inner cavity of the drying section (2) of the mobile tunnel kiln body (1) through the dehumidification outlet (13); The flue gas system further comprises a flue gas re-burning unit, the flue gas re-burning unit comprising a flue gas re-burning main pipeline (15), a second fan (16), a suction assembly, and a smoke exhaust assembly. The second fan (16) is connected to the front and rear parts of the flue gas re-burning main pipeline (15). The front part of the flue gas re-burning main pipeline (15) is connected to the suction assembly. The suction assembly comprises a first branch pipeline (17) and a damper (19). The first branch pipeline (17) is connected to the dehumidification air duct (9). The damper (19) is provided at a position of the dehumidification air duct (9) close to the annular flue (10). The rear part of the flue gas re-burning main pipeline (15) is provided with a smoke exhaust assembly. The smoke exhaust assembly is located in the cooling section (5) of the mobile tunnel kiln body (1). The cooling section (5) is close to the roasting section (4). The smoke exhaust assembly comprises a second branch pipeline (18). The second branch pipeline (18) is connected to the inner cavity of the mobile tunnel kiln body (1).

2. The mobile tunnel kiln with a flue gas re-firing system according to claim 1, characterized in that: There are two groups of flue units, which are respectively arranged on both sides of the movable tunnel kiln body (1).

3. A mobile tunnel kiln with a flue gas re-firing system according to claim 1 or 2, characterized in that: One end of the dehumidification air duct (9) away from the annular flue (10) is arranged in the inner cavity of the mobile tunnel kiln body (1), and the dehumidification port (13) is arranged at a position close to the ground.

4. The mobile tunnel kiln with a flue gas re-firing system according to claim 1, characterized in that: The number of the hot air supply ducts (8) is 15 to 25.

5. The mobile tunnel kiln with a flue gas re-firing system according to claim 1, characterized in that: The moisture removal air ducts (9) are in groups of 6 to 15.

6. The mobile tunnel kiln with a flue gas re-firing system according to claim 1, characterized in that: The front part of the flue gas re-burning main pipeline (15) is connected to the moisture exhaust duct (9) through two groups of mutually symmetrical first branch pipelines (17); the rear part of the flue gas re-burning main pipeline (15) is connected to the inner cavity of the mobile tunnel kiln body (1) through two groups of mutually symmetrical second branch pipelines (18).

7. A mobile tunnel kiln with a flue gas re-firing system according to any one of claims 1, 4 or 5, characterized in that: The number of the hot air supply ducts (8) is 21, the number of the moisture exhaust ducts (9) is 9, the number of the smoking components is 4, and the number of the smoke exhaust components is 3.

8. The mobile tunnel kiln with a flue gas re-firing system according to claim 1, characterized in that: The flue gas system further comprises a waste heat drying unit, the waste heat drying unit comprising a waste heat drying main pipeline (22) and a third fan (20), the third fan (20) being connected to the front and rear of the waste heat drying main pipeline (22), the rear inlet of the waste heat drying main pipeline (22) being connected to the inner cavity of the cooling section (5) of the mobile tunnel kiln body (1) through a third branch pipeline (21), and the front outlet of the waste heat drying main pipeline (22) being arranged at a brick blank position outside the mobile tunnel kiln body (1).

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