Flue gas circulation energy-saving tunnel kiln

Abstract

The utility model discloses a flue gas circulation energy-saving tunnel kiln which comprises a preheating kiln section, a firing kiln section, a cooling kiln section, a first flue gas circulation device, a second flue gas circulation device and a combustor. The preheating kiln section, the firing kiln section and the cooling kiln section are sequentially connected in a sealed mode. The combustor is arranged in the firing kiln section; the first smoke circulating device is used for introducing smoke in the firing kiln section into the preheating kiln section to preheat ingredients; air curtains arranged at the tops of the two sides of the preheating kiln section enable preheating hot air to circulate in the preheating kiln section; the cooled and fired materials in the cooling kiln section, cooling smoke in the cooling kiln section and discharged smoke in the firing kiln section are filtered by a smoke dust cooling filter and then are discharged; high-heat flue gas in the firing kiln section is introduced into the preheating kiln section for ingredient preheating, flue gas circulation is low, energy consumption of a combustor is reduced, and flue dust is cooled and subjected to impurity removal, so that environmental pollution is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel kilns, and in particular relates to a flue gas circulation energy-saving tunnel kiln. Background Art

[0002] Tunnel kiln is a modern continuous firing thermal equipment, which is widely used in the roasting production of ceramic products. Tunnel kiln is built of refractory materials, thermal insulation materials and building materials, and is equipped with kiln cars and other vehicles. Tunnel kiln is generally a long straight tunnel with fixed walls and arches on both sides and the top, and kiln cars running on the tracks laid at the bottom. The combustion equipment is located on both sides of the middle of the tunnel kiln, forming a fixed high-temperature firing section. The high-temperature flue gas generated by the combustion flows along the tunnel toward the kiln head under the action of the induced draft fan at the front end of the tunnel kiln, and gradually preheats the products entering the kiln. This section constitutes the preheating zone of the tunnel kiln. Cold air is blown into the tail of the tunnel kiln to cool the products in the last section of the tunnel kiln. After the blown cold air flows through the products and is heated, this section constitutes the cooling zone of the tunnel kiln.

[0003] The outlet temperature of existing tunnel kilns is still very high, so that most of the heat energy is directly discharged into the air, resulting in a waste of energy and heat. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and to provide a flue gas circulation energy-saving tunnel kiln.

[0005] A flue gas circulation energy-saving tunnel kiln, which comprises: a preheating kiln section 1, a firing kiln section 2, a cooling kiln section 3, a first flue gas circulation device, a second flue gas circulation device, and a burner 6; the preheating kiln section 1, the firing kiln section 2 and the cooling kiln section 3 are sealed and connected in sequence; the burner 6 main engine is connected with a top heat exchange plate 61 and two side wall heat exchange plates 62; the top heat exchange plate 61 is arranged at the top of the inner side of the firing kiln section 2, and the side wall heat exchange plates 62 are arranged on the side walls on both sides of the middle of the firing kiln section 2; the first flue gas circulation device first air inlet 41, the first induced draft fan 42, the first air supply pipe 43, the first air supply fan 44, and the preheating air outlet 45; the first air inlet 41 is arranged at the top between the feeding side of the firing kiln section 2 and the heat exchange plate 61; the preheating air outlet 45 is arranged at the top of the preheating kiln section 1; the first air inlet 41 passes through the first induced draft fan in sequence 42. The first air supply pipe 43 and the first air supply fan 44 are connected with the preheating air outlet 45; the second smoke gas circulation device comprises: a cooling fan 51, a second induced draft port 52, a second induced draft fan 53, a second air supply pipe 54, a third induced draft port 55 and a smoke filter 56; the cooling fan 51 is arranged at the bottom of the kiln of the cooling kiln section 3; the wind direction of the cooling fan 51 is upward; the second induced draft port 52 is arranged at the top of the cooling kiln section 3 opposite to the cooling fan 51; the third induced draft port 55 is arranged at the top between the top heat exchange plate 61 and the discharge side of the firing kiln section 2; the second induced draft port 52 is connected with the smoke filter 56 pipeline in sequence through the second induced draft fan 53, the second air supply pipe 54 and the smoke filter 56 pipeline; the third induced draft port 55 is connected with the smoke filter 56 pipeline; the smoke filter 56 filters and removes the smoke in the kiln before discharging the smoke.

[0006] A feeding kiln door 11 is provided on the feeding side of the preheating kiln section 1, and a first air curtain 71 is provided between the feeding kiln door 11 and the preheating air outlet 45; a second air curtain 72 is provided between the preheating air outlet 45 and the firing kiln section 2; the first air curtain 71 and the second air curtain 72 allow the preheating hot air discharged from the preheating air outlet 45 to circulate in the preheating kiln section 1.

[0007] The outlet end of the cooling kiln section 3 is provided with a discharge kiln door 31; the tops of both ends of the cooling kiln section 3 are respectively provided with a third air curtain 73 and a fourth air curtain 74; the air outlet direction of the third air curtain 73 is vertically downward; the air outlet direction of the fourth air curtain 74 is toward the firing kiln section 2, and the fourth air curtain 74 circulates the waste heat in the cooling kiln section 3 toward the firing kiln section 2.

[0008] The present technical scheme provides a flue gas circulation energy-saving tunnel kiln, which comprises: a preheating kiln section 1, a firing kiln section 2, a cooling kiln section 3, a first flue gas circulation device, a second flue gas circulation device, and a burner 6; the preheating kiln section 1, the firing kiln section 2 and the cooling kiln section 3 are sealed and connected in sequence; the burner 6 is arranged in the firing kiln section 2; the first flue gas circulation device introduces the smoke in the firing kiln section 2 into the preheating kiln section 1 to preheat the ingredients; the wind curtains arranged on the tops of both sides of the preheating kiln section 1 allow the preheated hot air to circulate in the preheating kiln section 1; the fired materials are cooled in the cooling kiln section 3, and the cooling smoke in the cooling kiln section 3 and the exhaust smoke in the firing kiln section 2 are filtered through a smoke cooling filter before the smoke is discharged; the high-temperature smoke in the firing kiln section 2 is introduced into the preheating kiln section 1 to preheat the ingredients, and the smoke circulation is energy-saving, thereby reducing the energy consumption of the burner, and the smoke is cooled and impurities are removed to reduce environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the overall schematic diagram of a flue gas circulation energy-saving tunnel kiln;

[0010] Figure 2 It is a schematic diagram of the internal structure of a flue gas circulation energy-saving tunnel kiln;

[0011] In the figure: 1, preheating kiln section, 11, feeding kiln door, 2, firing kiln section, 3, cooling kiln section, 31, discharging kiln door, 41, first induced air outlet, 42, first induced draft fan, 43, first air supply duct, 44, first air supply fan, 45, preheating air outlet, 51, cooling fan, 52, second induced air outlet, 53, second induced draft fan, 54, second air supply duct, 55, third induced air outlet, 56, smoke filter, 6, burner, 61, top heat exchange plate, 62, side wall heat exchange plate, 71, first air curtain, 72, second air curtain, 73, third air curtain, 74, fourth air curtain. DETAILED DESCRIPTION

[0012] The technical scheme will be further described clearly and completely below in conjunction with the accompanying drawings of the technical scheme. The described embodiments are only a part of the technical scheme, not all of the embodiments. Based on the technical scheme, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Example

[0013] See also Figure 1-2 As shown, a flue gas circulation energy-saving tunnel kiln comprises: a preheating kiln section 1, a firing kiln section 2, a cooling kiln section 3, a first flue gas circulation device, a second flue gas circulation device, and a burner 6;

[0014] The preheating kiln section 1, the firing kiln section 2 and the cooling kiln section 3 are sealed and connected in sequence.

[0015] The first flue gas circulation device includes: a first induced air port 41 , a first induced air fan 42 , a first air supply pipe 43 , a first air supply fan 44 , and a preheating air outlet 45 .

[0016] The second flue gas circulation device includes: a cooling fan 51 , a second air inlet 52 , a second induced draft fan 53 , a second air supply pipe 54 , a third air inlet 55 , and a smoke filter 56 .

[0017] The burner 6 main unit is connected to a top heat exchange plate 61 and two side wall heat exchange plates 62; the top heat exchange plate 61 is arranged on the top inside the firing kiln section 2, and the side wall heat exchange plates 62 are arranged on both side walls in the middle of the firing kiln section 2.

[0018] The first air inlet 41 is arranged at the top between the feeding side of the firing kiln section 2 and the heat exchange plate 61, and the first air inlet 41 is connected to the preheating air outlet 45 through the first induced draft fan 42, the first air supply pipe 43, and the first air supply fan 44 in sequence; the preheating air outlet 45 is arranged at the top of the preheating kiln section 1;

[0019] A feeding kiln door 11 is provided on the feeding side of the preheating kiln section 1, and a first air curtain 71 is provided between the feeding kiln door 11 and the preheating air outlet 45; a second air curtain 72 is provided between the preheating air outlet 45 and the firing kiln section 2; the first air curtain 71 and the second air curtain 72 enable the preheating hot air discharged from the preheating air outlet 45 to generate hot air circulating toward the center in the preheating kiln section 1, and the circulating hot air preheats the ingredients to be fired.

[0020] The cooling fan 51 is arranged at the bottom of the kiln of the cooling kiln section 3; the wind direction of the cooling fan 51 is upward; the second air induced opening 52 is arranged at the top of the cooling kiln section 3 opposite to the cooling fan 51; the second air induced opening 52 is connected through the second induced draft fan 53, the second air supply pipe 54 and the smoke filter 56 pipeline in sequence; the third air induced opening 55 is arranged at the top between the top heat exchange plate 61 and the discharge side of the firing kiln section 2; the third air induced opening 55 is connected with the smoke filter 56 pipeline; that is, the air induced openings provided on the top wall of the discharge side of the firing kiln section 2 and the top of the cooling kiln section 3 are connected with the smoke filter 56 pipeline; the smoke filter 56 filters and removes impurities in the kiln before discharging the smoke.

[0021] The outlet end of the cooling kiln section 3 is provided with a discharging kiln door 31; the tops of both ends of the cooling kiln section 3 are respectively provided with a third air curtain 73 and a fourth air curtain 74; the air outlet direction of the third air curtain 73 is vertically downward, and the vertical downward air outlet of the third air curtain 73 can reduce the heat of the firing kiln section 2 from escaping into the cooling kiln section 3; the air outlet direction of the fourth air curtain 74 is toward the firing kiln section 2, and the fourth air curtain 74 circulates the waste heat in the cooling kiln section 3 toward the firing kiln section 2.

Claims

1. A flue gas circulation energy-saving tunnel kiln, comprising: A preheating kiln section (1), a firing kiln section (2), a cooling kiln section (3), a first flue gas circulation device, a second flue gas circulation device, and a burner (6); characterized in that: the preheating kiln section (1), the firing kiln section (2), and the cooling kiln section (3) are sealed and connected in sequence; the burner (6) main unit is connected to a top heat exchange plate (61) and two side wall heat exchange plates (62); the top heat exchange plate (61) is arranged at the top of the inner side of the firing kiln section (2), and the side wall heat exchange plate (62) is arranged at the inner side of the firing kiln section (2). The first flue gas circulation device comprises a first induced draft port (41), a first induced draft fan (42), a first air supply pipe (43), a first air supply fan (44), and a preheating air outlet (45); the first induced draft port (41) is arranged at the top between the feeding side of the firing kiln section (2) and the heat exchange plate (61); the preheating air outlet (45) is arranged at the top of the preheating kiln section (1); the first induced draft port (41) passes through the first induced draft fan (42), the first air supply pipe (43), the first air supply fan (44), and the preheating air outlet (45) in sequence. The air duct (43) and the first air supply fan (44) are connected to the preheating air outlet (45); the second smoke gas circulation device comprises: a cooling fan (51), a second air induction port (52), a second air induction fan (53), a second air supply duct (54), a third air induction port (55), and a smoke filter (56); the cooling fan (51) is arranged at the bottom of the kiln of the cooling kiln section (3); the wind direction of the cooling fan (51) is upward; the second air induction port (52) is arranged at a position adjacent to the cooling fan ( The third air inlet (55) is arranged at the top between the top heat exchange plate (61) and the discharge side of the firing kiln section (2); the second air inlet (52) is connected in sequence through the second induced draft fan (53), the second air supply pipe (54) and the smoke filter (56) pipeline; the third air inlet (55) is connected to the smoke filter (56) pipeline; the smoke filter (56) cools and filters the smoke in the kiln to remove impurities before discharging the smoke.

2. A flue gas circulation energy-saving tunnel kiln according to claim 1, characterized in that: The feed side of the preheating kiln section (1) is provided with a feed kiln door (11), and a first air curtain (71) is provided between the feed kiln door (11) and the preheating air outlet (45); a second air curtain (72) is provided between the preheating air outlet (45) and the firing kiln section (2); the first air curtain (71) and the second air curtain (72) allow the preheating hot air discharged from the preheating air outlet (45) to circulate in the preheating kiln section (1).

3. The flue gas circulation energy-saving tunnel kiln according to claim 1, characterized in that: The outlet end of the cooling kiln section (3) is provided with a discharge kiln door (31); the tops of both ends of the cooling kiln section (3) are respectively provided with a third air curtain (73) and a fourth air curtain (74); the air outlet of the third air curtain (73) is directed vertically downward; the air outlet of the fourth air curtain (74) is directed toward the firing kiln section (2), and the fourth air curtain (74) circulates the waste heat in the cooling kiln section (3) toward the firing kiln section (2).

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