Preheater

Abstract

The utility model discloses a preheater which comprises heat exchange units, heat exchange unit connecting pipes and an air inlet pipe, at least two heat exchange units are connected together, smoke ports of the adjacent heat exchange units are connected through the heat exchange unit connecting pipes, and the air inlet pipe is connected to the heat exchange unit connecting pipes. The heat exchange unit comprises a heat exchange box, three hot smoke pipe sets, cold air ports and connecting pipes, the cold air ports are connected to the two ends of the heat exchange box, the three hot smoke pipe sets penetrate through the heat exchange box, the adjacent hot smoke pipe sets are connected through the connecting pipes, and the hot air ports are connected to the ends, away from the connecting pipes, of the two hot smoke pipe sets. The hot smoke pipe set comprises a heat exchange pipe, an upper sealing connecting device, a lower sealing connecting device and an ash removing device. The preheater is simple in structure, convenient to use and practical, the heat exchange efficiency is improved by arranging the two heat exchange units, meanwhile, the hot smoke amount is increased by introducing smoke into the air inlet pipe, and the air heating efficiency is guaranteed under the condition that the air inflow amount is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of air preheating, and in particular relates to a preheater. Background Art

[0002] The preparation process of n-methylpyrrolidone is divided into three steps. The first step is the addition reaction to form N-methyl-hydroxybutyramide (NMH), the second step is the cyclization of NMH, and the third step is the complete conversion of NMH to NMP. The process reaction temperature is controlled above 150 degrees. According to different conditions, the reaction needs to be controlled at different temperatures. The production of steam generally uses a boiler, and is equipped with a preheater to increase the temperature of the boiler intake air; the preheater uses the flue gas in the flue at the tail end of the boiler to preheat the air before entering the boiler to a certain temperature of the heating surface through the internal heat sink. It is used to improve the heat exchange performance of the boiler and reduce energy consumption; the biggest disadvantage of the preheater is that dust easily blocks the heat exchange tube. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a preheater which is simple in structure, convenient and practical. The heat exchange efficiency is improved by arranging two sets of heat exchange units, and the flue gas is introduced into the air intake pipe at the same time, so as to ensure the heating efficiency of the air while increasing the air inflow.

[0004] A preheater comprises a heat exchange unit, a heat exchange unit connecting pipe and an air intake pipe, at least two groups of the heat exchange units are connected together, the smoke outlets of adjacent heat exchange units are connected through the heat exchange unit connecting pipe, and the air intake pipe is connected to the heat exchange unit connecting pipe; the heat exchange unit comprises a heat exchange box, a hot smoke pipe group, a cold air outlet and a connecting pipe, both ends of the heat exchange box are connected with the cold air outlet, three groups of the hot smoke pipe groups run through the heat exchange box, adjacent hot smoke pipe groups are connected through a connecting pipe, and the ends of two hot smoke pipe groups away from the connecting pipe are connected with the hot air outlet; the hot smoke pipe group comprises a heat exchange pipe, an upper sealing connection device, a lower sealing connection device and a dust cleaning device, a plurality of the heat exchange pipes run through the heat exchange box and the two ends are respectively connected to the upper sealing connection device and the lower sealing connection device, and the two ends of the dust cleaning device are respectively arranged in the upper sealing connection device and the lower sealing connection device and in the heat exchange pipe.

[0005] Preferably, the upper sealing connection device and the lower sealing connection device both include a lower sealing connection plate, an upper sealing connection plate and a sealing shell ring, and the sealing shell ring is connected between the lower sealing connection plate and the upper sealing connection plate.

[0006] Preferably, the cleaning device includes an adjusting frame, a steel wire rope, an adjusting bolt, a limiting rod and a lower adjusting frame. The adjusting frame is arranged in a sealing shell ring of an upper sealing connecting device and is connected to one end of the steel wire rope. The lower adjusting frame is arranged in a sealing shell ring of a lower sealing connecting device and is connected to the other end of the steel wire rope. One end of several adjusting bolts passes through the lower sealing connecting plate and is connected to the adjusting frame. Both ends of several limiting rods are respectively connected to the lower sealing connecting plate and the upper sealing connecting plate and pass through the lower adjusting frame.

[0007] Preferably, a limiting block is provided on the limiting rod.

[0008] Preferably, a pendulum ball is provided on the steel wire rope.

[0009] Beneficial effects:

[0010] (1) The preheater of the utility model has a simple structure, is convenient and practical, and improves the heat exchange efficiency by arranging two sets of heat exchange units. At the same time, the flue gas is introduced into the air intake pipe to increase the amount of hot flue gas, thereby ensuring the heat exchange efficiency of the air while increasing the air inflow.

[0011] (2) A preheater of the utility model adjusts the tightness of the steel wire rope by adjusting the bolt, so that the flue gas flow causes the pendulum ball to swing, so that the steel wire rope swings in the heat exchange tube, thereby reducing the dust accumulation in the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural schematic diagram of a preheater;

[0013] Figure 2 It is a structural schematic diagram of a heat exchange unit;

[0014] Figure 3 It is a structural schematic diagram of the hot smoke pipe group;

[0015] 1-heat exchange unit, 11-heat exchange box, 12-hot smoke pipe group, 13-cold air outlet, 14-connecting pipe, 15-hot air outlet, 16-heat exchange pipe, 17-upper sealing connection device, 18-lower sealing connection device, 19-ash cleaning device, 110-lower sealing connection plate, 111-upper sealing connection plate, 112-sealing shell ring, 113-adjusting frame, 114-wire rope, 115-adjusting bolt, 116-limiting block, 117-limiting rod, 118-lower adjusting frame, 119-swinging ball, 2-connecting pipe of heat exchange unit, 3-intake pipe. DETAILED DESCRIPTION

[0016] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0017] Example 1

[0018] like Figures 1 to 3As shown; a preheater, comprising a heat exchange unit 1, a heat exchange unit connecting pipe 2 and an air intake pipe 3, at least two groups of the heat exchange units 1 are connected together, the smoke outlets of adjacent heat exchange units 1 are connected through the heat exchange unit connecting pipe 2, and the air intake pipe 3 is connected to the heat exchange unit connecting pipe 2; the heat exchange unit 1 comprises a heat exchange box 11, a hot smoke pipe group 12, a cold air outlet 13 and a connecting pipe 14, both ends of the heat exchange box 11 are connected to the cold air outlet 13, the three groups of hot smoke pipe groups 12 penetrate the heat exchange box 11, and the adjacent hot smoke pipe groups The heat exchange box 11 is connected to the heat exchange box 11 by a connecting pipe 14, and the ends of the two hot smoke pipe groups 12 away from the connecting pipe 14 are connected to a hot air outlet 15; the hot smoke pipe group 12 includes a heat exchange pipe 16, an upper sealing connection device 17, a lower sealing connection device 18 and a dust cleaning device 19, a plurality of the heat exchange pipes 16 pass through the heat exchange box 11 and the two ends are respectively connected to the upper sealing connection device 17 and the lower sealing connection device 18, and the two ends of the dust cleaning device 19 are respectively arranged in the upper sealing connection device 17 and the lower sealing connection device 18 and arranged in the heat exchange box The upper sealing connection device 17 and the lower sealing connection device 18 both include a lower sealing connection plate 110, an upper sealing connection plate 111 and a sealing shell ring 112, and the sealing shell ring 112 is connected between the lower sealing connection plate 110 and the upper sealing connection plate 111; the dust cleaning device 19 includes an adjustment frame 113, a steel wire rope 114, an adjustment bolt 115, a limit rod 117 and a lower adjustment frame 118, and the adjustment frame 113 is arranged in the sealing shell ring 112 of the upper sealing connection device 17 and connected to the steel wire rope 114 is connected at one end, the lower adjustment frame 118 is arranged in the sealing shell ring 112 of the lower sealing connection device 18 and is connected to the other end of the wire rope 114, one end of a plurality of the adjusting bolts 115 passes through the lower sealing connection plate 110 and is connected to the adjustment frame 113, two ends of a plurality of the limiting rods 117 are respectively connected to the lower sealing connection plate 110 and the upper sealing connection plate 111 and pass through the lower adjustment frame 118; a limiting block 116 is arranged on the limiting rod 117; and a swing ball 119 is arranged on the wire rope 114.

[0019] The flue gas enters the hot smoke pipe group 12 through the hot air port 15, and the flue gas in the adjacent hot smoke pipe group 12 is guided through the connecting pipe 14 and then discharged through the hot air port 15 at the other end. The hot air port 15 of the adjacent heat exchange unit 1 is connected to guide the flue gas through the heat exchange unit connecting pipe 2, and the air intake pipe 3 introduces the flue gas again to ensure the air heat exchange temperature; the air is introduced into the heat exchange box 11 through the cold air port 13, and then exchanges heat with the heat exchange pipe 16 and then is discharged from the cold air port 13 at the other end into the furnace cavity; the flue gas passes through the upper The sealing shell ring 112 of the sealing connection device 17 is introduced into the heat exchange tube 16, and then the sealing shell ring 112 of the lower sealing connection device 18 is introduced through the heat exchange tube 16; the tightness of the steel wire rope 114 is controlled by adjusting the adjusting bolt 115, and it is necessary to avoid the steel wire rope 114 from contacting the inner wall of the heat exchange tube 16; when the heat exchange tube 16 discharges the flue gas, the flow of the flue gas will blow the pendulum ball 119 to swing, and the pendulum ball 119 will drive the steel wire rope 114 to swing at the same time, so as to achieve the purpose of cleaning the dust accumulated on the inner wall of the heat exchange tube 16.

[0020] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modification and substitution of the present invention is also within the scope of the present invention. Therefore, the equivalent transformation and modification made without departing from the spirit and scope of the present invention are all within the scope of the present invention.

Claims

1. A preheater, characterized in that: The invention comprises a heat exchange unit (1), a heat exchange unit connecting pipe (2) and an air intake pipe (3), wherein at least two groups of the heat exchange units (1) are connected together, and the smoke outlets of adjacent heat exchange units (1) are connected via the heat exchange unit connecting pipe (2), and the air intake pipe (3) is connected to the heat exchange unit connecting pipe (2); the heat exchange unit (1) comprises a heat exchange box (11), a hot smoke pipe group (12), a cold air outlet (13) and a connecting pipe (14), both ends of the heat exchange box (11) are connected to the cold air outlet (13), three groups of the hot smoke pipe groups (12) penetrate the heat exchange box (11), and adjacent hot smoke pipe groups (12) are connected via a connecting pipe (14). The two hot smoke pipe groups (12) are connected by a connecting pipe (14), and one end of each of the two hot smoke pipe groups (12) away from the connecting pipe (14) is connected to a hot air outlet (15); the hot smoke pipe group (12) comprises a heat exchange pipe (16), an upper sealing connection device (17), a lower sealing connection device (18) and a dust cleaning device (19); a plurality of the heat exchange pipes (16) penetrate the heat exchange box (11) and the two ends are respectively connected to the upper sealing connection device (17) and the lower sealing connection device (18); the two ends of the dust cleaning device (19) are respectively arranged in the upper sealing connection device (17) and the lower sealing connection device (18) and are arranged in the heat exchange pipe (16).

2. A preheater according to claim 1, characterized in that: The upper sealing connection device (17) and the lower sealing connection device (18) both comprise a lower sealing connection plate (110), an upper sealing connection plate (111) and a sealing shell ring (112); the sealing shell ring (112) is connected between the lower sealing connection plate (110) and the upper sealing connection plate (111).

3. A preheater according to claim 2, characterized in that: The dust cleaning device (19) comprises an adjustment frame (113), a steel wire rope (114), an adjustment bolt (115), a limit rod (117) and a lower adjustment frame (118); the adjustment frame (113) is arranged in the sealing shell ring (112) of the upper sealing connection device (17) and is connected to one end of the steel wire rope (114); the lower adjustment frame (118) is arranged in the sealing shell ring (112) of the lower sealing connection device (18) and is connected to the other end of the steel wire rope (114); one end of a plurality of the adjustment bolts (115) passes through the lower sealing connection plate (110) and is connected to the adjustment frame (113); two ends of a plurality of the limit rods (117) are respectively connected to the lower sealing connection plate (110) and the upper sealing connection plate (111) and pass through the lower adjustment frame (118).

4. A preheater according to claim 3, characterized in that: A limiting block (116) is arranged on the limiting rod (117).

5. A preheater according to claim 4, characterized in that: The steel wire rope (114) is provided with a swing ball (119).

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