Efficient water film dust removal and heat recovery system for tail gas of spray drying tower

Abstract

The utility model provides an efficient water film dust removal heat recovery system for tail gas of a spray drying tower, which comprises a heat comprehensive absorption tower, one side of the heat comprehensive absorption tower is connected with an air inlet filter and an exhaust fan, the other side of the heat comprehensive absorption tower is connected with a hot water pump, the exhaust fan is connected with a cyclone separator arranged in the spray drying tower through a waste hot air pipeline, and the cyclone separator is connected with a hot water pump. A water film absorption tower and a dividing wall hot water and cold air heat exchanger are arranged in the middle of the heat comprehensive absorption tower from inside to outside, a waste hot air inlet pipe, a cold air inlet pipe and a preheated air outlet pipe are connected to the side wall of the heat comprehensive absorption tower, and the water film absorption tower is connected with an exhaust fan through the waste hot air inlet pipe. The dividing wall hot water and cold air heat exchanger is connected with an air inlet filter through a cold air inlet pipe. According to the utility model, waste hot air containing dust is washed and recycled, and cold air is cooled after the washing liquid is heated, so that the purpose of double-phase utilization and recycling is achieved, the heat efficiency is high, the operation is simple and convenient, and the circulating continuous operation can be carried out.

Description

TECHNICAL FIELD

[0001] The utility model relates to food and medicine and chemical industry drying technical field especially relates to a spray drying tower tail gas high -efficient water film dust removal heat recovery system. BACKGROUND

[0002] At present, the production mode of direct exhaust gas emission is often adopted in the spray drying production process, the exhaust temperature is 80-95 DEG C, or even higher. Because the drying suitable temperature of different materials is different, the exhaust temperature of part of easy moisture absorption material spray drying is even as high as 100 DEG C or above, which leads to high energy consumption of the drying method. In addition, the exhaust tail gas contains a small amount of dust or odor, which will cause adverse effects on the environment if directly discharged.

[0003] Therefore, how to reasonably carry out heat recovery and dust recovery, make the exhaust heat of waste heat wind reach full utilization, and also make the waste heat wind be purified and discharged is a technical problem to be solved at present.

[0004] Therefore, the utility model is provided. UTILITY MODEL CONTENT

[0005] The utility model discloses a spray drying tower tail gas high -efficient water film dust removal heat recovery system, and combines the heat recovery of waste heat wind and the purification of waste heat wind as a whole operation system, and effectively recycles and utilizes the heat and micro dust of waste heat wind generated in the spray drying process.

[0006] The utility model discloses a spray drying tower tail gas high -efficient water film dust removal heat recovery system, it includes: heat comprehensive absorption tower, heat comprehensive absorption tower one side connects the air inlet filter and exhaust fan, the other side connects hot water pump, exhaust fan is connected with the cyclone separator that sets up in the spray drying tower through waste heat wind pipeline, the middle part of heat comprehensive absorption tower is outward respectively arranged with water film absorption tower and interval wall hot water cold wind heat exchanger, is connected with the setting waste heat wind import pipe, cold wind import pipe and preheated air outlet pipe on the lateral wall of heat comprehensive absorption tower, water film absorption tower is connected with exhaust fan through waste heat wind import pipe, interval wall hot water cold wind heat exchanger is connected with air inlet filter through cold wind import pipe.

[0007] Further, the water film absorption tower is a vertical cylinder structure, a water overflow hole is formed in the upper end cylinder, a plurality of guide plates are arranged in the vertical direction in the middle part, and a collection cone is connected to the lower end. The water overflow hole is connected with the tube side of the water film absorption tower and the interval wall hot water cold wind heat exchanger. The water in the water film absorption tower after heat exchange is collected into the collection cone. The water in the collection cone enters the hot water pump. The water in the hot water pump is introduced into the tube side. The particulate matter in the collection cone is discharged by the hot water pump.

[0008] Further, a process cold water pipe is also connected to the collecting cone.

[0009] Further, the partition wall hot water cold air heat exchanger further comprises a shell pass connected with a cold air inlet pipe and a preheated air outlet pipe, the cold air inlet pipe is arranged at the upper part of the heat comprehensive absorption tower, and the preheated air outlet pipe is arranged at the lower part of the heat comprehensive absorption tower.

[0010] Further, a tail gas pipe and a clean air outlet are arranged at the top of the heat comprehensive absorption tower, after the waste heat air in the heat comprehensive absorption tower is washed and cooled by water, the waste heat air is discharged from the clean air outlet through the tail gas pipe.

[0011] Further, a reinforcing skirt is arranged at the bottom of the heat comprehensive absorption tower.

[0012] Further, a hot air drying tower is arranged at the top of the spray drying tower, the hot air drying tower is connected with a hot air heater, and air in the hot air heater is introduced by an air inlet machine.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. The water film absorption tower is used, the waste heat air enters the water film absorption tower through the waste heat air inlet pipe, the waste heat air passes through the guide plate and the baffle, contacts the circulating water from top to bottom, and mass transfer and heat transfer are carried out, the circulating water absorbs part of the heat of the waste heat air and the temperature is increased, and the waste heat air is cooled by the circulating water, the circulating water absorbs the small particles in the waste heat air, the purpose of waste heat air purification is achieved, and the waste heat air after purification and cooling is discharged into the atmosphere through the tail gas pipe.

[0015] 2. The cold water in the utility model is introduced into the process water inlet pipe and is added intermittently according to the need, when working, the inside of the collecting cone is hot water, the hot water enters the heat exchange pipe pass of the partition wall hot water cold air heat exchanger through the hot water pump, the water in the heat exchange pipe pass exchanges heat with the cold air introduced into the cold air inlet pipe, the purpose of preheating and temperature rising is achieved, the hot water is cooled and enters the water film absorption tower through the water overflow hole for recycling, the purpose of heat absorption and release is achieved, and the energy-saving effect is high.

[0016] 3. The cold air introduced into the partition wall hot water cold air heat exchanger shell pass is filtered through the air inlet filter, and the cleanliness of the introduced cold air is ensured.

[0017] 4. The hot water in the pipe pass is cooled through heat exchange, enters the water film absorption tower through the water overflow hole arranged at the upper part, and is recycled to absorb heat and fine dust particles, when a certain solid concentration is reached, the hot water is discharged through the hot water pump, process cold water is introduced for recycling. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the spray drying tower tail gas efficient water film dust removal heat recovery system of the utility model.

[0019] Figure 2 It is a structure schematic view of the heat comprehensive absorption tower of the utility model.

[0020] Among them, 1 is an air inlet fan; 2 is a hot air heater; 3 is a hot air drying tower; 4 is a spray drying tower; 5 is a cyclone separator; 6 is an air exhaust fan; 7 is a waste heat air inlet pipe; 8 is a heat comprehensive absorption tower; 81 is a clean air outlet; 82 is a tail gas pipe; 83 is a water overflow hole; 84 is a guide plate; 85 is a shell side; 86 is a tube side; 87 is a collection cone; 88 is a reinforced skirt; 9 is a hot water pump; 10 is an air inlet filter; 11 is a cold air inlet pipe; 12 is a preheated air outlet pipe; and 13 is a process cold water pipe. DETAILED DESCRIPTION

[0021] The embodiments of the utility model will be described in detail below in combination with examples, but those skilled in the art will understand that the following examples are only used for illustrating the present application and should not be regarded as limiting the scope of the utility model.

[0022] According to the embodiments of the utility model, the spray drying tower tail gas efficient water film dust removal heat recovery system of the utility model, as shown in the figure, comprises an air inlet fan 1, a hot air heater 2, a hot air drying tower 3, a spray drying tower 4, a cyclone separator 5, an air exhaust fan 6, a waste heat air inlet pipe 7, a heat comprehensive absorption tower 8 and a hot water pump 9. Figures 1-2 According to the arrangement direction, the air inlet fan 1, the hot air heater, the hot air drying tower 3, the spray drying tower 4, the cyclone separator 5, the air exhaust fan 6, the waste heat air inlet pipe 7 and the heat comprehensive absorption tower 8 are sequentially arranged from right to left according to the hot air entering order. Figure 1

[0023] According to the embodiments of the utility model, the air inlet filter 10 is connected through the cold air inlet pipe 11 on the right upper portion of the heat comprehensive absorption tower 8, the air exhaust fan 6 is connected through the waste heat air inlet pipe 7 on the right lower portion of the heat comprehensive absorption tower 8, and the preheated air outlet pipe 12 is further arranged on the right lower portion of the heat comprehensive absorption tower 8, and the hot air after heat exchange is discharged through the preheated air outlet pipe 12.

[0024] ​According to the embodiment of the utility model, the middle part of the heat comprehensive absorption tower 8 is provided with a water film absorption tower and a partition wall hot water cold air heat exchanger from inside to outside, the water film absorption tower is vertical cylinder structure, a plurality of water overflow holes 83 are formed in the upper end side wall of the cylinder, a plurality of guide plates 84 are arranged in the vertical direction in the middle part, the guide plates 84 on both sides are arranged in cross type, and the lower end is connected with a collection cone 87. The water overflow hole 83 connects the water film absorption tower and the pipe passage 86 of the partition wall hot water cold air heat exchanger, the hot water in the pipe passage 86 of the partition wall hot water cold air heat exchanger is heat exchanged and cooled by the cold air in the shell passage 85, and then enters the water film absorption tower through the water overflow hole 83. The water in the water film absorption tower is collected into the collection cone 87, the water in the collection cone 87 enters the hot water pump 9, the water in the hot water pump 9 is introduced into the pipe passage 86, and the particulate in the collection cone 87 is discharged through the hot water pump 9. The tail gas pipe 82 and the clean air outlet 81 are arranged at the top of the heat comprehensive absorption tower 8, the waste heat air in the heat comprehensive absorption tower 8 is cooled by water washing, and then is discharged from the clean air outlet 81 through the tail gas pipe 82. Specifically, the waste heat air enters the water film absorption tower through the waste heat air inlet pipe 7, the waste heat air passes through the guide plate 84 and is deflected, contacts the circulating water from top to bottom to carry out mass transfer and heat transfer, the circulating water is heated after absorbing part of the heat of the waste heat air, and then flows into the lower collection cone 87, the waste heat air is cooled after absorbing heat through the circulating water, the circulating water absorbs the small particles in the waste heat air to achieve the purpose of waste heat air purification, and the waste heat air after purification and cooling is discharged into the atmosphere through the tail gas pipe 82.

[0025] According to the embodiment of the utility model, the partition wall hot water cold air heat exchanger further includes a shell passage 85, the shell passage 85 is connected with a cold air inlet pipe 11 and a preheated air outlet pipe 12, the cold air inlet pipe 11 is arranged at the upper part of the heat comprehensive absorption tower 8, and the preheated air outlet pipe 12 is arranged at the lower part of the heat comprehensive absorption tower 8. The process cold water pipe 13 is further connected to the collection cone 87. Specifically, the cold water in the utility model enters the process water inlet pipe 13 and is added intermittently according to needs, when working, the inside of the collection cone 87 is hot water, enters the heat exchange pipe passage 86 of the partition wall hot water cold air heat exchanger through the hot water pump 9, the water in the heat exchange pipe passage 86 is heat exchanged with the cold air entering the shell passage 85 through the cold air inlet pipe 11 to achieve the purpose of preheating and temperature rising, the hot water is cooled and then enters the water film absorption tower to be recycled, thereby achieving the purpose of heat absorption and release, and having high energy-saving effect.

[0026] According to the embodiment of the utility model, the heat comprehensive absorption tower 8 is combined integrally by the water film absorption tower at the inside and the partition wall hot water cold air heat exchanger at the outside. The inside of the partition wall hot water cold air heat exchanger is the tube pass 86 and shell pass 85 of the heat exchanger, the shell pass 85 is the cold air pass outside the tube, the cold air enters the shell pass 85 from the cold air inlet pipe 11 and exchanges heat with the hot water of the tube pass 86, to reach the purpose of preheating the cold air.

[0027] According to the embodiment of the utility model, when the hot water in the tube pass 86 is cooled by heat exchange and then enters the water film absorption tower through the water overflow hole 83 arranged at the upper portion to absorb heat and fine dust particles, when reaching a certain solid concentration, is discharged by the hot water pump 9, and then the process cold water is supplemented to enter to work in a cycle.

[0028] According to the embodiment of the utility model, the heat comprehensive absorption tower 8 works independently in two cavities, and the waste hot air is discharged outside through the tail gas pipe 4 arranged at the top after being washed by water and cooled.

[0029] According to the embodiment of the utility model, the bottom of the heat comprehensive absorption tower 8 is provided with a reinforced skirt 88 for bearing support, and the reinforced skirt 88 is welded and reinforced with the collection cone 87.

[0030] The utility model discloses a kind of spray drying tower tail gas high-efficiency water film dust removal heat recovery system, for the high exhaust temperature and exhaust dust recovery in conventional operation in spray drying industry, first, waste hot air containing dust is washed and recovered, and the water washing liquid is heated and then preheated to reach the purpose of double-phase utilization recovery.Cold air heat exchanger is sent into partition wall hot water by hot water pump 9 after water washing liquid temperature rises, and heat exchange is carried out with cold air, to reach the purpose of preheating cold air and improving cold air temperature, to reach the purpose of energy saving.Meanwhile, according to the water washing liquid operation, when water washing liquid absorbs a certain amount of fine dust, it can be discharged by hot water pump 9, and sent into front process water recovery system, to achieve the recycling of water washing liquid, at this time, fresh process cold water is needed to be supplemented to replace cycle, so as to achieve the purpose of full recycling.

[0031] In the utility model, unless there are specific provisions and limitations, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements or the interaction between two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0032] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific feature, structure, material or characteristic described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without mutual contradiction.

Claims

1. A spray drying tower tail gas high efficiency water film dust removal heat recovery system, characterized in that, The utility model relates to a kind of heat comprehensive absorption tower (8), heat comprehensive absorption tower (8) is connected with air inlet filter (10) and exhaust fan (6) on one side, and is connected with hot water pump (9) on the other side, exhaust fan (6) is connected with cyclone (5) arranged in spray drying tower (4) by waste heat air pipe, The middle part of the heat comprehensive absorption tower (8) is provided with a water film absorption tower and a partition hot water cold air heat exchanger from inside to outside, respectively, and a waste heat air inlet pipe (7), a cold air inlet pipe (11) and a preheated air outlet pipe (12) are connected and arranged on the side wall of the heat comprehensive absorption tower (8). The water film absorption tower is connected with the exhaust fan (6) through the waste heat air inlet pipe (7), and the partition hot water cold air heat exchanger is connected with the air inlet filter (10) through the cold air inlet pipe (11). The water film absorption tower is a vertical cylindrical structure, a water overflow hole (83) is formed in the upper end cylinder, a plurality of guide plates (84) are arranged in the middle part in the vertical direction, and a collection cone (87) is connected to the lower end, 2. The spray-drying column off-gas high-efficiency water-membrane dust-removal heat-recovery system according to claim 1, characterized in that, The water overflow hole (83) communicates the tube side (86) of the water film absorption tower and the partition hot water cold air heat exchanger, the water in the water film absorption tower after heat exchange is collected into the collection cone (87), the water in the collection cone (87) enters the hot water pump (9), the water in the hot water pump (9) is introduced into the tube side (86), and the particulate matter in the collection cone (87) is discharged through the hot water pump (9). A process cold water pipe (13) is also connected to the collection cone (87).

3. The spray-drying column tail gas high-efficiency water film dust removal heat recovery system according to claim 2, characterized in that, The partition hot water cold air heat exchanger also includes a shell side (85), the shell side (85) is connected with the cold air inlet pipe (11) and the preheated air outlet pipe (12), the cold air inlet pipe (11) is arranged in the upper part of the heat comprehensive absorption tower (8), and the preheated air outlet pipe (12) is arranged in the lower part of the heat comprehensive absorption tower (8).

4. The spray-drying column tail gas high-efficiency water film dust removal heat recovery system according to claim 1, characterized in that, A tail gas pipe (82) and a clean air outlet (81) are arranged at the top of the heat comprehensive absorption tower (8), and the waste heat air in the heat comprehensive absorption tower (8) is cooled by water washing and then discharged from the clean air outlet (81) through the tail gas pipe (82).

5. The spray-drying column tail gas high-efficiency water film dust removal heat recovery system according to claim 1, characterized in that, A reinforcing skirt (88) is arranged at the bottom of the heat comprehensive absorption tower (8).

6. The spray-drying column tail gas high-efficiency water film dust removal heat recovery system according to claim 1, characterized in that, A hot air drying tower (3) is arranged at the top of the spray drying tower (4), the hot air drying tower (3) is connected with a hot air heater (2), and the air in the hot air heater (2) is introduced by an air inlet fan (1).

7. The spray-drying column tail gas high-efficiency water film dust removal heat recovery system according to claim 1, characterized in that, ​

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