CN111536542A - Exhaust gas treatment system and furnace gas treatment method in tobacco production - Google Patents

Abstract

The invention relates to the technical field of tobacco shred production, and provides an exhaust treatment system and a furnace gas treatment method in tobacco shred production. Exhaust treatment system in pipe tobacco production includes: the first heat exchanger is internally provided with a first heat release passage and a first heat absorption passage for exchanging heat with the first heat release passage, two ends of the first heat release passage are respectively communicated with a furnace gas outlet of the combustion furnace and a first gas inlet of the first cleaning tower, and the first cleaning tower is also provided with a first gas outlet; a first liquid inlet structure and a first liquid outlet structure are arranged on the first cleaning tower; and a second heat release passage and a second heat absorption passage for exchanging heat with the second heat release passage are arranged in the second heat exchanger, and two ends of the second heat release passage are respectively communicated with the first liquid inlet structure and the first liquid outlet structure. The exhaust treatment system and the furnace gas treatment method in tobacco shred production provided by the invention have the advantages that the heat of the furnace gas is recovered by cooling, the furnace gas is cleaned, the number of system equipment is small, the structure is simple, and the cost is low.

Description

Exhaust gas treatment system and furnace gas treatment method in tobacco production

technical field

The invention relates to the technical field of shredded tobacco production, in particular to an exhaust gas treatment system and a furnace gas treatment method in shredded tobacco production.

Background technique

Dry ice (CO ₂ ) expanded shredded tobacco is widely used, which utilizes the sublimable, clean, non-toxic and safe properties of dry ice to process ordinary shredded tobacco into expanded shredded tobacco. The demand for expanded cut tobacco is large, the equipment is simple, the equipment cost is not high, and the operation is simple.

The production process of expanded shredded tobacco is as follows: tobacco raw materials are sliced, re-moisturized, stored, shredded, quantitatively weighed, and then periodically sent to the impregnator. , In the sublimator, the volume of the cut tobacco expands rapidly, and the expanded cut tobacco is separated from the process gas. The flue gas attached to the separated cut tobacco is pumped into the combustion furnace for incineration, and the soot contained in the flue gas is burned in the combustion furnace to generate waste gas. In addition, the combustion furnace is the main equipment for heating and flue gas treatment. The direct discharge of the furnace gas from the combustion furnace will carry dust and peculiar smell. The temperature of the discharged furnace gas is high, and the direct discharge will cause air pollution.

At the same time, in the production process of expanded cut tobacco, a moisture exhaust gas will also be generated. The moisture exhaust gas contains flue gas and particulate impurities, and the moisture exhaust gas has a peculiar smell. If it is directly discharged, it will also cause air pollution.

Expansion tobacco production lines in the tobacco industry use a large number of combustion furnace equipment, but there is no relevant report on the treatment of combustion furnace gas.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an exhaust gas treatment system in the production of shredded tobacco, which recovers the heat of the furnace gas by cooling down and cleans the furnace gas. The system has few equipments, simple structure and low cost.

The invention also provides a furnace gas treatment method.

The exhaust gas treatment system in tobacco production according to the embodiment of the first aspect of the present invention includes: a first heat exchanger, a first cleaning tower and a second heat exchanger,

The first heat exchanger is provided with a first heat release passage and a first heat absorption passage that exchanges heat with the first heat release passage, and both ends of the first heat release passage are respectively connected to the furnace gas of the combustion furnace. The outlet is communicated with the first gas inlet of the first cleaning tower, the first cleaning tower is also provided with a first gas outlet above the first gas inlet, and the first gas inlet is connected to the first gas inlet. The gas outlet is connected;

The first cleaning tower is provided with a first liquid inlet structure and a first liquid outlet structure, and the first liquid inlet structure is located above the first liquid outlet structure;

The second heat exchanger is provided with a second heat release passage and a second heat absorption passage for exchanging heat with the second heat release passage, and both ends of the second heat release passage are respectively connected to the first inlet and outlet. The liquid structure communicates with the first liquid outlet structure.

According to an embodiment of the present invention, it further includes a first fan disposed at the first gas outlet, the first fan is connected with a first fan frequency conversion linkage, and the furnace gas outlet is connected with a first pressure sensor, The first fan, the first fan frequency conversion linkage and the first pressure sensor are connected.

According to an embodiment of the present invention, the first cleaning tower is provided with a water bed assembly, the first liquid inlet structure feeds a first circulating liquid into the first cleaning tower, and the first circulating liquid is A water bed of a preset height is formed on the water bed assembly, and the furnace gas of the combustion furnace passes through the water bed from bottom to top to form air bubbles on the water bed.

According to an embodiment of the present invention, the water bed assembly includes a sieve plate and a water blocking plate connected to the sieve plate, the sieve plate is connected to the inner wall of the first cleaning tower, and the sieve plate is provided with Through holes, the height of the water blocking plate can be adjusted, and a falling water channel is formed between the water blocking plate and the inner wall of the first cleaning tower.

According to an embodiment of the present invention, at least two layers of the water bed assemblies are arranged in the first cleaning tower.

According to an embodiment of the present invention, the inlet pipeline and/or the outlet pipeline of the first heat absorption passage is provided with a regulating valve.

According to an embodiment of the present invention, a cooling tower is further included, and the second heat absorption passage is communicated with a cold water outlet of the cooling tower.

According to an embodiment of the present invention, it further includes a second cleaning tower and a third heat exchanger, the second gas inlet of the second cleaning tower is connected to the moisture exhaust gas outlet of the moisture exhaust structure, and the second gas inlet is connected to the upper part of the moisture exhaust gas outlet. The second gas outlet is connected; the second cleaning tower is provided with a second liquid inlet structure and a second liquid outlet structure, and the third heat exchanger is provided with a third heat release passage and a third heat absorption passage, Two ends of the third heat release passage are respectively connected with the second liquid inlet structure and the second liquid outlet structure, and the third heat absorption passage is connected with the cold water outlet of the cooling tower.

According to an embodiment of the present invention, the second gas outlet is connected with a second fan, the second fan is connected with a second fan frequency conversion linkage, and the moisture exhaust gas outlet of the moisture exhaust structure is connected with a second pressure sensor, The second fan frequency conversion linkage is connected with the second pressure sensor.

The furnace gas treatment method according to the embodiment of the second aspect of the present invention includes:

Cooling, the furnace gas discharged from the furnace gas outlet of the combustion furnace is cooled to 60-100 °C;

Washing with water, the furnace gas cooled to 60-100°C passes through a water bed with a preset height, the furnace gas cooled to 60-100°C is cooled to 30-50°C, and the water bed absorbs impurities in the furnace gas;

Exhaust, the furnace gas cooled to 30-50°C is discharged through a fan, and the exhaust air volume of the fan is adjusted according to the pressure of the furnace gas outlet, so that the pressure of the furnace gas outlet is kept within the set pressure range.

The above-mentioned one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

The embodiment of the present invention includes a first heat exchanger, and the furnace gas of the combustion furnace is exothermic and cooled in the first heat exchanger; it also includes a first cleaning tower, and the furnace gas that has undergone one exothermic cooling is carried out in the first cleaning tower. During the secondary exothermic cooling process, the furnace gas is cleaned to remove impurities, and then discharged; during the secondary cooling process, the first circulating liquid in the first cleaning tower is recycled, and the first The circulating liquid is cooled in the third heat exchanger and then returned to the first cleaning tower, so as to reduce the consumption of the first circulating liquid, reduce the amount of sewage treatment, and reduce the cost.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of an exhaust gas treatment system in the production of cut tobacco provided by an embodiment of the present invention;

Fig. 2 is the structural representation of the furnace gas treatment part of the combustion furnace in the exhaust gas treatment system in the cut tobacco production provided by the embodiment of the present invention;

Fig. 3 is the structural representation of the cleaning tower in the exhaust gas treatment system in the cut tobacco production provided by the embodiment of the present invention;

Fig. 4 is the schematic diagram of the structure in direction A in Fig. 3 of the cleaning tower in the exhaust gas treatment system in the cut tobacco production provided by the embodiment of the present invention;

5 is a schematic view of the structure in the direction B in FIG. 3 of the cleaning tower in the exhaust gas treatment system in the cut tobacco production provided by the embodiment of the present invention;

6 is a partially enlarged structural schematic diagram of the position C in FIG. 3 of the cleaning tower in the exhaust gas treatment system in the production of cut tobacco provided by the embodiment of the present invention.

Reference number:

1. Combustion furnace; 101, first pressure sensor; 102, first exhaust branch; 103, second exhaust branch; 104, second temperature sensor;

2. The first heat exchanger; 201, the first heat release path; 2011, the third temperature sensor; 2012, the third thermometer; 2013, the fourth temperature sensor; 2014, the fourth thermometer; 202, the first heat absorption path; 2021, the first inlet pipeline; 2022, the first outlet pipeline; 2023, the first regulating valve; 2024, the first flow meter; 2025, the fifth thermometer; 2026, the second regulating valve; 203, the drainage pipeline; 2031, the third regulating valve;

3. The first cleaning tower; 301, the first liquid inlet structure; 302, the first liquid outlet structure; 3021, the liquid outlet pump; 303, the first sewage assembly; 304, the first gas inlet; 305, the first gas outlet; 3051, the first thermometer; 3052, the first temperature sensor; 306, the baffle assembly; 307, the water bed assembly; 3071, the water baffle; 309. Access door;

4. The second heat exchanger; 401, the second heat release path; 402, the second heat absorption path; 4021, the second outlet pipeline; 4022, the second inlet pipeline; 4023, the sixth thermometer;

5. The first fan; 501, the frequency conversion linkage of the first fan;

6, cooling tower; 7, cooling water tank; 8, third heat exchanger; 9, second cleaning tower; 10, second fan; 1001, second fan frequency conversion linkage; 1002, second pressure sensor;

11. The moisture exhaust hood of the drying machine; 12. The negative pressure pipe of the drying machine.

Detailed ways

The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right" , "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing this Inventive embodiments and simplified descriptions are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present invention in specific situations.

In the embodiments of the present invention, unless otherwise expressly specified and limited, the first feature "above" or "under" the second feature may be in direct contact with the first and second features, or the first and second features pass through the middle indirect contact with the media. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structures, materials, or features are included in at least one example or example of embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

1 to 6, an embodiment of the present invention provides an exhaust gas treatment system in the production of shredded tobacco, including: a first heat exchanger 2, a first cleaning tower 3 and a second heat exchanger 4. A heat exchanger 2 is provided with a first heat release passage 201 and a first heat absorption passage 202 for exchanging heat with the first heat release passage 201. Both ends of the first heat release passage 201 are respectively connected to the furnace gas outlet of the combustion furnace 1. Connected with the first gas inlet 304 of the first cleaning tower 3; the first cleaning tower 3 is also provided with a first gas outlet 305 above the first gas inlet 304, and the first gas inlet 304 is communicated with the first gas outlet 305; The first cleaning tower 3 is provided with a first liquid inlet structure 301 and a first liquid outlet structure 302, and the first liquid inlet structure 301 is located above the first liquid outlet structure 302; the second heat exchanger 4 is provided with a second discharge structure. The heat passage 401 and the second heat absorption passage 402 exchange heat with the second heat release passage 401 , and both ends of the second heat release passage 401 communicate with the first liquid inlet structure 301 and the first liquid outlet structure 302 respectively.

After the furnace gas in the combustion furnace 1 is discharged from the furnace gas outlet, it is passed into the first heat release passage 201 of the first heat exchanger 2, and the furnace gas is cooled in the first heat release passage 201 and the first heat absorption passage 202. The source fluid undergoes heat exchange, and the furnace gas is discharged from the first heat release passage 201 after being cooled once by exothermic heat, and enters the first gas inlet 304 of the first cleaning tower 3 . In the first cleaning tower 3 , the furnace gas is in contact with the first circulating liquid for heat exchange and impurities removal, and the furnace gas is discharged from the first gas outlet 305 after secondary exothermic cooling and cooling. And the first circulating liquid removes the impurities in the furnace gas, absorbs the water vapor in the furnace gas, and removes the water-soluble impurities and particulate impurities in the furnace gas at the same time. The impurities include substances with peculiar smell, and the first cleaning tower 3 can achieve removal. Odor effect.

The first circulating liquid circulates between the first cleaning tower 3 and the second heat exchanger 4, the first circulating liquid and the furnace gas exchange heat and absorb heat to increase the temperature, and the heated first circulating liquid flows from the first liquid outlet structure 302. It is discharged and enters the second heat release passage 401 of the second heat exchanger 4, the first circulating liquid releases heat in the second heat exchanger 4 to cool down, and then the first circulating liquid enters the first cleaning tower along the first liquid inlet structure 301 3. Complete one cycle of the first circulating fluid. The first circulating liquid is recycled, which reduces the amount of sewage discharged into the sewage station, saves the water consumption of the exhaust gas treatment system, and reduces the operation cost. The cooling source fluid in the second heat-absorbing passage 402 absorbs heat and heats up, and the cooling source fluid can be cooling water, the cooling water after heat-absorbing can utilize its heat, and the cooling water after heat-absorbing can return to the first heat-absorbing cooling water after exothermic cooling. The second heat exchange passage; or, the cooling water after heat absorption is cooled in the air and then returned to the second heat exchange passage, thereby simplifying the structure.

In this embodiment, the first heat exchanger 2 and the second heat exchanger 4 may have various structural forms, such as a tubular heat exchanger or a plate heat exchanger. When the first heat exchanger 2 is a shell and tube heat exchanger, the first heat release passage 201 is the shell side, that is, the furnace gas goes through the shell side, and the first heat absorption passage 202 is the tube side, that is, the cold source fluid goes through the tube side, It is suitable for heat exchange of furnace gas with a large flow rate, and it helps to reduce the volume of the first heat exchanger 2 and the equipment cost while ensuring the gas circulation of the furnace.

This embodiment effectively reduces odor without affecting the original parameters and normal operation of the expansion combustion furnace 1 in the silk making workshop; it is suitable for furnace gas treatment of the combustion furnace 1 in various tobacco production lines. The exhaust gas treatment system of this embodiment has a simple structure and less equipment, recovers the waste heat of the furnace gas, and removes impurities in the furnace gas. The environmental pollution caused by the emission of furnace gas, and the energy saving effect is remarkable. This embodiment is suitable for the treatment of high-temperature odorous furnace gas discharged from the chimney of the combustion furnace 1, and also suitable for the discharge of exhaust gas with a low exhaust temperature (such as the moisture exhaust gas of an airflow type silk dryer), and has a wide range of applications.

It should be noted that the furnace gas outlet of the combustion furnace 1 is communicated with the first heat release passage 201 of the first heat exchanger 2 through the second exhaust branch 103, and the furnace gas outlet of the combustion furnace 1 is also connected with a first exhaust gas The branch 102 directly communicates with the atmosphere of the first exhaust branch 102 . When equipment failure occurs in the exhaust gas treatment system, furnace gas can be discharged into the atmosphere through the first exhaust branch passage 102 as a backup exhaust passage. The first exhaust branch 102 and the second exhaust branch 103 are connected through a three-way valve, and each branch is provided with a proximity sensor, and the proximity sensor and the three-way valve double control the on-off of each branch. Further, a second temperature sensor 104 is connected to the second exhaust branch 103 to measure the furnace gas outlet temperature.

In another embodiment, the exhaust gas treatment system further includes a first fan 5 disposed at the first gas outlet 305, the first fan 5 is connected with a first fan frequency conversion linkage 501, and the furnace gas outlet is connected with a first pressure sensor 101. The first fan frequency conversion linkage 501 is connected to the first pressure sensor 101. The first fan frequency conversion linkage 501 adjusts the exhaust air volume of the first fan 5 according to the pressure change of the first pressure sensor 101 and maintains the pressure of the furnace gas outlet. Within the set pressure range, the furnace gas outlet pressure of the combustion furnace 1 is precisely controlled to ensure that the operation of the combustion furnace 1 is not affected during the odor treatment process.

The connection between the first fan frequency conversion linkage 501 and the first pressure sensor 101 may be wireless connection, connection through a control system, or direct connection through a transmission line.

In this embodiment, the pressure of the furnace gas outlet is controlled by the exhaust air volume of the first fan 5, so as to ensure that the fuel in the combustion furnace 1 is burnt as stably and fully as possible, and the influence of the environmental pressure change on the combustion furnace 1 is reduced. Compared with the prior art, in which the furnace gas outlet of the combustion furnace 1 directly discharges the furnace gas into the environment, the furnace gas outlet is affected by the change of the environmental pressure, the exhaust gas volume of the combustion furnace 1 fluctuates, and the fuel in the combustion furnace 1 fluctuates. The combustion efficiency will change accordingly; and after using the exhaust gas treatment system of this embodiment, the furnace gas outlet pressure of the combustion furnace 1 is kept within the set pressure range, the furnace gas outlet pressure can be adjusted and controlled, and the furnace gas outlet pressure It is no longer affected by environmental conditions, but can be adjusted by the first fan 5, which can improve the combustion stability of the combustion furnace 1 and ensure the combustion efficiency.

Further, a first thermometer 3051 and a first temperature sensor 3052 are provided at the inlet of the first fan 5 and/or the first gas outlet 305 of the first cleaning tower 3 for displaying and transmitting the furnace discharged from the first gas outlet 305 air temperature. The first thermometer 3051 directly displays the temperature indication, and the first temperature sensor 3052 transmits the measured temperature to the control system for remote monitoring. If the distance between the inlet of the first fan 5 and the first gas outlet 305 is relatively far, then each set of first thermometers 3051 and the first temperature sensor 3052 are provided. Only one set of the first thermometer 3051 and the first temperature sensor 3052 can be set between the inlet of the first fan 5 and the first gas outlet 305 .

Examples of cleaning columns are provided below. It should be noted that both the first cleaning tower 3 and the second cleaning tower 9 below can use the cleaning towers in the following embodiments, and the following content will be described by taking the first cleaning tower 3 as an example.

1 to 6, in another embodiment, the first cleaning tower 3 is provided with a water bed assembly 307, the first liquid inlet structure 301 enters the first circulating liquid into the first cleaning tower 3, A circulating liquid forms a water bed on the water bed assembly 307, and the furnace gas of the combustion furnace 1 passes through the water bed from bottom to top to form bubbles on the water bed.

During the heat exchange between the furnace gas and the water bed, and the furnace gas flows from bottom to top, the first circulating liquid produces resistance to the furnace gas flowing upward. During the process of the furnace gas overcoming the resistance of the first circulating liquid, the furnace gas makes the After forming bubbles on the bed surface and breaking the bubbles, a cleaning is completed to ensure that the furnace gas fully contacts the first circulating liquid, and that the first circulating liquid can fully remove impurities in the furnace gas. At the same time, during the upward flow of the furnace gas, the temperature in the furnace gas decreases, the water vapor in the furnace gas is precipitated, and the substances containing peculiar smell dissolved in the water vapor are precipitated, and the precipitation effect of impurities in the furnace gas is good.

Wherein, the first circulating liquid can be water, which is convenient for recycling and recycling; the first circulating liquid can also be a specific liquid that absorbs impurities in furnace gas, and has high treatment efficiency.

In this embodiment, by forming a water bed in the first cleaning tower 3, the cleaning effect of the furnace gas is ensured. Compared with spray cleaning, the cleaning effect of furnace gas is significantly improved.

Further, a multi-layer water bed assembly 307 is arranged in the first cleaning tower 3, so that the furnace gas can be fully cleaned, the heat exchange and cleaning effects of the furnace gas can be improved, and the impact of the furnace gas on the environment can be fully reduced.

Preferably, two layers of water bed components 307 are arranged in the first cleaning tower 3 to meet the furnace gas treatment requirements of the cut tobacco production line, and help to simplify the structure of the first cleaning tower 3 and reduce the cost of the first cleaning tower 3 .

Further, as shown in FIG. 3 and FIG. 6 , the water bed assembly 307 includes a sieve plate 3072 and a water blocking plate 3071 connected to the sieve plate 3072 . The sieve plate 3072 is connected to the inner wall of the first cleaning tower 3 , on the sieve plate 3072 There are through holes, the height of the water blocking plate 3071 can be adjusted, the straight section of the sieve plate 3072 is connected to the water blocking plate 3071, a falling water channel is formed between the water blocking plate 3071 and the first cleaning tower 3, and the first circulating liquid on the water bed passes through The falling water channel overflows downward, and overflows to the bottom of the next layer of water bed assembly 307 or the first cleaning tower 3 .

The falling water channels formed by adjacent water bed assemblies 307 are staggered, and the liquid inlet positions of the first liquid inlet structure 301 are also staggered with their adjacent falling water channels, ensuring that the first circulating liquid is fully utilized on each water bed.

The first circulating liquid forms a water bed on the sieve plate 3072. The thickness of the water bed on the sieve plate 3072 is adjusted by the height of the water baffle plate 3071. The height of the water baffle plate 3071 can be adjusted, and the height of the water bed can be adjusted as required.

In another embodiment, the water bed assembly 307 further includes a bracket 3074, the bracket 3074 is fixed on the inner wall of the first cleaning tower 3, the sieve plate 3072 is connected to the bracket 3074, and the bracket 3074 includes a plurality of reinforcing frames 3073, the reinforcing frames The 3073 is arranged below the sieve plate 3072 , and the reinforcing frame 3073 plays the role of strengthening and supporting the sieve plate 3072 . The reinforcing frame 3073 can be selected from angle steel, and the frame 3074 connected to the inner wall of the first cleaning tower 3 is an inverted U-shaped frame body with flanging in cross-section, and the flanging is used to support the sieve plate 3072 .

In another embodiment, the bracket 3074 is provided with a long hole in the height direction, the water blocking plate 3071 is connected to the long hole by bolts, and the installation position of the water blocking plate 3071 on the long hole can be adjusted, thereby facilitating the adjustment of the water blocking plate 3071 The height of the water bed can be adjusted.

In another embodiment, the connection between the water blocking plate 3071 and the bracket 3074 can also be clip connection, and the water blocking plate 3071 is clipped at different heights of the bracket 3074, and the height of the water bed can also be adjusted. The connection method of the water baffle 3071 on the bracket 3074 is not limited to the above two, and other connection methods that can realize height adjustment are acceptable, and details are not described here.

In another embodiment, the sieve plate 3072 has an arcuate shape, the arcuate shape includes a circular arc segment and a straight segment, the water blocking plate 3071 is connected to the straight segment, and the circular arc segment adapts to the shape of the inner wall of the first cleaning tower 3 .

In another embodiment, an observation window 308 is provided on the first cleaning tower 3 , and the observation window 308 is located above the water bed assembly 307 to facilitate observation of the water bed formed on the water bed assembly 307 . When two water bed assemblies 307 are provided, two observation windows 308 are also provided to facilitate independent observation.

In another embodiment, the first cleaning tower 3 is provided with a baffle assembly 306, the baffle assembly 306 is located above the water bed assembly 307, and the baffle assembly 306 is close to the first gas outlet 305, and the baffle assembly 306 is used for The liquid in the first cleaning tower 3 is prevented from being drawn out by the first fan 5, so as to ensure that the first fan 5 can stably suck out the furnace gas.

The baffle assembly 306 includes a plurality of bent plates, and air guide holes are formed on the bent plates, the furnace gas flows out through the air guide holes, and the liquid is blocked by the bent plates and remains in the first cleaning tower 3 . Among them, the bending plate can be bent many times to fully block. The number of air guide holes in each bending section of the bending plate can be the same or different, the number of air guide holes is the same, and the processing is simple; the number of air guide holes is different, and can be decreased sequentially from bottom to top.

Further, the first cleaning tower 3 is also provided with an inspection door 309, the inspection door 309 is located below the water bed assembly 307, and the staff can enter the tower through the inspection door 309 to repair the components in the tower.

Furthermore, the first cleaning tower 3 is provided with a first sewage assembly 303, and the first sewage assembly 303 is communicated with the sewage treatment system so as to treat sewage in a centralized manner. When the sewage in the first cleaning tower 3 needs to be discharged, the first sewage assembly 303 is communicated with the sewage treatment system.

A water-returning level controller is set in the first cleaning tower 3, which can automatically discharge sewage and replenish the first circulating liquid according to the set time.

1 and 2, an embodiment of the first heat exchanger 2 is provided below.

In another embodiment, the inlet pipeline and/or the outlet pipeline of the first heat absorption passage 202 is provided with a regulating valve, so that the temperature of the cooling source fluid in the first heat absorption passage 202 can be raised to a preset temperature.

Specifically, the first heat absorption passage 202 includes a first inlet pipeline 2021, a first outlet pipeline 2022, and a tube bundle in the first heat exchanger 2. A first regulating valve 2023 is connected to the first inlet pipeline 2021, and a first regulating valve 2023 is connected to the first inlet pipeline 2021. An outlet pipeline 2022 is connected with a second regulating valve 2026 to adjust the flow rate of the cooling source fluid entering the first heat exchanger 2 and the flow rate outgoing, thereby accurately controlling the outlet temperature of the cooling source fluid to meet the temperature rise of the cooling source fluid Require. Among them, softened water can be selected as the cooling source fluid, and the softened water has less scaling, which helps to ensure the service life of the first heat exchanger 2 .

Further, the first outlet pipeline 2022 is also provided with a first flow meter 2024 and a fifth thermometer 2025 to accurately monitor the flow rate and temperature. The softened water flowing out of the first outlet pipe 2022 enters the hot water recovery pipe.

In general, the softened water in the first heat exchanger 2 can be set to be heated from 20°C to 85°C, which is widely used.

Furthermore, the first heat exchanger 2 is also connected with a drain line 203, and the drain line 203 is connected with a third regulating valve 2031, which is convenient for cleaning on time.

Furthermore, a third temperature sensor 2011 and a third thermometer 2012 are also connected to the first heat release passage 201 to measure the temperature of the furnace gas in the first heat exchanger 2 . A fourth temperature sensor 2013 and a fourth thermometer 2014 are further connected between the first heat release passage 201 and the first gas inlet 304, so as to calculate the heat exchange efficiency.

Examples of the second heat exchanger 4 are provided below.

The second heat-absorbing passage 402 of the second heat exchanger 4 is supplied with cooling water. The second heat-absorbing passage 402 includes a second inlet pipe 4022 and a second outlet pipe 4021. The second outlet pipe 4021 is provided with a sixth Thermometer 4023 to monitor the temperature of the cooling water after heat exchange.

A liquid outlet pump 3021 is connected between the first liquid outlet structure 302 and the second heat release passage 401 to ensure the circulation effect of the first circulating liquid.

In another embodiment, the cooling water of the second heat exchanger 4 is cooled by the cooling tower 6 , that is, the exhaust gas treatment system further includes the cooling tower 6 , and the second heat absorption passage 402 is communicated with the cold water outlet of the cooling tower 6 . The cooling effect of the cooling water in the second heat exchanger 4 is good, and the cooling water is recycled to reduce the demand for cooling water.

The cooling tower 6 adopts the air-cooling mode to cool down and reduce the cost. The cold water outlet of the air cooling tower is connected to the cooling water tank 7, and the cooling water is stored in the cooling water tank 7. Two water supply pipelines are connected between the cooling water tank 7 and the second inlet pipeline 4022, one is the main pipeline and the other is the backup pipeline to ensure the stable operation of the system.

The above-mentioned embodiments of the present invention can perform odor treatment on the high-temperature odorous gas discharged from the chimney gas of the combustion furnace 1 and perform waste heat recovery, thereby improving the energy utilization rate. Utilizing the inventive concept of the above-mentioned embodiments, the present invention is also applicable to the treatment of moisture-exhausting gas with lower exhaust temperature (eg, gas from an air-flow drying machine).

The following embodiments specifically illustrate the moisture exhaust gas treatment.

In another embodiment, the exhaust gas treatment system further includes a second cleaning tower 9 and a third heat exchanger 8, the gas inlet of the second cleaning tower 9 is connected to the moisture exhaust gas outlet of the moisture exhausting structure, and the The gas inlet is communicated with the gas outlet above it; the second cleaning tower 9 is provided with a second liquid inlet structure and a second liquid outlet structure, and the third heat exchanger 8 is provided with a third heat release passage and a third heat absorption passage, Both ends of the third heat release passage are connected with the second liquid inlet structure and the second liquid outlet structure respectively, and the third heat absorption passage is connected with the cold water outlet of the cooling tower 6 .

The moisture exhaust gas is passed into the second cleaning tower 9 , the moisture exhaust gas contacts the second circulating liquid in the second cleaning tower 9 to exchange heat and remove impurities, and the moisture exhaust gas is discharged through the gas outlet of the second cleaning tower 9 . The second circulating liquid circulates between the second cleaning tower 9 and the third heat exchanger 8, and the second circulating liquid is recycled to reduce the amount of liquid and save costs. The second circulating liquid is passed into the third heat release passage, and cooling water is passed into the third heat absorption passage of the third heat exchanger 8 , and the cooling water is provided by the cooling tower 6 .

The moisture exhaust structure includes the moisture exhaust hood 11 of the drying machine, the negative pressure pipe 12 of the drying machine, and other devices that can generate moisture exhaust gas, which are not listed here. It should be noted that the outlet of the moisture exhaust structure includes two branches. The first branch leads to the second cleaning tower 9, and the second branch is directly connected to the atmosphere. When the cycle corresponding to the first branch fails, The moisture exhaust gas can be directly discharged to ensure the normal operation of production. A temperature sensor and a thermometer are connected between the first branch and the second gas inlet of the second cleaning tower 9 for remote monitoring and on-site display of the temperature of the exhaust gas. Similarly, a temperature sensor and a thermometer are connected between the second branch and the gas inlet of the second cleaning tower 9 .

A temperature sensor and a thermometer are provided between the outlet end of the third heat absorption passage of the third heat exchanger 8 and the cooling tower 6 and between the inlet end and the cooling water tank 7 , and between the water inlet end and the cooling water tank 7 There is also a pump.

The structures and connection structures of the third heat exchanger 8 and the second cleaning tower 9 are the same as those of the second heat exchanger 4 and the first cleaning tower 3 . But according to the different gas flow, the size specification can be adjusted as needed.

On the basis of not affecting the original parameters and normal operation of the air-flow drying machine in the spinning workshop, it can effectively reduce the odor.

In another embodiment, the gas outlet of the second cleaning tower 9 is connected to a second fan 10, the second fan 10 is connected to the second fan frequency conversion linkage 1001, and the moisture exhaust gas outlet of the moisture exhaust structure is connected to the second pressure sensor 1002 , the second fan frequency conversion linkage 1001 is connected with the second pressure sensor 1002 , and the moisture exhaust gas of the moisture exhaust structure is discharged from the second fan 10 .

The second pressure sensor 1002 measures the pressure of the moisture exhaust gas outlet, the second fan variable frequency linkage 1001 receives the pressure signal from the second pressure sensor 1002, and the second fan variable frequency linkage 1001 adjusts the second fan according to the pressure change of the moisture exhaust gas outlet. The speed of the fan 10 is adjusted, and the exhaust air volume of the second fan 10 is adjusted to control the exhaust pressure of the moisture exhaust gas outlet to maintain the set pressure range, reduce the influence of environmental pressure changes on the operation state of the moisture exhaust structure, and improve the operation of the equipment. stability.

Further, a temperature sensor and a thermometer are connected between the inlet of the second fan 10 and the gas outlet of the second cleaning tower 9 to remotely monitor and display the temperature of the exhaust gas on-site.

Another embodiment of the present invention provides a furnace gas treatment method, comprising:

Cooling, the furnace gas discharged from the furnace gas outlet of the combustion furnace 1 is cooled to 60-100 °C;

Wash with water, the furnace gas cooled to 60-100°C passes through the water bed with a preset height, the furnace gas cooled to 60-100°C is cooled to 30-50°C, and the water bed absorbs impurities in the furnace gas;

Exhaust, the furnace gas cooled to 30-50 ℃ is discharged through the fan, and the exhaust air volume of the fan is adjusted according to the pressure of the furnace gas outlet, so that the pressure of the furnace gas outlet is kept within the set pressure range.

Preferably, in the cooling process, the furnace gas is cooled to 85°C, and in the water washing process, the furnace gas is cooled to 35°C. The set pressure range of the furnace gas outlet is 10Pa up and down the set pressure value.

The furnace gas treatment method of this embodiment can be implemented by using the exhaust gas treatment system in the production of cut tobacco in the above embodiment.

In a specific embodiment, when the combustion furnace 1 is installed in the dry ice expanded tobacco production line, the temperature of the furnace gas discharged from the combustion furnace 1 is about 340°C, and the exhaust gas volume is about 10,000 m ³ /h. After the heat exchange and cooling of the heater 2, the temperature of the furnace gas is reduced to 60°C-100°C, preferably the temperature of the furnace gas is reduced to 85°C; the cooled furnace gas is passed into the first cleaning tower 3 for washing, and the process of washing The dual effect of cooling down and removing impurities can be achieved. In the first cleaning tower 3, the furnace gas cooled to 60°C-100°C is contacted with the first circulating liquid to cool down, and the temperature is lowered to 30°C-50°C, preferably, the temperature is lowered to 30°C-50°C. 35°C.

In the process of reducing the furnace gas temperature from about 340°C to 60°C-100°C, the first heat exchanger 2 absorbs heat. When the cooling source fluid in the first heat exchanger 2 is water, it is preferably softened water. The temperature of the softened water is controlled to increase from 20°C to 85°C, so that the flow rate of the softened water in the first heat exchanger 2 can reach 12.5 tons per day, which is equivalent to recovering about 100m3 ^of natural gas calorific value per day, and the heat recovery effect is remarkable.

Further, according to the ideal gas state equation PV=nRT, it can be known that when the ambient pressure is constant, the temperature of the furnace gas decreases, and the volume of the furnace gas decreases. According to the open temperature calculation, the furnace gas temperature is reduced from 340°C to 35°C, which is equivalent to doubling, and the volume of the furnace gas is reduced by half compared with the way of discharging directly from the furnace gas outlet by the first fan 5. That is, the exhaust volume is reduced from 10,000 m ³ /h to about 5,000 m ³ /h, reducing the impact on the surrounding environment.

In the above-mentioned present embodiment, through the method of cooling and washing the discharged gas, the discharge of peculiar smell and harmful gas is reduced and the waste heat is recovered, the use effect is good, and the transformation cost is not high.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should cover within the scope of the claims of the present invention.

Claims (10)

1. an exhaust gas treatment system in the production of shredded tobacco, is characterized in that, comprises: the first heat exchanger, the first cleaning tower and the second heat exchanger, The first heat exchanger is provided with a first heat release passage and a first heat absorption passage that exchanges heat with the first heat release passage, and both ends of the first heat release passage are respectively connected to the furnace gas of the combustion furnace. The outlet is communicated with the first gas inlet of the first cleaning tower, the first cleaning tower is also provided with a first gas outlet above the first gas inlet, and the first gas inlet is connected to the first gas inlet. The gas outlet is connected; The first cleaning tower is provided with a first liquid inlet structure and a first liquid outlet structure, and the first liquid inlet structure is located above the first liquid outlet structure; The second heat exchanger is provided with a second heat release passage and a second heat absorption passage for exchanging heat with the second heat release passage, and both ends of the second heat release passage are respectively connected to the first inlet and outlet. The liquid structure communicates with the first liquid outlet structure. 2 . The exhaust gas treatment system in tobacco production according to claim 1 , further comprising a first fan arranged at the first gas outlet, and a first fan frequency conversion linkage is connected to the first fan. 3 . , the furnace gas outlet is connected with a first pressure sensor, and the first fan, the first fan frequency conversion linkage and the first pressure sensor are connected. 3. The exhaust gas treatment system in the production of cut tobacco according to claim 1, wherein the first cleaning tower is provided with a water bed assembly, and the first liquid inlet structure communicates with the first cleaning tower. into the first circulating liquid, the first circulating liquid forms a water bed with a preset height on the water bed assembly, and the furnace gas of the combustion furnace passes through the water bed from bottom to top to form bubbles on the water bed . 4 . The exhaust gas treatment system in cut tobacco production according to claim 3 , wherein the water bed assembly comprises a sieve plate and a water blocking plate connected to the sieve plate, and the sieve plate is connected to the first sieve plate. 5 . The inner wall of a cleaning tower, the sieve plate is provided with through holes, the height of the water blocking plate is adjustable, and a falling water channel is formed between the water blocking plate and the inner wall of the first cleaning tower. 5 . The exhaust gas treatment system in the production of cut tobacco according to claim 4 , wherein at least two layers of the water bed components are arranged in the first cleaning tower. 6 . 6 . The exhaust gas treatment system in the production of cut tobacco according to claim 1 , wherein the inlet pipeline and/or the outlet pipeline of the first heat absorption passage is provided with a regulating valve. 7 . 7 . The exhaust gas treatment system in tobacco production according to claim 1 , further comprising a cooling tower, and the second heat absorption passage is communicated with a cold water outlet of the cooling tower. 8 . 8. The exhaust gas treatment system in shredded tobacco production according to claim 7, characterized in that, further comprising a second cleaning tower and a third heat exchanger, and the second gas inlet of the second cleaning tower is connected to the The moisture exhaust gas outlet is connected with the second gas outlet above the second gas inlet; the second cleaning tower is provided with a second liquid inlet structure and a second liquid outlet structure, and the third heat exchanger is provided with a second liquid inlet structure and a second liquid outlet structure. There are a third heat release passage and a third heat absorption passage, two ends of the third heat release passage are respectively connected with the second liquid inlet structure and the second liquid outlet structure, and the third heat absorption passage is connected with the second liquid inlet structure and the second liquid outlet structure respectively. The cold water outlet of the cooling tower is communicated. 9. The exhaust gas treatment system in the production of cut tobacco according to claim 8, wherein the second gas outlet is connected with a second fan, and the second fan is connected with a second fan frequency conversion linkage, and the exhaust fan is The moisture exhaust gas outlet of the tidal structure is connected with a second pressure sensor, and the second fan frequency conversion linkage is connected with the second pressure sensor. 10. A furnace gas treatment method, comprising: Cooling, the furnace gas discharged from the furnace gas outlet of the combustion furnace is cooled to 60-100 °C; Wash with water, the furnace gas cooled to 60-100°C passes through a water bed with a preset height, the furnace gas cooled to 60-100°C is cooled to 30-50°C, and the water bed absorbs impurities in the furnace gas ; Exhaust, the furnace gas cooled to 30-50°C is discharged through a fan, and the exhaust air volume of the fan is adjusted according to the pressure of the furnace gas outlet, so that the pressure of the furnace gas outlet is kept within the set pressure range.

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