Waste heat recovery and rime fog elimination system for peculiar smell treatment of moisture removal washing pool of cigarette factory

Abstract

The utility model discloses a waste heat recovery and rime fog elimination system for peculiar smell treatment of a moisture removal washing pool of a cigarette factory, which comprises a pretreatment unit, a circulating washing pool, an exhaust fan and an exhaust funnel which are sequentially connected through a moisture removal pipeline, an air-water heat exchange condenser is arranged between the exhaust fan and the exhaust funnel; the air-water heat exchange condenser and the water-water heat exchanger are sequentially arranged on an evaporation side circulation pipeline of the heat pump unit in the water flow direction, and a branch circulation pipeline used for being connected with the air conditioning unit is arranged on a condensation side circulation pipeline of the heat pump unit. And a cold water return direct connection pipeline and a hot water supply direct connection pipeline are arranged between the condensation side circulation pipeline and the evaporation side circulation pipeline. The device is low in investment, quick in effect, energy-saving and environment-friendly, and solves the problem that moisture exhaust gas of a cigarette factory is easy to fog at high temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a waste heat recovery and white mist elimination system for odor treatment in a dehumidification washing pool of a cigarette factory. Background Art

[0002] Tobacco processing produces exhaust gas with a strong odor, which is usually treated by low-temperature plasma + multi-stage water washing. The principle is to use countercurrent circulation spraying, cross-current circulation spraying or filler spray absorption to absorb dust or odor in the exhaust gas through sufficient gas-liquid contact.

[0003] The temperature of the waste gas after the washing tank treatment is high. Part of the heat energy enters the sewage pipe with the sewage from the washing tank, and the other part of the heat energy is discharged into the atmosphere through the exhaust pipe with the waste gas, and a large amount of white fog is generated. The white fog phenomenon affects the traffic and visibility in the surrounding area and does not meet the environmental protection requirements. Summary of the invention

[0004] In order to solve the above problems, the utility model provides a waste heat recovery and white mist elimination system for odor treatment in a dehumidification washing pool of a cigarette factory, and the following technical solutions can be specifically adopted:

[0005] The waste heat recovery and white mist elimination system for odor treatment in a dehumidification washing pool of a cigarette factory described in the utility model comprises a pretreatment unit, a circulating washing pool, an exhaust fan and an exhaust chimney which are connected in sequence through dehumidification pipes, the circulating washing pool is connected with a water-water heat exchanger, an air-water heat exchange condenser is arranged between the exhaust fan and the exhaust chimney; the air-water heat exchange condenser and the water-water heat exchanger are arranged in sequence on the evaporation side circulation pipeline of the heat pump unit along the direction of water flow, a branch circulation pipeline for connecting to the air-conditioning unit is arranged on the condensation side circulation pipeline of the heat pump unit, and the inlet end of the condensation side circulation pipeline is connected to the outlet end of the evaporation side circulation pipeline through a cold water return direct connection pipeline, the inlet end of the evaporation side circulation pipeline is connected to the outlet end of the condensation side circulation pipeline through a hot water supply direct connection pipeline, and a first switching valve is arranged between the cold water return direct connection pipeline, the hot water supply direct connection pipeline, the evaporation side circulation pipeline and the condensation side circulation pipeline.

[0006] The circulating washing tank includes a primary circulating washing tank, a secondary circulating washing tank and a tertiary circulating washing tank connected in series, the water-water heat exchanger is connected to the water washing circulation pipeline of the primary circulating washing tank, and a cooling circulation branch pipe for connecting to a cooling tower is arranged on the water washing circulation pipeline, and a second switching valve is arranged between the cooling circulation branch pipe and the water washing circulation pipeline.

[0007] The dehumidification duct is provided with a first branch pipe and a second branch pipe between the exhaust fan and the exhaust pipe, the air-water heat exchange condenser is arranged on the second branch pipe, and a third switching valve is arranged between the first branch pipe and the second branch pipe.

[0008] The evaporation side circulation pipeline is provided with an energy storage water tank, and the evaporation side circulation pipeline and the condensation side circulation pipeline are both provided with a circulation pump and a constant pressure pipeline connected to the expansion constant pressure water tank.

[0009] There is at least one air-conditioning unit, and the branch circulation pipeline on each air-conditioning unit includes a first hot water circulation branch pipe connected to the fresh air hot water preheating section and a second hot water circulation branch pipe connected to the hot water heating section. The first hot water circulation branch pipe and the second hot water circulation branch pipe are both provided with on-off valves.

[0010] The utility model recovers the waste heat of the damp exhaust gas in the cigarette factory in winter, realizes the re-emission after air conditioning heating and exhaust gas cooling and condensation, and effectively reduces the appearance of white fog. It has low investment, fast effect, energy saving and environmental protection, and solves the problem of damp exhaust gas in cigarette factories. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 .

[0012] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 . DETAILED DESCRIPTION

[0013] The following is a detailed description of an embodiment of the utility model in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific operation process are given, but the protection scope of the utility model is not limited to the following embodiment.

[0014] like Figure 1 , 2 As shown, the waste heat recovery and white mist elimination system for odor treatment in a dehumidification washing tank in a cigarette factory described in the utility model includes a pretreatment unit, a circulating washing tank, an exhaust fan and an exhaust pipe connected in sequence through a dehumidification pipe, and a water-to-water heat exchanger, an air-to-water heat exchange condenser, a heat pump unit, etc. arranged for waste heat recovery.

[0015] Specifically, the circulating washing tank includes a primary circulating washing tank 11, a secondary circulating washing tank 12 and a tertiary circulating washing tank 13 connected in series, each circulating washing tank performs a water washing cycle and is provided with a water supply valve and a sewage valve. The waste gas entering the primary circulating washing tank 11 has a high heat content, so a water-water heat exchanger 15 is provided on the water washing circulation pipeline 14 of the primary circulating washing tank 11 to recover the waste heat of the waste gas. At the same time, a cooling circulation branch pipe 16 is also provided on the water washing circulation pipeline 14, and an open cooling tower 17 is connected to the cooling circulation branch pipe 16. In order to realize the switching of the use status of the water-water heat exchanger 15 and the open cooling tower 17, a second switching valve 18 is provided at the corresponding positions of the cooling circulation branch pipe 16 and the water washing circulation pipeline 14.

[0016] Secondly, the dehumidification duct is divided into a first branch pipe 31 and a second branch pipe 32 between the exhaust fan 2 and the exhaust pipe, and the second branch pipe 32 is connected to an air-water heat exchange condenser 33, that is, the first branch pipe 31 is used for direct exhaust of exhaust gas, and the exhaust gas in the second branch pipe 32 is discharged after heat recovery, cooling and dehumidification. In order to achieve the switching between the two discharge modes, at least one air valve (usually an electric air valve) is installed on the first branch pipe 31 and the second branch pipe 32 as the third switching valve member 34.

[0017] The water-water heat exchanger 15 and the air-water heat exchange condenser 33 are connected to the air conditioning unit 4 through pipelines or connected to the air conditioning unit 4 through the heat pump unit 5, so as to realize the reuse of waste heat.

[0018] Specifically, the air-water heat exchange condenser 33 and the water-water heat exchanger 15 are sequentially arranged on the evaporation side circulation pipeline 51 of the heat pump unit 5 along the direction of the water flow, and the condensation side circulation pipeline 52 of the heat pump unit 5 is provided with a branch circulation pipeline for connecting the air conditioning unit 4, and the inlet end of the condensation side circulation pipeline 52 is connected to the outlet end of the evaporation side circulation pipeline 51 through the cold water return direct connection pipeline 61, and the inlet end of the evaporation side circulation pipeline 51 is connected to the outlet end of the condensation side circulation pipeline 52 through the hot water supply direct connection pipeline 62. A first switching valve 7 is arranged between the cold water return direct connection pipeline 61, the hot water supply direct connection pipeline 62, the evaporation side circulation pipeline 51 and the condensation side circulation pipeline 52. (Note: The above "inlet end" and "outlet end" are defined based on the direction of the evaporation side circulation pipeline 51 / condensation side circulation pipeline 52 entering and exiting the heat pump unit 5)

[0019] The evaporation side circulation pipeline 51 is provided with an energy storage water tank 53, and the evaporation side circulation pipeline 51 and the condensation side circulation pipeline 52 are both provided with a circulation pump 54 and a constant pressure pipeline connected to the expansion constant pressure water tank 55. Usually, there is at least one set of air conditioning units 4, and the branch circulation pipelines on each set of air conditioning units 4 include a first hot water circulation branch pipe 56 connected to the fresh air hot water preheating section 41 and a second hot water circulation branch pipe 57 connected to the hot water heating section 42, and the first hot water circulation branch pipe 56 and the second hot water circulation branch pipe 57 are both provided with an on-off valve 58.

[0020] The working principle of the utility model is as follows:

[0021] (1) Water washing and purification unit

[0022] The exhaust gas from the workshop enters the odor removal system through the exhaust pipe, is first treated by the pretreatment unit using methods such as low-temperature plasma, and then enters the primary circulation washing tank 11, the secondary circulation washing tank 12, and the tertiary circulation washing tank 13 for water washing and purification, and then pressurized by the exhaust fan 2.

[0023] 1) When waste heat recovery is performed: the opening and closing state of the third switching valve 34 is adjusted to allow the exhaust gas with dehumidification to enter the air-water heat exchange condenser 33. After the flue gas with high temperature and humidity meets the low-temperature air-conditioning water and condenses, the flue gas temperature and moisture content are reduced and then discharged to the atmosphere through the exhaust pipe. The condensed water is connected to the drainage pipe through the condensed water pipe.

[0024] 2) When waste heat recovery is not required: adjust the opening and closing state of the third switching valve member 34 so that the exhaust gas directly enters the exhaust pipe and is discharged into the air.

[0025] In the above process, the primary circulation washing tank 11, the secondary circulation washing tank 12, and the tertiary circulation washing tank 13 are all replenished with fresh water through the tap water pipe, and sewage is discharged regularly, and the sewage is collected through the drainage pipe.

[0026] The operation of the primary circulation washing tank 11 is divided into the following two situations:

[0027] 1) When it is necessary to recover the waste heat of the primary circulation washing tank 11, by adjusting the opening and closing state of the second switching valve 18, the water in the primary circulation washing tank 11 is pressurized by the circulation pump, and enters the water-water heat exchanger 15 through the water washing circulation pipeline 14 for heat exchange. The cooled water returns to the primary circulation washing tank 11 for spraying, and the exhaust gas is washed and purified by water.

[0028] 2) When there is no need to recover the waste heat of the primary circulation washing tank 11 and the temperature of the primary circulation washing tank 11 is relatively high, by adjusting the opening and closing state of the second switching valve 18, the water in the primary circulation washing tank 11 is pressurized by the circulation pump and then enters the open cooling tower 17 through the cooling circulation branch pipe 16 for cooling. The cooled water returns to the primary circulation washing tank 11 for spraying, and the exhaust gas is washed and purified.

[0029] The water in the secondary circulation washing tank 12 and the tertiary circulation washing tank 13 is reciprocated by the corresponding circulation pumps, and the waste gas is subjected to secondary and tertiary spray purification.

[0030] (2) Waste heat recovery unit

[0031] 1) When the temperature of the hot water recovered from the waste heat of the exhaust gas can meet the heating demand of the air-conditioning unit 4 (the temperature is greater than or equal to 40°C), the heat pump unit 5 is not activated.

[0032] At this time, the first switching valve 7 on the evaporation side circulation pipeline 51 and the condensation side circulation pipeline 52 is closed, and the first switching valve 7 on the cold water return direct connection pipeline 61 and the hot water supply direct connection pipeline 62 is opened.

[0033] In winter, low-temperature water from the fresh air hot water preheating section 41 in the air-conditioning unit 4 is collected in the condensation side circulation pipeline 52 through the first hot water circulation branch pipe 56, and low-temperature water from the hot water heating section 42 in the air-conditioning unit 4 is also collected in the condensation side circulation pipeline 52 through the second hot water circulation branch pipe 57, and then enters the evaporation side circulation pipeline 51 through the cold water return direct connection pipeline 61, and then enters the air-water heat exchange condenser 33, the low-temperature water is preliminarily heated by the purified exhaust gas, and then enters the water-water heat exchanger 15, and is heated again by the water in the primary circulation washing tank 11, and then enters the energy storage water tank 53, and after being pressurized by the circulating water pump 54, it enters the first hot water circulation branch pipe 56 and the second hot water circulation branch pipe 57 respectively through the hot water supply direct connection pipeline 62, so as to preheat the fresh air of the fresh air preheating section 41 and the hot water heating section 42 of the air-conditioning unit 4 and perform secondary heating of the air after the fresh air and the return air are mixed. The low-temperature water after being cooled is then collected into the condensation side circulation pipeline 52 through the first hot water circulation branch pipe 56 and the second hot water circulation branch pipe 57 respectively, and the circulation is repeated in this way.

[0034] The constant pressure of the above-mentioned waste heat recovery pipeline is expanded and constant pressure is achieved by the expansion constant pressure water tank 55 on the evaporation side circulation pipeline 51.

[0035] 2) When the temperature of hot water recovered from exhaust gas waste heat cannot meet the heating demand of air conditioning unit 4 (temperature is lower than 40°C), the heat pump unit 5 is activated to improve the temperature and quality of the recovered heat energy. The specific implementation method is as follows:

[0036] At this time, the first switching valve 7 on the cold water return direct connection pipeline 61 and the hot water supply direct connection pipeline 62 is closed, and the first switching valve 7 on the evaporation side circulation pipeline 51 and the condensation side circulation pipeline 52 is opened.

[0037] 21) For the condensing side of heat pump unit 5:

[0038] In winter, the low-temperature water from the fresh air hot water preheating section 41 of the air conditioning unit 4 is collected to the condensation side circulation pipeline 52 through the first hot water circulation branch pipe 56, and the low-temperature water from the hot water heating section 42 of the air conditioning unit 4 is collected to the condensation side circulation pipeline 52 through the second hot water circulation branch pipe 57. The low-temperature water first enters the condenser of the heat pump unit 5 through the condensation side circulation pipeline 52. After the water is heated in the condenser, it enters the first hot water circulation branch pipe 56 and the second hot water circulation branch pipe 57 again, respectively preheating the fresh air of the fresh air hot water preheating section 41 of the air conditioning unit 4, and secondary heating the air after the fresh and return air are mixed in the hot water heating section 42. The low-temperature water after cooling is collected to the condensation side circulation pipeline 52 through the first hot water circulation branch pipe 56 and the second hot water circulation branch pipe 57, and the cycle is repeated.

[0039] The constant pressure of the above-mentioned condensation side circulation pipeline 52 is expanded and constant pressure is achieved by the expansion constant pressure water tank 55 on the condensation side circulation pipeline 52.

[0040] 22) For the evaporation side of heat pump unit 5:

[0041] In winter, low-temperature water from the evaporator of the heat pump unit 5 first enters the air-water heat exchange condenser 33 through the evaporation side circulation pipeline 51, is preliminarily heated by the purified high-temperature exhaust gas, and then enters the water-water heat exchanger 15. After being heated again by the water in the primary circulation washing tank 11, it enters the energy storage tank 53, is pressurized by the circulation water pump 54, enters the evaporation side of the heat pump unit 5, is cooled by the heat pump unit 5, is output through the evaporation side circulation pipeline 51, and enters the air-water heat exchange condenser 33 again, and the cycle repeats.

[0042] The constant pressure of the evaporation side circulation pipeline 51 is achieved by expansion and constant pressure water tank 55 on the evaporation side circulation pipeline 51 .

[0043] (3) Air conditioning unit

[0044] In winter, outdoor fresh air enters the air-conditioning unit 4, is heated by hot water in the fresh air hot water preheating section 41, is mixed with the workshop return air transported to the air-conditioning unit 4 by the return air duct, and then is heated and humidified by the hot water heating section 42 to reach the set temperature and humidity requirements, is pressurized by the air-conditioning fan, and is sent to the workshop.

[0045] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships, such as "front", "rear", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Claims

1. A waste heat recovery and white mist elimination system for odor treatment in a dehumidification washing pool in a cigarette factory, characterized in that: It includes a pretreatment unit, a circulating washing tank, an exhaust fan and an exhaust chimney which are connected in sequence through a dehumidification pipe, the circulating washing tank is connected to a water-water heat exchanger, and an air-water heat exchange condenser is arranged between the exhaust fan and the exhaust chimney; the air-water heat exchange condenser and the water-water heat exchanger are arranged in sequence on the evaporation side circulation pipeline of the heat pump unit along the water flow direction, and a branch circulation pipeline for connecting the air-conditioning unit is arranged on the condensation side circulation pipeline of the heat pump unit, and the inlet end of the condensation side circulation pipeline is connected to the outlet end of the evaporation side circulation pipeline through a cold water return direct connection pipeline, the inlet end of the evaporation side circulation pipeline is connected to the outlet end of the condensation side circulation pipeline through a hot water supply direct connection pipeline, and a first switching valve is arranged between the cold water return direct connection pipeline, the hot water supply direct connection pipeline, the evaporation side circulation pipeline and the condensation side circulation pipeline.

2. The waste heat recovery and white mist elimination system for odor treatment in a dehumidification washing pool in a cigarette factory according to claim 1 is characterized in that: The circulating washing tank includes a primary circulating washing tank, a secondary circulating washing tank and a tertiary circulating washing tank connected in series, the water-water heat exchanger is connected to the water washing circulation pipeline of the primary circulating washing tank, and a cooling circulation branch pipe for connecting to a cooling tower is arranged on the water washing circulation pipeline, and a second switching valve is arranged between the cooling circulation branch pipe and the water washing circulation pipeline.

3. The waste heat recovery and white mist elimination system for odor treatment in a dehumidification washing pool of a cigarette factory according to claim 1 is characterized in that: The dehumidification duct is provided with a first branch pipe and a second branch pipe between the exhaust fan and the exhaust pipe, the air-water heat exchange condenser is arranged on the second branch pipe, and a third switching valve is arranged between the first branch pipe and the second branch pipe.

4. The waste heat recovery and white mist elimination system for odor treatment in a dehumidification washing pool of a cigarette factory according to claim 1 is characterized in that: The evaporation side circulation pipeline is provided with an energy storage water tank, and the evaporation side circulation pipeline and the condensation side circulation pipeline are both provided with a circulation pump and a constant pressure pipeline connected to the expansion constant pressure water tank.

5. The waste heat recovery and white mist elimination system for odor treatment in a dehumidification washing pool of a cigarette factory according to claim 1 is characterized in that: There is at least one air-conditioning unit, and the branch circulation pipeline on each air-conditioning unit includes a first hot water circulation branch pipe connected to the fresh air hot water preheating section and a second hot water circulation branch pipe connected to the hot water heating section. The first hot water circulation branch pipe and the second hot water circulation branch pipe are both provided with on-off valves.

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