Waste heat recovery, condensation and cooling system for tail gas of washing powder spray drying tower

Abstract

The utility model discloses a washing powder spray drying tower tail gas waste heat recovery condensation cooling system, which belongs to the technical field of washing powder tail gas treatment, and comprises a spray drying tower and a hot blast stove, the hot blast stove is provided with a blast stove outlet and a blast stove inlet, and the hot blast stove is communicated to the spray drying tower through the blast stove outlet; the powder spraying drying tower is provided with a tail gas outlet, the tail gas outlet is sequentially communicated with the cyclone separator, the gas-gas heat exchanger, the steam-water heat exchanger and the plasma air purification device, a cold air inlet and a cold air outlet are formed in the gas-gas heat exchanger in the transverse direction, and a fan is arranged at the cold air outlet. The fan is communicated with a blast furnace inlet of the hot blast furnace through a third pipeline; by arranging the gas-gas heat exchanger, waste heat in tail gas of the powder spraying drying tower is effectively recycled and used for preheating cold air entering the hot blast stove, energy consumption is reduced, greenhouse gas emission is reduced, and the green development concept is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to laundry detergent tail gas treatment technical field, concretely relates to a kind of laundry detergent powder spraying drying tower tail gas's waste heat recovery condensing cooling system. BACKGROUND

[0002] Powder spraying drying tower, the key device in laundry detergent powder spraying drying process. The core of powder spraying drying tower is to produce hot air with hot blast furnace, for drying and drying laundry detergent. With the development of production technology, China's laundry detergent drying tower has experienced from burning diesel to burning heavy oil to burning coal. However, the energy consumption of laundry detergent powder spraying drying is high, and high energy consumption leads to a large amount of greenhouse gas emission, causing global warming. In recent years, countries around the world have also emphasized the important role of technology in supporting carbon peak and carbon neutralization, and have implemented a series of measures to support carbon peak and carbon neutralization. Therefore, how to improve the energy-saving and emission-reducing production process of laundry detergent is an urgent need to respond to global climate change.

[0003] In the prior art, Chinese patent document No. CN101760359A provides a laundry detergent production system, which includes a spray drying tower, and further includes at least two sets of laundry detergent slurry feeding devices and the same number of atomizing devices as the laundry detergent slurry feeding devices, the atomizing devices are arranged in the spray drying tower; one set of laundry detergent slurry feeding device is connected with one set of atomizing device; each set of laundry detergent slurry feeding device includes a slurry batching device and a high-pressure pump connected by pipeline, and the high-pressure pump is connected with the atomizing device. The laundry detergent production system mainly transports two or more laundry detergent slurries into the spray drying tower for spray drying into dry powder, to improve production efficiency and reduce energy consumption. However, the waste heat in the tail gas of the laundry detergent production system is not effectively recycled, which not only causes waste, but also may cause environmental pollution. If the heat in the tail gas can be recycled, the energy consumption of laundry detergent production can be reduced, and the purpose of energy saving and emission reduction and reducing greenhouse gas emission can be achieved. In addition, the tail gas from the powder spraying drying tower contains a large amount of water and laundry detergent particles, and the white mist and odor are heavy, which may cause complaints from surrounding residents.

[0004] Therefore, it is necessary to optimize and manage the laundry detergent powder spraying drying tower tail gas in depth, eliminate odor and white mist, reduce tail gas particulate matter emission, and realize recycling of tail gas waste heat, to solve the above problems in the prior art. SUMMARY

[0005] To solve the technical problems that the waste heat in the tail gas of the existing powder spraying drying tower is difficult to be effectively recycled and the tail gas treatment is insufficient, the utility model provides a waste heat recovery condensing cooling system for laundry detergent powder spraying drying tower tail gas.

[0006] The utility model discloses a technical scheme is like this realizes: a laundry powder powder spraying drying tower tail gas's waste heat recovery condensing cooling system, including powder spraying drying tower and hot blast furnace, the hot blast furnace is equipped with the blast furnace export and blast furnace import, and the hot blast furnace is communicated to powder spraying drying tower through blast furnace export, and the powder spraying drying tower is provided with drying hot air; Powder spraying drying tower is equipped with tail gas export, and the tail gas export is connected with the input of cyclone separator through first pipeline, and the output of cyclone separator is connected with gas gas heat exchanger through second pipeline,

[0007] The gas gas heat exchanger is internally provided with a plurality of heat exchange plates which are parallel to each other, the gas gas heat exchanger is provided with a cold air inlet and a cold air outlet in the transverse direction, a fan is arranged at the cold air outlet, and the fan is connected with the blast furnace import of the hot blast furnace through a third pipeline; Fresh air is introduced from the cold air inlet, and after heat exchange, the fresh air is introduced into the hot blast furnace from the cold air outlet to provide preheated fresh air for the hot blast furnace; The hot blast furnace converts the preheated fresh air into the drying hot air; The gas gas heat exchanger is provided with a hot air inlet and a hot air outlet in the longitudinal direction, the hot air inlet is connected with the second pipeline, and the hot air outlet is connected with a steam-water heat exchanger through a fourth pipeline; The gas gas heat exchanger is provided with a first flushing device, and the first flushing device is arranged above the heat exchange plates, and the plane of the first flushing device is perpendicular to the heat exchange plates.

[0008] The steam-water heat exchanger is internally provided with a plurality of heat exchange cores which are parallel to each other, the steam-water heat exchanger is provided with an air inlet and an air outlet in the transverse direction, the air inlet is connected with the side wall of the fourth pipeline, the air outlet is connected with the input of a plasma air purification device, and the output of the plasma air purification device is connected with external air; The steam-water heat exchanger is also provided with a second flushing device, and the second flushing device is arranged between adjacent heat exchange cores, and the plane of the second flushing device is parallel to the plane of the heat exchange cores.

[0009] The utility model discloses a gas gas heat exchanger, which effectively recovers the waste heat in the tail gas of the powder spraying drying tower and is used for preheating the cold air entering the hot blast furnace, reduces energy consumption, significantly improves energy utilization efficiency, helps to reduce greenhouse gas emissions, and meets the green and sustainable development concept. In addition, by arranging the flushing device, the heat exchanger is regularly sprayed and cleaned, the nodule problem caused by the attachment of laundry powder particles on the heat exchange plates or heat exchange cores is effectively avoided, the stability of heat exchange efficiency and the smooth operation of the system are ensured, the production interruption caused by equipment failure is reduced, and the overall production efficiency is improved.

[0010] As a further improvement of the above scheme, the cyclone separator comprises a first cyclone separator and a second cyclone separator, the input ports of the two cyclone separators are oppositely arranged and are connected to each other through a first merging pipe; a first opening is arranged in the middle of the first merging pipe, and the first opening is connected to the first pipe; the oppositely arranged and connected design of the first cyclone separator and the second cyclone separator forms a more efficient tail gas treatment path. When the tail gas passes through the two cyclone separators, it can undergo two efficient particle separation processes, effectively removing fine dust and incompletely dried laundry detergent particles in the tail gas, significantly improving the tail gas purification effect and reducing environmental pollution.

[0011] As a further improvement of the above scheme, the gas-gas heat exchanger comprises a first gas-gas heat exchanger and a second gas-gas heat exchanger, the cold air outlets of the two gas-gas heat exchangers are oppositely arranged and are connected to each other through a second merging pipe; a second opening is arranged in the middle of the second merging pipe, the input port of the fan is connected to the second opening, and the output port of the fan is connected to the third pipe;

[0012] The steam-water heat exchanger comprises a first steam-water heat exchanger and a second steam-water heat exchanger, and the gas inlets of the steam-water heat exchangers are connected to the corresponding hot air outlets of the first gas-gas heat exchanger and the second gas-gas heat exchanger; the gas outlets of the steam-water heat exchangers are connected to the plasma air purification device after being merged.

[0013] The oppositely arranged cold air outlets of the first gas-gas heat exchanger and the second gas-gas heat exchanger are connected to each other through the second merging pipe, which not only ensures the effective capture of heat in the tail gas, but also effectively recovers the residual heat in the tail gas of the spray drying tower through the connection between the second opening and the input port of the fan, and preheats the cold air entering the hot air furnace, reducing energy consumption and significantly improving energy utilization efficiency, which helps to reduce greenhouse gas emissions and conforms to the concept of green and sustainable development. In addition, the parallel use of double gas-gas heat exchangers and double steam-water heat exchangers enhances the redundancy and fault tolerance of the system. Even if one of the heat exchangers fails, the other can still work, ensuring the continuity and stability of tail gas treatment and reducing the risk of system downtime maintenance.

[0014] As a further improvement of the above scheme, the second pipe comprises a tail gas main pipe, one end of the tail gas main pipe is connected to the output port of each cyclone separator; an exhaust port is further arranged on the side of the tail gas main pipe, and the exhaust port is located on the side close to the output port of the cyclone separator; the other end of the tail gas main pipe is provided with two tail gas branch pipes, air valves are arranged in the two tail gas branch pipes, and the air valves are connected to the hot air inlets of the first gas-gas heat exchanger and the second gas-gas heat exchanger.

[0015] As a further improvement of the above scheme, the cyclone separator comprises a support and a separator body arranged on the support; the separator body has a hollow cyclone separation cavity, and the cyclone separation cavity is provided with an input port and an output port at its upper portion; the cyclone separation cavity comprises an upper cavity portion and a lower cavity portion connected and arranged in sequence, the upper cavity portion is cylindrical, and the lower cavity portion is in a tapered structure with a wide upper portion and a narrow lower portion; the bottom of the lower cavity portion is further provided with an ash collection box for collecting dust. By adopting the tapered structure with a wide upper portion and a narrow lower portion for the lower cavity portion, the rotating effect of the tail gas in the cyclone separation cavity is greatly enhanced, so that the dust particles in the tail gas are effectively separated and deposited at the bottom of the tapered lower cavity portion, thereby significantly improving the dust separation efficiency.

[0016] As a further improvement of the above scheme, the heat exchange core is in communication with a cooling water supply device; the heat exchange core is a finned tube arranged in a plate shape in the steam-water heat exchanger, the lower end of the heat exchange core is provided with a cooling water inlet, and the upper end of the heat exchange core is provided with a cooling water outlet; the cooling water inlet and the cooling water outlet are respectively in communication with the cooling water supply device through water pipes.

[0017] As a further improvement of the above scheme, the cooling water supply device comprises at least three cooling water pumps, the pump inlet of each cooling water pump is in communication with a cooling tower, the pump outlets of the cooling water pumps are converged through water pipes and are in communication with the cooling water inlets, and the cooling water outlets are connected to the cooling tower through water pipes; the cooling tower is further provided with a water supplement inlet and a water outlet; the water supplement inlet is in communication with a water source for supplementing cooling water, and the water outlet is connected to a rainwater drainage pipe network. By parallel operation of at least three cooling water pumps, the supply amount and circulation speed of cooling water are significantly improved, thereby enhancing the heat exchange efficiency between the tail gas and the cooling water. In addition, the redundant design of multiple cooling water pumps ensures that other water pumps can continue to work even if one of the water pumps fails, ensuring the continuity and stability of the cooling water supply. This reduces the risk of system downtime maintenance and improves the reliability and safety of the tail gas treatment process. The communication of the water supplement inlet with the water source and the connection of the water outlet to the rainwater drainage pipe network realize the recycling and reasonable discharge of cooling water. This not only reduces the waste of water resources, but also reduces the impact on the environment, in line with the current development trend of water saving and green production.

[0018] As a further improvement of the above scheme, each flushing device comprises a flushing main pipe and a plurality of flushing branch pipes connected to the flushing main pipe; the flushing main pipe is perpendicular to each flushing branch pipe, and each flushing branch pipe is arranged in parallel to the other flushing branch pipes; a plurality of flushing heads are arranged on the flushing branch pipes, the flushing heads comprise large flushing heads and small flushing heads, and flushing water is sprayed from each flushing head towards the heat exchange plates or the heat exchange core. By arranging the first flushing device in the gas-gas heat exchanger and the second flushing device in the gas-water heat exchanger, the heat exchanger is regularly sprayed and cleaned, which effectively avoids the problem of nodules formed by the attachment of detergent particles on the heat exchange plates or the heat exchange core, ensures the stability of heat exchange efficiency and the smooth operation of the system, reduces production interruptions caused by equipment failure, and improves overall production efficiency.

[0019] As a further improvement of the above scheme, the fourth pipe is vertically arranged, and the bottom of the fourth pipe is further provided with a water collecting part for collecting the flushing water.

[0020] As a further improvement of the above scheme, the bottom of the gas-water heat exchanger is further provided with a drain groove, the drain groove is provided with a drain hole, and the drain hole is located on the side of the air inlet; the bottom of the drain groove is a downward inclined surface structure inclined from one end of the air outlet to one end of the air inlet.

[0021] Beneficial effects:

[0022] (1) Efficient recovery and utilization of waste heat: By arranging a gas-gas heat exchanger, the waste heat in the tail gas of the detergent spray drying tower is effectively recovered and used to preheat the cold air entering the hot blast furnace. This design not only reduces the dependence of the hot blast furnace on fresh heat sources and reduces energy consumption, but also significantly improves energy utilization efficiency, helps to reduce greenhouse gas emissions, and conforms to the concept of green and sustainable development.

[0023] (2) Tail gas condensation and resource saving: After the detergent spray drying tower tail gas is preliminarily purified by a cyclone separator, it enters the gas-gas heat exchanger for further cooling. This process not only helps to condense the water vapor carried in the tail gas and reduces energy waste caused by direct water vapor emission, but also reduces the temperature of the tail gas and reduces the burden on the subsequent plasma air purification device, prolonging the service life of the equipment.

[0024] (3) Preventing detergent nodules: By arranging the first flushing device in the gas-gas heat exchanger and the second flushing device in the gas-water heat exchanger, the heat exchanger is regularly sprayed and cleaned, which effectively avoids the problem of nodules formed by the attachment of detergent particles on the heat exchange plates or the heat exchange core, ensures the stability of heat exchange efficiency and the smooth operation of the system, reduces production interruptions caused by equipment failure, and improves overall production efficiency.

[0025] (4) Deep purification and environmental protection: the tail gas is further cooled by the steam-water heat exchanger, and then enters the plasma air purification device for deep purification, so that the micro particles and harmful gases in the tail gas are effectively removed, the cleanliness of the exhaust gas is ensured, and the pollution to the environment is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a system principle diagram of the utility model;

[0027] Figure 2 is a structure schematic view of the cyclone separator of the utility model;

[0028] Figure 3 is a structure schematic view of the gas-gas heat exchanger of the utility model;

[0029] Figure 4 is a structure schematic view of the steam-water heat exchanger of the utility model;

[0030] Figure 5 is a structure schematic view of the cooling water supply equipment of the utility model;

[0031] Figure 6 is a structure schematic view of the flushing device of the utility model;

[0032] REFERENCE SIGNS:

[0033] G1, first pipeline; G2, second pipeline; G21, tail gas main pipe; G22, tail gas branch pipe; G23, exhaust port; G3, third pipeline; G4, fourth pipeline; G41, water collecting part;

[0034] H1, first merging pipeline; H2, second merging pipeline; K1, first opening; K2, second opening; F1, fan;

[0035] 1, powder spraying drying tower; 11, tail gas outlet;

[0036] 2, hot blast stove; 21, blast furnace outlet; 22, blast furnace inlet;

[0037] 3a, first cyclone separator; 3b, second cyclone separator; 31, support; 32, separator main body; 321, upper cavity; 322, lower cavity; 33, dust collecting box;

[0038] 4a, first gas-gas heat exchanger; 4b, second gas-gas heat exchanger; 41, heat exchange plate; 42, cold air inlet; 43, cold air outlet; 44, hot air inlet; 45, hot air outlet;

[0039] 5a. First steam-water heat exchanger; 5b. Second steam-water heat exchanger; 51. Heat exchange core; 511. Cooling water inlet; 512. Cooling water outlet; 52. Air inlet; 53. Air outlet; 54. Cooling water supply equipment; 541. Cooling tower; 542. Cooling water pump; 543. Water inlet; 544. Drain outlet; 55. Drainage trough; 551. Drain hole;

[0040] 6. Plasma air purification device;

[0041] 7a. First shower device; 7b. Second shower device; 71. Main shower pipe; 72. Branch shower pipe; 73. Shower head. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Example:

[0044] like Figures 1-6 As shown, a waste heat recovery and condensation cooling system for the exhaust gas of a laundry detergent spray drying tower includes a spray drying tower 1 and a hot air furnace 2. The hot air furnace 2 is provided with a furnace outlet 21 and a furnace inlet 22. The hot air furnace 2 is connected to the spray drying tower 1 through the furnace outlet 21 to provide drying hot air to the spray drying tower 1. The spray drying tower 1 is provided with an exhaust gas outlet 11. The exhaust gas outlet 11 is connected to the inlet of a cyclone separator through a first pipe G1. The outlet of the cyclone separator is connected to a gas-to-gas heat exchanger through a second pipe G2. In this embodiment, the cyclone separator includes a support 31 and a separator body 32 mounted on the support 31. The separator body 32 has a hollow cyclone separation chamber with an inlet and an outlet at its upper part. The cyclone separation chamber includes an upper chamber 321 and a lower chamber 322 connected vertically. The upper chamber 321 is cylindrical, and the lower chamber 322 is a conical structure that is wider at the top and narrower at the bottom. A dust collection box 33 is also provided at the bottom of the lower chamber 322 for collecting dust. By adopting a conical structure that is wider at the top and narrower at the bottom in the lower chamber 322, the rotation effect of the exhaust gas in the cyclone separation chamber is greatly enhanced, so that the dust particles in the exhaust gas are effectively separated and deposited at the bottom of the conical lower chamber 322, thereby significantly improving the dust separation efficiency.

[0045] In the embodiment, the cyclone separators include a first cyclone separator 3a and a second cyclone separator 3b, the input ports of the two cyclone separators are oppositely arranged and are communicated with each other through a first merging pipe H1, a first opening K1 is arranged in the middle of the first merging pipe H1, and the first opening K1 is communicated with the first pipe G1. The oppositely arranged and communicated design of the first cyclone separator 3a and the second cyclone separator 3b forms a more efficient tail gas treatment path. The tail gas can experience twice efficient particle separation process when passing through the two cyclone separators, the fine dust and the laundry detergent particles which are not completely dried in the tail gas are effectively removed, the tail gas purification effect is significantly improved, and the environmental pollution is reduced. In the embodiment, the second pipe G2 includes a tail gas main pipe G21, one end of the tail gas main pipe G21 is communicated with the output ports of the cyclone separators respectively, an exhaust port G23 is further arranged on the side of the tail gas main pipe G21, the exhaust port G23 is located on the side close to the output ports of the cyclone separators, and the other end of the tail gas main pipe G21 is provided with two tail gas branch pipes G22, the tail gas branch pipes G22 are provided with air valves and are communicated with the hot air inlets 44 of the first air-air heat exchanger 4a and the second air-air heat exchanger 4b respectively.

[0046] The air-air heat exchanger is internally provided with a plurality of heat exchange plates 41 which are parallel to each other, the air-air heat exchanger is provided with a cold air inlet 42 and a cold air outlet 43 in the transverse direction, the cold air outlet 43 is provided with a fan F1, the fan F1 is communicated with the air furnace inlet 22 of the hot air furnace 2 through a third pipe G3, fresh air is introduced from the cold air inlet 42, and the fresh air is conducted to the hot air furnace 2 from the cold air outlet 43 after heat exchange, so that the fresh air is preheated and provided for the hot air furnace 2, the hot air furnace 2 converts the preheated fresh air into the drying hot air, the air-air heat exchanger is provided with a hot air inlet 44 and a hot air outlet 45 in the longitudinal direction, the hot air inlet 44 is communicated with the second pipe G2, and the hot air outlet 45 is communicated with the steam-water heat exchanger through a fourth pipe G4, in the embodiment, the fourth pipe G4 is vertically arranged, and the bottom of the fourth pipe G4 is further provided with a water collecting part G41 which is used for collecting the shower water. The air-air heat exchanger is internally provided with a first shower device 7a, the first shower device 7a is arranged above the heat exchange plates 41, and the plane on which the first shower device 7a is arranged is perpendicular to the heat exchange plates 41.

[0047] The steam-water heat exchanger is internally provided with a plurality of heat exchange cores 51 which are parallel to each other, and is provided with an air inlet 52 and an air outlet 53 in the transverse direction, the air inlet 52 is communicated with the side wall of the fourth pipeline G4, the air outlet 53 is communicated with the input port of the plasma air purification device 6, and the output port of the plasma air purification device 6 is communicated with the outside air; the steam-water heat exchanger is further provided with a second flushing device 7b, the second flushing device 7b is located between adjacent heat exchange cores 51, and the plane where the second flushing device 7b is located is parallel to the plane where the heat exchange core 51 is located. In this embodiment, the steam-water heat exchanger is further provided with a drain groove 55 at the bottom, the drain groove 55 is provided with a drain hole 551, and the drain hole 551 is located at the side of the air inlet 52; the bottom of the drain groove 55 is a downward inclined surface structure, which is inclined from one end of the air outlet 53 to one end of the air inlet 52.

[0048] In this embodiment, the air-air heat exchanger includes a first air-air heat exchanger 4a and a second air-air heat exchanger 4b, and the cold air outlets 43 of the two air-air heat exchangers are oppositely arranged and communicated with each other through a second merging pipeline H2; the middle part of the second merging pipeline H2 is provided with a second opening K2, the input port of the fan F1 is communicated with the second opening K2, and the output port of the fan F1 is communicated with the third pipeline G3.

[0049] The steam-water heat exchanger includes a first steam-water heat exchanger 5a and a second steam-water heat exchanger 5b, and the air inlets 52 of the steam-water heat exchangers are communicated with the corresponding hot air outlets 45 of the first air-air heat exchanger 4a and the second air-air heat exchanger 4b; the air outlets 53 of the steam-water heat exchangers are communicated to the plasma air purification device 6 after being merged.

[0050] The cold air outlets 43 of the first air-air heat exchanger 4a and the second air-air heat exchanger 4b are oppositely arranged and communicated with each other through the second merging pipeline H2, which not only ensures the effective capture of heat in the tail gas, but also effectively recovers the residual heat in the tail gas of the powder spraying drying tower 1 through the connection between the second opening K2 and the input port of the fan F1, and is used for preheating the cold air entering the hot blast stove 2, thereby reducing energy consumption, significantly improving energy utilization efficiency, helping to reduce greenhouse gas emissions, and meeting the green and sustainable development concept. In addition, the parallel use of the double air-air heat exchanger and the double steam-water heat exchanger enhances the redundancy and fault tolerance of the system. Even if one of the heat exchangers fails, the other can still work, ensuring the continuity and stability of the tail gas treatment, and reducing the risk of system downtime maintenance.

[0051] In this embodiment, the heat exchange core 51 is connected with the cooling water supply device 54; the heat exchange core 51 is a finned tube, arranged in a plate shape in the steam-water heat exchanger, the lower end of the heat exchange core 51 is provided with a cooling water inlet 511, the upper end of the heat exchange core 51 is provided with a cooling water outlet 512, the cooling water inlet 511 and the cooling water outlet 512 are respectively connected with the cooling water supply device 54 through water pipes. In this embodiment, the cooling water supply device 54 includes at least three cooling water pumps 542, the pump inlet of each cooling water pump 542 is connected with the cooling tower 541, the pump outlets of the cooling water pumps 542 are connected with the cooling water inlets 511 through water pipes, and the cooling water outlets 512 are connected with the cooling tower 541 through water pipes; the cooling tower 541 is also provided with a water supplement inlet 543 and a water outlet 544; the water supplement inlet 543 is connected with a water source and used for supplementing cooling water; and the water outlet 544 is connected with a rainwater drainage pipe network. Through the parallel operation of the at least three cooling water pumps 542, the supply amount and circulation speed of the cooling water are significantly improved, so that the heat exchange efficiency between the tail gas and the cooling water is enhanced. In addition, the redundant design of the multiple cooling water pumps 542 ensures that other water pumps can continue to work even if one of the water pumps fails, thereby ensuring the continuity and stability of the cooling water supply. This reduces the risk of system downtime maintenance and improves the reliability and safety of the tail gas treatment process. The connection of the water supplement inlet 543 with the water source and the connection of the water outlet 544 with the rainwater drainage pipe network realize the recycling and reasonable discharge of the cooling water. This not only reduces the waste of water resources, but also reduces the impact on the environment, in line with the current development trend of water saving and green production.

[0052] In this embodiment, each flushing device includes a flushing main pipe 71 and a plurality of flushing branch pipes 72 connected with the flushing main pipe 71; the flushing main pipe 71 is perpendicular to each flushing branch pipe 72, and each flushing branch pipe 72 is arranged in parallel with each other; a plurality of flushing heads 73 are arranged on the flushing branch pipe 72, the flushing heads 73 include large flushing heads 73 and small flushing heads 73, and flushing water is sprayed from each flushing head 73 towards the heat exchange plate 41 or the heat exchange core 51. By arranging the first flushing device 7a in the gas-gas heat exchanger and the second flushing device 7b in the steam-water heat exchanger, the heat exchanger is regularly sprayed and cleaned, which effectively avoids the problem of nodules formed by the attachment of washing powder particles on the heat exchange plate 41 or the heat exchange core 51, ensures the stability of the heat exchange efficiency and the smooth operation of the system, reduces the production interruption caused by equipment failure, and improves the overall production efficiency.

[0053] Through the above scheme of the utility model, in specific application: the tail gas discharged from the powder spraying drying tower 1 on the washing powder production line still contains a large amount of water and washing powder particles, it is necessary to deeply optimize and treat the tail gas, eliminate odor and white mist, and reduce particulate matter emission.

[0054] The tail gas from the powder spraying drying tower 1 has a high temperature of about 80 degrees, and after the cyclone separator, the dust is effectively reduced. The high-temperature tail gas continues to be introduced into the gas-gas heat exchanger, and the fresh air is introduced from the cold air inlet 42 and heated to about 55 degrees by heat exchange with the tail gas, effectively realizing the preheating of the fresh air. The preheated fresh air is discharged from the cold air outlet 43 and transported to the hot blast stove 2 through the third pipeline G3, not only reducing the dependence of the hot blast stove 2 on fresh heat sources and reducing energy consumption, but also significantly improving energy utilization efficiency, helping to reduce greenhouse gas emissions, and meeting the green and sustainable development concept.

[0055] At this time, the tail gas temperature is reduced to about 62 degrees, and the steam-water condenser is cooled by the cooling tower 541 water to reduce the temperature to 45 degrees, and 80% of the water and part of the particulate matter are precipitated. After removing the water, the white mist in the tail gas can be effectively eliminated. After the temperature is reduced to 45 degrees, the tail gas goes to the plasma air purification device 6 at the rear end for deodorization treatment. Otherwise, the high-temperature and high-humidity tail gas directly entering the plasma air purification device 6 is easy to burn out, and it also cannot achieve the effect of removing white mist and removing odor at one time. The laundry detergent powder spraying drying tower 1 tail gas is preliminarily purified by the cyclone separator and then enters the gas-gas heat exchanger for further cooling. This process not only helps to condense the water vapor carried in the tail gas, reduces the energy waste caused by direct emission of water vapor, but also reduces the temperature of the tail gas, reduces the burden of the subsequent plasma air purification device 6, and prolongs the service life of the equipment.

[0056] At the same time, by setting the first flushing device 7a in the gas-gas heat exchanger and the second flushing device 7b in the steam-water heat exchanger, the heat exchanger is periodically sprayed and cleaned, effectively avoiding the problem of nodules formed by laundry detergent particles adhering to the heat exchange plates 41 or heat exchange cores 51, ensuring the stability of the heat exchange efficiency and the smooth operation of the system, reducing the production interruption caused by equipment failure, and improving the overall production efficiency.

[0057] According to the disclosure and teaching of the above description, those skilled in the art of the present application can also make changes and modifications to the above embodiments. Therefore, the present application is not limited to the specific embodiments disclosed and described above. Some modifications and changes of the application should also fall within the protection scope of the claims of the application. In addition, although some specific terms are used in the specification, these terms are only for convenience of explanation and do not constitute any limitation on the application.

Claims

1. A waste heat recovery and condensation cooling system for the exhaust gas of a laundry detergent spray drying tower, comprising a spray drying tower and a hot air furnace, wherein the hot air furnace has a furnace outlet and a furnace inlet, and the hot air furnace is connected to the spray drying tower through the furnace outlet to provide drying hot air to the spray drying tower; the spray drying tower has an exhaust gas outlet, characterized in that: The tail gas outlet is connected with the input port of the cyclone separator through a first pipeline, and the output port of the cyclone separator is connected with the gas-gas heat exchanger through a second pipeline; The gas-gas heat exchanger is internally provided with a plurality of heat exchange plates parallel to each other, and the gas-gas heat exchanger is provided with a cold air inlet and a cold air outlet in the transverse direction, and a fan is arranged at the cold air outlet and connected with the air inlet of the hot blast furnace through a third pipeline; fresh air is introduced from the cold air inlet, and after heat exchange, the fresh air is introduced from the cold air outlet to the hot blast furnace to provide preheated fresh air for the hot blast furnace; the hot blast furnace converts the preheated fresh air into the drying hot blast; the gas-gas heat exchanger is provided with a hot air inlet and a hot air outlet in the longitudinal direction, the hot air inlet is connected with the second pipeline, and the hot air outlet is connected with the steam-water heat exchanger through a fourth pipeline; the gas-gas heat exchanger is provided with a first flushing device, and the first flushing device is arranged above the heat exchange plates, and the plane of the first flushing device is perpendicular to the heat exchange plates; The steam-water heat exchanger is internally provided with a plurality of heat exchange cores parallel to each other, and the steam-water heat exchanger is provided with an air inlet and an air outlet in the transverse direction, the air inlet is connected with the side wall of the fourth pipeline, and the air outlet is connected with the input port of the plasma air purification device, and the output port of the plasma air purification device is connected with the outside air; the steam-water heat exchanger is further provided with a second flushing device, and the second flushing device is located between adjacent heat exchange cores, and the plane of the second flushing device is parallel to the plane of the heat exchange cores.

2. The waste heat recovery condensing cooling system of the exhaust gas of a laundry detergent powder spraying drying tower according to claim 1, characterized in that, The cyclone separator comprises a first cyclone separator and a second cyclone separator, and the input ports of the two cyclone separators are oppositely arranged and connected with each other through a first merging pipeline; a first opening is arranged in the middle of the first merging pipeline, and the first opening is connected with the first pipeline.

3. The laundry detergent spray-drying tower tail gas waste heat recovery condensing cooling system according to claim 2, characterized in that, The gas-gas heat exchanger comprises a first gas-gas heat exchanger and a second gas-gas heat exchanger, and the cold air outlets of the two gas-gas heat exchangers are oppositely arranged and connected with each other through a second merging pipeline; a second opening is arranged in the middle of the second merging pipeline, the input port of the fan is connected with the second opening, and the output port of the fan is connected with the third pipeline; The steam-water heat exchanger comprises a first steam-water heat exchanger and a second steam-water heat exchanger, and the air inlets of the steam-water heat exchangers are connected with the corresponding hot air outlets of the first gas-gas heat exchanger and the second gas-gas heat exchanger; the air outlets of the steam-water heat exchangers are connected with the plasma air purification device after being merged.

4. The laundry detergent powder spray drying tower tail gas waste heat recovery condensing cooling system according to claim 3, characterized in that, The second pipeline comprises a tail gas main pipe, one end of the tail gas main pipe is connected with the output ports of the cyclone separators, and the side of the tail gas main pipe is further provided with an exhaust port, the exhaust port is located on the side close to the output ports of the cyclone separators; the other end of the tail gas main pipe is provided with two tail gas branch pipes, the tail gas branch pipes are provided with air valves and are connected with the hot air inlets of the first gas-gas heat exchanger and the second gas-gas heat exchanger.

5. The waste heat recovery condensing cooling system of laundry powder spray drying tower exhaust gas according to claim 1 or 4, characterized in that, The cyclone separator comprises a support and a separator main body arranged on the support; the separator main body has a hollow cyclone separation cavity, the cyclone separation cavity is provided with an input port and an output port at the upper portion thereof; the cyclone separation cavity comprises an upper cavity portion and a lower cavity portion which are connected in sequence, the upper cavity portion is in a cylindrical shape, and the lower cavity portion is in a tapered structure which is wide at the upper portion and narrow at the lower portion; the bottom of the lower cavity portion is further provided with an ash collecting box, and the ash collecting box is used for collecting dust.

6. The laundry detergent spray-drying tower tail gas waste heat recovery condensing cooling system according to claim 1, characterized in that, The heat exchange core is connected with the cooling water supply device; the heat exchange core is a finned tube and is arranged in a plate shape in the steam-water heat exchanger; the lower end of the heat exchange core is provided with a cooling water inlet, and the upper end of the heat exchange core is provided with a cooling water outlet; the cooling water inlet and the cooling water outlet are respectively connected with the cooling water supply device through water pipes.

7. The laundry detergent spray-drying tower tail gas waste heat recovery condensing cooling system according to claim 6, characterized in that, The cooling water supply device comprises at least three cooling water pumps, the pump inlets of the cooling water pumps are connected with the cooling tower, the pump outlets of the cooling water pumps are connected with the cooling water inlets through water pipes, and the cooling water outlets are connected with the cooling tower through water pipes; the cooling tower is further provided with a water supplement inlet and a water outlet; the water supplement inlet is connected with a water source and is used for supplementing cooling water; and the water outlet is connected with a rainwater drainage pipe network.

8. The laundry detergent spray-drying tower tail gas waste heat recovery condensing cooling system according to claim 1, characterized in that, Each flushing device comprises a flushing main pipe and a plurality of flushing branch pipes which are connected with the flushing main pipe; the flushing main pipe and each flushing branch pipe are perpendicular to each other, and each flushing branch pipe is arranged in parallel with each other; a plurality of flushing heads are arranged on the flushing branch pipe, the flushing heads comprise large flushing heads and small flushing heads, and flushing water is sprayed from each flushing head towards the heat exchange plate or the heat exchange core.

9. The laundry detergent spray-drying tower tail gas waste heat recovery condensing cooling system according to claim 8, characterized in that, The fourth pipeline is arranged vertically, and the bottom of the fourth pipeline is further provided with a water collecting portion which is used for collecting the flushing water.

10. The laundry detergent spray-drying tower tail gas waste heat recovery condensing cooling system according to claim 8, characterized in that, The bottom of the steam-water heat exchanger is further provided with a drainage groove, the drainage groove is provided with a drainage hole, and the drainage hole is located on the side of the air inlet; the bottom of the drainage groove is in a downward inclined surface structure and is inclined from one end of the air outlet to one end of the air inlet.

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