CN215741837U

CN215741837U - Hot-blast furnace heating type waste gas circulated spray drying system

Info

Publication number: CN215741837U
Application number: CN202122348713.5U
Authority: CN
Inventors: 孙绍堂; 莫汉池; 董学勇
Original assignee: Guangzhou JP EPE Co Ltd
Current assignee: Guangzhou JP EPE Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-02-08
Anticipated expiration: 2031-09-27

Abstract

The utility model relates to the technical field of powder production equipment, and discloses a hot blast stove heating type spray drying system with circulated waste gas, which comprises a spray drying tower, a material collecting component and a waste gas treatment component, wherein liquid materials introduced into the spray drying tower can be dehydrated into powder materials, a dust remover of the material collecting component is communicated with the spray drying tower, a material receiving cyclone dust remover is communicated with the dust remover, and the dust remover can separate the powder materials from air flow mixed with the powder materials and send the powder materials to the material receiving cyclone dust remover for collection. Can cool off the dehumidification to the air current in the cooling module of exhaust-gas treatment subassembly, the air-heating furnace in the return-air box of return-air subassembly can absorb the air current in the return-air box and heat, and the air current after the heating lets in the air inlet of spray drying tower once more, realizes the recycling of air current, has avoided the emission of waste gas, not only is favorable to improving operating personnel's operational environment, has still avoided the pollution to the environment.

Description

Hot-blast furnace heating type waste gas circulated spray drying system

Technical Field

The utility model relates to the technical field of powder production equipment, in particular to a spray drying system with a heating type hot blast stove and recyclable waste gas.

Background

At present, some powder materials are often quickly dried by a spray drying tower, hot air is introduced into the spray drying tower, the materials are pumped into the spray drying tower and atomized into small liquid drops through an atomizer, the small liquid drops are small in diameter and large in surface area, moisture in the small liquid drops absorbs heat of the hot air and is rapidly gasified and evaporated after the small liquid drops are contacted with the high-temperature hot air, and the materials in the small liquid drops are dehydrated to form the powder materials. Can produce a large amount of stoving waste gas in this production process, because stoving waste gas temperature is higher, and wherein can be mingled with the powder material, not only make operating personnel's operational environment worsen after discharging, still can cause the pollution to the surrounding environment.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a spray drying system with a circulated hot-blast stove heating type waste gas, which can realize the recycling and zero emission of the waste gas, is beneficial to improving the working environment of operators and avoids the pollution to the environment.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a hot blast stove heated exhaust gas recyclable spray drying system comprising: the spray drying tower is filled with liquid materials, and the liquid materials are dehydrated into powder materials in the spray drying tower; the material collecting component comprises a dust remover and a material collecting cyclone dust remover, the dust remover is communicated with the spray drying tower, an air inlet of the material collecting cyclone dust remover is communicated with a discharge opening of the dust remover, an air outlet of the material collecting cyclone dust remover is communicated with the dust remover, and the dust remover can separate the powder materials from the air flow mixed with the powder materials and send the powder materials to the material collecting cyclone dust remover; the waste gas treatment assembly comprises a cooling assembly and an air return assembly, the air return assembly is communicated with the cooling assembly, an air inlet of the cooling assembly is communicated with an air outlet of the dust remover, an air outlet of the cooling assembly is communicated with an air inlet of the material receiving cyclone dust remover, and the cooling assembly can cool and dehumidify the air flow sent by the dust remover; the air return assembly comprises an air return box, a hot blast stove is arranged in an inner cavity of the air return box, the hot blast stove can suck air flow in the air return box and heat the air flow, and an air outlet of the hot blast stove is communicated with an air inlet of the spray drying tower.

As a preferred scheme of a hot blast stove heating type spray drying system with waste gas circulation, the cooling assembly comprises a heat exchange box, a heat regenerator and a primary surface cooler, the heat regenerator and the primary surface cooler are both arranged in an inner cavity of the heat exchange box, a cooling tower can feed cooling water into the primary surface cooler through a water pump, an air outlet of the dust remover is communicated with an air inlet of the heat exchange box, and an air outlet of the heat exchange box is communicated with an air inlet of the material receiving cyclone dust remover; and a baffle is arranged in the inner cavity of the heat exchange box, and the baffle enables the airflow entering the inner cavity of the heat exchange box by the dust remover to sequentially pass through the heat regenerator and the primary surface cooler and then enter the material collecting cyclone dust remover.

As a preferred scheme of the spray drying system with the heating type hot blast stove and the circulated waste gas, the cooling assembly further comprises a secondary heat exchanger and a compressor, the secondary heat exchanger and the compressor are arranged in the inner cavity of the heat exchange box and located at the downstream of the primary surface air cooler, and the compressor can circularly introduce a refrigerant which exchanges heat with the airflow into the secondary heat exchanger.

As a preferable scheme of the hot blast stove heating type spray drying system with exhaust gas circulations, the heat regenerator is installed at a communication part of the air return box and the heat exchange box, and the heat regenerator can heat the air flow flowing into the air return box.

As an optimal scheme of a hot blast stove heating type spray drying system with circulated waste gas, the material collecting assembly further comprises a collecting pipeline and a material collecting fan, one end of the collecting pipeline is communicated with the gas outlet of the heat exchange box, the other end of the collecting pipeline is communicated with the gas inlet of the material collecting cyclone dust collector, the gas outlet of the material collecting cyclone dust collector is communicated with the gas inlet of the material collecting fan, the gas outlet of the material collecting fan is communicated with the gas inlet of the dust collector, and the discharge port of the dust collector is communicated with the collecting pipeline.

As an optimal scheme of a spray drying system with a hot blast stove heating type waste gas capable of being circulated, the material collecting assembly further comprises a tertiary heat exchanger and a condenser, the tertiary heat exchanger and the condenser are arranged in an inner cavity of the heat exchange box and located at an air outlet of the heat exchange box, and air flow in the inner cavity of the heat exchange box sequentially passes through the tertiary heat exchanger and enters the collecting pipeline after the condenser.

As an optimal scheme of a spray drying system with a hot blast stove heating type waste gas capable of being circulated, the dust remover comprises a cyclone dust remover, a primary pulse bag dust remover and a secondary pulse bag dust remover which are connected in sequence, an air inlet of the cyclone dust remover is communicated with a spray drying tower, an air outlet of the secondary pulse bag dust remover is communicated with an air inlet of a heat exchange box, and a discharge opening of the cyclone dust remover, a discharge opening of the primary pulse bag dust remover and a discharge opening of the secondary pulse bag dust remover are all communicated with a collecting pipeline.

As an optimal scheme of the spray drying system with the heating type waste gas of the hot blast stove capable of being circulated, the material collecting assembly further comprises a circulating fan, an air inlet of the circulating fan is communicated with an air outlet of the secondary pulse bag-type dust collector, and an air outlet of the circulating fan is communicated with an air inlet of the heat exchange box.

As a preferred scheme of the spray drying system with the heating type hot blast stove and the circulated waste gas, the air inlet of the heat exchange box is provided with a filter.

As a preferable scheme of the spray drying system with the circulated hot-blast stove heating type waste gas, the spray drying system with the circulated hot-blast stove heating type waste gas further comprises a raw material tank and a feeding pump, wherein the feeding pump is communicated between the raw material tank and the spray drying tower, and the feeding pump can feed the liquid material in the raw material tank into the spray drying tower.

The utility model has the beneficial effects that:

the utility model provides a spray drying system with circulated hot blast stove heating type waste gas, which comprises a spray drying tower, a material collecting component and a waste gas treatment component, wherein liquid materials introduced into the spray drying tower can be dehydrated into powder materials, a dust remover of the material collecting component is communicated with the spray drying tower, a material collecting cyclone dust remover is communicated with the dust remover, and the dust remover can separate the powder materials from air flow mixed with the powder materials and send the powder materials to the material collecting cyclone dust remover for collection. Can cool off the dehumidification to the air current in the cooling module of exhaust-gas treatment subassembly, the air-heating furnace in the return-air box of return-air subassembly can absorb the air current in the return-air box and heat, and the air current after the heating lets in the air inlet of spray drying tower once more, realizes the recycling of air current, has avoided the emission of waste gas, not only is favorable to improving operating personnel's operational environment, has still avoided the pollution to the environment.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a spray drying system with a heating type exhaust gas recycling function of a hot blast stove provided by an embodiment of the utility model.

In the figure:

1. a feed pump; 2. a spray drying tower; 3. a cyclone dust collector; 4. a primary pulse bag-type dust collector; 5. a secondary pulse bag-type dust collector; 6. a circulating fan; 7. a heat regenerator; 8. a primary surface cooler; 9. a secondary heat exchanger; 10. a cooling tower; 11. a water pump; 12. a raw material tank; 13. a material receiving cyclone dust collector; 14. a material receiving fan; 15. a hot blast stove; 16. a compressor; 17. a tertiary heat exchanger; 18. a condenser; 19. a filter; 20. a baffle plate; 21. an air blower.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first feature is directly connected to the second feature, or that the first feature is not directly connected to the second feature but is connected to the second feature via another feature. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the spray drying system with the heating type waste gas circulation of the hot blast stove provided by the utility model is further described by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1, the present embodiment provides a spray drying system in which hot-blast stove heating type exhaust gas can be circulated, this hot-blast furnace adds fever type waste gas circulated spray drying system includes spray drying tower 2, subassembly and exhaust-gas treatment subassembly are collected to the material, the exhaust-gas treatment subassembly includes cooling module and return air subassembly, let in liquid material in spray drying tower 2, liquid material can dewater into powder material in spray drying tower 2, the material is collected the subassembly and is linked together between spray drying tower 2 and cooling module, the material is collected the subassembly and can is separated out and collect powder material from the air current that thoughtlessly has powder material with powder material, return air subassembly communicates between cooling module and spray drying tower 2, cooling module communicates in the material collection subassembly, cooling module is used for cooling down the dehumidification to the air current, the return air subassembly is used for heating the air current after cooling down the dehumidification and will the air current flow to spray drying tower 2 in. Through the structure, the air flow in the spray drying system with the circulated hot-blast stove heating type waste gas realizes the recycling, avoids the emission of the waste gas, is favorable for improving the working environment of operators and also avoids the pollution to the environment.

In this embodiment, the material collection subassembly includes the dust remover and receives material cyclone 13, and the air inlet of dust remover and the gas outlet intercommunication of spray drying tower 2 receive the air inlet of material cyclone 13 and communicate in the discharge opening of dust remover, and the dust remover can separate out and unload the powder material to receiving material cyclone 13 with the powder material from the air current that thoughtlessly has the powder material, realizes the collection of powder material. It will be appreciated that other dust collectors (e.g. pulse dust collectors) may be used instead of the collecting cyclone 13, as long as the powder material in the gas flow can be collected.

Specifically, the material collecting assembly further comprises a collecting pipeline and a material receiving fan 14, one end of the collecting pipeline is communicated with the cooling assembly, the other end of the collecting pipeline is communicated with an air inlet of the material receiving cyclone dust collector 13, an air outlet of the material receiving cyclone dust collector 13 is communicated with an air inlet of the material receiving fan 14, an air outlet of the material receiving fan 14 is communicated with an air inlet of the dust collector, a discharge opening of the dust collector is communicated with the collecting pipeline, so that the material receiving fan 14 can suck air from air flow after cooling and dehumidification in the cooling assembly during working, powder materials discharged from the dust collector are conveyed to the material receiving cyclone dust collector 13 through the collecting pipeline by utilizing the air flow to be subjected to concentrated material receiving packaging, and circulating air flow enters the dust collector for circulation through the material receiving fan 14 after being separated from the powder materials.

Preferably, the dust remover comprises a cyclone dust remover 3, a primary pulse bag-type dust remover 4 and a secondary pulse bag-type dust remover 5 which are connected in sequence, an air inlet of the cyclone dust remover 3 is communicated with an air outlet of the spray drying tower 2, an air outlet of the secondary pulse bag-type dust remover 5 is communicated with the cooling component, a discharge opening of the cyclone dust remover 3, a discharge opening of the primary pulse bag-type dust remover 4 and a discharge opening of the secondary pulse bag-type dust remover 5 are all communicated with the collecting pipeline, the airflow with powder materials from the air outlet of the spray drying tower 2 passes through a cyclone dust collector 3, a primary pulse bag dust collector 4 and a secondary pulse bag dust collector 5 in sequence, so that the powder material in the airflow can be fully separated from the airflow and discharged and concentrated into a collecting pipeline, the collecting pipes are used for collecting materials in a centralized manner, so that the situation that a material collecting point is arranged at a discharge port of each dust remover is avoided.

Preferably, the material collecting assembly further comprises a circulating fan 6, an air inlet of the circulating fan 6 is communicated with an air outlet of the secondary pulse bag-type dust collector 5, an air outlet of the circulating fan 6 is communicated with the cooling assembly, namely, the circulating fan 6 is arranged between the air outlet of the secondary pulse bag-type dust collector 5 and the cooling assembly, and the air quantity required by material drying can be ensured.

In this embodiment, the cooling assembly includes a heat exchange box, a heat regenerator 7 and a primary surface cooler 8, the gas outlet of the secondary pulse bag-type dust collector 5 is communicated with the gas inlet of the heat exchange box, the gas outlet of the heat exchange box is communicated with the gas inlet of the material collecting cyclone dust collector 13, the heat regenerator 7 and the primary surface cooler 8 are both arranged in the inner cavity of the heat exchange box, the heat regenerator 7 is a gas-gas heat exchanger, and the heat regenerator 7 can reduce the temperature of the gas flow introduced into the inner cavity of the heat exchange box by the secondary pulse bag-type dust collector 5 by using low-temperature gas; the cooling tower 10 can let in cooling water to one-level surface cooler 8 through water pump 11, and the cooling water can be through one-level surface cooler 8 to the air current cools down to detach the partial moisture in the air current, can be through cooling tower 10 after the cooling water absorbs the heat and dispel the atmosphere with the heat. Preferably, the air inlet of the heat exchange box is provided with a filter 19 for filtering the air flow entering the cavity of the heat exchange box to prevent dust from entering the cavity of the heat exchange box. The filter 19 used in this embodiment is a primary-secondary-effect filter, and can prevent dust in the air flow from entering the inner cavity of the heat exchange box due to the damage of the bag-type dust remover.

Preferably, the baffle 20 is arranged in the inner cavity of the heat exchange box, and the baffle 20 enables airflow entering the inner cavity of the heat exchange box from the dust remover to sequentially pass through the heat regenerator 7 and the primary surface cooler 8 and then enter the material receiving cyclone dust remover 13, so that the airflow can be cooled in a stepped manner, and the cooling and dehumidifying effects are improved. Further, the cooling assembly further comprises a second-stage heat exchanger 9 and a compressor 16, the second-stage heat exchanger 9 and the compressor 16 are arranged in an inner cavity of the heat exchange box and located at the downstream of the first-stage surface cooler 8, the compressor 16 can circularly introduce a low-temperature refrigerant (such as Freon) which exchanges heat with the air flow into the second-stage heat exchanger 9, and the air flow is deeply cooled and dehumidified through heat exchange, so that the dehumidifying purpose of the air flow is achieved.

Furthermore, the material collecting assembly further comprises a tertiary heat exchanger 17 and a condenser 18, the tertiary heat exchanger 17 and the condenser 18 are both arranged in the inner cavity of the heat exchange box and are positioned at the air outlet of the heat exchange box, air flow in the inner cavity of the heat exchange box sequentially passes through the tertiary heat exchanger 17 and the condenser 18 and then enters a collecting pipeline, the tertiary heat exchanger 17 and the condenser 18 are both communicated with a compressor 16, the compressor 16 can circularly introduce a low-temperature refrigerant (such as Freon) which exchanges heat with the air flow into the tertiary heat exchanger 17, and the air flow is deeply dehumidified through heat exchange; the compressor 16 is capable of adjusting the temperature of the air flow by circulating a high-temperature refrigerant (for example, freon) that exchanges heat with the air flow into the condenser 18.

It will be appreciated that the secondary heat exchanger 9 and the condenser 18 belong to the same heat pump system, and the compressor 16 is capable of transferring heat from the air stream to the condenser 18 via the secondary heat exchanger 9, which is beneficial for energy saving.

In this embodiment, the exhaust-gas treatment subassembly still includes the return-air subassembly, the return-air subassembly includes the return-air case, return-air case and heat transfer case intercommunication, be equipped with hot-blast furnace 15 in the inner chamber of return-air case, hot-blast furnace 15 can absorb the air current in the return-air case and heat, hot-blast furnace 15's gas outlet communicates in the air inlet of spray drying tower 2, hot-blast furnace 15 can heat the air current that gets into in the return-air case, let in the air inlet of spray drying tower 2 once more through hot-blast furnace 15's gas outlet after making it reach required temperature. Further, the heat regenerator 7 is installed at the communication position of the air return box and the heat exchange box, and the heat regenerator 7 can heat and raise the temperature of the air flow flowing into the air return box, so as to facilitate the further heating of the subsequent hot blast stove 15. The hot blast stove 15 used in the present embodiment is a indirect-combustion hot blast stove, the fuel of the indirect-combustion hot blast stove may be natural gas, light oil or biomass gas provided by a biomass gasification furnace, and the flue gas after the fuel is combusted does not enter the air flow of the system.

More preferably, a blower 21 is arranged on a communication pipeline between the air outlet of the air return box and the air inlet of the spray drying tower 2, the air inlet of the blower 21 is communicated with the air outlet of the air return box, and the air outlet of the blower 21 is communicated with the air inlet of the spray drying tower 2, so that the pressure in the spray drying tower 2 can be ensured, and the normal operation of the spray drying tower 2 can be ensured.

In this embodiment, the hot-blast stove heating type spray drying system with circulated exhaust gas further includes a material tank 12 and a feeding pump 1, the feeding pump 1 is communicated between the material tank 12 and the spray drying tower 2, and the feeding pump 1 can feed the liquid material in the material tank 12 into the spray drying tower 2, so as to realize feeding of the liquid material.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hot blast stove heating type spray drying system with circulated exhaust gas is characterized by comprising:

the spray drying tower (2), wherein a liquid material is introduced into the spray drying tower (2), and the liquid material is dehydrated into a powder material in the spray drying tower (2);

the material collecting component comprises a dust remover and a material collecting cyclone dust remover (13), the dust remover is communicated with the spray drying tower (2), an air inlet of the material collecting cyclone dust remover (13) is communicated with a discharge opening of the dust remover, an air outlet of the material collecting cyclone dust remover (13) is communicated with the dust remover, and the dust remover can separate the powder material from the air flow mixed with the powder material and send the powder material to the material collecting cyclone dust remover (13);

the waste gas treatment assembly comprises a cooling assembly and an air return assembly, the air return assembly is communicated with the cooling assembly, an air inlet of the cooling assembly is communicated with an air outlet of the dust remover, an air outlet of the cooling assembly is communicated with an air inlet of the material receiving cyclone dust remover (13), and the cooling assembly can cool and dehumidify the air flow sent by the dust remover; the air return assembly comprises an air return box, a hot blast stove (15) is arranged in an inner cavity of the air return box, the hot blast stove (15) can suck air flow in the air return box and heat the air flow, and an air outlet of the hot blast stove (15) is communicated with an air inlet of the spray drying tower (2).

2. The hot blast stove heating type exhaust gas circulatable spray drying system according to claim 1, wherein the cooling assembly comprises a heat exchange box, a heat regenerator (7) and a primary surface cooler (8), the heat regenerator (7) and the primary surface cooler (8) are both arranged in an inner cavity of the heat exchange box, a cooling tower (10) can introduce cooling water into the primary surface cooler (8) through a water pump (11), an air outlet of the dust remover is communicated with an air inlet of the heat exchange box, and an air outlet of the heat exchange box is communicated with an air inlet of the material collecting cyclone (13); and a baffle (20) is arranged in the inner cavity of the heat exchange box, and the baffle (20) enables the airflow entering the inner cavity of the heat exchange box from the dust remover to sequentially pass through the heat regenerator (7) and the primary surface cooler (8) and then enter the material collecting cyclone dust remover (13).

3. The hot blast stove heated exhaust gas circulatable spray drying system of claim 2, wherein the cooling assembly further comprises a secondary heat exchanger (9) and a compressor (16), the secondary heat exchanger (9) and the compressor (16) being disposed in the inner cavity of the heat exchange box and downstream of the primary surface cooler (8), the compressor (16) being capable of circulating a refrigerant into the secondary heat exchanger (9) for heat exchange with the gas stream.

4. A hot blast stove-heated exhaust gas circulatable spray drying system according to claim 3, characterized in that the regenerator (7) is mounted at the connection of the return box and the heat exchange box, the regenerator (7) being capable of heating the gas flow flowing into the return box.

5. The hot blast stove heating type exhaust gas recyclable spray drying system according to claim 2, wherein the material collecting assembly further comprises a collecting pipe and a material collecting fan (14), one end of the collecting pipe is communicated with the gas outlet of the heat exchange box, the other end of the collecting pipe is communicated with the gas inlet of the material collecting cyclone (13), the gas outlet of the material collecting cyclone (13) is communicated with the gas inlet of the material collecting fan (14), the gas outlet of the material collecting fan (14) is communicated with the gas inlet of the dust remover, and the discharge port of the dust remover is communicated with the collecting pipe.

6. The hot blast stove-heated exhaust gas circulatable spray drying system of claim 5, wherein the material collection assembly further comprises a tertiary heat exchanger (17) and a condenser (18), both the tertiary heat exchanger (17) and the condenser (18) are disposed in the inner cavity of the heat exchange box and located at the gas outlet of the heat exchange box, and the gas flow in the inner cavity of the heat exchange box sequentially passes through the tertiary heat exchanger (17) and the condenser (18) and then enters the collection pipeline.

7. The hot blast stove heating type spray drying system with exhaust gas circulation according to claim 5, wherein the dust remover comprises a cyclone dust remover (3), a primary pulse bag dust remover (4) and a secondary pulse bag dust remover (5) which are connected in sequence, an air inlet of the cyclone dust remover (3) is communicated with the spray drying tower (2), an air outlet of the secondary pulse bag dust remover (5) is communicated with an air inlet of the heat exchange box, and a discharge opening of the cyclone dust remover (3), a discharge opening of the primary pulse bag dust remover (4) and a discharge opening of the secondary pulse bag dust remover (5) are all communicated with the collection pipeline.

8. The hot blast stove heating type waste gas recyclable spray drying system according to claim 7, wherein the material collection assembly further comprises a circulating fan (6), an air inlet of the circulating fan (6) is communicated with an air outlet of the secondary pulse bag-type dust collector (5), and an air outlet of the circulating fan (6) is communicated with an air inlet of the heat exchange box.

9. Hot blast stove-heated exhaust gas circulatable spray drying system according to claim 2, characterized in that the air inlet of the heat exchange box is provided with a filter (19).

10. The hot blast stove-heated exhaust gas-circulatable spray-drying system according to claim 1, further comprising a feedstock tank (12) and a feed pump (1), wherein the feed pump (1) is in communication between the feedstock tank (12) and the spray-drying tower (2), and wherein the feed pump (1) is capable of feeding the liquid material in the feedstock tank (12) into the spray-drying tower (2).