阅读说明：本技术 一种造粒塔全污染强制循环式治理系统 (Granulation tower total pollution forced circulation type treatment system ) 是由 周列 于 2020-12-30 设计创作，主要内容包括：本发明提供一种造粒塔全污染强制循环式治理系统,其包括过滤区A、尿素喷淋成型区B和尿素成品收集区C,过滤区A用于过滤带物料粉末及净化含杂质气体,尿素喷淋成型区B设置在过滤区A下面且用于喷洒尿素液滴,尿素成品收集区C设置尿素喷淋成型区B下面且用于收集凝聚成颗粒状的尿素颗粒；在过滤区A顶部设置有第二百叶窗(13)；在造粒塔的底部侧面设置引风机(8)；在引风机(8)出口处沿造粒塔塔壁切向设置引风管(9)。本发明造粒塔全污染强制循环式治理系统彻底解决了目前干法流程粉尘捕集存在的污染问题,同时降低NH-(3)的排放浓度和总量,满足当下和未来的环保法规要求。(The invention provides a full-pollution forced circulation type treatment system of a prilling tower, which comprises a filtering area A, a urea spraying and forming area B and a urea finished product collecting area C, wherein the filtering area A is used for filtering belt material powder and purifying impurity-containing gas, the urea spraying and forming area B is arranged below the filtering area A and is used for spraying urea liquid drops, and the urea finished product collecting area C is arranged below the urea spraying and forming area B and is used for collecting urea particles condensed into particles; a second shutter (13) is arranged at the top of the filtering area A; a draught fan (8) is arranged on the side surface of the bottom of the prilling tower; an induced draft pipe (9) is arranged at the outlet of the induced draft fan (8) along the tangential direction of the tower wall of the prilling tower. The full-pollution forced circulation type treatment system of the prilling tower thoroughly solves the problem of dust capture in the current dry processCollect the existing pollution problem and simultaneously reduce NH 3 The concentration and the total amount of the emissions meet the current and future environmental regulations.)

1. The utility model provides a granulation tower total pollution forced circulation formula treatment system which characterized in that: the device comprises a filtering area A, a urea spraying and forming area B and a urea finished product collecting area C, wherein the filtering area A is used for filtering material powder and purifying impurity-containing gas, the urea spraying and forming area B is arranged between the filtering area A and the urea finished product collecting area C, is arranged below the filtering area A and is used for spraying urea liquid drops, and the urea finished product collecting area C is arranged below the urea spraying and forming area B and is used for collecting urea particles condensed into particles;

the urea spraying forming area B comprises a tower body (1), a first louver (2), a urea liquid spraying mechanism (3), a spraying mechanism (10) and a material storage disc (11), wherein a filtering area A is arranged at the upper part of the barrel-shaped tower body (1), the first louver (2) is arranged at the upper part of the tower body (1) and the lower part of the filtering area A, the material storage disc (11) is arranged below the first louver (2), and the urea liquid spraying mechanism (3) communicated with the material storage disc (11) sprays hot liquid urea downwards into liquid drops; a spraying mechanism (10) is arranged between the tower body (1) and the first louver (2), and the spraying mechanism (10) sprays fine dilute acid drops according to production requirements;

the filtering area A comprises a filtering component (12) for filtering the material powder, and a second shutter (13) is arranged at the top of the filtering area A; a draught fan (8) is arranged on the side surface of the bottom of the prilling tower; an induced draft pipe (9) is arranged at the outlet of the induced draft fan (8) along the tangential direction of the tower wall of the prilling tower.

2. The prilling tower total pollution forced circulation type treatment system according to claim 1, wherein: the spray head of the spraying mechanism (10) is arranged at the lower part of the first louver (2) and is positioned at the lower end of the spray pipe, and the spray pipe penetrates into the tower through the hole of the annular passage.

3. The prilling tower total pollution forced circulation type treatment system according to claim 2, wherein: the urea finished product collecting region C comprises a material bearing disc (5), a conveying belt (6) and a material scraping machine (7), the material bearing disc (5) receives urea particles which are aggregated into particles, the rotating surface of the material scraping machine (7) is adapted to the material bearing disc (5), and the rotating surface of the material scraping machine (7) pushes the urea particles which are scattered on the material bearing disc (5) to a central leakage hole of the material bearing disc (5); the conveying belt (6) is arranged below the central leak hole of the material bearing disc (5), and urea particles accumulated by the material bearing disc (5) leak onto the conveying belt (6) from the central leak hole and are conveyed to a warehouse for storage through the conveying belt (6); the induced draft fan (8) and the induced draft pipe (9) cooperate to forcibly send the outside air into the tower body of the prilling tower.

4. The prilling tower total pollution forced circulation type treatment system according to claim 3, wherein: a closed clapboard (4) is arranged at the bottom of the granulation tower, so that micro positive pressure is formed in the tower.

5. The prilling tower total pollution forced circulation type treatment system according to claim 4, wherein: the spraying mechanism (10) is connected and designed into an annular structure, and liquid is conveyed through an annular pipeline (14); the spraying mechanisms (10) are connected to different parts of the pipeline (14), and spray pipes of the spraying mechanisms (10) protruding out of the annular pipeline are arranged in groups to form an atomized liquid spraying interface.

6. The prilling tower total pollution forced circulation type treatment system according to claim 3, wherein: and a plurality of induced draft fans are arranged around the bottom of the granulating tower according to the requirements of field production, and spiral ascending air flow is formed by tangential induced draft fans.

7. The prilling tower total pollution forced circulation type treatment system according to claim 3, wherein: according to the air flow speed in the tower body and the control requirement of the urea granulation temperature, the power of the induced draft fan (8) and the induced draft of the second shutter (13) are adjusted online or respectively.

8. The prilling tower total pollution forced circulation type treatment system according to claim 7, wherein: the spray head is provided with a blockage clearing loop device.

9. The prilling tower total pollution forced circulation type treatment system according to claim 7, wherein: an airflow uniform distributor is arranged in the flue mixing path.

10. The prilling tower total pollution forced circulation type treatment system according to claim 7, wherein: the induced draft fan (8) and the second louver (13) are linked with the first louver (2), and the opening and closing degree of the first louver (2) is controlled according to the induced draft volume and the tail gas treatment capacity.

Technical Field

The invention belongs to the technical field of environmental protection, and relates to a full-pollution forced circulation type treatment system for a prilling tower, which can be widely applied to tail gas environmental protection treatment in high tower urea prilling and compound fertilizer prilling processes.

Background

The granulation process for producing urea and compound fertilizer in China mostly adopts a high tower granulation process, and a certain amount of raw material dust and ammonia escape are generated at an exhaust port at the top of a tower body under the influence of climatic conditions, a high tower structure, nozzle abrasion and defects and ammonia carried in a melt in the production process, so that the environmental pollution and the raw material waste are caused. According to statistics, the high-tower urea production devices of various specifications in China are hundreds of sets, and due to large production capacity, the emission of monomer smoke is usually at tens of millions of cubic meters per hour, so that tens of thousands of tons of urea, compound fertilizer powder and ammonia escape, and the environmental quality is seriously influenced.

For example, chinese patent application No. CN202020302703.0 discloses a dust removing device for tail gas of a prilling tower, which relates to a dust removing device for tail gas of a prilling tower. Including casing, bath system, corona electrode, precipitation electrode and ash bucket, the casing top be equipped with the opening and with granulation tower tail gas pipeline intercommunication, the clean air export has been seted up all around to the casing, corona electrode passes through strutting arrangement to be fixed inside the casing, carries out the ionization to dusty air, precipitation electrode corresponds the setting with corona electrode and fixes the inside at the casing, bath system includes water pipe and shower nozzle, the inside at the casing is fixed to the shower nozzle is close to precipitation electrode, water pipe one end is connected to the shower nozzle, and the other end is connected to external water pipeline, the ash bucket is connected bottom the casing, collects the dust.

In recent years, environmental protection improvement aiming at a high tower urea granulation process obtains certain results in continuous operation, the total amount of emissions is reduced, and two main treatment means are dry and wet, but from the current and future environmental protection trends, the current smoke tailing treatment method and device have functional defects to be improved urgently. The main problems are as follows:

environmental protection problem of wet dust removal process

Particularly, under the environment condition that atmospheric diffusion is unfavorable at the temperature of 0-15 ℃, visible trailing smoke exists;

because the dust escaping from the urea and the compound fertilizer is fine and mostly dissolved in water, a certain amount of dust and NH rising along with the hot flue gas and mixed with the liquid water₃Forming aerosol to cause obvious 'tailing' of smoke and no dispersion;

the wet treatment process usually adopts a water spraying process, is limited by a high tower structure (storage, shock resistance and wind resistance) and cannot adopt long-flow spraying, the gas phase, the liquid phase and the solid phase are difficult to obtain good mixing effect, so that the pollutant trapping rate is not high, and the existing test method for wet dust removal has obvious deviation from environmental protection indexes, so that main pollutants obviously do not reach the standard, and the local environmental quality is seriously influenced.

(II) the problem of the existing high tower dry dedusting process is to NH₃The capturing effect of (2) is poor.

The dry dedusting process of high-tower urea mainly adopts high-efficiency filtering principle, although the powder trapping rate in the flue gas is high, the emission concentration can usually reach 5mg/Nm³And below, the dust emission completely meets the requirements; the dry process is not influenced by weather in four seasons, and no visible smoke tail exists; however, the current dry process employs a filtration mechanism for NH₃The capturing effect of (2) is poor.

Disclosure of Invention

Based on the needs of reality and production practice, the applicant develops a granulation tower total pollution forced circulation type treatment system, which is suitable for tail gas environment-friendly treatment of high tower urea granulation and compound fertilizer granulation processes, realizes the environment-friendly aim of integrally solving the tailing of dust, ammonia nitrogen and smoke, and realizes the cyclic utilization of waste water.

According to the technical scheme of the invention, the invention provides a full-pollution forced circulation type treatment system of a prilling tower, which comprises a filtering area A, a urea spraying and forming area B and a urea finished product collecting area C, wherein the filtering area A is used for filtering material powder and purifying impurity-containing gas, the urea spraying and forming area B is arranged between the filtering area A and the urea finished product collecting area C, is arranged below the filtering area A and is used for spraying urea liquid drops, and the urea finished product collecting area C is arranged below the urea spraying and forming area B and is used for collecting urea particles which are aggregated into particles; the urea spraying forming area B comprises a tower body, a first louver, a urea liquid spraying mechanism, a spraying mechanism and a material storage disc, wherein the upper part of the barrel-shaped tower body is provided with a filtering area A, the upper part of the tower body and the lower part of the filtering area A are provided with the first louver, the material storage disc is arranged below the first louver, and the urea liquid spraying mechanism communicated with the material storage disc sprays hot liquid urea downwards into liquid drops; a spraying mechanism is arranged between the tower body and the first louver, and fine dilute acid drops are sprayed by the spraying mechanism according to production requirements; the filtering area A comprises a filtering component for filtering the material powder, and a second shutter is arranged at the top of the filtering area A; a draught fan is arranged on the side face of the bottom of the granulation tower; and an induced draft pipe is arranged at the outlet of the induced draft fan along the tangential direction of the tower wall of the granulation tower.

Furthermore, a spray head of the spraying mechanism is arranged at the lower part of the first louver and is positioned at the lower end of the spray pipe, and the spray pipe penetrates into the tower through the hole of the annular passage.

Preferably, the urea finished product collecting region C further comprises a material bearing disc, a conveying belt and a scraper, wherein the material bearing disc receives urea particles aggregated into particles, a rotating surface of the scraper is matched with the material bearing disc, and the rotating surface of the scraper pushes the urea particles scattered on the material bearing disc to the central leakage hole of the material bearing disc; the conveying belt is arranged below the central leak hole of the material bearing disc, and urea particles accumulated by the material bearing disc leak to the conveying belt from the central leak hole and are conveyed to a warehouse for storage through the conveying belt; the outside air is forcibly sent into the tower body of the prilling tower under the synergistic action of the induced draft fan and the induced draft pipe.

Preferably, a closed clapboard is arranged at the bottom of the prilling tower to maintain the micro-positive pressure formed by the induced draft fan.

More preferably, the spraying mechanism is designed into a ring structure, and liquid is conveyed through the ring pipeline; the spraying mechanism is arranged and connected at different positions of the pipeline, and spraying mechanism spray pipes exposed out of the annular pipeline are arranged in groups to form atomized liquid spraying interfaces.

Preferably, a plurality of induced draft fans are arranged around the bottom of the prilling tower according to the needs of on-site production.

Furthermore, the power of the induced draft fan and the induced draft rate of the second shutter are adjusted online or respectively according to the air flow velocity in the tower body and the control requirement of the urea granulation temperature.

Preferably, the spray head is provided with a clear block loop arrangement. An airflow uniform distributor is arranged in the flue mixing path. The induced draft fan and the second shutter are linked with the first shutter, and the opening and closing degree of the first shutter is controlled according to the induced draft volume and the tail gas treatment capacity.

Compared with the prior art, the granulation tower total-pollution forced circulation type treatment system thoroughly solves the pollution problem existing in dust capture in the current dry process and solves the problem of NH (ammonia) pollution₃Trapping effect ofThe technical problem of poor fruit quality and the reduction of NH₃The emission concentration and the total amount of the catalyst meet the current and future environmental protection regulation requirements, and the following environmental protection indexes are completely up to the standard: no visible smoke trailing, aerosol discharge, dust discharge reaching standard, NH₃The emission reaches the standard.

Drawings

FIG. 1 is a schematic diagram of the tower structure of a prilling tower total pollution forced circulation type treatment system according to the present invention.

Fig. 2 is a schematic cross-sectional view of the spray structure of fig. 1.

The reference numbers in the drawings are as follows: the device comprises a tower body 1, a first louver 2, a urea liquid spraying mechanism 3, a closed partition plate 4, a material bearing disc 5, a conveying belt 6, a scraper 7, a draught fan 8, an induced draft pipe 9, a spraying mechanism 10, a material storage disc 11, a filtering component 12, a second louver 13, a pipeline 14, a filtering area A, a urea spraying forming area B and a urea finished product collecting area C.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the patent of the invention without any inventive work belong to the protection scope of the patent of the invention.

The invention provides a full-pollution forced circulation type treatment system of a prilling tower, which comprises a filtering area A, a urea spraying and forming area B and a urea finished product collecting area C, wherein the filtering area A is used for filtering material powder and purifying impurity-containing gas, the urea spraying and forming area B is arranged below the filtering area A and is used for spraying urea liquid drops, and the urea finished product collecting area C is arranged below the urea spraying and forming area B and is used for collecting urea particles which are condensed into particles.

As shown in figure 1, the tower body structure of the granulation tower total pollution forced circulation type treatment system comprises a filtering area A, a filtering component 12 is arranged at the top of the filtering area A (namely the top of the granulation tower), a second shutter 13 is arranged at the top of the filtering area A, and granulation is carried out under the action of a chimney effectThe tower is internally entrained with material powder and NH₃The discharged gas slowly rises from the bottom of the tower to the top of the tower and is discharged through a second shutter 13 serving as an air outlet. The filter assembly 12 preferably employs a bag-type powder collector, and a blowing mechanism is preferably provided. Preferably, the upper surface of the top of the filtering section a is closed and the lower surface of the top of the filtering section a is provided with a second louver 13. The second louver 13 is arranged, so that rainwater can be prevented from being poured into the prilling tower, the defect that a large-capacity draught fan is used in the prior art is overcome, the weight of tower top equipment can be obviously reduced, vibration generated in the operation of the draught fan is eliminated, and the safety of the prilling tower is improved; meanwhile, the operation equipment on the tower top is reduced, and the workload of system operation inspection and maintenance can be obviously reduced.

The urea spraying forming area B comprises a tower body 1, a first louver 2, a urea liquid spraying mechanism 3, a spraying mechanism 10 and a material storage tray 11, wherein a filtering area A is arranged at the upper part of the tower body 1 which is encircled into a barrel shape, the first louver 2 is arranged at the upper part of the tower body 1 and the lower part of the filtering area A, the material storage tray 11 is arranged below the first louver 2, and the material storage tray 11 is used for containing hot liquid urea; the urea liquid spraying mechanism 3 communicated with the material storage tray 11 sprays the hot liquid urea downwards into fine liquid drops; the liquid drops of the tiny thermal state liquid urea sprayed by the urea liquid spraying mechanism 3 are intersected with cold air from the upstream in the urea spraying forming area B, so that the temperature of the thermal state liquid urea is accelerated to be reduced and urea solid particles are formed.

As shown in fig. 1, the tower structure of the prilling tower total pollution forced circulation type treatment system and as shown in fig. 2 are schematically cross-sectional views of the spraying structure, a spraying mechanism 10 is arranged between the inner side of the tower body 1 and the first louver 2, the spraying mechanism 10 is arranged around the inner side of the tower body and around the first louver 2, preferably at equal intervals, and can also be arranged at the opening of the first louver; the spray mechanism 10 should be positioned to avoid a service bay (a ladder or an operating bay for servicing tower equipment). The spraying mechanism 10 is arranged by adopting a spraying pipe or a spraying head mechanism, and can also be arranged by adopting a remote control, an electric control or a manual control; an automatic valve and PLC control logic are provided for the spraying mechanism 10 to match the spraying volume or spraying time with the detected NH₃The amount or the dust amount is suitable. The spraying mechanism 10 sprays small dilute acid drops according to production needs, preferably atomized liquid, wherein dilute acid (generally carbonated water) which has no corrosive influence on a tower body and equipment is adopted as the atomized liquid, and the carbonated water can pass through CO under certain temperature conditions₂Is pressurized with water, and the carbonated water is volatile at normal pressure, so the water temperature should be controlled at a low level.

The bottom side of the prilling tower is provided with an induced draft fan 8, preferably a high-power induced draft fan or an axial flow induced draft fan, and the bottom of the prilling tower is provided with a sealing clapboard 4 to form micro-positive pressure in the tower. Furthermore, a plurality of induced draft fans can be arranged around the bottom of the granulation tower according to the requirements of field production. Preferably, an induced draft tube 9 is arranged at the outlet of the induced draft fan 8 along the tangential direction of the tower wall of the granulation tower, so that the induced draft direction of the induced draft tube 9 has a bevel angle with the tower wall, and the induced draft direction is not directly opposite to the tower center, namely, the induced draft tube realizes the tangential induced draft to enter the inside of the granulation tower body. Thus, spiral updraft is formed in the tower through the cooperation of a plurality of groups of induced draft fans 8 and induced draft pipes 9.

Under the action of the draught fan 8 and the second shutter 13, the material powder and NH are carried in the prilling tower₃The discharged gas slowly rises to the top of the tower from the bottom of the tower, the ascending gas flow is mixed with the fine dilute carbonic acid drops sprayed by the spraying mechanism 10 in the exhaust flue, and the acid and alkali are neutralized and finally ammonium bicarbonate is formed through the mixing absorption of the fine liquid drops and the discharged gas. Further, a temperature control device can be arranged in the exhaust flue, so that the temperature of the rising hot flue gas is usually lower than 50 ℃; under the action of rising hot flue gas, NH in liquid drops₃The particles are absorbed and converted into dehydrated particles, and are trapped in a subsequent filtering process, so that the tailing phenomenon of the smoke discharged from the outside is eliminated. The spraying means 10 preferably employs a pressure spraying method.

Furthermore, as shown in fig. 1, in the tower body structure of the prilling tower total pollution forced circulation treatment system, the urea finished product collecting region C includes a material receiving tray 5, a conveying belt 6, a scraper 7, an induced draft fan 8 and an induced draft pipe 9, the material receiving tray 5 receives and condenses into solid urea particles, the rotating surface of the scraper 7 is adapted to the material receiving tray, and the scraper 7 pushes the solid urea particles scattered on the material receiving tray 5 to the central leak hole of the material receiving tray 5. The conveyer belt 6 is arranged below the central leak hole of the material bearing disc 5, and the urea particles gathered by the material bearing disc 5 leak to the conveyer belt 6 from the central leak hole and are conveyed to the warehouse for storage through the conveyer belt 6. The induced draft fan 8 and the induced draft pipe 9 cooperate to forcibly send outside air (such as air) into the tower body of the prilling tower. Preferably, the induced draft fan 8 and the second shutter 13 are electrically linked, and the power of the induced draft fan 8 and the air induction amount of the second shutter 13 are adjusted online or respectively according to the air flow velocity in the tower body and the requirement of urea granulation temperature control; furthermore, the induced draft fan 8 and the second louver 13 are linked with the first louver 2, and the opening and closing degree of the first louver 2 is controlled according to the induced draft volume and the tail gas treatment capacity.

Further, a pipe for conveying the additive aqueous substance is provided in the stock tray 11. In the tower body of the full-pollution forced circulation type treatment system of the prilling tower, the object to be captured contains impurities such as material powder, ammonium bicarbonate, dust and the like, the particles containing the impurities such as the material powder, the ammonium bicarbonate, the dust and the like fall into the storage tray 12 through the back washing and back flushing process of the filter assembly 12 or the first louver 2, and a certain amount of process water is conveyed into the storage tray 12 through a pipeline for conveying additive aqueous substances so as to react with the particles containing the impurities. The process water is mainly used for dissolving the material containing the foreign particles and conveying the material. Because of the heat instability of the ammonia water and ammonium bicarbonate, the process water containing the following components added with water can be adopted to form ammonium salt stabilizer under certain temperature conditions for solid ammonia.

In the invention, the temperature of the process water in the material storage tray can be ensured to be at a lower temperature (for example, below 45 ℃), and excessive CO can be injected into the process water in the material storage tray₂To keep the stability of ammonium bicarbonate and the stability of ammonia absorption in the porous powder; when the temperature of the process water in the material storage tray is difficult to ensure at a lower temperature, a proper amount of dilute acid (HCL/H) can be injected into the process water in the material storage tray₂SO₄/H₂PO₃Etc.) for ammonia/ammonium fixation.

Furthermore, the invention adopts a complete set of automatic control measures or technical means, and adopts the following liquid drop atomization and mixing process to eliminate the tail of the flue gas:

1. controlling the concentration and the amount of the atomized liquid:

the atomized liquid is dilute acid liquid without corrosion influence on the tower body and equipment, preferably carbonated water, which can be treated by CO under certain temperature condition₂The carbonated water is more volatile under normal pressure, so that the water temperature is controlled to be lower; the carbonic acid water has low solubility under normal pressure, so the concentration should be controlled below 11%, the total amount of effective carbonic acid gas spraying in the carbonic acid water is sprayed by several times of the mol number of the total ammonia content in the exhaust gas, preferably not less than 2 times.

2. Controlling the forming process and mixing effect of atomized liquid drops:

in the spraying control, the spraying mechanism sprays atomized liquid drops, preferably adopts control modes such as pressurized spraying, gas-liquid two-phase spraying, ultrasonic atomization and the like, so as to realize the control of the forming process and the mixing effect of the atomized liquid drops. In the present invention, the preferred key control points are as follows:

2.1 droplet size: to avoid the dripping phenomenon, the particle size of the air flow ascending channel is usually required to be less than 30 μm;

2.2 the nozzle of the spraying mechanism 10 is usually arranged at the lower part of the shutter of the air inlet, the nozzle of the spraying mechanism 10 is usually arranged at the lower end of a spray pipe, and the spray pipe is usually perforated from an annular walkway and extends into a certain position in the tower;

2.3 as shown in fig. 2, the spraying mechanisms 10 are designed to be connected into an annular structure, liquid is transported through the annular pipeline 14, the spraying mechanisms 10 are connected to different parts of the pipeline 14, and spray pipes of the spraying mechanisms 10 protruding out of the annular pipeline are arranged in groups to form an atomized liquid interface; preferably, the single spray pipes can also form an atomized liquid interface independently or in groups;

2.4 the spray head of the spray pipe is usually provided with a blockage clearing loop device to prevent the spray hole from being blocked, and steam is preferably adopted for clearing;

2.5, a plurality of spray heads are arranged on the path of the smoke ascending channel, so that good atomization and mixing effects are achieved;

2.6 in the flue mixing path of the exhaust flue, an airflow uniform distributor can be arranged.

Compared with a natural circulation ventilation system in the prior art, the granulation tower total-pollution forced circulation type treatment system only uses the induced draft fan arranged at the bottom of the granulation tower, cancels the arrangement of the induced draft fans arranged at other positions, reduces the arrangement quantity of the induced draft fans and reduces the equipment cost. Meanwhile, a louver at the bottom of the prilling tower in the prior art is closed, micro-positive pressure can be formed in the tower by increasing the power of an induced draft fan arranged at the bottom of the prilling tower, and the total power of the induced draft fan is smaller than the sum of the total powers of the induced draft fans of the original prilling tower by utilizing the chimney effect, so that the energy consumption is reduced. The micro-positive pressure formed in the tower is utilized to increase the amount of air substances participating in heat exchange in the tower, and the cooling effect is better. Furthermore, the louver used for sealing the bottom of the prilling tower can obviously reduce the number and the area of the holes on the bottom of the tower, thereby increasing the structural strength of the prilling tower and ensuring better safety.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the embodiments of the present invention disclosed herein should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.