CN112704971B - Granulation tower total pollution treatment system - Google Patents
Granulation tower total pollution treatment system Download PDFInfo
- Publication number
- CN112704971B CN112704971B CN202110330653.6A CN202110330653A CN112704971B CN 112704971 B CN112704971 B CN 112704971B CN 202110330653 A CN202110330653 A CN 202110330653A CN 112704971 B CN112704971 B CN 112704971B
- Authority
- CN
- China
- Prior art keywords
- urea
- spraying
- area
- filtering
- particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/58—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/48—Removing dust other than cleaning filters, e.g. by using collecting trays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/50—Inorganic acids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a granulation tower total pollution treatment system, which comprises a filtering area A, a urea spraying and forming area B, a urea finished product collecting area C and an ammonia elimination and conversion area D, 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, 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 ammonia elimination and conversion area D is arranged between the upper part of the spraying and forming area B and the filtering area A and is used for carrying out conversion reaction on ammonia in tail gas to form ammonium salt particles, and finally the ammonium salt particles are removed from the material powder and purified from the impurity-containing gas through the filtering area A. The granulation tower total pollution treatment system thoroughly solves the pollution problem existing in the dust collection of the current dry process flow, and simultaneously reduces NH3The concentration and the total amount of the emissions meet the current and future environmental regulations.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and relates to a granulation tower total pollution treatment system which can be widely applied to high tower urea granulation and compound fertilizer granulation process tail gas environmental protection treatment.
Background
The granulation process for producing urea and compound fertilizer in China mostly adopts a high tower granulation process, and is influenced by climatic conditions, high tower structure, nozzle abrasion and defects and ammonia carried in melts in the production process, a certain amount of raw material dust and ammonia are generated at an exhaust port at the top of a tower body to escape, so that the environmental pollution is caused and the raw material waste is brought. 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.
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
(1) Particularly, under the environment condition that atmospheric diffusion is unfavorable at the temperature of 0-15 ℃, visible trailing smoke exists;
(2) 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;
(3) 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 gas trapping effect is poor.
Disclosure of Invention
Based on the needs of reality and production practice, the applicant develops a granulation tower total pollution 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 recycling of waste water.
According to the technical scheme of the invention, the invention provides a granulation tower total pollution treatment system which comprises a filtering area A, a urea spraying and forming area B, a urea finished product collecting area C and an ammonia removal conversion area D, 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, 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 ammonia removal conversion area D is arranged between the upper part of the spraying and forming area B and the filtering area A and is used for carrying out conversion reaction on ammonia in tail gas to form ammonium salt particles, and finally the ammonium salt particles are removed through the filtering area A and are used for purifying the impurity-containing gas.
The urea spraying forming area B comprises a tower body 1, a first shutter 2, a urea liquid spraying mechanism 3 and a second shutter 4, a filtering area A is arranged at the upper part of the tower body 1 which is encircled into a barrel shape, the first shutter 2 is arranged at the inner side of the tower body 1 and the lower part of the filtering area A, the urea liquid spraying mechanism 3 sprays hot urea solution downwards into liquid drops, the second shutter 4 is used for leading in air flow, and the first shutter 2 is used for leading out air flow. The urea finished product collecting region C comprises a material bearing disc 5, a conveying belt 6, a scraper 7 and a first induced draft fan 8, wherein the material bearing disc 5 receives urea particles which are aggregated into particles, the rotating surface of the scraper 7 is matched with the material bearing disc, and the scraper 7 pushes the finished product urea which is scattered on the material bearing disc 5 to a central leak hole of the material bearing disc 5. The ammonia elimination conversion area D comprises a spraying mechanism 9 and a pipeline 12, and the spraying mechanism 9 sprays small dilute acid droplets according to the production air volume and the pollutant condition.
Further, the spraying mechanism 9 in the ammonia elimination conversion area D is connected and designed into an annular structure, and liquid is conveyed through an annular pipeline 12; the spraying mechanisms 9 are connected to different parts of the pipeline 12, and the spray pipes of the spraying mechanisms 9 exposed out of the annular pipeline are arranged in rows to form atomized liquid interfaces.
Preferably, the filtering zone a comprises a filtering assembly 11 and a storage tray 10, which is arranged below the filtering assembly 11 and collects the dust collected by the filtering assembly 11. And a second induced draft fan 13 is arranged at the top of the filtering area A. 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 are conveyed to the conveyer belt 6 from the central leak hole to be conveyed to the warehouse for storage. And a first induced draft fan 8 is arranged on the outer side of the second shutter 4, and the outside air is forcibly sent into the tower body. The nozzle of the spraying means 9 is usually mounted at the lower end of a nozzle pipe, which is located below the first louver 2, and which is usually perforated from the ring walkway, going deep into the tower at a certain point.
Furthermore, the pipeline 12 connected with the spraying mechanism 9 is provided with an electromagnetic valve for controlling the flow, frequency and duration of the ammonia spraying. The sprinkler head is usually provided with a clearing circuit arrangement. In the flue mixing path, an airflow uniform distributor can be arranged.
Compared with the prior art, the granulation tower total pollution treatment system thoroughly solves the pollution problem existing in dust capture in the current dry process and solves the problem of NH3The trapping effect is poor, and NH is reduced3The 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:
(1) no visible smoke trailing and aerosol discharge;
(2) the dust emission reaches the standard;
（3）NH3the emission reaches the standard.
Drawings
FIG. 1 is a schematic diagram of the tower body structure of a prilling tower total pollution abatement system according to the present invention.
FIG. 2 is a schematic cross-sectional view of the ammonia elimination conversion zone D.
The reference numbers in the drawings are as follows: the device comprises a tower body 1, a first shutter 2, a urea liquid spraying mechanism 3, a second shutter 4, a material bearing disc 5, a conveying belt 6, a scraper 7, a first induced draft fan 8, a spraying mechanism 9, a material storage disc 10, a filtering component 11, a pipeline 12, a second induced draft fan 13, a filtering area A, a urea spraying forming area B, a urea finished product collecting area C and an ammonia removal conversion area D.
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 granulation tower total pollution treatment system, which comprises a filtering area A, a urea spraying and forming area B, a urea finished product collecting area C and an ammonia elimination and conversion area D, 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, 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 ammonia elimination and conversion area D is arranged between the upper part of the spraying and forming area B and the filtering area A and is used for carrying out conversion reaction on ammonia in tail gas to form ammonium salt particles, and finally the ammonium salt particles are removed from the material powder and purified impurity-containing gas through the filtering area A.
As shown in fig. 1, the tower structure of the total pollution abatement system of the prilling tower, the filtering area a includes a filtering component 11 and a material storage tray 10, a second induced draft fan 13 is arranged at the top of the filtering area a (i.e. the top of the prilling tower), and the prilling tower carries the material powder and NH in the tower under the action of the second induced draft fan 133The vent gas from the bottom of the column slowly rises to the top of the column. The filter assembly 11 preferably employs a bag-type powder collecting device, and is preferably provided with a blowing mechanism. Entrained material powder and NH3The exhaust gas is filtered by the filter assembly 11, and the remaining dust is collected by the material storage tray 10 for recycling.
The urea spraying forming area B comprises a tower body 1, a first louver 2, a urea liquid spraying mechanism 3 and a second louver 4, 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, and cold air entering from the second louver 4 at the bottom of the granulation tower flows upwards from the first louver 2 and enters the filtering area A; the urea liquid spraying mechanism 3 sprays the hot urea solution downwards into fine liquid drops; the tiny hot urea liquid drops 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 hot liquid urea is accelerated to form urea solid particles.
As shown in fig. 1, the tower structure of the prilling tower total pollution abatement system, and as shown in fig. 2, the cross-sectional view of the ammonia elimination conversion area is schematically shown, the ammonia elimination conversion area D is arranged between the upper part of the spray forming area B and the filtering area a, the ammonia elimination conversion area is provided with a spraying mechanism 9 and a pipeline 12, the spraying mechanism 9 is arranged around the first louver at the inner side of the tower body, preferably at equal intervals, or can be arranged at the first louverThe opening of the shutter; the spray units 9 should be arranged to avoid service rooms (service ladders or operating rooms for maintenance of the tower equipment). The spraying mechanism 9 is arranged by adopting a spraying pipe or a spraying head mechanism, and can be arranged by adopting remote control, electric control or manual control; the pipeline 12 connected with the spraying mechanism 9 is provided with a matched electromagnetic valve, and the electromagnetic valve is controlled by receiving data of various sensors and programming operation logic in the PLC, so that the spraying amount or spraying time of the ammonia elimination solution and the detected NH are ensured3The amount, dust amount or ventilation amount are adaptive. The spraying mechanism 9 sprays fine dilute acid drops according to production needs, preferably atomized liquid, wherein the atomized liquid must adopt dilute acid liquid (generally, carbonated water can be adopted) which has no corrosive influence on a tower body and equipment, 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. That is, under the action of the second induced draft fan 13, the material powder and NH are entrained 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 9 in the exhaust flue, and the fine dilute carbonic acid drops and the discharged gas are mixed and absorbed to generate chemical reaction and finally form ammonium bicarbonate. 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 drops3Is absorbed and converted into particles after dehydration, and is trapped in a subsequent filtration process. Therefore, ammonia in the discharged flue gas is captured to form ammonium salt particles, and then the ammonium salt particles are filtered and removed, and aerosol generated by wet dust removal is avoided, so that the trailing phenomenon of the discharged flue gas is eliminated. The spraying means 9 preferably employs a pressure spraying method.
As shown in fig. 1, the tower structure of the prilling tower total pollution abatement system, the urea finished product collecting region C includes a material receiving tray 5, a conveyer belt 6, a scraper 7 and a first induced draft fan 8, the material receiving tray 5 receives and condenses 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 transmitted to the warehouse for storage through the conveyer belt 6. A first induced draft fan 8 is arranged outside the second louver 4, and external air (such as air) is forcibly sent into the tower body. Preferably, the first induced draft fan 8 and the second induced draft fan 13 are electrically linked, and the power and the induced draft of the first induced draft fan 8 and the second induced draft fan 13 are adjusted online or respectively according to the air flow velocity in the tower body and the control requirement of the urea granulation temperature; furthermore, the first induced draft fan 8 and the second induced draft fan 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 air quantity and the tail gas treatment capacity.
Further, a pipe for conveying the additive aqueous substance is provided in the stock tray 10. In the tower body of the granulation tower total pollution treatment system, 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 material storage disc 10 through the reverse washing and back flushing process of the filter assembly 11 or the first louver 2, and a certain amount of process water is conveyed into the material storage disc 10 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 10%, 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 spray head of the spraying mechanism 9 is usually arranged at the lower part of the shutter of the air inlet, the spray head of the spraying mechanism 9 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 9 are designed to be connected into an annular structure, liquid is transported through the annular pipeline 12, the spraying mechanisms 9 are connected to different parts of the pipeline 12, partial spray pipes of the spraying mechanisms 9 exposed out of the annular pipeline can be connected into groups to form atomized liquid interfaces, and single spray pipes can also be independent or a plurality of spray pipes can form atomized liquid interfaces in groups;
2.4 the spray head 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 detecting the ammonia or dust content in the outlet flue gas and the ventilation data through various sensors, calculating the data through a PLC (programmable logic controller) and controlling an electromagnetic valve of the pipeline 12 according to set logic so as to ensure that the chemical reaction of the atomized liquid drops and the outlet flue gas obtains the best effect.
2.7 in the flue mixing path of the exhaust flue, an airflow uniform distributor can be arranged.
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.
Claims (8)
1. The utility model provides a prilling tower total pollution treatment system which characterized in that: the device comprises a filtering area A, a urea spraying and forming area B, a urea finished product collecting area C and an ammonia removal and conversion area D, 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 ammonia elimination conversion area D is arranged between the upper part of the spray forming area B and the filtering area A and is used for carrying out conversion reaction on ammonia in the tail gas to form ammonium salt particles, and finally, the ammonium salt particles are removed through the filtering area A and the impurity-containing gas is purified;
the urea spraying and forming area B comprises a tower body (1), a first shutter (2), a urea liquid spraying mechanism (3) and a second shutter (4), a filtering area A is arranged at the upper part of the barrel-shaped tower body (1), the first shutter (2) is arranged at the upper part of the tower body (1) and the lower part of the filtering area A, a storage disc (10) is arranged below the first shutter (2), and filtered dust is collected; the urea liquid spraying mechanism (3) sprays the hot liquid urea downwards into liquid drops; the ammonia elimination conversion area D is provided with a spraying mechanism (9) and an annular pipeline (12), the spraying mechanism (9) surrounds the first louver on the inner side of the tower body and is arranged between the tower body (1) and the first louver (2), and the spraying mechanism (9) sprays fine dilute acid drops according to production requirements;
a spray head of the spraying mechanism (9) is arranged at the lower part of the first louver (2) and is positioned at the lower end of a spray pipe, and the spray pipe penetrates into the tower through a hole of the annular walkway; the spraying mechanism (9) is connected and designed into an annular structure, and liquid is conveyed through the annular pipeline (12); the spraying mechanisms (9) are arranged and connected at different parts of the annular pipeline (12), and spray pipes of the spraying mechanisms (9) protruding out of the annular pipeline are arranged in groups to form an atomized liquid spraying interface; a matched electromagnetic valve is arranged on the annular pipeline (12) connected with the spraying mechanism (9);
the urea finished product collecting region C comprises a second shutter (4), a material bearing disc (5), a conveying belt (6), a scraper (7) and a first induced draft fan (8), the second shutter (4) is used for introducing airflow, the material bearing disc (5) receives urea particles which are aggregated into particles, the rotating surface of the scraper (7) is adapted to the material bearing disc (5), and the rotating surface of the scraper (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 first induced draft fan (8) and the second induced draft fan (13) are electrically linked, and the power and the induced draft of the first induced draft fan (8) and the second induced draft fan (13) are adjusted online or respectively according to the air flow velocity in the tower body and the requirement of urea granulation temperature control; or the first induced draft fan (8) and the second induced draft fan (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 air volume and the tail gas treatment capacity; the spray head is provided with a blockage clearing loop device, and an airflow uniform distributor is arranged in a flue mixing path;
the atomized liquid is carbonated water, and the carbonated water passes through CO2Pressurizing with water to obtain carbonated water with concentration below 10%, and spraying the total amount of effective carbon dioxide gas in the carbonated water by mol times of the total ammonia content of the discharged gas.
2. The prilling tower total pollution abatement system of claim 1, wherein: the filtering area A comprises a filtering component (11) for filtering the material powder of the belt, and a second induced draft fan (13) is arranged at the top of the filtering area A.
3. The prilling tower total pollution abatement system of claim 2, wherein: the spraying mechanisms (9) are arranged at equal intervals or at the opening of the first louver.
4. The prilling tower total pollution abatement system of claim 3, wherein: the conveying belt (6) is arranged below a central leak hole of the material bearing disc (5), and urea particles accumulated on the material bearing disc (5) leak to the conveying belt (6) from the central leak hole and are conveyed to a warehouse by the conveying belt (6) for storage; and a first induced draft fan (8) is arranged on the outer side of the second shutter (4) and forcibly sends the outside air into the tower body.
5. The prilling tower total pollution abatement system of claim 2, wherein: the spraying mechanism (9) adopts a spraying pipe or a spraying head mechanism, and the spraying mechanism (9) adopts remote control setting or electric control or manual control.
6. The prilling tower total pollution abatement system of claim 1, wherein: the spraying mechanism adopts a pressurized spraying, gas-liquid two-phase spraying or ultrasonic atomization control mode.
7. The prilling tower total pollution abatement system of claim 1, wherein: the particle diameter of the fine diluted acid drops sprayed by the spraying mechanism (9) is less than 30 microns.
8. The prilling tower total pollution abatement system of claim 1, wherein: the blockage clearing loop device adopts steam to clear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110330653.6A CN112704971B (en) | 2021-03-29 | 2021-03-29 | Granulation tower total pollution treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110330653.6A CN112704971B (en) | 2021-03-29 | 2021-03-29 | Granulation tower total pollution treatment system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112704971A CN112704971A (en) | 2021-04-27 |
| CN112704971B true CN112704971B (en) | 2021-07-16 |
Family
ID=75550372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110330653.6A Active CN112704971B (en) | 2021-03-29 | 2021-03-29 | Granulation tower total pollution treatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112704971B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024104350A1 (en) * | 2022-11-17 | 2024-05-23 | 上海境业环保能源科技股份有限公司 | Prilling tail-gas dust ammonia water vapor integrated intelligent purification system, and urea prilling tower |
| CN115779665B (en) * | 2023-01-30 | 2023-05-23 | 上海境业环保能源科技股份有限公司 | Tail gas purifying system of fluidized bed granulator |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4240152C1 (en) * | 1992-11-30 | 1994-06-01 | Schott Glaswerke | Ammonia removal from waste steam from protein treatment - by scrubbing with soln. contg. nitric acid and ammonium nitrate |
| EP2119489A1 (en) * | 2008-05-14 | 2009-11-18 | Uhde Fertilizer Technology B.V. | Method for reducing aerosol emissions in a urea granulation plant |
| ITMI20130847A1 (en) * | 2013-05-24 | 2014-11-25 | Saipem Spa | METHOD AND SYSTEM FOR THE RECOVERY OF AMMONIUM SULPHATE FROM A GASEOUS FLOW OF A UREA PLANT |
| CN204093287U (en) * | 2014-08-29 | 2015-01-14 | 甘肃瓮福化工有限责任公司 | The recycling system of ammonia in tail gas |
| DE102014116719A1 (en) * | 2014-11-14 | 2016-05-19 | Thyssenkrupp Ag | Process for the treatment of sour gas from coking plants and plant for carrying out the process |
| CN107126826A (en) * | 2017-04-10 | 2017-09-05 | 天津凯赛特科技有限公司 | Ammonia-contained tail gas treating device and method in prepared by a kind of soda ash |
| CN206950944U (en) * | 2017-06-13 | 2018-02-02 | 江苏省农业科学院 | Poultry house recirculation air cleaning device |
| CN207722616U (en) * | 2017-12-15 | 2018-08-14 | 陕西驭腾环保科技有限公司 | A kind of ultra-clean zero waste liquid dust arrester installation of discharge desulfurization of flue gas |
| CN208927912U (en) * | 2018-09-30 | 2019-06-04 | 环境保护部南京环境科学研究所 | Recovery type phosphoric acid spraying reaction unit |
| CN110280184A (en) * | 2019-06-04 | 2019-09-27 | 上海境业环保能源科技股份有限公司 | A kind of blowing-suction combined type forced ventilation high-tower granulation device |
| CN110152487A (en) * | 2019-06-26 | 2019-08-23 | 无锡市东方环境工程设计研究所有限公司 | A kind of sintering device flue gas NO_x Reduction by Effective disappears white system |
| CN110465144A (en) * | 2019-08-29 | 2019-11-19 | 上海境业环保能源科技股份有限公司 | A kind of dust pelletizing system of the urea prilling tower of tower top side wall installation blower unit |
| CN110496516A (en) * | 2019-09-24 | 2019-11-26 | 福建龙净环保股份有限公司 | A kind of urea prilling tower removes ammonia system |
| CN110833034B (en) * | 2019-11-29 | 2022-06-17 | 东北农业大学 | Ammonia-removing air purification device in pickling water curtain type pigsty |
| CN211936323U (en) * | 2019-12-27 | 2020-11-17 | 厦门华厦学院 | Ammonia gas treatment device |
| CN212091624U (en) * | 2019-12-30 | 2020-12-08 | 四川拓日新能环保科技有限公司 | Ammonia waste gas treatment device |
| CN112076608B (en) * | 2020-08-05 | 2022-08-12 | 清华大学无锡应用技术研究院 | Gallium nitride production furnace waste ammonia recovery unit |
-
2021
- 2021-03-29 CN CN202110330653.6A patent/CN112704971B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112704971A (en) | 2021-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112704971B (en) | Granulation tower total pollution treatment system | |
| CN103316553A (en) | Efficient wet-type variable flow fog-spraying sprinkling dust-removing purification device | |
| CN101708420A (en) | Treatment technique for pollutants in sinter fume and spraying and absorbing tower thereof | |
| CN105668832B (en) | A kind of desulfurization wastewater treatment system and method | |
| AU2017262812A1 (en) | Submicron particle removal from gas streams | |
| CN205832956U (en) | A kind of coke oven low-sulfur tail gas wet method desulfurization reduces soluble dust exhaust system | |
| CN207786313U (en) | Smoke multistage high-effective dust-removing demister | |
| CN204996310U (en) | Coke oven flue gas SOx/NOx control unites purifier | |
| CN104998504B (en) | A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art | |
| CN104190190A (en) | Dedusting and desulfurization integrated machine | |
| CN202191835U (en) | Granite spraying desulphurization equipment | |
| CN206295748U (en) | Desulfurization and dedusting demisting minimum discharge device | |
| CN201216921Y (en) | Novel controllable wet desulphurization column for smoke prevention and dust control | |
| CN201537454U (en) | Desulphurization tower for desulphurization through ammonia process | |
| CN105056671B (en) | A kind of wet desulphurization tower desulfurization and dedusting demisting water saving art and its device | |
| CN113546576A (en) | Granulation tower total pollution forced circulation type treatment system | |
| CN211435768U (en) | Flue gas treatment device for semi-dry desulfurization and low-temperature SCR denitration of carbide slag | |
| CN108744941A (en) | A kind of the spray column desulphurization system and method for high-order arrangement | |
| CN202161916U (en) | Flue gas desulfurization spraying equipment | |
| CN214261785U (en) | Granulation tower total pollution forced circulation type treatment system | |
| CN209378486U (en) | A kind of device for eliminating condensable particulate matter | |
| CN105771578A (en) | Integration technology for raw material processing and smoke desulfurizing | |
| CN210473568U (en) | Equipment for separating nitrogen oxide by spraying fluidization | |
| CN201088898Y (en) | Annular space washing device | |
| CN209271164U (en) | Column for smoke purification |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |