CN110841477A - Escaping ammonia treatment device and method for tunnel kiln for calcining denitration catalyst - Google Patents
Escaping ammonia treatment device and method for tunnel kiln for calcining denitration catalyst Download PDFInfo
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- CN110841477A CN110841477A CN201911295747.3A CN201911295747A CN110841477A CN 110841477 A CN110841477 A CN 110841477A CN 201911295747 A CN201911295747 A CN 201911295747A CN 110841477 A CN110841477 A CN 110841477A
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- waste gas
- tunnel kiln
- ammonia
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- calcining
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- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8634—Ammonia
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- 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
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- 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
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- 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
- B01D53/86—Catalytic processes
- B01D53/869—Multiple step processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/10—Nitrogen
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- 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
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- 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
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
The invention relates to the technical field of tunnel kiln waste gas treatment, in particular to an escaping ammonia treatment device and method for a tunnel kiln for calcining a denitration catalyst. The invention comprises a tunnel kiln main body, a waste gas collecting pipeline arranged in the tunnel kiln main body and a waste gas reactor connected to the waste gas collecting pipeline; a discharge fan is also arranged on the connecting pipeline of the waste gas reactor and the waste gas collecting pipeline; the waste gas reactor is internally provided with a dust removal filter cloth layer, a back flushing device and a multi-stage ammonia removal filter cloth layer in sequence from an inlet to an outlet. The invention directly utilizes the waste gas collecting pipeline in the tunnel kiln to intensively convey the waste gas to the waste gas reactor, and the filter cloth in the dedusting filter cloth layer is used for respectively treating dust particles and escaping ammonia.
Description
Technical Field
The invention relates to the technical field of tunnel kiln waste gas treatment, in particular to an escaping ammonia treatment device and method for a tunnel kiln for calcining a denitration catalyst.
Background
NH3Is a colorless, flammable and typical industrial gaseous pollutant with pungent and foul smell, and the emission of the pollutant seriously threatens the ecological environment. The water-soluble organic fertilizer reacts with sulfuric acid, nitric acid and the like in the atmosphere to generate ammonium sulfate salt or ammonium nitrate salt, the ammonium sulfate salt or the ammonium nitrate salt is deposited to cause acidification of soil and surface water and eutrophication of water body, and meanwhile, the nitrogen balance in an ecological system is also seriously disturbed. Second, NH3Is also one of the main pollutants involved in the formation of aerosols, generating solid Particles (PM) with an aerodynamic diameter of less than 2.5 μm2.5) After entering the pulmonary alveoli, the ventilation capacity of the lungs is directly affected, which leads to the body being easily in an anoxic state. In addition, partial diffusion into the atmospheric cloud results in changes in cloud chemistry and ozone layer oxidation rates. When the content is more than the lowest concentration (5.3ppm) which can be sensed by human body, discomfort is caused to human body, and when the content exceeds 76mg/m3Can stimulate human mucosa to reach 300mg/m3Can seriously damage the mucosal surface of the human body. Excess NH is inhaled3Thereafter, its rancidity and involvement in the reflex action of the trigeminal nerve endings can lead to cardiac arrest or cessation of breathing, endangering life safety. A large amount of the medicine is absorbed in a short time, symptoms such as lacrimation, chest distress, pharyngalgia, blood phlegm, dyspnea and the like can be caused, and complications such as pulmonary edema, respiratory distress syndrome and the like can be caused seriously. Long term exposure to NH3Can cause the symptoms of finger feed rot or skin pigmentation and the like of some people. Therefore, for containing NH3The treatment of waste gas has important social significance.
The honeycomb denitration catalyst can release a large amount of ammonia gas in the calcination process of the tunnel kiln due to ammonia water volatilization and metavanadate in the formula of the catalystThe decomposition of ammonium, ammonium metatungstate and ethanolamine produces waste ammonia gas, which is also mixed with H produced during the catalyst calcination process2O、SO3The reaction is carried out to generate ammonium sulfate and ammonium bisulfate particles. The conventional treatment measure of the tunnel kiln for calcining the catalyst at present is to remove dust from the waste gas by flue gas, absorb the tail gas by a tower and directly vent the waste gas by a chimney.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an escaped ammonia treatment device and method for a tunnel kiln, which can ensure that escaped ammonia in the tunnel kiln is discharged zero and effectively remove waste ammonia gas and dust particles generated in the catalyst calcination process.
The invention is realized by the following technical scheme:
an escaping ammonia treatment device of a tunnel kiln for calcining a denitration catalyst comprises a tunnel kiln main body, a waste gas collecting pipeline arranged in the tunnel kiln main body, and a waste gas reactor connected to the waste gas collecting pipeline; a discharge fan is also arranged on the connecting pipeline of the waste gas reactor and the waste gas collecting pipeline; the waste gas reactor is internally provided with a dust removal filter cloth layer, a back flushing device and a multi-stage ammonia removal filter cloth layer in sequence from an inlet to an outlet.
Furthermore, an inlet pipeline of the waste gas reactor is provided with an inlet measuring point, and an outlet pipeline is provided with an outlet measuring point.
Furthermore, the bottom of the waste gas reactor is also provided with a slag discharge port, and the slag discharge port is arranged on the dust removal side of the dust removal filter cloth layer.
Furthermore, the waste gas collecting pipeline is respectively provided with a collecting branch pipe corresponding to each heating unit of the tunnel kiln.
Further, the filter cloth of the dedusting filter cloth layer is made of P84, PTFE or PPS.
Furthermore, the number of layers of the multistage ammonia removal filter cloth layers is 1-4, the thickness of each layer is 3-20 mm, and an ammonia removal catalyst is attached to the filter cloth substrate.
An escape ammonia treatment method of a tunnel kiln for calcining a denitration catalyst comprises the following steps,
step 1, forming negative pressure inside a tunnel kiln by a discharge fan through a waste gas collecting pipeline, collecting waste gas discharged from the inside of the tunnel kiln, and conveying the collected waste gas to a waste gas reactor;
firstly, removing dust, dust and salt particles in the waste gas through a dust removal filter cloth layer;
secondly, removing ammonia gas in the waste gas through the catalysis of a multi-stage ammonia removal filter cloth layer;
and finally, discharging the waste gas from which the dust particles and the ammonia gas are removed out of the waste gas reactor for emptying or recycling.
Further, in the step 1, the temperature range of the waste gas is controlled to be 80-260 ℃ by controlling the position of the exhaust fan.
Further, the method also comprises the step of periodically blowing and cleaning the dust removal filter cloth layer by arranging a back blowing device.
Furthermore, in the step 2, the concentration of ammonia gas is measured on an inlet pipeline of the waste gas reactor through an inlet measuring point, the power of an exhaust fan is adjusted, and the wind speed is controlled to be 0.5m/s-5 m/s.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the escaping ammonia treatment device for the tunnel kiln for calcining the denitration catalyst, disclosed by the invention, waste gas is intensively conveyed to the waste gas reactor by directly utilizing the waste gas collecting pipeline in the tunnel kiln, and dust particles and escaping ammonia are respectively treated by the filter cloth in the dedusting filter cloth layer, so that the device is reasonable in design, economical and small in occupied area; because the dust removal filter cloth layer has good entrapment effect to the dust granule, multistage ammonia filter cloth layer that removes has the action of adsorbing and catalytic desorption to the howls of ammonia, and the waste gas that tunnel kiln produced can carry out the efficient deamination edulcoration to tunnel kiln waste gas after waste gas reactor handles, makes tunnel kiln waste gas obtain effectual purification, greatly reduced tunnel kiln waste gas to the pollution of air.
Preferably, the device of the invention adopts the mode that the inlet measuring point and the outlet measuring point are respectively arranged at the inlet pipeline and the outlet pipeline of the waste gas reactor, so that the ammonia concentration can be effectively measured in time according to the requirement.
Preferably, the device provided by the invention can collect and discharge dust particles or dust intercepted by the dedusting filter cloth layer in a centralized manner by arranging the slag discharge port at the bottom of the waste gas reactor, so that the treatment effect of the waste gas reactor is ensured.
Preferably, the device provided by the invention can realize comprehensive collection of waste gas in the tunnel kiln and improve the collection rate by respectively arranging the waste gas collection pipelines with the collection branch pipes corresponding to each heating unit of the tunnel kiln, thereby ensuring the final treatment effect.
The invention relates to a method for treating escaped ammonia in a tunnel kiln for calcining a denitration catalyst, which is characterized in that tunnel kiln waste gas is collected and then subjected to dust removal and deamination through a waste gas reactor, so that the waste gas can be effectively purified, water or chemical reagents and other media are not needed in the waste gas impurity removal process, escaped ammonia and oxygen in the waste gas are subjected to catalytic oxidation reaction under the action of a catalyst in a multi-stage ammonia removal filter cloth layer to obtain nitrogen and water, the ammonia impurity removal process is simple and convenient to operate, the dust removal effect is good, the deamination efficiency is high, the ammonia escaped treatment capacity of the tunnel kiln waste gas reaches over 90 percent, and the purified waste gas can be emptied or introduced into a denitration catalyst drying chamber for secondary utilization according to actual.
Preferably, the dust removal filter cloth layer is periodically swept by a back-blowing device so as to achieve the effect of reducing the gas resistance of the dust removal filter cloth layer, ensure the trapping capacity of the dust removal filter cloth layer and improve the dust removal effect.
Drawings
FIG. 1 is a schematic diagram of the structural arrangement of the device according to the embodiment of the present invention.
In the figure: 1 is a honeycomb denitration catalyst, 2 is a tunnel kiln main body, 3 is a temperature control unit, 4 waste gas collecting pipelines, 5 waste gas exhaust fans, 6 slag outlets, 7 waste gas reactors, 8 dust removal filter cloth layers, 9 back blowing devices, 10 multi-stage ammonia removal filter cloth layers, 11 inlet measuring points and 12 outlet measuring points.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Example 1
As shown in fig. 1, the escaping ammonia treatment device of the tunnel kiln for calcining the denitration catalyst comprises a waste gas collecting pipeline 4, a discharge fan 5 and a waste gas reactor 7; the waste gas collecting pipeline 4 is positioned in the tunnel kiln main body 2, waste gas is conveyed to a waste gas reactor 7 through a discharge fan 5, escaping ammonia and dust particles in the waste gas are removed, and then the waste gas is emptied or recycled; the waste gas reactor 7 contains dust removal filter cloth layer 8, blowback device 9, multistage ammonia removal filter cloth layer 10 in the interior, dust removal filter cloth layer 8 is arranged in detaching dust and salt granule in the waste gas, blowback device 9 regularly sweeps the dust removal filter cloth layer in order to reach the effect that reduces its gas resistance, multistage ammonia removal filter cloth layer 10 is arranged in the ammonia of catalytic elimination waste gas.
The material of the filter cloth in the dedusting filter cloth layer 8 can be P84, PTFE or PPS.
Wherein, the multistage ammonia removal filter cloth layer 10 can be 1-4 layers, and the thickness of each layer is 3-20 mm.
Wherein, discharge fan 5 chooses the frequency conversion fan for use, adjusts power size through the converter.
Example 2
An escape ammonia treatment method of a tunnel kiln for calcining a denitration catalyst comprises the following steps,
step 1, a discharge fan 5 forms negative pressure in a tunnel kiln through a waste gas collecting pipeline 4, collects waste gas discharged from the interior of the tunnel kiln, and conveys the collected waste gas to a waste gas reactor 7;
firstly, removing dust, dust and salt particles in the waste gas through a dust removal filter cloth layer 8;
secondly, removing ammonia gas in the waste gas through the catalysis of a multi-stage ammonia removal filter cloth layer 10;
finally, the exhaust gas from which the dust particles and ammonia gas are removed is discharged out of the exhaust gas reactor 7 for exhaustion or reuse.
Wherein, discharge fan 5 chooses the frequency conversion fan for use, adjusts power size through the converter. An inlet measuring point 11 is also arranged on a pipeline connecting the exhaust fan 5 and the waste gas reactor 7, the power of the exhaust fan 5 can be adjusted through the measurement of the ammonia gas concentration at the inlet measuring point 11, and the wind speed is controlled to be 0.5m/s-5 m/s. (ii) a An outlet point 12 is also arranged on the outlet pipeline of the exhaust gas reactor 7, and the concentration of escaping ammonia can be monitored through the outlet point 12.
Wherein the temperature range of the waste gas is controlled between 80 ℃ and 260 ℃ by controlling the position of the exhaust fan 5. Because the temperature distribution of the denitration catalyst tunnel kiln is in a step-type increase along with the increase of the length of the belt, the temperature of the flue gas discharged from the position closer to the outlet of the tunnel kiln is higher, and the highest temperature can reach 650 ℃. The exhaust fan 5 is arranged at a position close to the inlet by controlling the position of the exhaust fan 5 arranged on the waste gas collecting pipeline 4, so that the working temperature of the deamination filter bag can be ensured to be between 80 ℃ and 260 ℃.
In this embodiment, a large amount of ammonia that releases when calcining honeycomb denitration catalyst 1 in the tunnel kiln passes through exhaust gas reactor 7 after collecting, can obtain effectual purification, and waste gas edulcoration process need not be with the help of media such as water or chemical reagent, escape ammonia and oxygen in the waste gas obtain nitrogen and water through catalytic oxidation under the ammonia removal catalyst effect in multistage ammonia removal filter cloth layer 10, deamination edulcoration technology is easy and simple to handle, and the dust removal effect is good, deamination efficiency is high, tunnel kiln waste gas ammonia escapes more than 90%, the waste gas after the purification is evacuation or reentrant denitration catalyst drying chamber and is carried out the reutilization according to actual conditions.
Wherein, the filter cloth fiber of the multistage ammonia removal filter cloth layer 10 contains an ammonia removal catalyst, for example, the active component is one or more of copper oxide, manganese oxide, cobalt oxide, cerium oxide, copper sulfate and vanadium pentoxide, and the carrier is anatase titaniumOre type nano TiO2Or nano α -Al2O3。
The above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the scope of the present invention, so that equivalent changes or modifications made based on the structures, features and principles described in the claims of the present invention should be included in the claims of the present invention.
Claims (10)
1. An escaping ammonia treatment device of a tunnel kiln for calcining a denitration catalyst is characterized by comprising a tunnel kiln main body (2), an exhaust gas collecting pipeline (4) arranged in the tunnel kiln main body (2), and an exhaust gas reactor (7) connected to the exhaust gas collecting pipeline (4); a discharge fan (5) is also arranged on the connecting pipeline of the waste gas reactor (7) and the waste gas collecting pipeline (4); the waste gas reactor (7) is internally provided with a dust removal filter cloth layer (8), a back flushing device (9) and a multi-stage ammonia removal filter cloth layer (10) in sequence from an inlet to an outlet.
2. The escaped ammonia treatment apparatus of a tunnel kiln for calcining a denitration catalyst according to claim 1, wherein an inlet point (1) (1) is provided at an inlet pipe of the exhaust gas reactor (7), and an outlet point (12) is provided at an outlet pipe.
3. The escaped ammonia treatment device of a tunnel kiln for calcining a denitration catalyst according to claim 1, wherein a deslagging port (6) is further provided at the bottom of the exhaust gas reactor (7), and the deslagging port (6) is provided at the dust removal side of the dust removal filter cloth layer (8).
4. The escaped ammonia treatment apparatus for a tunnel kiln through which a denitration catalyst is calcined according to claim 1, wherein the exhaust gas collecting duct (4) is provided with a collecting branch pipe corresponding to each heating unit of the tunnel kiln, respectively.
5. The escaped ammonia treatment apparatus of a tunnel kiln for calcining a denitration catalyst according to claim 1, wherein the filter cloth of the dust-removing filter cloth layer (8) is made of P84, PTFE or PPS.
6. The escaped ammonia treatment device of a tunnel kiln for calcining a denitration catalyst as claimed in claim 1, wherein the number of the multistage ammonia removal filter cloth layers (10) is 1 to 4, the thickness of each layer is 3mm to 20mm, and the ammonia removal catalyst is attached to the filter cloth substrate.
7. A method for treating escaped ammonia in a tunnel kiln for calcining a denitration catalyst, which is based on the apparatus according to any one of claims 1 to 6, comprising the steps of,
step 1, a discharge fan (5) forms negative pressure inside a tunnel kiln through a waste gas collecting pipeline (4), collects waste gas discharged from the inside of the tunnel kiln, and conveys the collected waste gas to a waste gas reactor (7);
step 2, the waste gas entering the waste gas reactor (7),
firstly, removing dust, dust and salt particles in the waste gas through a dust removal filter cloth layer (8);
secondly, the ammonia gas in the waste gas is catalytically eliminated through a multi-stage ammonia removal filter cloth layer (10);
and finally, the waste gas from which the dust particles and the ammonia gas are removed is discharged out of the waste gas reactor (7) for emptying or recycling.
8. The method for treating escaped ammonia in a tunnel kiln for calcining a denitration catalyst as claimed in claim 7, wherein in the step 1, the temperature of the exhaust gas is controlled to be in the range of 80 ℃ to 260 ℃ by controlling the position of the exhaust fan (5).
9. The method for treating escaped ammonia in a tunnel kiln for calcining a denitration catalyst as claimed in claim 7, further comprising the step of periodically purging and cleaning the dedusting filter cloth layer (8) by providing a blowback device (9).
10. The escaped ammonia treatment method of a tunnel kiln for calcining a denitration catalyst according to claim 7, wherein in the step 2, the concentration of ammonia gas is measured by arranging an inlet measuring point (11) on the inlet pipeline of the exhaust gas reactor (7), and the power of the exhaust fan (5) is adjusted to control the wind speed to 0.5m/s-5 m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911295747.3A CN110841477A (en) | 2019-12-16 | 2019-12-16 | Escaping ammonia treatment device and method for tunnel kiln for calcining denitration catalyst |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911295747.3A CN110841477A (en) | 2019-12-16 | 2019-12-16 | Escaping ammonia treatment device and method for tunnel kiln for calcining denitration catalyst |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112610963A (en) * | 2020-11-27 | 2021-04-06 | 珠海格力智能装备有限公司 | Two ware degreases of air conditioner and VOCs waste gas treatment equipment |
| CN113731113A (en) * | 2021-09-15 | 2021-12-03 | 北京工大环能科技有限公司 | System for reducing blockage of ammonium bisulfate of air preheater of coal-fired power plant |
-
2019
- 2019-12-16 CN CN201911295747.3A patent/CN110841477A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112610963A (en) * | 2020-11-27 | 2021-04-06 | 珠海格力智能装备有限公司 | Two ware degreases of air conditioner and VOCs waste gas treatment equipment |
| CN113731113A (en) * | 2021-09-15 | 2021-12-03 | 北京工大环能科技有限公司 | System for reducing blockage of ammonium bisulfate of air preheater of coal-fired power plant |
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