CN111609709A - Two-stage drying and calcining kiln system and method for nitrate-type molded low-temperature denitration catalyst - Google Patents
Two-stage drying and calcining kiln system and method for nitrate-type molded low-temperature denitration catalyst Download PDFInfo
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- CN111609709A CN111609709A CN202010474619.1A CN202010474619A CN111609709A CN 111609709 A CN111609709 A CN 111609709A CN 202010474619 A CN202010474619 A CN 202010474619A CN 111609709 A CN111609709 A CN 111609709A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/26—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers
- F27B9/262—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers on or in trucks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/003—Handling, e.g. loading or unloading arrangements for articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/009—Alarm systems; Safety sytems, e.g. preventing fire and explosions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/18—Chambers, containers, receptacles of simple construction mainly open, e.g. dish, tray, pan, rack
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
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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
- F27D17/004—Systems for reclaiming waste heat
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
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Abstract
The invention discloses a kiln system and a kiln method for secondary drying and calcining of nitrate-type formed low-temperature denitration catalyst, which comprises a kiln main body, wherein the kiln main body is divided into independent small chambers by heat-insulating partition plates, kiln cars are arranged in the small chambers and are clamped at the sides of tracks by manual pushing; kiln main part upper portion is equipped with hot air supply device and exhaust device, hot air supply device includes first forced draught blower, steam heater, electric heater, circulating fan, communicates in proper order through supply-air duct, exhaust device includes exhaust duct, draught fan and waste heat recovery heat exchanger, draught fan, waste heat recovery heat exchanger pass through exhaust duct and connect, there is heat exchange element in the waste heat recovery heat exchanger, heat exchange element admit air by the second forced draught blower that links to each other with the waste heat recovery heat exchanger provides, has heat transfer pipeline to link to each other between waste heat recovery heat exchanger and the supply-air duct. The distribution of heat and air quantity in the kiln is more uniform, the difference between the indoor upper and lower temperature and the air speed is smaller, the problems that the drying and calcining period of the nitrate molding low-temperature denitration catalyst is long, the catalyst is easy to catch fire, crack and burn and the like are effectively solved, the product quality is improved, and the manual strength and the energy consumption are reduced.
Description
Technical Field
The invention relates to a drying and calcining technology, in particular to a secondary drying and calcining kiln system and a secondary drying and calcining kiln method for a nitrate-type formed low-temperature denitration catalyst.
Background
Along with the economic development and the increase of population year by year, the amount of fossil fuel consumed in China is increased day by year, a large amount of harmful gas such as nitrogen oxide and the like polluting the atmosphere is discharged, acid rain and photochemical smog are easily caused, disasters such as ozone layer cavities are caused, and the disasters such as human health and the survival of animals and plants are greatly threatened. In order to improve the air quality and protect the health of residents, research on a denitration technology for removing nitrogen oxides in industrial waste gas is not slow.
At present, the nitrogen oxide emission control technology comprises two main types of combustion control and flue gas aftertreatment, wherein a selective non-catalytic reduction method (SNCR) and a selective catalytic reduction method (SCR) are the most widely applied flue gas aftertreatment denitration technologies. The SCR technology is classified according to the proper flue gas reaction temperature interval of the catalyst filled in the fixed bed reactor, and generally can be divided into three different SCR technology technologies of high temperature of 450-600 ℃ and above, medium temperature of 320-450 ℃ and low temperature of 120-300 ℃, the development of the medium-high temperature SCR technology is mature, but the technology has the great defect that the flue gas needs to be repeatedly heated to cause waste of a large amount of energy consumption, and the low-temperature SCR technology has the advantages of simple system, large arrangement space, low energy consumption, long service life of the catalyst and low operation cost.
At present, vanadium-based catalysts are generally high in temperature and difficult to reach required activity indexes at the temperature of flue gas below 180 ℃, nitrate catalysts have good low-temperature denitration activity, but the nitrate catalysts mainly have the following problems: the drying temperature of the catalyst blank is 30-80 ℃, the calcining temperature is 80-150 ℃, the temperature requirement is completely different from that of a vanadium-based catalyst, heat is released during segmented drying and calcining to generate a large amount of corrosive waste gas, heat is easy to accumulate in the catalyst, the product is easy to catch fire, the production period of the catalyst is long, the qualification rate is low, the energy consumption of equipment is high, and the like, so that the kiln is required to be provided with a high-precision temperature control system and a good waste gas absorption system, the heat accumulated in the catalyst can be timely taken away, automatic operation is realized, and the production efficiency and the product quality are improved.
The invention patent of Chinese patent document CN102997631A discloses a honeycomb denitration catalyst continuous drying kiln, which is characterized in that a through type drying tunnel kiln main body with an inlet and an outlet is arranged, a kiln car is propelled in the kiln main body through a hydraulic system to realize continuous drying, but the kiln can not accurately control the temperature, the temperature difference in the kiln is large, and the drying process of a nitrate catalyst is difficult to popularize.
The utility model discloses a second grade drying tunnel cave for producing honeycomb formula SCR denitration catalyst is disclosed in chinese patent document CN 203657385U's utility model patent, the draught fan of its characterized in that extraction waste gas, through supply air duct with the heater, the forced draught blower, the hot air supply device that circulating fan linked together, guarantee that this tunnel cave has good hot air heating system and waste gas absorption system, but the waste problem of waste heat in the exhaust duct is not considered to this mode, there is great heat loss, and this tunnel cave internal circulation fan crisscross setting in the both sides of kiln main part, kiln internal air volume and wind speed distribute inhomogeneously, can lead to catalyst idiosome drying progress different and influence product quality.
The utility model discloses a honeycomb formula catalyst drying equipment is disclosed in chinese patent document CN 205940044U's utility model patent, its characterized in that catalyst is separated by the baffle of erectting, and a plurality of air supply assemblies of drying furnace one side fixed mounting, the opposite side are equipped with corresponding air outlet to form good air current environment in the drying kiln, be favorable to the drying and the cooling of catalyst, nevertheless this kiln can not provide the calcination condition of nitrate catalyst, and does not consider the waste problem of waste heat in the exhaust duct.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a secondary drying and calcining kiln for a nitrate-type molded low-temperature denitration catalyst, which has the advantages that the internal heat and air distribution of the kiln is more uniform, the difference between the indoor upper and lower temperature difference and the air speed is smaller, the temperature control is more accurate through two heating modes of steam heating and electric heating, the problems of long drying and calcining period, easy cracking and burning of products and the like of the nitrate-type molded low-temperature denitration catalyst are effectively solved, the product quality is improved, and the labor intensity and the energy consumption are reduced.
The technical scheme is as follows: in order to solve the technical problems, the secondary drying and calcining kiln system and the secondary drying and calcining kiln method for the nitrate-type molded low-temperature denitration catalyst comprise a kiln main body, wherein the kiln main body is divided into independent small chambers by a liftable heat-insulation partition plate, a kiln car is arranged in each small chamber, and the small chambers are clamped on the edge of an overground track through manual pushing; the kiln comprises a kiln body, a kiln body and a kiln cover, wherein the upper part of the kiln body is provided with a hot air supply device and an exhaust device, the hot air supply device comprises a first air feeder, a steam heater, an electric heater and a circulating fan, an outlet of the first air feeder is connected with an inlet of the steam heater through an air supply pipeline, an outlet of the steam heater is connected with an inlet of the electric heater through an air supply pipeline, and an outlet of the electric heater is connected with an inlet of the circulating fan through an air; exhaust device includes exhaust pipe, draught fan and waste heat recovery heat exchanger, exhaust pipe establishes in the one side that deviates from heat supply wind device, runs through kiln main part top and the outer intercommunication of kiln, the draught fan import passes through exhaust pipe with the kiln main part and is connected, the draught fan export passes through exhaust pipe with the waste heat recovery heat exchanger import and is connected, waste heat recovery heat exchanger export passes through exhaust pipe and outdoor intercommunication, there is heat exchange element in the waste heat recovery heat exchanger, and heat exchange element admits air and is provided by the second forced draught blower that links to each other with the waste heat recovery heat exchanger, and it is continuous to have the heat transfer pipeline between waste heat recovery heat exchanger and the supply-.
A two-stage drying and calcining kiln system and a method for a nitrate-type formed low-temperature denitration catalyst are disclosed, wherein the main system flow is as follows:
a secondary drying section:
(1) manually placing a catalyst blank on a kiln car, pushing the catalyst blank into each small chamber of the kiln, and closing a furnace door;
(2) after the first air feeder sends air into the steam heater for heat exchange, the temperature of outlet air is raised to about 100 ℃, the flow of steam is regulated, and hot air flows to the circulating fan;
(3) hot air is blown to the catalyst through a circulating fan and is diffused into the kiln chamber, and the temperature is controlled to be 30-80 ℃;
(4) the waste gas generated in the drying process of the catalyst is extracted by a draught fan, flows into an exhaust pipeline communicated with the kiln body and then flows into a waste heat recovery heat exchanger;
(5) after heat exchange between the waste gas and cold air is carried out in the waste heat recovery heat exchanger, the temperature of the waste gas is reduced to about 25 ℃, and then the waste gas flows into a rear pipeline;
(6) the second air blower sends normal-temperature air into the waste heat recovery heat exchanger, the temperature of the air is raised to 30-65 ℃ after the air exchanges heat with the coming and going waste gas, and the air flows to the air supply pipeline to be mixed with the air extracted by the first air blower;
a calcination section:
(7) after the drying section is finished, the system automatically starts the electric heater, the first air feeder sends air into the electric heater for heat exchange, and then hot air flows to the circulating fan;
(8) hot air is blown to the gaps of the catalyst by a circulating fan and is diffused into a kiln chamber, and the temperature is controlled to be 80-150 ℃;
(9) the waste gas generated in the catalyst calcination process is extracted by a draught fan, flows into an exhaust pipeline communicated with the kiln body and then flows into a waste heat recovery heat exchanger;
(10) after heat exchange is carried out between the waste gas and cold air in the waste heat recovery heat exchanger, the temperature of the waste gas is reduced to 30-50 ℃, and then the waste gas flows into a rear pipeline;
(11) the second air blower sends normal-temperature air into the waste heat recovery heat exchanger, the temperature of the air is raised to 55-130 ℃ after the air exchanges heat with the coming and going waste gas, and the air flows to the air supply pipeline to be mixed with the air extracted by the first air blower.
Preferably, the kiln main part is separated into the independent cell of a plurality of isovolumes by the heat preservation baffle of liftable, and each cell is equipped with independent temperature control system, and cell quantity is 20 ~ 32, and the structure size is: the height is 2m, the depth is 2m, the length is 0.65 m-1.25 m, 3-5 small chambers separated by the kiln main body are in a group, and the heat supply device and the exhaust device are used for supplying heat and extracting waste gas, so that the independent and accurate temperature control of the small chambers of the kiln is ensured, and the energy consumption is greatly saved. Parallel tracks are arranged in the ground of the small chamber, the kiln car is made of metal sections and provided with an interlayer for placing a catalyst, matched wheels are arranged at the bottom of the kiln car, and the kiln car is clamped on the track side through manual pushing.
Preferably, the circulating fans are arranged on one side of the kiln main body in an upper layer and a lower layer, and the circulating fan on the upper layer is suspended indoors through a supporting beam. The arrangement improves the uniformity of the air quantity and the air speed in the kiln chamber, and the hot air penetrates through the catalytic gap for heating, so that the drying and calcining cycle time of the nitrate-type molded low-temperature denitration catalyst is greatly reduced.
Preferably, the first air feeder, the induced draft fan and the second air feeder are connected with the variable frequency controller, and the air feeding and exhausting amount can be adjusted, so that the temperature in the kiln furnace is controlled.
Preferably, the steam heater and the electric heater are connected in series, and a central control system automatically controls according to manually set temperature and time parameters, so that fixed-point timing constant temperature control of a drying section at 30-80 ℃ and fixed-point timing constant temperature control of a calcining section at 80-150 ℃ in the kiln are realized. The internal temperature distribution of each chamber of the kiln is ensured to be more uniform, the temperature difference between the upper part and the lower part of the chamber is smaller, the temperature control is more accurate, and the drying and calcining synchronization rate of catalyst blanks at different positions is improved.
Preferably, each small chamber of the kiln main body is provided with a temperature sensor, and when the temperature in the kiln is detected to be higher than the alarm temperature, an alarm is given out.
Preferably, the waste heat recovery heat exchanger adopts a tube bundle type heat exchanger, waste heat of the exhaust pipeline is transferred to the air supply pipeline for recycling, and energy consumption is saved.
Preferably, the catalyst characteristic parameters are: honeycomb type monolithic catalyst and clover type granular catalyst, the water content of the embryo body is 8-12% before secondary drying. The kiln system can conveniently unify the placing modes of the catalyst, and avoids the problem that the catalyst is placed randomly to cause airflow disorder in the kiln, so that the catalyst is dried and calcined unevenly and cracks and is burnt.
Preferably, the kiln main body is made of a metal material and an insulating layer, and each small chamber of the kiln main body is provided with a furnace door with good sealing performance. The heat preservation effect of the kiln is improved, the kiln is in a closed state during drying and calcining, and the heat loss in the kiln is reduced.
Compared with the prior art, the invention has the following remarkable advantages:
1. the kiln system and the method are suitable for secondary drying and calcining of the nitrate-type formed low-temperature denitration catalyst, a kiln main body is divided into independent small chambers with the same volume by a liftable heat insulation partition plate, each small chamber is provided with an independent temperature control system, 3-5 divided small chambers form a group, a heat supply device and an exhaust device system supply heat and exhaust gas, so that the internal hot air distribution of each chamber of the kiln is more uniform, a calcining system is further provided according to the characteristics of the nitrate-type formed low-temperature denitration catalyst, the drying and calcining integration of the nitrate-type formed low-temperature denitration catalyst is realized, the drying section and the calcining section adopt different heating modes to ensure more accurate temperature control in the kiln, the drying and calcining synchronization rate of catalyst blanks at different positions is improved, the mutual influence among products is avoided, and the quality stability of the products is ensured.
2. The secondary drying and calcining kiln system suitable for the nitrate-shaped low-temperature denitration catalyst fully recovers heat by utilizing the waste heat recovery heat exchanger, saves energy and reduces consumption.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
Wherein: 1. the kiln comprises a kiln body, 2 kiln cars, 3 tracks, 4 heat-preservation partition plates, 5 first blowers, 6 steam heaters, 7 electric heaters, 8 circulating fans, 9 air supply pipelines, 10 discharge pipelines, 11 induced draft fans, 12 waste heat recovery heat exchangers, 13 second blowers, 14 wheels, 15 supporting beams
Detailed Description
The invention will be described in further detail with reference to the following detailed description and accompanying drawings: a kiln system for secondary drying and calcining of nitrate-type molded low-temperature denitration catalyst comprises a kiln main body 1, wherein the kiln main body 1 is divided into independent small chambers by a liftable heat insulation partition plate 4, parallel rails 3 are arranged on the ground of the small chambers, a kiln car 2 is arranged in the small chambers, the kiln car 2 is provided with an interlayer for placing the catalyst up and down, matched wheels 14 are arranged at the bottom, and the kiln car 2 is clamped at the edges of the rails 3 through manual pushing after the catalyst is placed; the kiln comprises a kiln main body 1, and is characterized in that a hot air supply device and an exhaust device are arranged at the upper part of the kiln main body 1, the hot air supply device comprises a first air feeder 5, a steam heater 6, an electric heater 7 and a circulating fan 8, the outlet of the first air feeder 5 is connected with the inlet of the steam heater 6 through an air supply pipeline 9, the outlet of the steam heater 6 is connected with the inlet of the electric heater 7 through the air supply pipeline 9, the outlet of the electric heater 7 is connected with the inlet of the circulating fan 8 through the air supply pipeline 9, the circulating fan 8 is arranged at one side of the kiln main body 1 in an upper layer and a lower layer, and the circulating fan 8; exhaust device includes exhaust pipe 10, draught fan 11 and waste heat recovery heat exchanger 12, exhaust pipe 10 establishes in the one side that deviates from the hot air supply device, runs through 1 top of kiln main part and the outer intercommunication of kiln, draught fan 11 import is connected through exhaust pipe 10 with kiln main part 1, draught fan 11 export passes through exhaust pipe with waste heat recovery heat exchanger 12 import and is connected, waste heat recovery heat exchanger 12 exports through exhaust pipe 10 and outdoor intercommunication, there is heat transfer element in the waste heat recovery heat exchanger 12, and heat transfer element admits air and is provided by the second forced draught blower 13 that links to each other with waste heat recovery heat exchanger 12, has heat transfer pipeline to link to each other between waste heat recovery heat exchanger 12 and the supply air duct 9, first forced draught blower 5, draught fan 11, second forced draught blower 13 all link to each other with frequency conversion controller. Kiln main part 1 comprises metal material and heat preservation, every cell of kiln main part 1 is equipped with the furnace gate that the leakproofness is good, and every cell all is equipped with temperature-sensing ware, can send harsh alarm ring sound to remind the personnel on duty after detecting the kiln internal temperature and being higher than alarm temperature.
A two-stage drying and calcining kiln system for nitrate-type formed low-temperature denitration catalyst comprises the following processes:
a secondary drying section:
1) manually placing a catalyst blank on the kiln car 2, pushing the catalyst blank into each small chamber of the kiln, and closing a furnace door;
2) after the first air feeder 5 sends air into the steam heater 6 for heat exchange, the temperature of outlet air is raised to about 100 ℃, the flow of steam is regulated, and hot air flows to the circulating fan 8;
3) hot air is blown to the catalyst through a circulating fan 8 and is diffused into the kiln chamber, and the temperature is controlled to be 30-80 ℃;
4) the waste gas generated in the drying process of the catalyst is extracted by a draught fan 11, flows into an exhaust pipeline 10 communicated with the kiln body 1 and then flows into a waste heat recovery heat exchanger 12;
5) after heat exchange between the waste gas and cold air is carried out in the waste heat recovery heat exchanger 12, the temperature of the waste gas is reduced to about 25 ℃, and then the waste gas flows into a rear pipeline;
6) the second air blower 13 sends normal temperature air into the waste heat recovery heat exchanger 12, the temperature of the air is raised to 30-65 ℃ after the air exchanges heat with the coming and going waste gas, and the air flows to the air supply pipeline 9 and is mixed with the air extracted by the first air blower 5;
a calcination section:
7) after the drying section is finished, the system automatically starts the electric heater 7, the first air feeder 5 sends air into the electric heater 7 for heat exchange, and then hot air flows to the circulating fan 8;
8) hot air is blown to the gap of the catalyst through a circulating fan 8 and is diffused into the kiln chamber, and the temperature is controlled to be 80-150 ℃;
9) the waste gas generated in the catalyst calcination process is extracted by a draught fan 11, flows into an exhaust pipeline 10 communicated with the kiln body 1, and then flows into a waste heat recovery heat exchanger 12;
10) after heat exchange between the waste gas and cold air is carried out in the waste heat recovery heat exchanger 12, the temperature of the waste gas is reduced to 30-50 ℃, and then the waste gas flows into a rear pipeline;
11) the second blower 13 sends the normal temperature air into the waste heat recovery heat exchanger 12, the temperature of the air after heat exchange with the coming and going waste gas is raised to 55-130 ℃, and the air flows to the air supply pipeline 9 and is mixed with the air extracted by the first blower 5.
In this embodiment, kiln main part 1 is separated into the independent cell of a plurality of isovolumes by liftable heat preservation baffle 4, and each cell is equipped with independent temperature control system, and cell quantity is 24, and the structure size is: the height is 2m, the depth is 2m, the length is 0.95m, 4 small chambers separated by the kiln main body 1 are in a group, and a set of the heat supply device and the exhaust device are used for supplying heat and extracting waste gas. The kiln car 2 is made of metal section bars, the number of the interlayers provided with catalysts placed up and down is 6, the bottom of the interlayer is provided with matched wheels 14, and the interlayer is clamped at the edge of the track 3 through manual propulsion; the steam heater 6 and the electric heater 7 are connected in series, the central control system automatically controls according to manually set temperature and time parameters, the steam heater 6 heats steam with the pressure of 0.8MPa, the temperature of the steam is 170 ℃, the temperature of outlet air is 120 ℃, and fixed-point timing constant temperature control of a drying section at the temperature of 30-80 ℃ in the kiln can be realized by adjusting the steam flow; the electric heater 7 adopts a conventional tubular electric heater, and can realize the fixed-point timing constant-temperature control of the calcination section at 80-150 ℃ in the kiln. The selected waste heat recovery heat exchanger 12 adopts a tube bundle type heat exchanger, and waste heat of the exhaust pipeline 10 can be transferred to the air supply pipeline 9 for recycling. The selected catalyst is a low-temperature honeycomb catalyst formed by manganese, cerium and titanium in nitrates, the moisture content of the blank body is 8% -12% before the blank body is dried for the second time, 18 catalysts with the volume of 3 multiplied by 6 are arranged on a kiln car in each small chamber, and the pore channels of the catalysts are arranged opposite to the opening of the circulating fan.
The above description is only the basic structure, advantages and preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, such as the number of the furnace chamber and the size of the structure, etc. can be adjusted according to the actual situation, and any similar or identical structural changes made according to the technical solution of the present invention are covered by the protection scope of the present invention.
Claims (10)
1. A two-stage drying and calcining kiln system and method for a nitrate-type molded low-temperature denitration catalyst comprises a kiln main body (1), wherein the kiln main body (1) is divided into independent small chambers by a liftable heat-insulation partition plate (4), a kiln car (2) is arranged in each small chamber, and each small chamber is clamped at the edge of an above-ground track (3) through manual pushing; the kiln comprises a kiln body (1), and is characterized in that a hot air supply device and an exhaust device are arranged on the upper part of the kiln body (1), the hot air supply device comprises a first air feeder (5), a steam heater (6), an electric heater (7) and a circulating fan (8), the outlet of the first air feeder (5) is connected with the inlet of the steam heater (6) through an air supply pipeline (9), the outlet of the steam heater (6) is connected with the inlet of the electric heater (7) through the air supply pipeline (9), and the outlet of the electric heater (7) is connected with the inlet of the circulating fan (8) through the air supply pipeline (9); exhaust device includes exhaust pipe way (10), draught fan (11) and waste heat recovery heat exchanger (12), establish in the one side that deviates from the hot air supply device exhaust pipe way (10), run through kiln main part (1) top and the outer intercommunication of kiln, draught fan (11) import is connected through exhaust pipe way (10) with kiln main part (1), draught fan (11) export is imported and is passed through exhaust pipe way with waste heat recovery heat exchanger (12) and is connected, waste heat recovery heat exchanger (12) export is through exhaust pipe way (10) and outdoor intercommunication, there is heat exchange element in waste heat recovery heat exchanger (12), and heat exchange element admits air and is provided by second forced draught blower (13) continuous with waste heat recovery heat exchanger (12), has heat exchange pipeline to link to each other between waste heat recovery heat exchanger (12) and supply air pipeline (9).
2. The kiln system and the method for secondary drying and calcining of the nitrate-based molded low-temperature denitration catalyst according to claim 1 are characterized in that:
a secondary drying section:
1) catalyst blank bodies are manually placed on the kiln car (2), pushed into each small chamber of the kiln, and the furnace door is closed;
2) after the first air feeder (5) sends air into the steam heater (6) for heat exchange, the temperature of outlet air is raised to about 100 ℃, the flow of steam is regulated, and hot air flows to the circulating fan (8);
3) hot air is blown to the catalyst through a circulating fan (8) and is diffused into the kiln chamber, and the temperature is controlled to be 30-80 ℃;
4) waste gas generated in the catalyst drying process is extracted by an induced draft fan (11), flows into an exhaust pipeline (10) communicated with the kiln main body (1), and then flows into a waste heat recovery heat exchanger (12);
5) after heat exchange between the waste gas and cold air is carried out in the waste heat recovery heat exchanger (12), the temperature of the waste gas is reduced to about 25 ℃, and then the waste gas flows into a rear pipeline;
6) the second air blower (13) sends normal-temperature air into the waste heat recovery heat exchanger (12), the temperature of the air is raised to 30-65 ℃ after the air exchanges heat with the waste gas from the coming and going, and the air flows to the air supply pipeline (9) and is mixed with the air extracted by the first air blower (5);
a calcination section:
7) after the drying section reaches 80 ℃, the system automatically starts the electric heater (7) to heat up, and hot air flows to the circulating fan (8);
8) hot air is blown to the gap of the catalyst by a circulating fan (8) and is diffused into the kiln chamber, and the temperature is controlled to be 80-150 ℃;
9) waste gas generated in the catalyst calcination process is extracted by an induced draft fan (11), flows into an exhaust pipeline (10) communicated with the kiln main body (1), and then flows into a waste heat recovery heat exchanger (12);
10) after heat exchange between the waste gas and cold air is carried out in the waste heat recovery heat exchanger (12), the temperature of the waste gas is reduced to 30-50 ℃, and then the waste gas flows into a rear pipeline;
11) the second air blower (13) sends normal temperature air into the waste heat recovery heat exchanger (12), the temperature of the air is raised to 55-130 ℃ after the air exchanges heat with the waste gas flowing from and to, and the air flows to the air supply pipeline (9) to be mixed with the air extracted by the first air blower (5).
3. The kiln system and the method for secondary drying and calcining of the nitrate-type molded low-temperature denitration catalyst according to claim 1, wherein the kiln main body (1) is divided into independent small chambers with the same volume by a liftable heat-insulating partition plate (4), each small chamber is provided with an independent temperature control system, the number of the small chambers is 20-32, and the structural size is as follows: the height is 2m, the depth is 2m, the length is 0.65 m-1.25 m, 3-5 small chambers separated by the kiln main body (1) form a group, and a set of the hot air supply device and the exhaust device system supplies heat and takes out waste gas. Parallel rails (3) are arranged in the ground of the small chamber, the kiln car (2) is made of metal sections and provided with an interlayer for placing a catalyst, matched wheels (14) are arranged at the bottom of the kiln car, and the kiln car is clamped on the edges of the rails (3) through manual pushing.
4. The kiln system and the method for secondary drying and calcining of the nitrate-based molded low-temperature denitration catalyst according to claim 1, wherein the circulating fan (8) is arranged on one side of the kiln body (1) in an upper layer and a lower layer, and the circulating fan (8) on the upper layer is suspended indoors through a support beam (15).
5. The kiln system and the method for secondary drying and calcining of the nitrate-based molded low-temperature denitration catalyst according to claim 1, wherein the first blower (5), the induced draft fan (11) and the second blower (13) are connected with a variable frequency controller, so that the amount of the supplied air and the amount of the discharged air can be adjusted, and the temperature in the kiln can be controlled.
6. The kiln system and the method for secondary drying and calcining of the nitrate-type molded low-temperature denitration catalyst according to claim 1, wherein the steam heater (6) and the electric heater (7) are connected in series, and a central control system automatically controls according to manually set temperature and time parameters, so that the fixed-point timing constant temperature control of a drying section at 30-80 ℃ and the fixed-point timing constant temperature control of a calcining section at 80-150 ℃ in the kiln are realized.
7. The kiln system and the method for secondary drying and calcining of the nitrate-based molded low-temperature denitration catalyst according to claim 1, wherein each chamber of the kiln body (1) is provided with a temperature sensor, and when the temperature in the kiln is detected to be higher than the alarm temperature, an alarm is given.
8. The kiln system and the method for secondary drying and calcining of the nitrate-based molded low-temperature denitration catalyst according to claim 1, wherein the waste heat recovery heat exchanger (12) is a tube bundle heat exchanger, and waste heat of the exhaust duct (10) is transferred to the air supply duct (9) for recycling.
9. The kiln system and the method for secondary drying and calcining of the nitrate-based molded low-temperature denitration catalyst according to claim 1, wherein the characteristic parameters of the catalyst are as follows: honeycomb type monolithic catalyst, clover type granular catalyst, and water content of embryo body before secondary drying is 8-12%.
10. The kiln system and the method for secondary drying and calcining of the nitrate-based molded low-temperature denitration catalyst according to claim 1, wherein the kiln main body (1) is made of a metal material and an insulating layer, and each small chamber of the kiln main body (1) is provided with a furnace door with good sealing performance.
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| CN112791749A (en) * | 2020-12-28 | 2021-05-14 | 山东宇洋汽车尾气净化装置有限公司 | Honeycomb-shaped automobile exhaust purification catalyst roasting furnace |
| CN113145179A (en) * | 2021-04-23 | 2021-07-23 | 苏州西热节能环保技术有限公司 | Plant regeneration roasting activation device for denitration catalyst and regeneration method thereof |
| CN113606890A (en) * | 2021-08-03 | 2021-11-05 | 农业农村部南京农业机械化研究所 | Multilayer fixed drying machine based on hydraulic auxiliary loading and unloading |
| CN114440648A (en) * | 2022-01-14 | 2022-05-06 | 国能龙源催化剂江苏有限公司 | Method for purifying waste gas of denitration catalyst production kiln pipeline |
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