CN212942235U - Tunnel cave flue gas desulfurization dust removal deNOx systems - Google Patents
Tunnel cave flue gas desulfurization dust removal deNOx systems Download PDFInfo
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- CN212942235U CN212942235U CN202021147171.4U CN202021147171U CN212942235U CN 212942235 U CN212942235 U CN 212942235U CN 202021147171 U CN202021147171 U CN 202021147171U CN 212942235 U CN212942235 U CN 212942235U
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Abstract
The utility model belongs to the technical field of flue gas environmental protection treatment, and discloses a tunnel kiln flue gas desulfurization, dust removal and denitration system, which is provided with a desulfurization system for desulfurizing the flue gas of a tunnel kiln; the bag-type dust collector system is communicated with the desulfurization system and is used for removing dust; the urea pyrolysis system is connected with the bag-type dust collector system and is used for heating the flue gas and completely pyrolyzing the urea solution to generate ammonia gas so as to ensure that the appropriate reaction temperature range of the denitration catalyst is reached; the heating system is used for regenerating the catalyst and ensuring that the catalyst has a stable denitration effect in the chemical life; and the denitration system is communicated with the urea pyrolysis system and is used for treating the nitrogen oxides. By adopting the low-temperature SCR technology and using the flue gas of the tunnel kiln as a heat source for preparing ammonia by urea pyrolysis, the heat source in the urea pyrolysis process is saved, the direct pyrolysis of urea solution in a high-temperature pyrolysis furnace is realized, the fan directly leads to the denitration reactor, and the efficient denitration efficiency is realized by matching the low-temperature SCR reactor and the catalyst.
Description
Technical Field
The utility model belongs to the technical field of the flue gas environmental protection is administered, especially, relate to a tunnel kiln flue gas desulfurization dust removal deNOx systems.
Background
At present, with the concern of the country on the air quality, relatively strict pollutant emission limits are put forward for the fire-resistant industry, particularly for regions with limited environmental capacity, and relevant requirements are put forward for the fire-resistant material industry, and smoke dust and SO are generated in some regions under the condition that the reference oxygen content is 18%2、NOxThe discharge concentration is not higher than 10mg/m3、35mg/m3、50mg/m3。
The refractory industry mainly uses a tunnel kiln, the general temperature of flue gas is low, and the problem that how to solve the low-temperature flue gas treatment of the tunnel kiln is currently the key problem of the industry is solved. At present, the tunnel kiln smoke treatment scheme is good and uneven, white smoke is generated after operation of many enterprises, the material consumption is high, the cost is high, the service life of equipment is short, solid wastes cannot be treated, the smoke treatment effect is poor, ammonia escape is high, operation is complicated and the like. Therefore, the optimal scheme for treating the flue gas of the tunnel kiln is the subject of research and development of various environmental protection companies.
The traditional process routes for treating the flue gas of the tunnel kiln are roughly two types:
1. the denitration part of the process has high requirement (over 330 ℃) on the temperature of a flue gas inlet, most of tunnel kiln exhaust gas temperature cannot reach the temperature range, a hot blast stove is required to be additionally arranged, the operation cost is high, the other part of tunnel kiln exhaust gas contains heavy oil, the catalyst is possibly blocked or poisoned, and the instability is high.
2. The high-temperature denitration system is provided with a waste heat boiler, electric dust removal and ammonia desulphurization, the temperature of partial smoke can be reduced by recycling heat of the waste heat boiler, the whole operation cost is still higher, the occupied area is larger, the construction cost is higher, the smoke discharged from a chimney is generated by 'white smoke', the ammonia escape is higher, the equipment corrosion is serious, and the haze can be aggravated if aerosol is easily generated by treating the consumption of bad ammonia water.
Through the above analysis, the problems and defects existing in the prior art are summarized as follows:
firstly, the tunnel kiln smoke treatment scheme is not uniform, and a plurality of enterprises have a series of problems of white smoke, high material consumption, high cost, short service life of equipment, poor smoke treatment effect, high ammonia escape, complex operation and the like after operation.
Secondly, with the increasing strictness of environmental protection standards, the pollutant discharge amount of the fire-resistant industry cannot meet the environmental protection requirement;
thirdly, the temperature of the exhaust gas of the tunnel kiln is low, and the generated NOxThe method has the advantages that the method is high, the conventional SCR and SNCR technologies cannot reach the standard, the adopted denitration process is required to be high in efficiency, and the exhaust gas temperature of the tunnel kiln is required to be increased;
fourthly, the operation cost is reduced, the generation amount of solid waste is reduced, and white smoke plume is eliminated.
Fifthly, the flue gas exhaust temperature is generally 150-240 ℃, compared with the common denitration reaction temperature range of 280-400 ℃, the high-temperature denitration reaction is not facilitated.
The difficulty in solving the above problems and defects is:
1. the fluctuation of the exhaust gas temperature is large, and generally fluctuates at 150-240 ℃, so that the high-temperature denitration reaction cannot be smoothly carried out.
2. The smoke components are more complex than those of a power plant, and the smoke components contain oil substances, so that the blockage of a dust remover and the poisoning of a catalyst are easily caused.
3. If wet desulphurization is adopted, white smoke is generated, the generation of the white smoke in the smoke discharged from the tunnel kiln is not allowed according to the relevant environmental protection requirements at present, waste water is generated, and a new treatment problem is increased.
4. If high-temperature denitration is adopted, temperature rise is needed, energy consumption is large, and how to reduce the operation cost is a key.
5. Generally, the flue gas treatment project of the tunnel kiln is a reconstruction project, the field space is small, and the problem of how to reduce the occupied area and save the land for enterprises is solved.
The significance of solving the problems and the defects is as follows:
1. can solve the problem that the desulfurization, denitrification and dedusting of the flue gas are stably carried out under the low-temperature condition.
2. Can solve the influence of oil substances on the dust remover and the catalyst.
3. Can solve the problem of white smoke and the problem of waste water generation.
4. The problem of high energy consumption can be solved, and the operating cost is reduced.
5. The floor space can be reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model provides a tunnel kiln flue gas desulfurization, dust removal and denitration system.
The utility model is realized in such a way that the tunnel kiln flue gas desulfurization, dust removal and denitration system is provided with a desulfurization system for desulfurizing the flue gas of the tunnel kiln;
the bag-type dust collector system is communicated with the desulfurization system and is used for removing dust;
the urea pyrolysis system is connected with the bag-type dust collector system and is used for heating the flue gas and completely pyrolyzing the urea solution to generate ammonia gas so as to ensure that the appropriate reaction temperature range of the denitration catalyst is reached; to catalyst regeneration, guarantee that the catalyst has the intensification system of stable denitration effect in chemical life. Be linked together with urea pyrolysis system for handle nitrogen oxide's deNOx systems
Further, the desulfurization system is provided with a desulfurizing tower, the desulfurizing tower is communicated with the tunnel kiln outlet flue through the flue, and a spray gun for spraying out a desulfurizing agent is arranged inside the desulfurizing tower.
Further, a bag-type dust collector is installed at the flue outlet of the desulfurizing tower, and an ash discharge port is installed at the bottom of the desulfurizing tower.
Further, the bag-type dust collector system is provided with a pulse bag-type dust collector, and a dust collecting and filtering device, a blowing ash cleaning and discharging device, a protection and control detection device and an electric control device are installed in the pulse bag-type dust collector.
Furthermore, the pulse bag-type dust collector is provided with an upper box body, a middle box body, an air inlet channel, an ash bucket assembly, an access door and a support.
The dust collecting and filtering device is provided with a filter bag, a bag cage, a pattern plate assembly and an air inlet distribution device.
Furthermore, the blowing ash-removing and unloading device consists of an air storage bag, an electromagnetic pulse valve, a blowing pipe assembly, a bin wall vibrator and a star-shaped ash unloading valve.
Further, the protection and control detection device is composed of a differential pressure device, a charge level indicator, a temperature measuring instrument, a pressure detection device and a pulse control instrument.
Furthermore, the electric control device consists of a PLC main control cabinet, a dust remover field control cabinet, a lighting system and a power socket for maintenance.
Further, the urea pyrolysis system is provided with a pyrolysis furnace, and the pyrolysis furnace is communicated with the inlet of the denitration reactor and the outlet of the bag-type dust collector
Further, the heating system is provided with a burner and a urea solution atomizing spray gun.
Further, the denitration system is provided with a denitration reactor, the denitration reactor is communicated with a dust remover outlet flue and a fan inlet flue through a flue, a denitration catalyst is arranged in the denitration reactor to perform denitration catalytic reaction, an acoustic wave soot blower is arranged to perform ash removal treatment regularly, and a rectification grid is arranged to flow equalize the flue gas.
Combine foretell all technical scheme, the utility model discloses the advantage that possesses and positive effect are:
first, administer to tunnel cave flue gas, the utility model discloses a large amount of market research and relevant experiments, final research out tunnel cave flue gas desulfurization dust removal deNOx systems, this system can guarantee stable up-to-standard operation in the middle of administering to tunnel cave's flue gas, and reduction equipment working costs that can the at utmost, does not have "white smoke", a small amount of solid useless, operation easy operation.
Second, adopt low temperature SCR technique, utilize tunnel cave flue gas as urea pyrolysis ammonia production heat source, the cooperation hot-blast furnace intensifies and carries out urea pyrolytic reaction, has saved heat source in the urea pyrolysis technology, realizes urea solution direct pyrolysis in the high temperature pyrolysis stove, directly causes the denitration reactor entry by the fan, cooperates low temperature SCR reactor and the catalyst of rear end, realizes efficient denitration efficiency, and the cost can greatly reduced.
And thirdly, through technological optimization, by combining a gas powder conveying mass transfer theory and a fluid mechanics theory, optimizing parameters such as spray gun arrangement, spray angle and the like and matching with bag dust removal, the full mixing of sodium bicarbonate and flue gas is realized, the sodium bicarbonate reacts completely, the desulfurization efficiency can reach more than 99 percent, the generation amount of solid waste can be greatly reduced, the moisture content in the flue gas is very low, the condition of white smoke plume does not exist, and the method is more applicable and more economical.
Fourthly, the complex operation condition of the tunnel kiln can be adapted, and the desulfurization, denitrification and dedusting of the flue gas are realized; the dry desulfurization can absorb water generated by natural gas, and has a good protection effect on the catalyst; the dry desulphurization can not generate 'white smoke'; the energy consumption is reduced to the maximum extent by utilizing the heat exchange and pyrolysis of the kiln flue gas.
Fifthly, according to the contrast of the established projects, the daily operating cost of the project heated by the heating furnace is about 40000 yuan, and the daily operating cost of the project heated by the heat exchange and dry desulphurization is about 5000 yuan, so that the difference is huge. According to comparison, compared with the conventional daily operating cost of a project for heating by using a heating furnace, the novel technology saves the operating cost by 87.5 percent; the operation is simple, and the full-automatic operation can be realized. The contrast tradition wet flue gas desulfurization can not produce waste water, and the basic problem of getting rid of corrosion has significantly reduced area, and reuse can be collected to the solid useless of formation, and last residue can be used to cement plant and civil engineering's ground backfill in, and the influence of furthest's reduction to the environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
FIG. 1 is a view of the embodiment of the present invention, which provides a structure of a tunnel kiln flue gas desulfurization, dust removal and denitration system.
FIG. 2 is a schematic diagram of a flue gas desulfurization, dust removal and denitration system for a tunnel kiln provided by the embodiment of the utility model.
In the figure: 1. a powder bin; 2. a dry desulfurization tower; 3. a bag-type dust collector; 4. a hot blast stove; 5. a burner; 6. a urea solution spray gun; 7. a denitration reactor; 8. a catalyst; 9. a sound wave soot blower; 10. an induced draft fan; 11. and (4) a chimney.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Problem to prior art existence, the utility model provides a tunnel cave flue gas desulfurization dust removal deNOx systems, it is right to combine the figure below the utility model discloses do detailed description.
This tunnel cave flue gas desulfurization dust removal deNOx systems includes that the storage of flue gas system, deNOx systems, urea and preparation system, urea solution measurement distribution system, desulfurization system, sack cleaner system, heat transfer system, intensification system.
The heat exchanger is communicated with an outlet flue of the tunnel kiln, the dry desulfurization tower 2 is matched with a corresponding powder adding device, the heat exchanger is connected with the dry desulfurization tower 2, the dry desulfurization tower 2 is matched with a corresponding feeding device, the dust remover is connected with the dry desulfurization tower 2 for the purpose of removing dust, the denitration reactor 7 is connected with the bag-type dust remover 3, and the denitration reactor 7 is connected with the fan for directly discharging flue gas. The heat source of the heat exchanger is introduced from combustion-supporting air flue gas at the high-temperature section of the tunnel kiln, and the heat exchanger and the kiln exhaust flue gas are subjected to temperature rise and heat exchange. The dry desulfurization tower 2 is matched with a powder adding device, and soda powder is sprayed into the tower to react in a pneumatic conveying mode. The dry desulfurization tower 2 is matched with a bag-type dust remover 3. The flue gas of the urea pyrolysis furnace is heated by a hot-blast stove 4 for pyrolysis.
1. Desulfurization system
The desulfurizing tower is the desulfurizing core part of the device. And the flue gas at the outlet of the tunnel kiln enters the desulfurizing tower from the bottom of the reaction tower. The desulfurizer is sprayed into the bottom of the desulfurizing tower, a special spray gun is arranged in the desulfurizing tower and is mixed with the flue gas in the reaction tower at a high mass transfer rate to play a role in activating reaction ions, and the activated sodium bicarbonate particles and SO in the flue gas at the high mass transfer rate2Mixing acidic substances for reaction to generate Na2SO4And Na2SO3And the like. The flue gas carries the baking soda to the bag-type dust remover 3 after passing through the desulfurizing tower, and the baking soda which is not completely reacted is consumed by continuous reaction in the bag-type dust remover 3. A small part of the dry products are discharged from an ash discharge port at the bottom of the reaction tower, and most of the dry products enter a bag-type dust collector 3 along with the flue gas.
The desulfurizer is stored in a bag mode, and the system is provided with a desulfurizer powder bin 1. The hopper is provided with an electric feeder to feed a downstream system, and the amount of the sodium bicarbonate can be controlled by adopting a mode of matching pneumatic ash conveying with star-shaped feeding, so that the operation cost is reduced.
2. Urea pyrolysis system
The heat source is taken from hot-blast furnace 4 heating flue gas, can heat up to more than 900 ℃, sets up the pyrolysis oven on the flue, spouts the urea solution in order to reach the effect of pyrolysis in the pyrolysis oven, and the ammonia after the pyrolysis leads to denitration reactor 7 entry.
3. Heat exchange system
Because tunnel kiln exhaust gas temperature has the low temperature condition, denitration and desulfurization efficiency can't guarantee, so need heat transfer of rising temperature with the help of the hot flue gas behind the tunnel kiln high temperature section to discharging fume.
The heat exchanger is arranged on the smoke exhaust flue of the tunnel kiln, the smoke exhaust flue is guided to the tunnel kiln by utilizing the high-temperature smoke at 550 ℃ of the tunnel kiln to heat and exchange the smoke exhaust flue, the temperature of the smoke exhaust flue after heating can reach 230 ℃, and the temperature conditions of desulfurization reaction and denitration reaction are met.
4. Temperature raising system
Set up a combustor 5 at the denitration front end, play the flue gas intensification effect when the flue gas heat transfer does not reach 230 ℃, guarantee to reach the suitable reaction temperature scope of denitration catalyst 8. In addition, the temperature is periodically raised to 350 ℃, and the catalyst 8 is regenerated, so that the catalyst 8 is ensured to have a stable denitration effect within the chemical life. 5. Bag-type dust collector 3 system
The main equipment of the bag-type dust collector 3 system is a pulse bag-type dust collector 3.
The long-bag low-pressure pulse dust collector has five systems:
1) a body: it comprises an upper box body, a middle box body, an air inlet channel, an ash bucket assembly, an access door, a bracket and the like. For the body, the second party carries out strength design with the most unfavorable load combination in design; the thickness of the shell is 6mm and is made of Q235 plates.
2) Gather dust, filtration system: mainly comprises a filter bag, a bag cage, a pattern plate component and an air inlet distribution system.
3) Blowing ash removal and unloading system: the device mainly comprises a gas storage bag (comprising an oil-water separator and a pressure regulating device), an electromagnetic pulse valve, a blowing pipe assembly, a bin wall vibrator, a star-shaped ash discharge valve and the like.
4) Protection and control, detecting system: the device mainly comprises a differential pressure device, a charge level indicator, a temperature measuring instrument, a pressure detecting device, a pulse control instrument and the like.
5) An electric control system: mainly comprises a PLC main control cabinet, a dust remover field control cabinet, a lighting system and a power socket for maintenance.
6. Denitration system
The denitration system comprises a denitration reactor 7, and a rectification grid, a catalyst 8, an acoustic soot blower 9, a urea injection system and the like are arranged in the denitration reactor.
The flow field of the flue gas entering the denitration reactor 7 is uniformly distributed by the rectification grids, so that the flue gas can uniformly pass through the catalyst 8 and the reaction is complete.
The catalyst 8 is a core device of the whole denitration reaction, and can convert nitrogen oxides in the flue gas into nitrogen at the temperature of more than 180 ℃.
The working process and principle are as follows:
as shown in figures 1 and 2, the flue gas of the tunnel kiln enters the system, wherein a flue gas of combustion-supporting air at a high-temperature section at the tail of the tunnel kiln is introduced to heat and exchange the flue gas of the exhaust smoke, the combustion-supporting air after heat exchange returns to the kiln to be continuously used as combustion-supporting air for production, the flue gas of the exhaust smoke is heated and mixed with other flue gas to increase the temperature of the flue gas, and the flue gas reaches an active temperature range of desulfurization reaction,
the flue gas enters a dry-method desulfurizing tower 2 and reacts with sodium bicarbonate to eliminate sulfur dioxide in the flue gas.
The desulfurizing tower is the desulfurizing core part of the device. And the flue gas at the outlet of the tunnel kiln enters the desulfurizing tower from the bottom of the reaction tower. The desulfurizer is sprayed to the bottom of the desulfurization tower and mixed with the flue gas in the reaction tower at a high mass transfer rate to activate reaction ions, and the activated sodium bicarbonate particles and SO in the flue gas at the high mass transfer rate2Mixing acidic substances for reaction to generate Na2SO4And Na2SO3And the like. A small part of the dry products are discharged from an ash discharge port at the bottom of the reaction tower, and most of the dry products enter a bag-type dust collector 3 along with the flue gas.
The flue gas desulfurization reaction system mainly comprises a desulfurization system, a desulfurizer storage system, a desulfurizer conveying system, an external ash discharge system and the like. The flue gas of the tunnel kiln enters the throat at the lower part of the desulfurizing tower through the flue and enters the desulfurizing tower through the air distribution device. The desulfurizing agent is sprayed into the desulfurizing tower from a spray pipe at the lower part of the desulfurizing tower, is mixed with the flue gas in the desulfurizing tower at a high mass transfer rate, and reacts with SO2 in the flue gas to generate reaction products such as sulfate, sulfite and the like, thereby removing acidic substances such as SO2 and the like in the flue gas. The desulfurizing agent jetting system for desulfurizing tower is conveyed to desulfurizing tower for reaction.
The system is suitable for the load change range of the tunnel kiln, and is 80-110%.
The desulfurizer is stored in a bag mode, and the system is provided with a desulfurizer powder bin 1. The hopper is provided with an electric feeder for feeding a downstream system, and the hopper is provided with a necessary ladder stand and a necessary platform.
A manual gate valve and an electric gate valve are arranged at the discharge hole of the hopper. The manual gate valve is used when the electric gate valve is overhauled; the electric gate valve is a switch for controlling the feed opening.
The feeder can also be started at full load. The feeder is provided with a feeding amount adjusting controller, and the adjusting range can reach the variable feeding amount from 0-110%.
The metering precision of the feeder is +/-5%, and the control precision is +/-10%.
The sodium bicarbonate is transported to the ton bag chamber for storage through the truck, lifted to the hopper through the electric hoist, and conveyed to the desulfurizing tower through the feeder below the hopper after being put into the hopper.
Part of the baking soda can not completely react in the spraying process, an ash bucket is arranged at the bottom of the desulfurization tower for collection, and the baking soda is thrown into the powder bin 1 again in a manual feeding mode for continuous utilization and repeated reaction, so that the consumption of the baking soda can be greatly reduced.
The flue gas after desulfurization enters the bag-type dust collector 3, the dust is captured by the bag, the collection of sodium bicarbonate and other dust is achieved, the flue gas continues to carry out desulfurization reaction on the bag after passing through, and the desulfurization efficiency is ensured. The dust remover is provided with a PLC automatic control system for blowing and conveying dust regularly. The flue gas with the temperature of 900 ℃ discharged from the hot blast stove 4 is lifted to the temperature of more than 200 ℃ on one hand, and the sprayed urea solution is subjected to high-temperature pyrolysis to generate ammonia gas, and the ammonia gas and the nitrogen oxide in the flue gas are mixed to enter a denitration reactor 7 to remove the nitrogen oxide under the action of a catalyst 8, and the SCR reactor is arranged outdoors. The flue gas enters the catalyst 8 layer from the top after being uniformly reserved, and is discharged and collected from the bottom and then discharged into a chimney 11. An ammonia gas injection system is arranged on a flue before the flue enters the SCR reactor, and flue gas and ammonia gas are fully mixed and then enter the reactor to react with a catalyst 8 to remove NOx.
The tunnel kiln flue gas desulfurization, dust removal and denitration system selects the honeycomb type SCR catalyst 8, and has the function of accelerating and promoting the oxidation-reduction reaction rate of NH3 and NOx in flue gas in a designed temperature range (180-230 ℃) so as to accelerate the reaction rate of converting NOx into N2, thereby reducing the emission of NOx. The operation of the selected catalyst 8 meets the design denitration efficiency of not less than 90%. The catalyst 8 volume can meet the requirements regarding denitration efficiency, ammonia slip, etc. before adding a new catalyst 8.
The catalyst 8 is the core of the whole SCR system, and the selection and the reaction time of the catalyst 8 are main factors influencing the denitration efficiency. According to the engineering experience of the I, the selected catalyst 8 is high in activity. Under the cooperation of an excellent injection system and a mixing device, the nitrogen oxide removal rate of the whole system is high, so that the emission of NOx is reduced. And finally, discharging the flue gas subjected to denitration treatment by a fan. The smoke discharging temperature is above 150 ℃, and no white smoke is generated. The draft equipment list of the tunnel kiln flue gas desulfurization, dust removal and denitration system is as follows:
cloth bag dust removal
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be covered within the protection scope of the present invention by those skilled in the art within the technical scope of the present invention.
Claims (10)
1. The utility model provides a tunnel cave flue gas desulfurization dust removal deNOx systems, its characterized in that, tunnel cave flue gas desulfurization dust removal deNOx systems is provided with:
the desulfurization system is used for desulfurizing the flue gas of the tunnel kiln;
the bag-type dust collector system is communicated with the desulfurization system and is used for removing dust;
a urea pyrolysis system connected with the bag-type dust collector system;
the heating system is used for regenerating the catalyst and ensuring that the catalyst has a stable denitration effect in the chemical life;
and the denitration system is communicated with the urea pyrolysis system and is used for treating the nitrogen oxides.
2. The system for desulfurizing, dedusting and denitrating the flue gas of the tunnel kiln according to claim 1, wherein the desulfurization system is provided with a desulfurization tower which is communicated with a flue at the outlet of the tunnel kiln through the flue, and a spray gun for spraying a desulfurizing agent is arranged inside the desulfurization tower.
3. The system for desulfurizing, dedusting and denitrating the flue gas of the tunnel kiln as recited in claim 2, wherein a bag-type dust remover is installed at the flue outlet of the desulfurizing tower, and an ash discharge port is installed at the bottom of the desulfurizing tower.
4. The system for desulfurizing, dedusting and denitrating the flue gas of the tunnel kiln according to claim 1, wherein the bag-type dust remover system is provided with a pulse bag-type dust remover, and a dust collecting and filtering device, a blowing ash cleaning and discharging device, a protection and control detection device and an electric control device are installed in the pulse bag-type dust remover.
5. The system for desulfurizing, dedusting and denitrating the flue gas of the tunnel kiln according to claim 4, wherein the pulse bag-type dust remover is provided with an upper box body, a middle box body, an air inlet channel, an ash bucket assembly, an access door and a bracket;
the dust collecting and filtering device is provided with a filter bag, a bag cage, a pattern plate assembly and an air inlet distribution device.
6. The system for desulfurizing, dedusting and denitrating the flue gas of the tunnel kiln according to claim 4, wherein the blowing ash-removing and ash-discharging device consists of a gas storage bag, an electromagnetic pulse valve, a blowing pipe assembly, a bin wall vibrator and a star-shaped ash-discharging valve.
7. The system for desulfurization, dust removal and denitration of flue gas in a tunnel kiln according to claim 4, wherein the protection and control detection device is composed of a differential pressure device, a charge level indicator, a temperature measuring instrument, a pressure detection device and a pulse control instrument.
8. The system for desulfurization, dust removal and denitration of flue gas in a tunnel kiln as claimed in claim 4, wherein the electric control device is composed of a PLC main control cabinet, a dust remover field control cabinet, an illumination system and a power socket for maintenance.
9. The system for desulfurizing, dedusting and denitrating the flue gas of the tunnel kiln according to claim 1, wherein the urea pyrolysis system is provided with a pyrolysis furnace, and the pyrolysis furnace is communicated with an inlet of the denitration reactor and an outlet of a bag-type dust remover; the heating system is provided with a burner and a urea solution atomizing spray gun.
10. The system for desulfurization, dust removal and denitration of tunnel kiln flue gas according to claim 1, wherein the denitration system is provided with a denitration reactor, the denitration reactor is communicated with a dust remover outlet flue and a fan inlet flue through the flue, a denitration catalyst is installed in the denitration reactor for denitration catalytic reaction, an acoustic wave soot blower is arranged for periodic ash removal treatment, and a rectifying grid is arranged for flow equalization of flue gas.
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