CN217662500U

CN217662500U - Household garbage incinerator nitrogen oxide combined removal system based on bag dust removal

Info

Publication number: CN217662500U
Application number: CN202221088314.8U
Authority: CN
Inventors: 黄新升
Original assignee: Zhejiang Rongzhi Energy Technology Co ltd
Current assignee: Zhejiang Rongzhi Energy Technology Co ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-10-28
Anticipated expiration: 2032-05-06

Abstract

The utility model discloses a domestic waste burns burning furnace nitrogen oxide and unites desorption system based on sack removes dust. The utility model comprises an SNCR denitration device arranged on a hearth of a garbage incinerator, wherein an outlet of the garbage incinerator is connected with a desulphurization device, a cloth bag dust removal device with denitration function is arranged between the desulphurization device and an induced draft fan, and the cloth bag dust removal device is connected with an outlet of the desulphurization device through an inlet flue; the cloth bag dust removal device comprises a shell, a plurality of filter bags sprayed with denitration catalyst active substances, a sealing plate and a supporting device; and an ammonia injector is arranged in the inlet flue, and ammonia gas is injected into the flue through the ammonia injector and enters the cloth bag dust collector to act with the active substance of the denitration catalyst sprayed on the filter bag to smoothly complete denitration. The utility model discloses a sack dust collector compares traditional equipment and reduces SCR reactor and catalyst loading, has reduced the energy consumption and the area of whole equipment, and more energy-concerving and environment-protective has also further reduced manufacturing cost.

Description

Household garbage incinerator nitrogen oxide combined removal system based on bag dust removal

Technical Field

The utility model relates to a deNOx systems, specifically speaking are domestic waste burns burning furnace nitrogen oxide and unites desorption system based on sack removes dust.

Background

Incineration power generation is the main mode for harmless treatment of household garbage, but a large amount of air pollutants are inevitably discharged in the incineration treatment process, and the waste gas contains a large amount of Nitrogen Oxides (NO) _X ) The treatment is generally performed by a denitration device.

In the prior art, an SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) denitration device are two independent devices, and the SNCR technology is that a spray gun is arranged in a hearth of a garbage incinerator, and a reducing agent is sprayed to remove Nitrogen Oxides (NO) in smoke _X ) Reducing to nitrogen and water. The SCR technology is characterized in that an outlet of a dust remover is connected with a flue inlet of a denitration device, a heating device is arranged in the flue inlet of the denitration device, and a cooling device is arranged at the tail end of a flue outlet. After the flue gas is subjected to heat exchange and utilization, besides settling a part of dust particles, the temperature of the flue gas is also reduced, at the moment, the flue gas is heated to the optimal reaction temperature of the catalyst in the SCR denitration device through a heating device to be smoothly denitrated, and the denitrated flue gas is cooled through a cooling device to reach a certain temperature and then finally discharged through a chimney. The heating and cooling device arranged in the denitration device can increase extra energy consumption, is not beneficial to energy conservation and environmental protection, and increases the production cost.

In addition, SNCR technology can convert the Nitrogen Oxide (NO) of the domestic garbage incinerator _X ) The concentration is reduced to 150mg/Nm ³ About, but not satisfying 50mg/Nm ³ Ultra-low emission requirements.

SUMMERY OF THE UTILITY MODEL

In view of the above prior artThe defect that exists, the utility model provides a domestic waste burns burning furnace nitrogen oxide and unites desorption system based on sack removes dust, it burns burning furnace nitrogen oxide at ultralow emission domestic waste (NO) _X ) On the basis of the method, the energy consumption is effectively reduced, and the production cost is reduced.

Therefore, the utility model adopts the following technical proposal: the household garbage incinerator nitrogen oxide combined removal system based on bag-type dust removal comprises an SNCR (selective non-catalytic reduction) denitration device arranged on a garbage incinerator hearth, wherein an outlet of the garbage incinerator is connected with a desulfurization device, a bag-type dust removal device with a denitration function is arranged between the desulfurization device and an induced draft fan, and the bag-type dust removal device is connected with an outlet of the desulfurization device through an inlet flue;

the cloth bag dust removal device comprises a shell, a plurality of filter bags sprayed with denitration catalyst active substances, a sealing plate and a supporting device, wherein the filter bags are connected to the supporting device, the supporting device is used for supporting the filter bags, an independent cavity is formed between the filter bags and the shell through the sealing plate, the independent cavity is connected with an inlet of an induced draft fan, and the filter bags, the sealing plate and the supporting device are all positioned in the shell;

and an ammonia injector is arranged in the inlet flue, and ammonia gas is injected into the flue through the ammonia injector and enters the cloth bag dust collector to act with the active substance of the denitration catalyst sprayed on the filter bag to smoothly complete denitration.

The independent cavity ensures that the original flue gas firstly passes through the filter bag to prevent the short circuit of the original flue gas, and then the purified flue gas enters the independent cavity and finally enters the induced draft fan.

The utility model discloses a sack dust collector possesses dust removal and denitration function. The raw flue gas is uniformly mixed with the sprayed ammonia gas before entering the bag-type dust collector and then enters the bag-type dust collector to pass through the filter bag, particulate matters in the flue gas are captured by the filter bag, and simultaneously, nitrogen Oxides (NO) in the flue gas _X ) With ammonia (NH) ₃ ) Under the action of the active components of the denitration catalyst on the filter bag, reduction reaction is carried out to generate nitrogen and water, and the purified flue gas after dust removal and denitration is discharged through a chimney. The utility model discloses integrate SNCR denitrification facility to waste incineratorInside, the Nitrogen Oxide (NO) of the household garbage incinerator can be generated _X ) The emission concentration is reduced to 150mg/Nm ³ Left and right. Flue gas enters a bag-type dust remover integrated with SCR denitration function after being subjected to desulfurization and dust removal processes, so that Nitric Oxide (NO) of the household garbage incinerator can be removed _X ) The emission concentration is reduced to 50mg/Nm ³ The following ultra low emissions.

Further, the SNCR denitration device comprises a first layer of spray guns and a second layer of spray guns, and the two layers of spray guns are arranged on a hearth of the garbage incinerator. The first layer of spray gun is used for removing Nitrogen Oxides (NO) in the incinerator under the high-load working condition _X ) The second layer of spray gun is used for removing Nitrogen Oxides (NO) in the incinerator under the low-load working condition _X ). The spray gun sprays the reducing agent ammonia water into the hearth to be atomized into particles with certain size, and the Nitrogen Oxide (NO) in the flue gas is uniformly sprayed into the hearth _X ) Reducing to nitrogen and water. The arrangement positions of the first layer of spray guns and the second layer of spray guns are determined according to the temperature parameters of the flue gas of the hearth.

Furthermore, the ammonia ejector is connected with an ammonia water gasifier, one path of the ammonia water gasifier leads to hot air, and the other path leads from ammonia water.

Furthermore, the top of the filter bag is provided with a blowing device for blowing and cleaning the filter bag.

Further, the outlet of the induced draft fan is connected with a chimney.

Furthermore, the bag-type dust collector also comprises a dust hopper positioned below the filter bag.

The utility model discloses the beneficial effect who has as follows:

the utility model organically combines the SNCR denitration device, the SCR denitration device and the cloth bag dust removal device, thereby saving the cost and the space and facilitating the assembly of each part of the system; SNCR (selective non-catalytic reduction) denitration device arranged on hearth and used for burning Nitric Oxide (NO) in household garbage incinerator _X ) The furnace discharge concentration is reduced to 150mg/Nm ³ The flue gas is desulfurized and then is connected with the inlet of a cloth bag dust removal device, so that the SCR denitration of the original flue gas is completed in the dust removal process, and Nitrogen Oxides (NO) can be removed _X ) The emission concentration is reduced to 50mg/Nm ³ The following.

The utility model discloses a sack dust collector is integrated in an organic whole with traditional SCR denitrification facility and sack cleaner, compares traditional equipment and reduces SCR reactor and catalyst loading, has reduced the energy consumption and the area of whole equipment, and more energy-concerving and environment-protective has also further reduced manufacturing cost.

The utility model discloses an aqueous ammonia vaporizer and SNCR denitrification facility can share an aqueous ammonia reductant preparation station, and whole pressure loss is little, has reduced area.

Drawings

FIG. 1 is a schematic view of the present invention;

in the figure:

1. a waste incinerator; an SNCR denitration device; 3. a first layer of spray guns; 4. a second layer of spray guns; 5. a desulfurization unit; 6. an inlet flue; 7. an ammonia ejector; 8. an ammonia vaporizer; 9. a bag type dust collector; 10. a filter bag; 11. a support device; 12. an ash hopper; 13. a purging device; 14. an induced draft fan; 15. a chimney; 16. and (7) sealing the plate.

Detailed Description

The essential features of the invention will be further explained with reference to the drawings and the detailed description.

Nitrogen Oxides (NO) of garbage incinerator as shown in FIG. 1 _X ) The ultralow emission system comprises a garbage incinerator 1, an SNCR denitration device 2 arranged on a hearth of the garbage incinerator 1, a desulphurization device 5, an induced draft fan 14 and a cloth bag dust removal device 9 with a denitration function arranged between the desulphurization device 5 and the induced draft fan 14. The SNCR denitration device 2 includes reducing agent spray guns of two layers in total of the first layer spray gun 3 and the second layer spray gun 4. The raw flue gas is discharged from the garbage incinerator 1, passes through the desulphurization device 5, and then enters the cloth bag dust removal device 9 through the inlet flue 6. An ammonia injector 7 is installed in the inlet flue 6. The bag-type dust collector 9 comprises a shell, a plurality of filter bags 10 sprayed with denitration catalyst active substances, a sealing plate 16, a supporting device 11 and a blowing device 13, wherein the filter bags are connected to the supporting device, the supporting device is used for supporting the filter bags, and the filter bags, the sealing plate and the supporting device are all located in the shell. The plurality of filter bags are sealed by a sealing plate 1610 and the shell form an independent cavity which is connected with an inlet of an induced draft fan 14.

The ammonia water vaporizer 8 gasifies ammonia water into ammonia gas through hot primary air introduced from the garbage incinerator, the ammonia gas is sprayed into a flue through the ammonia injector 7, flue gas mixed with the ammonia gas enters the cloth bag dust removal device 9, and when the flue gas passes through the filter bag 10, dust removal and denitration processes are completed. The particles are settled in the ash hopper 12 and then conveyed to an ash storehouse for centralized treatment. When the dust deposition is too much and the pressure loss is increased after the filter bag 10 works for a long time, the blowing device 13 is started to blow and clean the filter bag to prevent blockage. The flue gas after dust removal and denitration is pressurized by a draught fan 14 and is finally discharged into the atmosphere through a chimney 15.

The filling quantity of the filter bags sprayed with the denitration catalyst active substances is determined according to the flue gas parameters, so that the aim of ultralow emission is fulfilled. The filter bag is filled in the bag type dust removal device, has two functions of dust removal and denitration, is stable to install and convenient to replace, and reduces the occupied area.

Finally, it is also noted that the above-mentioned list is only a specific embodiment of the present invention. The present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.

Claims

1. The household garbage incinerator nitrogen oxide combined removal system based on cloth bag dust removal comprises an SNCR (selective non-catalytic reduction) denitration device (2) installed on a hearth of a garbage incinerator (1), and an outlet of the garbage incinerator (1) is connected with a desulphurization device (5), and is characterized in that a cloth bag dust removal device (9) with a denitration function is arranged between the desulphurization device (5) and an induced draft fan (14), and the cloth bag dust removal device (9) is connected with an outlet of the desulphurization device (5) through an inlet flue (6);

the cloth bag dust removal device (9) comprises a shell, a plurality of filter bags (10) sprayed with denitration catalyst active substances, a sealing plate (16) and a supporting device (11), wherein the filter bags are connected to the supporting device, the supporting device is used for supporting the filter bags, an independent cavity is formed between the filter bags (10) and the shell through the sealing plate (16), the independent cavity is connected with an inlet of an induced draft fan (14), and the filter bags, the sealing plate (16) and the supporting device (11) are all located in the shell;

an ammonia ejector (7) is arranged in the inlet flue (6).

2. The system for jointly removing nitrogen oxides in a household garbage incinerator based on bag dedusting as claimed in claim 1, characterized in that said SNCR denitration device (2) comprises a first layer of spray guns (3) and a second layer of spray guns (4), and the two layers of spray guns are arranged on the hearth of said garbage incinerator (1).

3. The system for jointly removing nitrogen oxides in a household garbage incinerator based on bag dust removal as claimed in claim 1 or 2, characterized in that said ammonia injector (7) is connected with an ammonia water gasifier (8), and one path of said ammonia water gasifier (8) leads to hot air and the other path leads from ammonia water.

4. The system for jointly removing nitrogen oxides of the household garbage incinerator based on the bag dedusting as claimed in claim 1 or 2, characterized in that a purging device (13) is installed at the top of the filter bag (10) and used for purging and cleaning the filter bag.

5. The system for jointly removing nitrogen oxides in a household garbage incinerator based on bag dust removal as claimed in claim 1 or 2, characterized in that the outlet of said induced draft fan (14) is connected with a chimney (15).

6. The system for jointly removing nitrogen oxides of a household garbage incinerator based on bag dedusting as claimed in claim 1 or 2, characterized in that the bag dedusting device (9) further comprises an ash bucket (12) located below the filter bag.