CN210278758U - Super-clean emission treatment device for flue gas of household garbage incinerator - Google Patents

Super-clean emission treatment device for flue gas of household garbage incinerator Download PDF

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CN210278758U
CN210278758U CN201921108546.3U CN201921108546U CN210278758U CN 210278758 U CN210278758 U CN 210278758U CN 201921108546 U CN201921108546 U CN 201921108546U CN 210278758 U CN210278758 U CN 210278758U
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flue gas
wet
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fly ash
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陆大银
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Shanghai Gem Environmental Technology Engineering Co ltd
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Shanghai Gem Environmental Technology Engineering Co ltd
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Abstract

The utility model provides a domestic waste incinerator flue gas ultra-clean discharges processing apparatus, including waste incinerator, SNCR denitrification facility, half dry reaction tower, bag collector, saturated steam heater, SCR denitrification facility, flue gas-gas heat exchanger, wet-type scrubbing tower, wet-type electrostatic precipitator, effluent treatment plant, absorbent conveyor and adsorbent conveyor. The ultra-clean emission treatment device for the household garbage incinerator flue gas provided by the device realizes the ultra-clean emission requirement of the household garbage incinerator flue gas; and by arranging the fly ash treatment device and the desulfurization wastewater treatment device, the comprehensive disposal and the cyclic utilization of pollutants are realized.

Description

Super-clean emission treatment device for flue gas of household garbage incinerator
Technical Field
The utility model relates to a flue gas pollution administers the field, concretely relates to domestic waste burns burning furnace flue gas ultra-clean emission processing apparatus.
Background
The pollutants generated by the incineration of garbage mainly comprise SO2HCl, HF, NOx, CO, inhalable particles, dioxin, heavy metals and the like, and the treated smoke needs to reach emission standards such as the Standard for controlling pollutants generated by burning household garbage (GB18485-2014) and the Standard for emission of European Union (2000/76/EC). In recent years, the European Union standard has become the basic emission requirement of new or re-expanded projects in China, and many local standard parameters of certain pollutant emphasis monitoring areas in China are still slightly stricter than the European Union standard, so that the concept of 'ultra-clean emission' is generated. For the waste incineration project, the flue gas emission index of the 'ultra-clean emission' is that NOx is less than or equal to 50mg/Nm3、SO2≤35mg/Nm3、HCl≤5mg/Nm3Smoke dust less than or equal to 5mg/Nm3. The emission standard becomes stricter, the development of the flue gas purification process is promoted, and a new flue gas purification treatment process is continuously explored and researched.
At present, a waste incineration flue gas purification system basically adopts two or more flue gas combined processes, such as semidry method + dry deacidification, activated carbon injection adsorption of dioxin, bag type dust collector dust removal and the like, and the requirement of ultra-clean discharge is difficult to achieve. Therefore, a new ultra-clean emission treatment device for the flue gas of the household garbage incinerator needs to be developed urgently to meet new emission requirements.
Disclosure of Invention
The utility model provides a domestic waste incinerator flue gas ultra-clean discharges processing apparatus, through add devices such as dry-process deacidification, activated carbon injection, wet flue gas desulfurization, wet electric dust removal and SCR denitration on traditional SNCR denitration, semi-dry deacidification, dry-process deacidification, activated carbon injection and the device of bag dust removal for outer flue gas of arranging reaches the requirement that the ultra-clean discharged, and through setting up flying dust processing apparatus and desulfurization effluent treatment plant, the by-product that produces flue gas processing apparatus is synthesized and is dealt with.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a domestic waste incinerator flue gas ultra-clean discharges processing apparatus which characterized in that includes: the garbage incinerator is used for discharging smoke generated after garbage incineration; the SNCR denitration device is arranged in a flue gas outlet pipeline of the garbage incinerator and is used for removing nitrogen oxides in flue gas; the semi-dry reaction tower is communicated with the SNCR denitration device and is used for removing acid gas in the flue gas and reducing the temperature of the flue gas; the bag type dust collector is communicated with the semi-dry type reaction tower and is used for removing particulate matters in the flue gas; and the fly ash treatment device is communicated with the semi-dry reaction tower and an ash bucket at the bottom of the belt type dust collector and is used for treating the particulate matters collected by the semi-dry reaction tower and the bag type dust collector. The saturated steam heater is communicated with the belt type dust remover and is used for heating the flue gas to reach the temperature required by the subsequent reaction device; the SCR denitration device is communicated with the saturated steam heater and is used for further removing nitrogen oxides in the flue gas; the flue gas-flue gas heat exchanger is communicated with the SCR denitration device and is used for adjusting the temperature of the flue gas, so that the discharged flue gas becomes unsaturated flue gas and colored smoke plume is eliminated; the wet type washing tower is communicated with the flue gas-flue gas heat exchanger and is used for removing residual trace acidic substances in the flue gas; the wet electric dust remover is respectively communicated with the wet washing tower and the flue gas-flue gas heat exchanger and is used for removing residual fine particulate matters in the flue gas; the wastewater treatment device is communicated with the wet-type washing tower and the wet-type electric dust remover and is used for treating wastewater discharged by the wet-type washing tower and the wet-type electric dust remover and conveying the treated purified water to the wet-type washing tower for recycling; and an absorbent conveying device and an adsorbent conveying device are respectively arranged between the semi-dry reaction tower and the bag-type dust collector and are used for conveying slaked lime and activated carbon into a flue between the semi-dry reaction tower and the bag-type dust collector.
Further, the fly ash treatment device sequentially comprises a fly ash conveying device, a fly ash receiving and storing bin, a fly ash stabilizing and mixing device, a stabilized fly ash curing and conveying machine and a stabilized fly ash storing bin.
Furthermore, the wastewater treatment device sequentially comprises a neutralization sedimentation tank, a heavy metal sedimentation tank, a flocculation sedimentation tank and a backwashing filter device.
Further, the flue gas-flue gas heat exchanger is connected with an induced draft fan, and the induced draft fan conveys the flue gas to a chimney for emission.
Furthermore, the semi-dry reaction tower comprises a rotary atomizer, the rotary atomizer is arranged at the top end inside the reaction tower and is arranged in a reverse direction with the inlet flue of the semi-dry reaction tower, so that the lime slurry and acidic components in the flue gas are ensured to fully react, and meanwhile, the temperature of the flue gas is utilized to completely evaporate the atomized lime slurry.
Compared with the prior art, the utility model discloses a domestic waste incinerator flue gas ultra-clean discharges processing apparatus has following beneficial effect:
(1) devices such as dry deacidification, activated carbon injection, wet desulphurization, wet electric dust removal, SCR denitration and the like are added on the traditional SNCR denitration process, semi-dry deacidification process and electric bag dust removal process, and the flue gas discharged from the domestic waste incinerator after being treated by the device can meet the strictest flue gas emission requirements at home and abroad, so that the ultra-clean emission of the flue gas is realized;
(2) by arranging the fly ash treatment device and the desulfurization wastewater treatment device, by-products such as fly ash and wastewater generated by the flue gas treatment device are treated, and the treated and purified wastewater can be recycled to the wet-type washing tower, so that the comprehensive treatment and cyclic utilization of pollutants are realized.
Drawings
The invention will be described in further detail with reference to the following drawings and embodiments:
fig. 1 is a schematic structural view of a specific embodiment of the ultra-clean emission treatment device for the flue gas of the household garbage incinerator of the present invention;
FIG. 2 is a schematic structural view of a fly ash treatment apparatus according to the present invention;
FIG. 3 is a schematic view of the wastewater treatment apparatus of the present invention;
fig. 4 is a schematic structural diagram of another embodiment of the ultra-clean emission treatment device for the flue gas of the household garbage incinerator of the present invention.
The reference numbers illustrate:
1-a garbage incinerator; 2-SNCR denitration apparatus; 3-a semi-dry reaction tower; 4-an absorbent delivery device; 5-an adsorbent delivery device; 6-bag type dust collector; 7-fly ash treatment plant; 8-saturated steam heater; 9-SCR denitration device; 10-flue gas heat exchanger; 11-a wet scrubber tower; 12-wet electric dust collector; 13-a wastewater treatment plant; 14-a draught fan; 15-a chimney; 71-a fly ash conveyor; 72-fly ash receiving silo; 73-fly ash stabilization mixing device; 74-stabilized fly ash curing conveyor; 75-stabilized fly ash storage; 131-a neutralization sedimentation tank; 132-heavy metal sedimentation tank; 133-a flocculation sedimentation tank; 134 backflushing the filter apparatus.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the utility model discloses a domestic waste incinerator flue gas ultra-clean discharges processing apparatus, include: the incinerator comprises a garbage incinerator 1 and an SNCR denitration device 2, wherein the garbage incinerator 1 is used for discharging flue gas generated after garbage incineration, and the SNCR denitration device 2 is arranged in a flue gas outlet pipeline of the garbage incinerator 1 and is used for removing nitrogen oxides in the flue gas; the semi-dry reaction tower 3 is communicated with the SNCR denitration device 2 and is used for removing acid gas in the flue gas and reducing the temperature of the flue gas; the bag type dust collector 6 is communicated with the semi-dry type reaction tower 3 and is used for removing particulate matters in the flue gas; and the fly ash treatment device 7 is communicated with the semi-dry reaction tower 3 and an ash hopper at the bottom of the belt type dust collector 6 and is used for treating the particulate matters collected by the semi-dry reaction tower 3 and the bag type dust collector 6. The saturated steam heater 8 is communicated with the belt type dust remover 6 and used for heating the flue gas to reach the temperature required by the subsequent reaction device; the SCR denitration device 9 is communicated with the saturated steam heater 8 and is used for further removing nitrogen oxides in the flue gas; the flue gas-flue gas heat exchanger 10 is communicated with the SCR denitration device 9 and is used for adjusting the temperature of the flue gas, so that the discharged flue gas becomes unsaturated flue gas and colored smoke plume is eliminated; the wet scrubber tower 11 is communicated with the flue gas-flue gas heat exchanger 10 and is used for removing residual trace acidic substances in the flue gas; the wet electric dust remover 12 is respectively communicated with the flue gas-flue gas heat exchanger 10 and the wet washing tower 11 and is used for removing residual fine particulate matters in the flue gas; the wastewater treatment device 13 is communicated with the wet-type washing tower 11 and the wet-type electric dust remover 12 and is used for treating wastewater discharged by the wet-type washing tower 11 and the wet-type electric dust remover 12 and conveying the treated purified water to the wet-type washing tower 11 for recycling; an absorbent conveying device 4 and an adsorbent conveying device 5 are respectively arranged between the semi-dry reaction tower 3 and the bag type dust collector 6 and are used for conveying slaked lime and activated carbon into a flue between the semi-dry reaction tower 3 and the bag type dust collector 6.
Specifically, as shown in fig. 2, the fly ash treatment device 7 includes a fly ash conveyance device 71, a fly ash receiving silo 72, a fly ash stabilizing and kneading device 73, a stabilized fly ash curing conveyor 74, and a stabilized fly ash silo 75 in this order.
Specifically, as shown in fig. 3, the wastewater treatment apparatus 13 includes a neutralization sedimentation tank 131, a heavy metal sedimentation tank 132, a flocculation sedimentation tank 133, and a backwashing filter apparatus 134 in this order.
Specifically, as shown in fig. 4, the flue gas-flue gas heat exchanger 10 is connected to an induced draft fan 14, and the induced draft fan 14 connects the flue gas to a chimney 15 for emission.
Specifically, the semi-dry reaction tower 3 comprises a rotary atomizer, the rotary atomizer is arranged at the top end inside the reaction tower and is reversely arranged with an inlet flue of the semi-dry reaction tower 3, so that the lime slurry is ensured to fully react with acidic components in the flue gas, and the temperature of the flue gas is utilized to completely evaporate the atomized lime slurry.
Exemplarily, the utility model discloses a domestic waste incinerator flue gas ultra-clean discharges processing apparatus's concrete application as follows:
containing SO2The flue gas containing pollutants such as HCl, HF, NOx, CO, inhalable particles, dioxin, heavy metals and the like is discharged from an outlet of the garbage incinerator, passes through an SNCR (selective non catalytic reduction) denitration device arranged in a flue gas outlet pipeline of the garbage incinerator, and a reducing agent sprayed by the device and NOx in the flue gas are subjected to oxidation-reduction reaction to remove part of NOx in the flue gas and then enter a semi-dry type reaction tower communicated with the SNCR denitration device. A rotary atomizer for spraying lime slurry is arranged in the semi-dry reaction tower, arranged at the top end in the reaction tower and is semi-dryThe inlet flue of the reaction tower is reversely arranged, and uniformly atomized lime slurry is sprayed from top to bottom in the reaction tower, and the main chemical component of the slurry is Ca (OH)2. By the arrangement mode, SO in lime slurry and flue gas can be ensured2Acid gases such as HCl and HF and lime slurry respectively undergo acid-base neutralization reaction to generate solid salt, the solid salt is collected in an ash bucket at the bottom of the semi-dry reactor, the atomized lime slurry is completely evaporated by utilizing the temperature of the flue gas, and then the flue gas enters a horizontal flue connected between the semi-dry reaction tower and the bag-type dust collector. The horizontal flue is respectively provided with a conveying device of an absorbent and an adsorbent, which is used for conveying slaked lime and activated carbon into the flue between the semi-dry reaction tower and the bag type dust collector, wherein the sprayed slaked lime can be used as a guarantee means for removing acidic substances when the load of acidic components in the flue gas is peak, and the sprayed activated carbon mainly has the following functions: the porous structure of the adsorbent is used for adsorbing heavy metals such as Hg and organic compounds such as dioxin in smoke. Then the flue gas enters a bag type dust collector, and particulate matters such as fly ash, activated carbon for adsorbing Hg and dioxin, unreacted slaked lime and the like carried in the flue gas are collected in an ash hopper at the bottom of the dust collector by the bag type dust collector. The ash buckets at the bottoms of the semi-dry reaction tower and the bag type dust collector are connected with a fly ash treatment device. The fly ash is conveyed to a fly ash receiving bin by a fly ash conveying device, and then conveyed to a fly ash stabilizing and mixing device to carry out chemical reaction with an additional fly ash chelating agent so as to carry out solidification and stabilization treatment on the fly ash. The fly ash after solidification and stabilization enters a stabilized fly ash storage bin through a fly ash curing conveyor to wait for subsequent landfill treatment. And the flue gas continuously enters a saturated steam heater communicated with the bag type dust collector, the flue gas is heated to the temperature required by the subsequent SCR denitration reaction, and the flue gas enters an SCR denitration device to further remove residual NOx in the flue gas. Through SNCR and SCR two-stage denitrification facility, can guarantee that the total denitration efficiency of flue gas is above 90%. A flue gas-flue gas heat exchanger is arranged behind the SCR denitration device and is used for recovering heat energy in the flue gas and reducing the temperature of the flue gas, then the flue gas enters a wet type washing tower, the washing tower adopts a spraying empty tower, and a limestone-gypsum wet process is adopted to remove the residual trace acid substances in the flue gasAnd (4) quality. And then the flue gas enters a wet electric dust collector connected with a wet washing tower, and is used for removing dust and liquid drops carried in the saturated wet flue gas and preventing gypsum rain pollution. The sewage discharge outlets of the wet washing tower and the wet electric precipitator are connected to a wastewater treatment device, wastewater is treated by a neutralization sedimentation tank, a heavy metal sedimentation tank, a flocculation sedimentation tank and a backwashing filter device in sequence, sludge generated by treatment is sent to a landfill for subsequent treatment, and purified water is conveyed to the wet washing tower to be used as limestone slurry spraying water for recycling. The flue gas enters a flue gas-flue gas heat exchanger after dust and liquid drops are collected by a wet electric dust collector, the flue gas exchanges heat with the flue gas at the outlet of an SCR denitration device, the energy of hot flue gas is utilized to heat the saturated wet flue gas at a lower temperature, the discharged flue gas is changed into unsaturated flue gas, and the phenomenon that white smoke is eliminated by the discharged flue gas is ensured. The back of the flue gas-flue gas heat exchanger is connected with an induced draft fan, and the induced draft fan connects the flue gas to a chimney to be discharged up to the standard, so that the whole treatment process of ultra-clean emission of the flue gas of the incinerator is completed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. The utility model provides a domestic waste incinerator flue gas ultra-clean discharges processing apparatus which characterized in that includes:
the garbage incinerator is used for discharging smoke generated after garbage incineration;
the SNCR denitration device is arranged in a flue gas outlet pipeline of the garbage incinerator and is used for removing nitrogen oxides in flue gas;
the semi-dry reaction tower is communicated with the SNCR denitration device and is used for removing acid gas in the flue gas and reducing the temperature of the flue gas;
the bag type dust collector is communicated with the semi-dry type reaction tower and is used for removing particulate matters in the flue gas;
the fly ash treatment device is communicated with the semi-dry reaction tower and an ash bucket at the bottom of the belt type dust collector and is used for treating the particulate matters collected by the semi-dry reaction tower and the bag type dust collector;
the saturated steam heater is communicated with the belt type dust remover and is used for heating the flue gas to reach the temperature required by the subsequent reaction device;
the SCR denitration device is communicated with the saturated steam heater and is used for further removing nitrogen oxides in the flue gas;
the flue gas-flue gas heat exchanger is communicated with the SCR denitration device and is used for adjusting the temperature of the flue gas, so that the discharged flue gas becomes unsaturated flue gas and colored smoke plume is eliminated;
the wet type washing tower is communicated with the flue gas-flue gas heat exchanger and is used for removing residual trace acidic substances in the flue gas;
the wet electric dust remover is respectively communicated with the wet washing tower and the flue gas-flue gas heat exchanger and is used for removing residual fine particulate matters in the flue gas;
the wastewater treatment device is communicated with the wet-type washing tower and the wet-type electric dust remover and is used for treating wastewater discharged by the wet-type washing tower and the wet-type electric dust remover and conveying the treated purified water to the wet-type washing tower for recycling;
and an absorbent conveying device and an adsorbent conveying device are respectively arranged between the semi-dry reaction tower and the bag-type dust collector and are used for conveying slaked lime and activated carbon into a flue between the semi-dry reaction tower and the bag-type dust collector.
2. The ultra-clean emission treatment device for the flue gas of the household garbage incinerator according to the claim 1, characterized in that:
the fly ash treatment device sequentially comprises a fly ash conveying device, a fly ash receiving and storing bin, a fly ash stabilizing and mixing device, a fly ash curing and conveying machine and a stabilized fly ash storing bin.
3. The ultra-clean emission treatment device for the flue gas of the household garbage incinerator according to the claim 1, characterized in that:
the wastewater treatment device sequentially comprises a neutralization sedimentation tank, a heavy metal sedimentation tank, a flocculation sedimentation tank and a backwashing filter device.
4. The ultra-clean emission treatment device for the flue gas of the household garbage incinerator according to the claim 1, characterized in that:
the flue gas-flue gas heat exchanger is connected with an induced draft fan, and the induced draft fan conveys the flue gas to a chimney for emission.
5. The ultra-clean emission treatment device for the flue gas of the household garbage incinerator according to the claim 1, characterized in that:
the semi-dry reaction tower comprises a rotary atomizer, the rotary atomizer is arranged at the top end inside the reaction tower and is reversely arranged with an inlet flue of the semi-dry reaction tower, so that the lime slurry is ensured to fully react with acidic components in the flue gas, and meanwhile, the temperature of the flue gas is utilized to completely evaporate the atomized lime slurry.
CN201921108546.3U 2019-07-16 2019-07-16 Super-clean emission treatment device for flue gas of household garbage incinerator Active CN210278758U (en)

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CN201921108546.3U CN210278758U (en) 2019-07-16 2019-07-16 Super-clean emission treatment device for flue gas of household garbage incinerator

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112076614A (en) * 2020-09-17 2020-12-15 山东联化新材料有限责任公司 Desulfurization absorption device for needle coke production process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112076614A (en) * 2020-09-17 2020-12-15 山东联化新材料有限责任公司 Desulfurization absorption device for needle coke production process

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