CN211069614U - System for tail gas waste heat recovery is with stable SNCR denitration efficiency - Google Patents

System for tail gas waste heat recovery is with stable SNCR denitration efficiency Download PDF

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Publication number
CN211069614U
CN211069614U CN201921197079.6U CN201921197079U CN211069614U CN 211069614 U CN211069614 U CN 211069614U CN 201921197079 U CN201921197079 U CN 201921197079U CN 211069614 U CN211069614 U CN 211069614U
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waste heat
sncr denitration
tail gas
quenching
denitration efficiency
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CN201921197079.6U
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沈毅
陈俊宇
翁梓斌
叶芮榄
陈俊豪
许群惟
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Hangzhou Zhenglong Environmental Protection Technology Co ltd
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Hangzhou Zhenglong Environmental Protection Technology Co ltd
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Abstract

The utility model discloses a system for tail gas waste heat recovery is with stable SNCR denitration efficiency, including rotary kiln, two combustion chambers, SNCR denitrification facility, exhaust-heat boiler, quench tower and the ceramic fibre chimney filter dust removal catalytic unit that loops through pipe connection, wherein, the entry linkage of pipeline and SNCR denitrification facility is passed through in ceramic fibre chimney filter dust removal catalytic unit's export. The utility model provides a system of tail gas waste heat recovery in order to stabilize SNCR denitration efficiency has improved SNCR denitration efficiency on the one hand, and on the other hand has realized flue gas waste heat recovery.

Description

System for tail gas waste heat recovery is with stable SNCR denitration efficiency
Technical Field
The utility model relates to a tail gas treatment technical field especially relates to a system of tail gas waste heat recovery in order to stabilize SNCR denitration efficiency.
Background
In recent years, hazardous waste incineration disposal techniques have been widely used, and smoke, nitrogen oxides, sulfur oxides, acid gases, dioxins and the like in incinerated flue gas need to be properly treated, which may cause environmental pollution.
The selective non-catalytic reduction flue gas denitration technology (SNCR) is one of the commonly used denitration methods at present, and the denitration efficiency of the SNCR denitration technology is different from 30-50%. The SNCR denitration technology has high requirement on temperature, low temperature and NOXThe conversion efficiency is low, the low denitration efficiency can cause ammonia escape, the ammonia is corrosive, and the excessive ammonia escape can corrode equipment; NH at too high a temperature3It is easily oxidized into NOx, and NH is offset3And (4) removing. Therefore, stabilizing the proper temperature is one of the keys to ensure that the SNCR denitration efficiency reaches a high point.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a system of tail gas waste heat recovery in order to stabilize SNCR denitration efficiency, aims at improving SNCR denitration efficiency, realizes waste heat recovery simultaneously.
In order to realize the above object, the utility model provides a system of tail gas waste heat recovery in order to stabilize SNCR denitration efficiency, including rotary kiln, two combustion chambers, SNCR denitrification facility, exhaust-heat boiler, quench tower and the ceramic fiber filter tube dust removal catalytic unit who loops through pipe connection, wherein, the entry linkage of pipeline and SNCR denitrification facility is passed through in ceramic fiber filter tube dust removal catalytic unit's export.
Preferably, a flow control valve and an induced draft fan are further installed on a pipeline between the outlet of the ceramic fiber filter tube dust removal and catalysis device and the inlet of the SNCR denitration device; and a temperature measuring device is installed at the inlet of the SNCR denitration device.
Preferably, the outlet of the quenching tower is sequentially connected with a semi-dry deacidification system and a cyclone dust collector, and the outlet of the cyclone dust collector is connected with a ceramic fiber filter tube dedusting catalytic device.
Preferably, the semi-dry deacidification system comprises a quenching semi-dry deacidification tower, a quenching water tank and a lime slurry preparation system which are connected with the quenching semi-dry deacidification tower, and a quartz sand circulating device which is positioned at one side of the quenching semi-dry deacidification tower.
Preferably, the inlet end of the quenching semi-dry deacidification tower is further connected with an alkaline agent injection device, the cyclone dust collector is connected with the activated carbon adsorption device through a conveying pipe, a circulating storage tank is further mounted on a pipeline between the quenching semi-dry deacidification tower and the inlet end of the cyclone dust collector, and sand is contained in the circulating storage tank.
Preferably, a first nozzle for spraying a calcium-based desulfurizer is installed on the pipeline at the inlet end of the quenching semi-dry deacidification tower, and a second nozzle for spraying a sodium-based desulfurizer is installed on the pipeline at the outlet end of the quenching semi-dry deacidification tower.
Preferably, the outlet of the ceramic fiber filter tube dust removal catalytic device is connected with the inlet of the quenching tower through a pipeline, and the pipeline at the inlet end of the quenching tower is further provided with a flow control valve.
Preferably, ceramic fiber filter tube dust removal catalytic unit includes the reactor frame, erects the ceramic fiber filter tube in the reactor frame, installs the pulse that the reactor frame was gone up and spouts grey system, be located reactor frame below and rather than the steel construction support of intercommunication and be used for supporting the reactor frame, has vanadium base catalyst to decompose dioxin on the ceramic fiber filter tube.
Preferably, the outlet of the ceramic fiber filter tube dust removal catalytic device is connected with a chimney through a pipeline.
Preferably, the SNCR denitration device comprises an ammonia water temporary storage and conveying system, a compressed air system and an ammonia water injection system.
Preferably, the quenching tower is provided with a double-fluid atomization spray gun; the waste heat boiler is a four-section type waste heat boiler, and the SNCR denitration device is arranged in the first section of the waste heat boiler.
The utility model provides a system of tail gas waste heat recovery in order to stabilize SNCR denitration efficiency, clean flue gas temperature after the processing is about 200 ℃, introduces some flue gas and is used as the backward flow wind, and the flue gas of two combustion chambers exports mixes the flue gas temperature who makes entering SNCR denitrification facility with the backward flow wind and stabilizes at 850 ℃ -950 ℃, can enough waste heat recovery, can make SNCR denitrification facility's denitration efficiency stabilize about 50% again, reduces the ammonia escape. In addition, the system has good pollutant removing effect of the flue gas treatment system, and the treated discharged flue gas can adapt to increasingly strict standards.
Drawings
Fig. 1 is the utility model discloses the structure schematic diagram of tail gas waste heat recovery system in order to stabilize SNCR denitration efficiency.
In the figure, 1-rotary kiln, 2-secondary combustion chamber, 3-waste heat boiler + SNCR denitration device, 4-quench tower, 5-semidry deacidification system, 6-cyclone dust collector, 7-ceramic fiber filter tube dust removal catalytic device, 8-induced draft fan and 9-chimney.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, in the preferred embodiment, a system for recovering waste heat of tail gas to stabilize SNCR denitration efficiency includes a rotary kiln 1, a second combustion chamber 2, an SNCR denitration device, a waste heat boiler, a quench tower 4, and a ceramic fiber filter tube dedusting catalyst device 7 connected in sequence by a pipeline, wherein an outlet of the ceramic fiber filter tube dedusting catalyst device 7 is connected with an inlet of the SNCR denitration device by a pipeline.
And a flow control valve and an induced draft fan 8 are also arranged on a pipeline between the outlet of the ceramic fiber filter tube dust removal and catalysis device 7 and the inlet of the SNCR denitration device. And a temperature measuring device is installed at the inlet of the SNCR denitration device. After the flue gas at the outlet of the secondary combustion chamber 2 is mixed with the return air, the temperature of the flue gas entering the SNCR denitration device is regulated to be stabilized at 850-950 ℃ by controlling the opening degree of the flow control valve so as to improve the denitration efficiency. The induced draft fan 8 is arranged to drive flue gas to enter the SNCR denitration device. The induced draft fan 8 can adopt the frequency conversion to adjust, can control the backward flow wind size of extraction.
Further, an outlet of the quenching tower 4 is sequentially connected with a semi-dry deacidification system 5 and a cyclone dust collector 6, and an outlet of the cyclone dust collector 6 is connected with a ceramic fiber filter tube dedusting catalytic device 7. The semi-dry deacidification system 5 comprises a quenching semi-dry deacidification tower, a quenching water tank and a lime slurry preparation system which are connected with the quenching semi-dry deacidification tower, and a quartz sand circulating device positioned on one side of the quenching semi-dry deacidification tower.
The inlet end of the quenching semi-dry deacidification tower is also connected with an alkaline agent (the alkaline agent is selected from one or a combination of more of calcium hydroxide, magnesium hydroxide and calcium carbonate) injection device, the cyclone dust collector is connected with the activated carbon adsorption device through a conveying pipe, a circulating storage tank is also arranged on a pipeline between the quenching semi-dry deacidification tower and the inlet end of the cyclone dust collector, and sand is contained in the circulating storage tank. The sand and the alkaline agent form a dioxin-removing composition in the semi-dry deacidification tower.
A first nozzle for spraying the calcium-based desulfurizer is arranged on the pipeline at the inlet end of the quenching semi-dry deacidification tower, and a second nozzle for spraying the sodium-based desulfurizer is arranged on the pipeline at the outlet end of the quenching semi-dry deacidification tower.
Before entering the semi-dry deacidification tower, the calcium-based desulfurizer is sprayed in through the first nozzle, the calcium-based desulfurizer is fine in particle (the particle size is only 18 microns), and the calcium-based desulfurizer has porous adsorption characteristics and large specific surface area, so that the desulfurization reaction effect and the desulfurization efficiency are smaller, the soda is higher, the price is low, the cost performance is better, in addition, the byproducts generated after desulfurization by using the calcium-based desulfurizer are better treated than sodium-based byproducts, the treatment cost is lower, and the higher pollution control effect is achieved in a more saving mode on the whole. In addition, the calcium-based desulfurizer is sprayed in the front, the sodium-based desulfurizer is sprayed at the rear end for standby, and the design can be started according to actual conditions on site, so that more upgrading space of the system can be reserved in the future, the system can meet the stricter discharge standard in the future, the desulfurization pressure at the rear section is greatly reduced under the condition that the high-efficiency desulfurizer is used at the front section, a grinding machine (sodium bicarbonate raw material is generally coarse particles with the particle size of 200 micrometers and can be ground to about 30-50 micrometers through the grinding machine) used with the sodium-based desulfurizer is matched, the using load (including the grinding amount) can also be reduced, and therefore, the grinding machine with smaller machine type and load can be selected, the equipment investment can be saved and the operating cost can be reduced for the system.
The outlet of the ceramic fiber filter tube dust removal catalytic device 7 is connected with the inlet of the quenching tower 4 through a pipeline, and the pipeline at the inlet end of the quenching tower 4 is also provided with a flow control valve. The clean flue gas extraction part behind the induced draft fan 8 is guided into the inlet flue of the quench tower to be mixed with the original flue gas, so that the air quantity meeting the design requirement between the quench semi-dry deacidification tower and the dust remover is ensured, and the system can stably run. In addition, because the backflow pipeline interface of the inlet of the quench tower 4 is negative pressure, the combination with the variable frequency fan can lead to the large flow of backflow air which is not easy to control, so the main function of installing the flow control valve is to control the air pressure to finely adjust the extracted backflow air quantity, and the flow control valve is to perform interlocking control with the flowmeter and the variable frequency fan.
The ceramic fiber filter tube dust removal catalytic device 7 comprises a reactor frame body, a ceramic fiber filter tube erected in the reactor frame body, a pulse ash spraying system installed on the reactor frame body, an ash bucket located below the reactor frame body and communicated with the reactor frame body, and a steel structure support used for supporting the reactor frame body, wherein a vanadium-based catalyst is attached to the ceramic fiber filter tube to decompose dioxin. The dust removal principle of the ceramic fiber filter tube dust removal catalytic device 7 is based on the fact that the ceramic fiber filter tube has a high porosity structure, and the dioxin removal principle is based on a mixing technology of two effective base materials. The ceramic fiber filter tube and a vanadium-based catalyst (catalyst) are used for decomposing and removing dioxin under the action of the catalyst; the flue gas temperature at the outlet of the ceramic fiber filter tube dust removal catalytic device 7 is in the range of 180-220 ℃.
The outlet of the ceramic fiber filter tube dust removal catalytic device 7 is connected with a chimney 9 through a pipeline. The SNCR denitration device comprises an ammonia water temporary storage and conveying system, a compressed air system and an ammonia water injection system. The quenching tower 4 is provided with a double-fluid atomization spray gun. The temperature of the flue gas is rapidly reduced to 250-300 ℃ in the quenching tower 4.
The working principle of the system for recovering the waste heat of the tail gas to stabilize the SNCR denitration efficiency is as follows.
The first step is as follows: after the dangerous waste is burned in the rotary kiln 1, the generated high-temperature flue gas enters a secondary combustion chamber 2 for combustion;
the second step is that: mixing the flue gas combusted in the secondary combustion chamber 2 with return air, and then feeding the mixture into an SNCR (selective non-catalytic reduction) denitration device to remove nitrogen oxides;
the third step: the denitrated flue gas is subjected to heat energy utilization in a waste heat boiler to generate steam;
the fourth step: the flue gas at the outlet of the waste heat boiler enters a quench tower 4 to be rapidly cooled and remove dioxin;
the fifth step: the flue gas from the quenching tower 4 enters a semidry deacidification system 5 to remove acid gases such as hydrogen chloride and the like;
and a sixth step: the flue gas from the semi-dry deacidification system 5 is further desulfurized by a sodium-based desulfurizer sprayed out by a second nozzle;
the seventh step: the flue gas enters a ceramic fiber filter tube dust removal catalytic unit 7, and dioxin and dust are removed in the device. Part of the purified flue gas is taken as backflow air to flow back to the second combustion chamber 2 and the quenching tower 4 (the backflow of the flue gas to the quenching tower 4 can ensure that the system has stable air volume meeting the operation requirement, otherwise, the system operation may be unstable due to insufficient air volume), and part of the purified flue gas is discharged from a chimney 9.
It should be noted that the temperature of the second combustion chamber 2 is controlled between 1100 ℃ and 1200 ℃, and the residence time is more than 2 seconds. The return air is clean flue gas treated by the flue gas treatment system, the temperature is about 180-220 ℃, and the temperature of the mixed flue gas and the return air is stabilized within the range of 850-950 ℃ so as to enter the SNCR denitration device. The SNCR denitration device is arranged at the first section of the waste heat boiler, and a reducing agent is sprayed into the mixed flue gas to remove nitrogen oxides.
According to the system for recovering the waste heat of the tail gas to stabilize the denitration efficiency of the SNCR, the temperature of the clean flue gas after final treatment is about 200 ℃, a part of flue gas is introduced to be used as backflow air, and the flue gas at the outlet of the secondary combustion chamber 2 is mixed with the backflow air to stabilize the temperature of the flue gas entering the SNCR denitration device at 850-950 ℃, so that the waste heat can be recovered, the denitration efficiency of the SNCR denitration device can be stabilized at about 50%, and the escape of ammonia is reduced. In addition, the system has good pollutant removing effect of the flue gas treatment system, and the treated discharged flue gas can adapt to increasingly strict standards.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structural changes made by the contents of the specification and the drawings, or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. The utility model provides a system for tail gas waste heat recovery is with stable SNCR denitration efficiency which characterized in that, includes rotary kiln, second combustion chamber, SNCR denitrification facility, exhaust-heat boiler, quench tower and ceramic fiber filter tube dust removal catalytic unit who loops through pipe connection, wherein, ceramic fiber filter tube dust removal catalytic unit's export is passed through the pipeline and is connected with SNCR denitrification facility's entry.
2. The system for recovering the waste heat of the tail gas to stabilize the SNCR denitration efficiency according to claim 1, wherein a flow control valve and an induced draft fan are further installed on a pipeline between the outlet of the ceramic fiber filter tube dust removal catalytic device and the inlet of the SNCR denitration device; and a temperature measuring device is installed at the inlet of the SNCR denitration device.
3. The system for recovering the waste heat of the tail gas to stabilize the SNCR denitration efficiency according to claim 1, wherein a semidry deacidification system and a cyclone dust collector are sequentially connected to an outlet of the quenching tower, and an outlet of the cyclone dust collector is connected with a ceramic fiber filter tube dedusting catalytic device.
4. The system for recovering waste heat of tail gas to stabilize SNCR denitration efficiency according to claim 3, wherein the semi-dry deacidification system comprises a quenching semi-dry deacidification tower, a quenching water tank and a lime slurry preparation system which are connected with the quenching semi-dry deacidification tower, and a quartz sand circulating device which is positioned at one side of the quenching semi-dry deacidification tower.
5. The system for recovering the waste heat of the tail gas to stabilize the SNCR denitration efficiency as claimed in claim 4, wherein an alkaline agent injection device is further connected to an inlet end of the quenching semi-dry deacidification tower, the cyclone dust collector is connected with the activated carbon adsorption device through a conveying pipe, a circulating storage tank is further installed on a pipeline between the quenching semi-dry deacidification tower and the inlet end of the cyclone dust collector, and sand is contained in the circulating storage tank.
6. The system for recovering the waste heat of the tail gas to stabilize the SNCR denitration efficiency as claimed in claim 4, wherein a first nozzle for spraying a calcium-based desulfurizer is installed on a pipeline at the inlet end of the quenching semi-dry deacidification tower, and a second nozzle for spraying a sodium-based desulfurizer is installed on a pipeline at the outlet end of the quenching semi-dry deacidification tower.
7. The system for recovering the waste heat of the tail gas to stabilize the SNCR denitration efficiency according to claim 1, wherein an outlet of the ceramic fiber filter tube dust removal catalyst device is connected with an inlet of a quenching tower through a pipeline, and a flow control valve is further installed on the pipeline at the inlet end of the quenching tower.
8. The system for recovering waste heat of tail gas to stabilize SNCR denitration efficiency according to claim 1, wherein the ceramic fiber filter tube dust removal catalyst device comprises a reactor frame, a ceramic fiber filter tube erected in the reactor frame, a pulse ash spraying system installed on the reactor frame, an ash bucket positioned below the reactor frame and communicated with the reactor frame, and a steel structure support for supporting the reactor frame, wherein a vanadium-based catalyst is attached to the ceramic fiber filter tube to decompose dioxin.
9. The system for recovering the waste heat of the tail gas to stabilize the SNCR denitration efficiency according to claim 1, wherein an outlet of the ceramic fiber filter tube dust removal catalytic device is connected with a chimney through a pipeline; the SNCR denitration device comprises an ammonia water temporary storage and conveying system, a compressed air system and an ammonia water injection system.
10. The system for recovering the waste heat of the tail gas to stabilize the SNCR denitration efficiency according to any one of claims 1 to 9, wherein the quenching tower is matched with a two-fluid atomization spray gun; the waste heat boiler is a four-section type waste heat boiler, and the SNCR denitration device is arranged in the first section of the waste heat boiler.
CN201921197079.6U 2019-07-26 2019-07-26 System for tail gas waste heat recovery is with stable SNCR denitration efficiency Active CN211069614U (en)

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CN201921197079.6U CN211069614U (en) 2019-07-26 2019-07-26 System for tail gas waste heat recovery is with stable SNCR denitration efficiency

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