CN212029535U - Processing system of low temperature denitration inactivation active carbon material thermal regeneration waste gas - Google Patents
Processing system of low temperature denitration inactivation active carbon material thermal regeneration waste gas Download PDFInfo
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Abstract
The utility model discloses a processing system of hot regeneration waste gas of low temperature denitration inactivation active carbon material. The thermal regeneration waste gas treatment system comprises a boiler system, a flue gas purification system and an induced draft fan which are sequentially communicated; a gas outlet of the induced draft fan is communicated with at least two denitration reactors connected in parallel; at least one denitration reactor is used for regenerating the deactivated activated carbon material and is communicated with the rest denitration reactors; the denitration reactor for regeneration is communicated with the boiler system. The utility model discloses a treatment system of the hot regeneration waste gas of low temperature denitration inactivation active carbon material introduces the regeneration waste gas into an upstream boiler system, and utilizes the flue gas purification system of the boiler to realize the purification treatment of pollutants in the waste gas; NO in the waste gas is oxidized and then absorbed by a calcium-based absorbent, and finally solidified in the coal ash; the regeneration process is simple, the operation cost is low, and the final waste is single in type and convenient to be recycled and treated in a centralized manner.
Description
Technical Field
The utility model relates to an active carbon material thermal regeneration exhaust treatment system, concretely relates to processing system of low temperature denitration inactivation active carbon material thermal regeneration waste gas.
Background
Due to the abundant pore structure and the specific adsorption and catalysis characteristics, activated carbon materials (such as activated carbon, activated coke or activated carbon fiber) have become adsorbents for dry-method low-temperature flue gas denitration. At present, flue gas denitration by using an activated carbon material is a process method with great development prospect. After the carbon material is adsorbed and saturated, the activity of the carbon material can be recovered through regeneration and recycled. Pollutants in waste gas generated by regeneration must be efficiently purified so as to avoid secondary pollution. In the prior art, a low-temperature carbon-based flue gas desulfurization and denitrification combined method is reported, wherein a fixed bed activated carbon material reactor is adopted to perform fine denitrification on low-temperature flue gas containing low-concentration NOx, and downstream hot flue gas is used to perform in-situ thermal regeneration on an inactivated carbon material. At present, no report is available about the thermal regeneration process of the activated carbon material and the regeneration of waste gas.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a processing system of hot regeneration waste gas of low temperature denitration inactivation active carbon material, the utility model discloses a denitration reactor's normal position heat regeneration method to introduce upper reaches boiler system with regeneration waste gas, utilize boiler self gas cleaning system, realize the purification treatment to pollutant in the waste gas.
The activated carbon material of the utility model is the modified material of activated carbon, activated coke, activated semicoke, activated carbon fiber and carbon-based material.
The utility model provides a low-temperature denitration inactivation active carbon material thermal regeneration waste gas treatment system, which comprises a boiler system, a flue gas purification system and a draught fan which are communicated in sequence; a gas outlet of the induced draft fan is communicated with at least two denitration reactors connected in parallel; wherein at least one denitration reactor is used for regenerating the deactivated activated carbon material and is communicated with the rest denitration reactors; the denitration reactor for regeneration is communicated with the boiler system.
Specifically, the flue gas purification system is an oxidation coupling NGD integrated flue gas purification device;
the oxidation coupling NGD integrated flue gas purification device has the following structure:
1) comprises an oxidation flue, an NGD vertical pipe type reactor, a dust remover, a circulating ash bin and a humidifying mixer which are sequentially communicated;
the oxidation flue is communicated with the boiler system, the dust remover is communicated with the induced draft fan, and the humidifying mixer is communicated with the NGD vertical tube type reactor.
The oxidation flue is also communicated with an ozone generation system.
2) Comprises an NGD vertical pipe type reactor, a dust remover, a circulating ash bin and a humidifying mixer which are sequentially communicated;
the NGD vertical tubular reactor is communicated with an oxidant solution storage and delivery device, the dust remover is communicated with the induced draft fan, and the humidifying mixer is communicated with the NGD vertical tubular reactor.
The utility model discloses hot regeneration exhaust treatment system adopts two or more denitration reactor is parallelly connected to be arranged, and denitration and regeneration usefulness are made respectively in the operation of changing, realize continuous denitration. The process for carrying out heat regeneration and waste gas treatment on the inactivated activated carbon material by using the treatment system comprises the following steps: when the activated carbon material of the working reactor (denitration reactor) is saturated in adsorption, the reaction is switched to a regeneration mode through valve switching, part of tail clean hot flue gas is heated and then introduced into the regeneration reactor (denitration reactor), the inactivated activated carbon material is heated to a target temperature, NOx and CO pollutant gases are released, and the NOx is mainly NO. Introducing the hot regenerated waste gas into a combustion mechanism (a combustor or a hearth), and after the hot regenerated waste gas is uniformly mixed with boiler flue gas, diluting the concentrations of NOx and CO pollutants by times; under the reducing atmosphere and a proper temperature window, part of CO in the regenerated waste gas plays the role of a denitration reducing agent, and most of CO generates CO after being combusted2(ii) a Then, the flue gas (100-160 ℃) at the outlet of the boiler is oxidized by a strong oxidant, wherein NO is oxidized into NO with higher reaction activity2Then enters the NGD reactor to reduce the temperature and humidity, and NO is generated2And the NO in the regenerated waste gas is finally solidified in the coal ash and is subsequently recycled and treated along with the ash as solid waste. And after the low-temperature flue gas treated by the NGD enters an activated carbon denitration device for deep denitration, the clean flue gas is discharged into the atmosphere.
In order to control the release speed and concentration of pollutants, a temperature control mode of temperature programming is adopted within the temperature range of 100-400 ℃, a plurality of constant temperature platforms are arranged, NOx in the inactivated carbon material is slowly released, and the condition that the NOx emission exceeds the standard due to the fact that a large amount of NOx is intensively released and an upstream denitration device runs in an overload mode during thermal regeneration is avoided.
When the treatment system of the utility model is adopted to treat the heat regeneration waste gas, the volume oxygen content in the tail low-oxygen clean smoke is less than 10 percent;
the conditions for regeneration were as follows:
the regeneration temperature is less than 400 ℃ (excluding 400 ℃), preferably 100-400 ℃, and more preferably 150-350 ℃;
the airspeed of the tail low-oxygen clean flue gas is less than 1000h-1；
Controlling the amount of the regenerated waste gas to be less than 60% of the amount of the flue gas treated by the flue gas purification system;
the concentration of NOx in the regeneration waste gas is less than 2000mg/m3CO concentration < 5000mg/m3。
Experiments show that NOx in the waste gas is mainly NO and only a very small amount of NO is in the waste gas during the thermal regeneration of the denitration inactivation activated carbon material2. In addition, by adopting the low-oxygen thermal regeneration process, the upper part C of the activated carbon material is converted into CO to be released, and the higher the temperature is, the higher the CO release concentration is, namely, the more carbon loss of the carbon material is. At the regeneration temperature of 400 ℃, most of NOx adsorbed on the carbon material can be released, and in order to reduce carbon loss, the regeneration temperature is controlled not to exceed 400 ℃.
And conveying the purified regeneration waste gas to denitration reactors connected in parallel after purification, so as to realize treatment of the regeneration waste gas.
The utility model discloses owing to take above technical scheme, have following advantage:
1. the utility model discloses a treatment system of the hot regeneration waste gas of low temperature denitration inactivation active carbon material introduces the regeneration waste gas into an upstream boiler system, and utilizes the flue gas purification system of the boiler to realize the purification treatment of pollutants in the waste gas; NO in the waste gas is oxidized and then absorbed by a calcium-based absorbent, and finally solidified in the coal ash; the regeneration process is simple, the operation cost is low, and the final waste is single in type and convenient to be recycled and treated in a centralized manner.
2. The utility model discloses processing system of low temperature denitration inactivation active carbon material thermal regeneration waste gas adopts programming temperature's accuse temperature mode, establishes a plurality of constant temperature platforms for the NOx that produces during the regeneration obtains slow release, because NOx concentrates the release in a large number during avoiding thermal regeneration, and upper reaches denitrification facility overload operation causes export NOx to discharge and exceeds standard.
3. The utility model discloses the processing system of the hot regeneration waste gas of low temperature denitration inactivation active carbon material adopts the hot regeneration technology of normal position of denitration reactor, avoids removing the mechanical loss of active carbon material in the regeneration technology, extension charcoal material life.
Drawings
Fig. 1 is the structure schematic diagram of the thermal regeneration waste gas treatment system for the low-temperature denitration inactivation activated carbon material.
Fig. 2 is a schematic structural diagram of an ozone oxidation flue gas purification device.
Fig. 3 is a schematic structural diagram of a liquid oxidant oxidation flue gas purification device.
The respective symbols in the figure are as follows:
1 denitration reactor (regeneration/work), 1-1 regeneration gas outlet valve, 1-2 reactor inlet valve, 1-3 reactor outlet valve, 1-4 regeneration gas inlet valve, 2 induced draft fan, 3 oxidation coupling NGD integrated flue gas purification device, 4 boiler combustion mechanism, 2 induced draft fan, 3-1 oxidation flue, 3-2NGD vertical tube type reactor, 3-3 cloth bag dust remover, 3-4 circulation ash bin, 3-5 feed valve, 3-6 humidifying mixer, 3-7 ozone generating and feeding device, 3-8 oxidant solution storing and feeding device.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
As shown in fig. 1, for the utility model provides a hot regeneration exhaust treatment system's of low temperature denitration inactivation active carbon material structure schematic diagram, including boiler combustion mechanism 4 that communicates in proper order, oxidation coupling NGD integration flue gas purification device 3 and draught fan 2, wherein, draught fan 2's air outlet and parallelly connected 2 denitration reactor 1 (only show one) intercommunication, every denitration reactor 1 all is equipped with clean exhanst gas outlet, and 2 denitration reactor 1 are linked together, a denitration reactor 1 and boiler combustion mechanism 4 for regeneration are linked together, a regeneration flue gas for producing with regenerating is sent back to in the boiler combustion mechanism 4 of upper reaches, then carry out purification treatment through oxidation coupling NGD integration flue gas purification device 3, then in the denitration reactor 1 of entering work.
In the embodiment, a structural schematic diagram of an oxidation coupling NGD integrated flue gas purification device 3 is shown in fig. 2, and comprises an oxidation flue 3-1, an NGD vertical tube type reactor 3-2, a bag-type dust collector 3-3, a circulating ash bin 3-4, a feeding valve 3-5 and a humidifying mixer 3-6 which are sequentially communicated, wherein the oxidation flue 3-1 is communicated with a boiler combustion mechanism 4, the bag-type dust collector 3-3 is communicated with an induced draft fan 2, the humidifying mixer 3-6 is communicated with the NGD vertical tube type reactor 3-2, and an ozone oxidant is generated by an ozone generating and adding device 3-7 and is conveyed to the oxidation flue 3-1. The flue gas purified by the oxidation coupling NGD integrated flue gas purification device 3 is introduced into the denitration reactor 1 through the induced draft fan 2.
In this embodiment, a schematic structural diagram of the oxidation-coupling NGD integrated flue gas purification device 3 is shown in fig. 3, and includes an NGD vertical pipe type reactor 3-2, a bag-type dust collector 3-3, a circulating ash bin 3-4, a feed valve 3-5, and a humidifying mixer 3-6, which are sequentially communicated, wherein the NGD vertical pipe type reactor 3-2 is communicated with a boiler combustion mechanism 4, the bag-type dust collector 3-3 is communicated with an induced draft fan 2, the humidifying mixer 3-6 is communicated with the NGD vertical pipe type reactor 3-2, and an oxidant is input into the NGD vertical pipe type reactor 3-2 through an oxidant solution storage and delivery device 3-8. The flue gas purified by the oxidation coupling NGD integrated flue gas purification device 3 is introduced into the denitration reactor 1 through the induced draft fan 2.
Utilize the utility model discloses technology when low temperature denitration inactivation active carbon material heat regeneration exhaust treatment system carries out active carbon material regeneration and regeneration exhaust treatment as follows:
when the denitration reactor 1 enters a regeneration mode, the inlet and outlet valves 1-2 and 1-3 of the reactor are closed, the inlet and outlet valves 1-4 and 1-1 of the regeneration gas are opened, and the pollutant gas generated by the carbon material is carried out of the denitration reactor (regeneration) 1 by the regeneration heat mediumAnd then the flue gas is sent back to an upstream boiler combustion mechanism (a combustor or a hearth) 4, and after being uniformly mixed with the boiler flue gas, the concentration of NOx and CO pollutants is diluted by times; under the reducing atmosphere and a proper temperature window, part of CO in the regenerated waste gas plays the role of a denitration reducing agent, and most of CO generates CO after being combusted2(ii) a Then, the flue gas (100-160 ℃) at the outlet of the boiler enters an oxidation flue 3-1 and is oxidized by a strong oxidant (gas or liquid oxidant such as O can be adopted)3Sodium chlorate solution, sodium chlorite solution, H2O2Solution, etc.), NO in the flue gas is oxidized into higher-order NOx with higher reactivity; then enters an NGD vertical tubular reactor 3-2, and high-order NO is generated in a cooling and humid environmentx、SO2And (2) reacting the acidic gas with a calcium-based absorbent to generate calcium salt to remove the calcium salt, introducing the desulfurized and denitrated flue gas into a downstream denitration reactor (working) through a draught fan 2 after dust is removed by a bag-type dust remover 3-3, introducing ash collected by the bag-type dust remover 3-3 into a circulating ash bin 3-4, quantitatively feeding part of circulating ash into the NGD vertical tube reactor 3-2 again through a feeding valve 3-5 and a humidifying mixer 3-6 to participate in reaction, and discharging redundant ash. NO in the regenerated waste gas is finally solidified in the coal ash and is subsequently recycled along with the ash as solid waste.
The utility model discloses the influence of regeneration temperature to the release of pollutant in the regeneration process inactivation carbon material has been investigated, and the result is shown as figure 4, can see that regeneration temperature plays decisive action to pollutant release in the inactivation carbon material, and at 400 ℃ within range, the vast majority of adsorbed NOx has released.
Therefore, in order to control the release speed and concentration of pollutants, a temperature control mode of temperature programming is adopted within the temperature range of 100-400 ℃, preferably 150-350 ℃, a plurality of constant temperature platforms are arranged, NOx in the inactivated carbon material is slowly released, and the condition that the NOx emission exceeds the standard due to the fact that a large amount of NOx is intensively released and an upstream denitration device runs in an overload mode during thermal regeneration is avoided.
Under the regeneration temperature of 100-400 ℃, the following conditions are controlled: the oxygen content in the tail gas is less than 10 percent, and the space velocity of the regenerated waste gas is less than 1000h-1The amount of the regenerated waste gas is controlled to be less than 60 percent of the amount of the flue gas treated by the flue gas purification system, and the concentration of NOx in the regenerated waste gas is less than 2000mg/m3CO concentration < 5000mg/m3And the purification treatment of the regenerated waste gas can be effectively realized.
The following technical effects under thermal regeneration conditions were examined:
the thermal regeneration process conditions are as follows: the oxygen content of the regenerated hot flue gas is 6 percent, the regeneration temperature is 300 ℃, and the regeneration space velocity is 500h-1The concentration of NOx in the regenerated flue gas is less than 1000mg/m3CO concentration < 2000mg/m3。
In the thermal regeneration waste gas treatment system shown in figure 1, the regeneration waste gas is uniformly mixed with the boiler flue gas, and part of NO is reduced into N by CO in a high-temperature reducing atmosphere2Removing it, burning most of CO in regenerated gas to generate CO2(ii) a NOx concentration at inlet of NO denitration reactor at inlet of oxidation coupling NGD flue gas integrated purification device is less than 500mg/m3CO concentration < 50mg/m3And the NOx at the NGD outlet is less than 100mg/m after oxidation and denitration3(ii) a The low-temperature flue gas enters an active coke denitration reactor for fine denitration, the reaction temperature is 70 ℃, and the airspeed is 1000h-1The concentration of NOx at the outlet of the denitration reactor is less than 50mg/m3(ii) a The total denitration rate is 90 percent.
Claims (4)
1. A treatment system for thermally regenerating waste gas by using a low-temperature denitration inactivated activated carbon material comprises a boiler system, a flue gas purification system and an induced draft fan which are sequentially communicated; a gas outlet of the induced draft fan is communicated with at least two denitration reactors connected in parallel; the method is characterized in that:
at least one denitration reactor is used for regenerating the deactivated activated carbon material and is communicated with the rest denitration reactors; the denitration reactor for regeneration is communicated with the boiler system.
2. The processing system of claim 1, wherein: the flue gas purification system is an oxidation coupling NGD integrated flue gas purification device.
3. The processing system of claim 2, wherein: the oxidation coupling NGD integrated flue gas purification device comprises an oxidation flue, an NGD vertical tube type reactor, a dust remover, a circulating ash bin and a humidifying mixer which are sequentially communicated;
the oxidation flue is communicated with the boiler system, the dust remover is communicated with the induced draft fan, and the humidifying mixer is communicated with the NGD vertical pipe type reactor;
the oxidation flue is also communicated with an ozone generation system.
4. The processing system of claim 2, wherein: the oxidation coupling NGD integrated flue gas purification device comprises an NGD vertical tube type reactor, a dust remover, a circulating ash bin and a humidifying mixer which are sequentially communicated;
the NGD vertical tubular reactor is communicated with an oxidant solution storage and delivery device, the dust remover is communicated with the induced draft fan, and the humidifying mixer is communicated with the NGD vertical tubular reactor.
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| CN112903560A (en) * | 2021-01-21 | 2021-06-04 | 北京博旺源科技有限公司 | Method for detecting nitrite releasing performance of activated carbon |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112903560A (en) * | 2021-01-21 | 2021-06-04 | 北京博旺源科技有限公司 | Method for detecting nitrite releasing performance of activated carbon |
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Address after: 100013 No. 5 Youth Road, Chaoyang District, Beijing, Hepingli Patentee after: Beijing Tiandi Sunac Technology Co.,Ltd. Address before: 100013 No. 5 Youth Road, Chaoyang District, Beijing, Hepingli Patentee before: CHINA COAL RESEARCH INSTITUTE (CCRI) ENERGY SAVING TECHNOLOGY CO.,LTD. |