CN209865775U - Denitration device for activated carbon fixed bed - Google Patents
Denitration device for activated carbon fixed bed Download PDFInfo
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- CN209865775U CN209865775U CN201920662923.1U CN201920662923U CN209865775U CN 209865775 U CN209865775 U CN 209865775U CN 201920662923 U CN201920662923 U CN 201920662923U CN 209865775 U CN209865775 U CN 209865775U
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Abstract
The utility model discloses an active carbon fixed bed denitrification facility, including the reactor main part, its both ends are equipped with inlet channel and exit channel respectively, and the inside of reactor main part is equipped with a plurality of active carbon adsorption layers, is equipped with in the reactor main part: the flue gas channel, the cavity of the reactor main body and the purified flue gas channel are communicated to form a denitration channel; the regeneration flue gas channel, the cavity of the reactor main body and the sulfur-rich flue gas channel are communicated to form a desulfurization channel; the steam channel, the cavity of the reactor main body and the steam diffusing channel are communicated to form a cooling channel. The utility model discloses, reactor main part simple structure can realize accomplishing the denitration reaction under the low temperature, does not need extra low temperature catalyst, reduces equipment and catalyst cost, and the denitration process is simple, and the flow in the reactor main part is close the plug flow, can not produce the back mixing phenomenon, and the denitration is efficient, and the fixed setting of active carbon adsorption layer need not provide extra power, and energy loss is little, and can not cause the pollution to the environment.
Description
Technical Field
The utility model relates to a nitrogenous industrial waste gas pollution treatment technical field, concretely relates to active carbon fixed bed denitrification facility.
Background
The flue gas denitration technology is a flue gas purification technology applied to the industrial fields of electric power, cement, boilers and the like generated by multi-nitrogen oxides. The existing denitration technology mainly comprises the following steps: SCR denitration technology, low-temperature SCR denitration technology, wet denitration technology, activated carbon moving bed denitration technology and the like.
The denitration device that traditional SCR denitration technique adopted is comparatively complicated, and is required for the denitration environment higher, to low temperature flue gas, before the denitration, need heat low temperature flue gas to 350 ℃ -400 ℃ through extra heater, just can accomplish the denitration reaction in the effect of catalyst, has serious energy waste to and the waste of equipment cost. The low-temperature SCR denitration technology needs to be provided with a special low-temperature catalyst, and the cost is higher. For a wet denitration technology, the problems of low denitration efficiency, high investment and operation cost, nitrate pollution and the like generally exist. The denitration technology of the activated carbon moving bed needs to separately arrange a transfer and regeneration device, and has the advantages of more operation equipment, large investment and high operation cost.
In view of this, there is an urgent need to improve the existing denitration apparatus, simplify the structure of the denitration apparatus, reduce the equipment cost, increase the denitration efficiency, reduce the energy consumption and reduce the environmental pollution.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that current denitration device has the problem that the structure is complicated, low temperature nitrogenous flue gas denitration is with high costs, denitration efficiency is low, energy consumption is great, cause the pollution to the environment easily.
In order to solve the technical problem, the utility model provides an active carbon fixed bed denitrification facility, including the reactor main part that is the tubbiness, the both ends of reactor main part are equipped with access way and exit channel respectively, the inside interval of reactor main part is equipped with a plurality of active carbon adsorption layers, be equipped with in the reactor main part:
the flue gas channel and the purified flue gas channel are respectively communicated with the inlet channel and the outlet channel, and the flue gas channel, the cavity of the reactor main body and the purified flue gas channel are communicated to form a denitration channel;
the regeneration flue gas channel and the sulfur-rich flue gas channel are respectively communicated with the inlet channel and the outlet channel, and the regeneration flue gas channel, the cavity of the reactor main body and the sulfur-rich flue gas channel are communicated to form a desulfurization channel;
the interval sets up a plurality of steam passage on the lateral wall of reactor main part, steam passage with active carbon adsorption layer one-to-one, and set up active carbon adsorption layer's bottom, exit channel intercommunication has the steam to diffuse the passageway, steam passage, reactor main part the cavity and the steam diffuses the passageway intercommunication and form the cooling passageway.
In the above scheme, flue gas after the flue gas passageway can supply the desulfurization gets into, and its inside flue gas inflow direction of orientation is equipped with flue gas inlet valve, ammonia injection grid and blender in proper order, be equipped with clean flue gas emission valve on the purification flue gas passageway.
In the scheme, the regeneration flue gas channel is provided with a regeneration flue gas inlet valve, and the sulfur-rich flue gas channel is provided with a sulfur-rich flue gas discharge valve.
In the above scheme, each steam channel is provided with a steam inlet valve, one end of each steam channel is communicated with the steam pipeline, and the steam diffusing channel is provided with a steam diffusing valve.
In the above scheme, the outlet channel is provided with the flue gas on-line monitor.
In the scheme, the activated carbon adsorption layer adopts activated coke or honeycomb activated carbon.
In the scheme, the active coke and the honeycomb active carbon both adopt a modular structure.
Compared with the prior art, the utility model discloses reactor main part simple structure utilizes the absorption of active carbon and catalytic action can accomplish the denitration reaction of the nitrogenous flue gas of low temperature, reduces equipment cost and catalyst cost, and the denitration process is simple, and the flow in the reactor main part is close the plug flow, can not produce the back mixing phenomenon, and the denitration is efficient, and the fixed setting of active carbon adsorption layer need not provide extra power, and energy loss is little, and can not cause the pollution to the environment.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The utility model provides a pair of active carbon fixed bed denitrification facility effectively reduces low temperature nitrogenous flue gas denitration equipment cost and catalyst cost, has the advantage that the denitration is efficient, energy loss is little, and can not cause the pollution to the environment simultaneously. The invention is described in detail below with reference to the drawings and the detailed description.
As shown in fig. 1, the utility model provides a pair of activated carbon fixed bed denitrification facility is including being tubbiness reactor main part 10, and reactor main part 10's both ends are equipped with inlet channel 11 and exit channel 12 respectively, and reactor main part 10's inside is equipped with a plurality of activated carbon adsorption layers 13 along its direction of height interval.
The inlet channel 11 and the outlet channel 12 are respectively communicated with a flue gas channel 20 and a purified flue gas channel 30, and the flue gas channel 20, the cavity of the reactor main body 10 and the purified flue gas channel 30 are communicated to form a denitration channel.
Further optimally, the flue gas channel 20 can be used for the desulfurized flue gas to enter, a flue gas inlet valve 21, an ammonia injection grid 22 and a mixer 23 are sequentially arranged in the flue gas channel towards the flue gas inflow direction, and a purified flue gas discharge valve 31 is arranged on the purified flue gas channel 30.
The flue gas inlet valve 21 and the clean flue gas discharge valve 31 control the circulation of gas, the ammonia injection grid 22 is used for injecting ammonia gas into the flue gas channel 20, nozzles for uniformly injecting ammonia gas are arranged on the ammonia injection grid 22, the injected ammonia gas and the desulfurized sintering (pelletizing) flue gas enter the mixer 23 to be uniformly mixed, and then enter the cavity of the reactor main body 10 for denitration. The ammonia gas can be from ammonia, urea and liquid ammonia, and it is necessary to ensure that the concentration of ammonia gas entering the ammonia injection grid 22 is 5%.
The inlet channel 11 and the outlet channel 12 are respectively communicated with a regeneration flue gas channel 40 and a sulfur-rich flue gas channel 50, and the regeneration flue gas channel 40, the cavity of the reactor main body 10 and the sulfur-rich flue gas channel 50 are communicated to form a desulfurization channel.
Further optimally, a regeneration flue gas inlet valve 41 is arranged on the regeneration flue gas channel 40, and a sulfur-rich flue gas discharge valve 51 is arranged on the sulfur-rich flue gas channel 50. The regeneration flue gas inlet valve 41 and the sulfur-rich flue gas discharge valve 51 are used for controlling the circulation of gas.
The regeneration flue gas adopts hot air at 120 ℃ or hot steam/nitrogen at 350 ℃ of 200-. The sulfur-rich flue gas generated by desorption and regeneration is discharged through the sulfur-rich flue gas channel 50 and returns to the previous process for desulfurization.
When the activated carbon adsorption layer 13 needs desorption regeneration, ammonia gas is stopped from entering the ammonia injection grid 22, the flue gas inlet valve 21 is closed, the regeneration flue gas inlet valve 41 is opened, and desorption regeneration of the activated carbon adsorption layer 13 is started. And after the desorption and regeneration of one set of the activated carbon fixed bed denitration device is finished, the next set is carried out, the desorption and regeneration are carried out circularly, the continuous operation of denitration reaction is not influenced, and the working efficiency is increased.
The side wall of the reactor main body 10 is provided with a plurality of steam channels 60 at intervals, the steam channels 60 correspond to the activated carbon adsorption layers 13 one by one and are arranged at the bottom of the activated carbon adsorption layers 13, the outlet channel 12 is communicated with a steam diffusing channel 70, and the steam channels 60, the cavity of the reactor main body 10 and the steam diffusing channel 70 are communicated to form a cooling channel.
Further optimally, each steam channel 60 is provided with a steam inlet valve 61, one end of each steam inlet valve is communicated with the steam pipeline 80, and the steam diffusing channel 70 is provided with a steam diffusing valve 71. Is used for activating the activated carbon adsorption layer 13 and cooling and spraying in case of accident. When necessary, the steam inlet valve 61 and the steam release valve 71 are opened, and the other valves are closed, so that the steam enters the reactor main body 10 through the steam pipe 80 and the steam passage 60, passes through the activated carbon adsorption layer 13, and then flows out of the steam release passage 70.
The utility model discloses a be equipped with flue gas on-line monitoring appearance 14 on exit channel 12. After the adsorption catalytic reaction is carried out to a certain degree, the activated carbon adsorption layer 13 needs to be desorbed and regenerated due to the existence of a small amount of sulfur in the sintering flue gas. The regeneration frequency can be determined by the monitoring value of the flue gas on-line monitor, and the air pollution is avoided.
Further optimally, the activated carbon adsorption layer 13 adopts activated coke or honeycomb activated carbon, and has the advantages of high strength and low resistance. And the active coke and the honeycomb active carbon both adopt modular structures, so that the installation and the replacement are convenient.
The utility model has the advantages of it is following:
(1) activated carbon fixed bed denitrification facility is strong to flue gas operating mode adaptation, can be according to the parallelly connected use of sintering flue gas operating mode condition multiunit, can set up multilayer activated carbon adsorption layer 13 again as required in every set of fixed bed denitrification facility, and wherein, at least one set is used for desorption regeneration, and all the other are used for adsorbing the catalysis, increase work efficiency.
(2) The denitration device has no complicated mechanical structure of the traditional moving bed, simple structure and small initial investment. Similar to the existing SCR reactor, the catalytic denitration reaction is carried out in the presence of ammonia by utilizing the adsorption and catalysis effects of activated carbon;
(3) the adsorption catalysis and desorption regeneration of the activated carbon adsorption layer 13 are carried out in the reactor main body 10, the activated carbon adsorption layer 13 does not need to be repeatedly assembled, disassembled and transported, and the mechanical loss of the activated carbon adsorption layer 13 in the transportation and regeneration processes is reduced;
(4) the power for fluidizing the activated carbon particles is not required to be provided, and the energy consumption is low;
(5) the flow in the fixed bed reactor is close to plug flow, the back mixing phenomenon can not be generated, and the reaction efficiency is higher;
(6) the whole operation equipment is less, and the investment and the operation cost are low;
(7) can simultaneously remove various harmful substances in the smoke, including dioxin, Hg, HF and the like, and really realize advanced treatment;
(8) can simultaneously remove SO which is difficult to remove by wet desulphurization3，SO3The removal rate is high;
(9) if the desulfurization is combined with the semi-dry desulfurization, the desulfurization is carried out firstly and then the denitration is carried out, so that the defect of low desulfurization efficiency of the semi-dry desulfurization can be overcome, and meanwhile, the whitening treatment is not required;
(10) if combined with semi-dry desulfurization/wet desulfurization, first desulfurization and then denitrification, SO in flue gas2The concentration is low, the regeneration times of the activated carbon adsorption layer 13 are few, the chemical loss in the regeneration process is few, the activated carbon adsorption layer can be periodically regenerated according to online monitoring data, the service life of the activated carbon is prolonged, and the denitration cost is reduced.
The present invention is not limited to the above-mentioned best mode, and any person should learn the structural change made under the teaching of the present invention, all with the present invention has the same or similar technical solution, all fall into the protection scope of the present invention.
Claims (7)
1. The utility model provides an active carbon fixed bed denitrification facility, is including the reactor main part that is the tubbiness, the both ends of reactor main part are equipped with inlet channel and exit channel respectively, a serial communication port, the inside interval of reactor main part is equipped with a plurality of active carbon adsorption layers, be equipped with in the reactor main part:
the flue gas channel and the purified flue gas channel are respectively communicated with the inlet channel and the outlet channel, and the flue gas channel, the cavity of the reactor main body and the purified flue gas channel are communicated to form a denitration channel;
the regeneration flue gas channel and the sulfur-rich flue gas channel are respectively communicated with the inlet channel and the outlet channel, and the regeneration flue gas channel, the cavity of the reactor main body and the sulfur-rich flue gas channel are communicated to form a desulfurization channel;
the interval sets up a plurality of steam passage on the lateral wall of reactor main part, steam passage with active carbon adsorption layer one-to-one, and set up active carbon adsorption layer's bottom, exit channel intercommunication has the steam to diffuse the passageway, steam passage, reactor main part the cavity and the steam diffuses the passageway intercommunication and form the cooling passageway.
2. The activated carbon fixed bed denitration device of claim 1, wherein the flue gas channel is used for the entry of desulfurized flue gas, and is internally provided with a flue gas inlet valve, an ammonia injection grid and a mixer in sequence towards the flue gas inflow direction, and the purified flue gas channel is provided with a purified flue gas discharge valve.
3. The activated carbon fixed bed denitration device of claim 1, wherein a regeneration flue gas inlet valve is arranged on the regeneration flue gas channel, and a sulfur-rich flue gas discharge valve is arranged on the sulfur-rich flue gas channel.
4. The activated carbon fixed bed denitration device of claim 1, wherein each steam channel is provided with a steam inlet valve, one end of each steam channel is communicated with a steam pipeline, and the steam diffusion channel is provided with a steam diffusion valve.
5. The activated carbon fixed bed denitration device of claim 1, wherein an online flue gas monitor is arranged on the outlet channel.
6. The denitration device of the activated carbon fixed bed according to claim 1, wherein the activated carbon adsorption layer is activated coke or honeycomb activated carbon.
7. The activated carbon fixed bed denitration device according to claim 6, wherein the activated coke and the honeycomb activated carbon are of a modular structure.
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| CN201920662923.1U CN209865775U (en) | 2019-05-09 | 2019-05-09 | Denitration device for activated carbon fixed bed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111939757A (en) * | 2020-08-10 | 2020-11-17 | 暨南大学 | Method for removing nitrogen oxides in low-temperature flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111939757A (en) * | 2020-08-10 | 2020-11-17 | 暨南大学 | Method for removing nitrogen oxides in low-temperature flue gas |
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