CN219002558U - Desulfurization and denitrification integrated treatment system - Google Patents
Desulfurization and denitrification integrated treatment system Download PDFInfo
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- CN219002558U CN219002558U CN202320033490.XU CN202320033490U CN219002558U CN 219002558 U CN219002558 U CN 219002558U CN 202320033490 U CN202320033490 U CN 202320033490U CN 219002558 U CN219002558 U CN 219002558U
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Abstract
The utility model relates to the technical field of desulfurization and denitrification, in particular to a desulfurization and denitrification integrated treatment system which comprises a flue gas inlet module, a desulfurization and denitrification oxidation module and an absorption tower, wherein the flue gas inlet module and the absorption tower are respectively internally provided with a sequential oxidation process. The utility model aims to perform denitration, desulfurization and oxidation on the flue gas before the flue gas enters the absorption tower, and then perform integrated desulfurization and denitration treatment in the absorption tower, and a two-stage oxidation mechanism is formed through sectional cooperative use, so that the denitration efficiency and stability of the system are improved, and the operation cost of denitration is reduced.
Description
Technical Field
The utility model relates to the technical field of desulfurization and denitrification, in particular to a desulfurization and denitrification integrated treatment system.
Background
For desulfurization and denitration of gas, wet desulfurization technology and selective catalytic reduction denitration technology (SCR) using ammonia as a reducing agent are widely used in industry at present, and the main technology is to desulfurize the gas and then denitrate the gas to obtain clean product gas or to denitrate the gas and then desulfurize the gas to obtain clean product gas. The traditional desulfurization and denitrification process needs independent desulfurization and denitrification units, equipment configuration is complex, larger installation space is needed, repeated configuration of equipment can be effectively reduced by the gas desulfurization and denitrification integrated equipment, space and cost are reduced, and the method has a good application prospect.
However, in the prior art, the effect of desulfurization and denitrification is not ideal because the flue gas always flows in the oxidation process in the desulfurization and denitrification technology.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model aims to perform denitration, desulfurization and oxidation on the flue gas before the flue gas enters the absorption tower, and then perform integrated desulfurization and denitration treatment inside the absorption tower, and form a two-stage oxidation mechanism through sectional cooperative use, so that the denitration efficiency and stability of the system are improved, and the operation cost of denitration is reduced.
The technical aim of the utility model is realized by the following technical scheme: an integrated desulfurization and denitrification treatment system comprises,
the flue gas inlet module comprises a rotary kiln flue gas and/or tunnel kiln flue gas inlet device, the rotary kiln flue gas device comprises a bag-type dust remover and a rotary kiln induced draft fan, a control valve for controlling the flow of the rotary kiln flue gas is arranged between the bag-type dust remover and the rotary kiln induced draft fan, and the tunnel kiln flue gas device comprises a tunnel kiln induced draft fan for drawing the movement of the tunnel kiln flue gas;
the desulfurization, denitrification and oxidation module comprises a desulfurization, denitrification and oxidation agent storage device, a desulfurization, denitrification and oxidation pump and a desulfurization, denitrification and oxidation device communicated with a tunnel kiln induced draft fan and/or a tunnel kiln induced draft fan, wherein a first-stage desulfurization, denitrification and oxidation device inlet is provided with a first-stage desulfurization, denitrification and solution injection device, and the purpose is to complete a partial pre-oxidation function before flue gas enters an absorption tower, and to convert NO into NO by a denitrification agent sodium chlorite mixed solution 3 + Ions, SO 2 And SO 3 Conversion to SO 3 2- And SO 4 2- Ions;
the absorption tower comprises an absorption reaction zone, a circulating oxidation zone and a flue gas demisting zone, a second-stage denitration solution injection device is arranged between the absorption reaction zone and the circulating oxidation zone and used for further improving oxidation efficiency, and the absorption reaction zone is used for injecting residual SO (sulfur dioxide) 2 And SO 3 Is absorbed and dissolved into HSO by water in slurry 3 + And HSO 4 - Ions are further ionized into SO 3 2- And SO 4 2- Ions, then with Ca in lime slurry 2+ Ion reaction to form sulfate and sulfite, NO 3 + Ions and Ca 2+ The ionic reaction generates nitrate, and the circulating oxidation zone is used for completing oxidation and crystallization of desulfurization byproducts and denitration byproducts.
Preferably, the absorption reaction zone comprises a disturbance pump, a gypsum discharge port, a circulating pump inlet, a lime slaking solution inlet, an oxidation fan inlet and an absorption tower inlet flue communicated with the denitration oxidation device, wherein the disturbance pump, the gypsum discharge port, the circulating pump inlet, the lime slaking solution inlet and the absorption tower inlet flue are formed in a loop at the bottom of the absorption tower, the circulating oxidation zone is a spray layer provided with a plurality of nozzles, and the flue gas defogging zone is a three-stage dedusting demister and a clear water spraying device.
Further preferably, the purpose of the disturbing pump is that the disturbing pump circulates slurry at the bottom of the absorption tower, so that dead angles and deposition in the absorption tower are effectively avoided, an oxidation fan inlet is communicated with an oxidation fan and is used for providing oxidation air required by forced oxidation of reaction products, and the oxidation fan is a Roots blower.
Further preferably, the gypsum discharge port is sequentially communicated with a gypsum discharge pump and a cyclone, gypsum at the lower layer of the cyclone is prepared and stored or discharged after passing through a vacuum filter, and filtrate at the upper layer of the cyclone enters a filtrate pool for storage.
Further preferably, the inlet of the circulating pump is sequentially communicated with four circulating pumps, so that slurry is pumped to four spraying layers, sprayed by the nozzles, and atomized liquid drops with fine particles and high reactivity are formed.
Further preferably, the lime slaking solution inlet is sequentially communicated with a lime slaking solution pump and a lime slaking device with a stirrer arranged inside, the lime slaking device is communicated with a lime storage tank, and the lime slaking device is communicated with a filtrate tank through a filtrate pump, so that the purpose of the lime slaking solution is to directly prepare the lime slaking solution by utilizing filtrate in the filtrate tank.
Further preferably, a clear water injection device is arranged in the flue at the inlet of the absorption tower to pre-spray and cool the flue gas, so that the temperature stability of the flue gas at the inlet of the spray tower and the safety of equipment in the tower are ensured.
Further preferably, the three-stage dust removal demister is sequentially provided with two plate type dust removal demisters and a tube bundle dust removal demister from bottom to top.
Further preferably, a layer of clear water spraying device is arranged above and below the tube bundle dust removal demister, and a layer of clear water spraying device is arranged below the plate type dust removal demister.
The principle of the present utility model is that,
first, the mixed solution of sodium chlorite for NO and SO 2 The reaction equation for performing oxidation is as follows:
4NO+3R-NaClO 2 (Living) +2H 2 O＝4HNO 3 +3NaCl reaction type (1)
SO 2 +R-NaClO 2 (Living) +2H 2 O＝2H 2 SO 4 +nacl equation (2);
second, water molecules and SO 2 And SO 3 Removing residual sulfur ions, and reactingThe program is as follows:
SO 2 +H 2 O＝HSO 3 - +H + reactive (3)
SO 3 +H 2 O＝HSO 4 A reaction formula (4);
finally, nitric acid and sulfuric acid solutions are screened with lime (stone) or (alkali) as absorbents to form calcium sulfate and calcium carbonate, the reaction equations of which are as follows:
CaOH+HNO 3 ＝CaNO 3 +H 2 o reaction type (5)
H 2 SO 4 +2CaOH＝Ca 2 SO 4 +2H 2 O-reactive formula (6);
the reaction formula (1) and the reaction formula (2) respectively perform two-stage reaction at the inlet of the desulfurization and denitrification oxidation device and the inside of the absorption tower to form a two-stage oxidation mechanism, so that the denitrification efficiency and stability of the system are improved, the operation cost of denitrification is reduced, and the discharged flue gas is ensured to meet the emission standard.
The utility model has the following beneficial effects:
the absorption reaction zone, the circulating oxidation zone and the flue gas demisting zone are sequentially arranged downwards and upwards and are matched with the flow direction of flue gas in the absorption tower;
and the second stage of demister is arranged on the absorption tower and is arranged at the upper part of the circulating oxidation zone of the absorption tower, and the smoke passes through the circulating oxidation zone and then continuously flows through the two stages of demister to remove the mist drops of the contained slurry. The upper and lower parts of the tube bundle dust-removing demister are respectively provided with a layer of clear water spraying device, the cleaning water is sprayed to the tube bundle dust-removing demister from the clear water spraying device in a strong mode, solid particles on the forward flow surface and the reverse flow surface of the tube bundle dust-removing demister are taken away, and a layer of clear water spraying device is also arranged below the secondary demister. After the flue gas passes through two-stage demisting, the content of water drops carried by the flue gas is lower than 75mg/Nm 3 (dry basis);
drawings
FIG. 1 is a schematic diagram of the overall process of the present utility model;
FIG. 2 is a partial view of a flue gas inlet module;
FIG. 3 is a partial view of a desulfurization, denitrification and oxidation module
FIG. 4 is a partial view of an absorption reaction zone and its external components;
FIG. 5 is a partial view of a cyclical oxidation zone;
FIG. 6 is a partial view of a smoke abatement zone and its external components;
1. flue gas enters the module; 101. a bag-type dust collector; 102. a rotary kiln induced draft fan; 103. a control valve; 104. a tunnel kiln induced draft fan; 2. a desulfurization, denitrification and oxidation module; 201. a desulfurizing and denitrating agent storage device; 202. a desulfurization, denitrification and oxidation pump; 203. a desulfurization, denitrification and oxidation device; 3. a first-stage desulfurization and denitrification solution spraying device; 4. an absorption tower; 401. an absorption reaction zone; 402. a cyclic oxidation zone; 403. a smoke defogging area; 5. a second-stage denitration solution injection device; 401-1, a perturbation pump; 401-2, gypsum discharge port; 401-3, a circulating pump inlet; 401-4, lime slaking solution inlet; 401-5, an oxidation fan inlet; 401-6, an absorption tower inlet flue; 402-1, a spray layer of the nozzle; 403-1 clear water spraying device; 5. an oxidation blower; 6. a gypsum discharge pump; 7. a cyclone; 8. a vacuum filter; 9. a liquid filtering pool; 10. a circulation pump; 11. lime slaking slurry pump; 12. a stirrer; 13. lime slaking device; 403-2, a tube bundle dust removal demister; 403-3, a two-stage plate type dust and mist remover.
Detailed Description
The present utility model will be described in detail below with reference to the accompanying drawings and examples.
In the description of the present utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description of the present utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" is at least two unless explicitly defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Referring to fig. 1-6, a desulfurization and denitrification integrated treatment system comprises,
the flue gas inlet module 1 comprises a rotary kiln flue gas and/or tunnel kiln flue gas inlet device, wherein the rotary kiln flue gas device comprises a bag-type dust remover 101 and a rotary kiln induced draft fan 102, a control valve 103 for controlling the flow of the rotary kiln flue gas is arranged between the bag-type dust remover 101 and the rotary kiln induced draft fan 102, and the tunnel kiln flue gas device comprises a tunnel kiln induced draft fan 104 for drawing the movement of the tunnel kiln flue gas;
the desulfurization, denitrification and oxidation module 2 comprises a desulfurization, denitrification and oxidation agent storage device 201, a desulfurization, denitrification and oxidation pump 202 and a desulfurization, denitrification and oxidation device 203 communicated with the tunnel kiln induced draft fan 104 and/or, wherein a first-stage desulfurization, denitrification and oxidation solution injection device 3 is arranged at the inlet of the desulfurization, denitrification and oxidation device 203, and the purpose is to complete a partial pre-oxidation function before flue gas enters the absorption tower 4, and to convert NO into NO by using a denitrification agent sodium chlorite mixed solution 3 + Ions, SO 2 And SO 3 Conversion to SO 3 2- And SO 4 2- Ions;
the absorption tower 4 comprises an absorption reaction zone 401, a circulating oxidation zone 402 and a flue gas demisting zone 403, a second-stage denitration solution injection device 5 is arranged between the absorption reaction zone 401 and the circulating oxidation zone 402 and is used for further improving the oxidation efficiency, and the absorption reaction zone 401 is used for injecting the residual SO 2 And SO 3 Is absorbed and dissolved into HSO by water in slurry 3 + And HSO 4 - Ions are further ionized into SO 3 2- And SO 4 2- Ions, then with Ca in lime slurry 2+ Ion reaction to form sulfate and sulfite, NO 3 + Ions and Ca 2+ The ions react to form nitrates, and the cyclical oxidation zone 402 is used to complete oxidation and crystallization of desulfurization byproducts and denitration byproducts.
Specifically, the absorption reaction zone 401 includes a disturbance pump 401-1 forming a loop with the bottom of the absorption tower 4, a gypsum discharge port 401-2, a circulating pump 10 inlet 401-3, a lime slaking solution inlet 401-4, an oxidation fan 5 inlet 401-5, an absorption tower inlet flue 401-6 communicated with a denitration and oxidation device, the circulating oxidation zone 402 is a spray layer 402-1 provided with a plurality of nozzles, and the flue gas demisting zone 403 is a two-stage dedusting demister and clear water spraying device 403-1.
Specifically, the purpose of the disturbance pump 401-1 is that the disturbance pump 401-1 circulates the slurry at the bottom of the absorption tower 4, thereby effectively avoiding dead angles and deposition in the absorption tower 4, and the inlet 401-5 of the oxidation fan 5 is communicated with the oxidation fan 5 for providing oxidation air required by forced oxidation of the reaction product, and the oxidation fan 5 is a Roots blower.
Specifically, the gypsum discharge port 401-2 is sequentially communicated with the gypsum discharge pump 6 and the cyclone 7, gypsum at the lower layer of the cyclone 7 is prepared and stored or discharged after passing through the vacuum filter 8, and filtrate at the upper layer of the cyclone 7 enters the liquid filtering tank 9 for storage.
Specifically, the inlet 401-3 of the circulating pump 10 is sequentially connected with four circulating pumps 10, so that slurry is pumped to four spraying layers 402-1, sprayed by nozzles, and atomized liquid drops with fine particles and high reactivity are formed.
Specifically, the lime slaking solution inlet 401-4 is sequentially communicated with the lime slaking solution pump 11 and the lime slaking device 13 with the stirrer 12 arranged inside, the lime slaking device 13 is communicated with the lime storage tank, and the lime slaking device 13 is communicated with the filtrate tank 9 through the filtrate pump, so that the purpose of the lime slaking solution is to directly prepare the lime slaking solution by utilizing the filtrate in the filtrate tank 9.
Specifically, a clear water injection device 403-1 is arranged in an absorption tower inlet flue 401-6 to pre-spray and cool the flue gas, so that the temperature stability of the flue gas at the spray tower inlet and the safety of equipment in the tower are ensured.
Specifically, the two-stage dust and mist eliminator are a primary tube bundle dust and mist eliminator 403-2 and a secondary plate dust and mist eliminator 403-3 in sequence from top to bottom.
Specifically, a layer of clear water spraying devices 403-1 are respectively arranged above and below the tube bundle dust removal demister 403-2, and a layer of clear water spraying devices 403-1 are arranged below the plate dust removal demister 403-3.
The principle of the present embodiment is that,
first, the mixed solution of sodium chlorite for NO and SO 2 The reaction equation for performing oxidation is as follows:
4NO+3R-NaClO 2 (Living) +2H 2 O＝4HNO 3 +3NaCl reaction type (1)
SO 2 +R-NaClO 2 (living))+2H 2 O＝2H 2 SO 4 +nacl equation (2);
second, water molecules and SO 2 And SO 3 The removal of the remaining portion of the sulfide ions was performed as follows:
SO 2 +H 2 O＝HSO 3 - +H + reactive (3)
SO 3 +H 2 O＝HSO 4 A reaction formula (4);
finally, nitric acid and sulfuric acid solutions are screened with lime (stone) or (alkali) as absorbents to form calcium sulfate and calcium carbonate, the reaction equations of which are as follows:
CaOH+HNO 3 ＝CaNO 3 +H 2 o reaction type (5)
H 2 SO 4 +2CaOH＝Ca 2 SO 4 +2H 2 O-reactive formula (6);
the inlet of the desulfurization and denitrification oxidation device 203 and the interior of the absorption tower 4 of the reaction formula (1) and the reaction formula (2) respectively perform two-stage reaction to form a two-stage oxidation mechanism, so that the denitrification efficiency and stability of the system are improved, the operation cost of denitrification is reduced, and the discharged flue gas is ensured to meet the emission standard.
In addition, the absorption reaction zone 401, the circulating oxidation zone 402 and the flue gas demisting zone 403 are sequentially arranged upwards and are matched with the flow direction of the flue gas in the absorption tower 4,
the absorption tower 4 is provided with two-stage demisters, the two-stage demisters are arranged at the upper part of the circulating oxidation zone 402 of the absorption tower 4, and after the flue gas passes through the circulating oxidation zone 402, the flue gas continuously flows through the two-stage demisters to remove the slurry mist drops. A layer of clear water injection device 403-1 is arranged above and below the tube bundle dust and mist eliminator 403-2 respectively, the cleaning water is strongly sprayed from the clear water injection device 403-1 to the tube bundle dust and mist eliminator 403-2 to take away solid particles on the forward flow surface and the reverse flow surface of the tube bundle dust and mist eliminator 403-2, and a layer of clear water injection device 403-1 is also arranged below the secondary mist eliminator. After the flue gas passes through two-stage demisting, the content of water drops carried by the flue gas is lower than 75mg/Nm 3 (dry basis).
The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (9)
1. A desulfurization and denitrification integrated treatment system is characterized by comprising,
the flue gas inlet module comprises a rotary kiln flue gas and/or tunnel kiln flue gas inlet device, the rotary kiln flue gas device comprises a bag-type dust remover and a rotary kiln induced draft fan, a control valve for controlling the flow of the rotary kiln flue gas is arranged between the bag-type dust remover and the rotary kiln induced draft fan, and the tunnel kiln flue gas device comprises a tunnel kiln induced draft fan for drawing the movement of the tunnel kiln flue gas;
the desulfurization, denitrification and oxidation module comprises a desulfurization, denitrification and oxidation agent storage device, a desulfurization, denitrification and oxidation pump and a desulfurization, denitrification and oxidation device communicated with a tunnel kiln induced draft fan and/or a tunnel kiln induced draft fan, wherein a first-stage desulfurization, denitrification and oxidation device inlet is provided with a first-stage desulfurization, denitrification and solution injection device, and the purpose is to complete a partial pre-oxidation function before flue gas enters an absorption tower, and to convert NO into NO by a denitrification agent sodium chlorite mixed solution 3 + Ions, SO 2 And SO 3 Conversion to SO 3 2- And SO 4 2- Ions;
the absorption tower comprises an absorption reaction zone, a circulating oxidation zone and a flue gas demisting zone, a second-stage denitration solution injection device is arranged between the absorption reaction zone and the circulating oxidation zone and used for further improving oxidation efficiency, and the absorption reaction zone is used for injecting residual SO (sulfur dioxide) 2 And SO 3 Is absorbed and dissolved into HSO by water in slurry 3 + And HSO 4 - Ions are further ionized into SO 3 2- And SO 4 2- Ion(s)Then with Ca in lime slurry 2+ Ion reaction to form sulfate and sulfite, NO 3 + Ions and Ca 2+ The ionic reaction generates nitrate, and the circulating oxidation zone is used for completing oxidation and crystallization of desulfurization byproducts and denitration byproducts.
2. The integrated desulfurization and denitrification treatment system according to claim 1, wherein the absorption reaction zone comprises a disturbance pump, a gypsum discharge outlet, a circulating pump inlet, a lime slaking liquid inlet, an oxidation fan inlet and an absorption tower inlet flue communicated with the denitrification and oxidation device, the circulating oxidation zone is a spray layer provided with a plurality of nozzles, and the flue gas demisting zone is a two-stage dedusting demister and a clear water spraying device.
3. The desulfurization and denitrification integrated treatment system according to claim 2, wherein the purpose of the disturbance pump is that the disturbance pump circulates slurry at the bottom of the absorption tower, thereby effectively avoiding dead angles and sediments in the absorption tower, an oxidation fan inlet is communicated with an oxidation fan for providing oxidation air required by forced oxidation of reaction products, and the oxidation fan is a Roots blower.
4. The desulfurization and denitrification integrated treatment system according to claim 2, wherein the gypsum discharge port is sequentially communicated with a gypsum discharge pump and a cyclone, gypsum at the lower layer of the cyclone is prepared and stored or discharged after passing through a vacuum filter, and filtrate at the upper layer of the cyclone enters a filtrate tank for storage.
5. The desulfurization and denitrification integrated treatment system according to claim 2, wherein the circulating pump inlet is sequentially communicated with four circulating pumps, and the purpose of the system is to spray slurry to four spraying layers and spray the slurry through nozzles to form atomized liquid drops with fine particles and high reactivity.
6. The desulfurization and denitrification integrated treatment system according to claim 4, wherein the lime digestion liquid inlet is sequentially communicated with a lime digestion slurry pump and a lime digestion device with a stirrer arranged inside, the lime digestion device is communicated with a lime storage tank, and the lime digestion device is communicated with a filtrate tank through a filtrate pump, so that the purpose of preparing lime digestion slurry by directly utilizing filtrate in the filtrate tank is achieved.
7. The desulfurization and denitrification integrated treatment system according to claim 2, wherein a clear water injection device is arranged in an inlet flue of the absorption tower, and is used for carrying out pre-spray cooling treatment on flue gas, so that the temperature stability of the flue gas at the inlet of the spray tower and the safety of equipment in the tower are ensured.
8. The desulfurization and denitrification integrated treatment system according to claim 2, wherein the two-stage dedusting demister comprises a primary tube bundle dedusting demister and a secondary plate dedusting demister in sequence from top to bottom.
9. The desulfurization and denitrification integrated treatment system according to claim 8, wherein a layer of clear water spraying devices are respectively arranged above and below the tube bundle dust removal demister, and a layer of clear water spraying devices are arranged below the plate type dust removal demister.
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