CN218688015U - Waste incineration tail gas treatment system - Google Patents
Waste incineration tail gas treatment system Download PDFInfo
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- CN218688015U CN218688015U CN202222718961.9U CN202222718961U CN218688015U CN 218688015 U CN218688015 U CN 218688015U CN 202222718961 U CN202222718961 U CN 202222718961U CN 218688015 U CN218688015 U CN 218688015U
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Abstract
The utility model discloses a waste incineration tail gas processing system, this system include consecutive alkali residue thick liquid enrichment facility, centrifugal device, mixing agitator, storage hole, filter sieve, alkali residue thick liquid storage tank, spray drying tower, sack cleaner. The utility model provides an available ammonia alkali factory alkali sediment direct processing waste incineration tail gas of waste incineration tail gas processing system, the flow is simple, waste incineration tail gas treatment effect is good, HCl desorption efficiency > 95%, SO 2 The removal efficiency is more than 80 percent, and the HF removal efficiency is more than 98 percentThe heavy metal removal efficiency is more than 80 percent.
Description
Technical Field
The utility model relates to an atmosphere pollution administers technical field, in particular to msw incineration tail gas processing system.
Background
A large amount of alkaline residues are produced in the production process of soda by an ammonia-soda process, a large amount of ammonia distillation waste liquid is produced in an ammonia distillation process in the process of producing soda by the ammonia-soda process, the ammonia distillation waste liquid contains 1-4% of solid-phase substances, the solid-phase substances separated from the ammonia distillation waste liquid after settling and clarification are the alkaline residues, meanwhile, the solid waste produced in the brine refining process of a soda plant is salt slurry, the alkaline residues and the salt slurry have similar main components and are commonly called as the alkaline residues, and the main components of the alkaline residues comprise: caCO 3 、CaSO 4 、Ca(OH) 2 、CaO、Mg(OH) 2 And CaCl 2 And NaCl and the like, the alkaline residue has strong alkalinity and large amount, not only occupies precious land resources, but also causes damage to peripheral plants and the like, and meanwhile, harmful substances permeate into underground water to pollute water resources. The comprehensive utilization technology of the caustic sludge is not few, but not only can meet the current social requirements, but also really realizes industrialization.
In the garbage disposal industry, incineration power generation of garbage which can not be recycled is a commonly adopted method. Deacidifying waste incineration tail gas (namely removing harmful acidic gases HCl and SO in waste gas) 2 HF, etc.) currently, calcium-based slaked lime (Ca (OH) 2 ) As a deacidification agent, the slaked lime is strictly supervised in the links of raw material mining, firing, digestion and the like, the cost is high, the deacidification operation cost is high, and the production of the slaked lime needs to be calcined and processed by mining mines, so that secondary pollution is caused. Other deacidification agents for waste incineration tail gas, such as sodium-based caustic soda (NaOH), sodium bicarbonate and the like, have high price, high operation cost pressure and no large-scale application value.
In the prior art, patent CN1248483A discloses a flue gas desulfurization method, which realizes the application of ammonia distillation alkali residue in flue gas desulfurization, and the method adopts carbide residue and ammonia distillation alkali residue or the mixture of the carbide residue and the ammonia distillation alkali residue as a desulfurizing agent, and sprays the desulfurizing agent into flue gas after drying treatment, and the desulfurizing agent and SO in the flue gas 2 Dry desulfurization of the reaction. Preferably, the mixture of the two is used as a desulfurizer, and the ratio of the desulfurizer to the desulfurizer is 4:6-6:4 by carrying outWhen the mixture ratio is used, the desulfurization efficiency is 65-75%. Patent CN1268387a discloses a method for removing sulfur oxides in flue gas by using soda plant waste residue, which is to introduce flue gas and soda plant waste residue slurry into a reactor to make them fully contact with each other for desulfurization reaction. The reactor can be a spray absorption tower, a Venturi absorption tower, a packing type absorption tower and other semi-dry or wet absorption devices. The desulfurizer is prepared by adopting seawater or fresh water, and is mixed with part of fly ash and lime according to the condition to prepare slurry with the mass concentration of 10-20%. The desulfurization product of the method is a mixture of calcium sulfite and calcium sulfate. Patent CN214182506U discloses a domestic waste power plant caustic soda piece deacidification system relates to msw incineration tail gas deacidification technical field for solve the problem of current msw incineration deacidification system deacidification inefficiency. The system passes through 10m 3 The sodium hydroxide solution preparing and storing integrated tank is used for preparing and storing the sodium hydroxide solution, the sodium hydroxide solution is conveyed to the reaction tower through the sodium hydroxide solution conveying pump and is further connected to industrial water pipes of the atomizers, and therefore the purpose of improving deacidification efficiency is achieved by installing the system in the lime slurry preparation room, and the system can be applied to a waste incineration treatment system.
The tail gas from waste incineration is more difficult to treat than the boiler smoke due to the complexity of the waste components, and the tail gas from waste incineration is traditionally slaked lime (Ca (OH) 2 ) Or caustic soda (NaOH), etc., as deacidification agents, which are expensive to process.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems existing in the prior art, the utility model aims to provide a waste incineration tail gas treatment system.
In order to realize the purpose, the utility model adopts the technical scheme that:
the utility model provides a waste incineration tail gas processing system, waste incineration tail gas processing system including consecutive alkali residue thick liquid enrichment facility, centrifugal device, mixing agitator, storage hole, filter sieve, alkali residue thick liquid storage tank, spray drying tower, sack cleaner.
The utility model discloses a waste incineration tail gas processing system is the processing system who utilizes ammonia alkali factory alkali sediment to handle waste incineration tail gas.
The object treated by the alkali residue slurry concentration device is ammonia evaporation waste liquid generated in the ammonia evaporation process of an ammonia alkali factory.
Preferably, in the waste incineration tail gas treatment system, the caustic sludge slurry concentration device is connected with the centrifugal device through a first delivery pump.
Preferably, in the waste incineration tail gas treatment system, the storage pit is connected with the filter sieve through a second conveying pump.
Preferably, in the waste incineration tail gas treatment system, the alkaline residue slurry storage tank is connected with the spray drying tower through a third delivery pump.
Preferably, in this kind of waste incineration tail gas processing system, the inside stirring rake that is equipped with of caustic sludge thick liquid enrichment facility.
Preferably, in the waste incineration tail gas treatment system, the centrifugal device is a horizontal centrifuge; further preferably, the rotation speed of the horizontal centrifuge is 1000-3000rpm.
Preferably, in the waste incineration tail gas treatment system, the mixing stirrer is a colter type mixer; more preferably, a dispersing fly cutter is provided in the mixing agitator.
The storage pit of the utility model is arranged in a waste incineration plant.
Preferably, in the waste incineration tail gas treatment system, a stirring paddle is arranged inside the storage pit.
Preferably, in the waste incineration tail gas treatment system, a stirring paddle is arranged inside the alkaline residue slurry storage tank.
Preferably, in the waste incineration tail gas treatment system, the top of the spray drying tower is provided with a rotary atomizer; further preferably, the rotary atomizer has a rotational speed of 9000-15000rpm.
The beneficial effects of the utility model are that:
the utility model provides an available ammonia alkali factory alkali sediment direct processing waste incineration tail gas of waste incineration tail gas processing system, the flow is simple, and waste incineration tail gas treatment effect is good, the HCl desorptionEfficiency > 95%, SO 2 The removal efficiency is more than 80 percent, the HF removal efficiency is more than 98 percent, and the heavy metal removal efficiency is more than 80 percent.
Drawings
FIG. 1 is a schematic view of a waste incineration tail gas treatment system.
Reference numeral 1:
in the figure: 100-caustic sludge slurry concentration device, 200-first delivery pump, 300-centrifugal device, 400-mixing stirrer, 500-storage pit, 600-second delivery pump, 700-filter sieve, 800-caustic sludge slurry storage tank, 900-third delivery pump, 1000-spray drying tower and 1100-bag dust remover.
Detailed Description
The embodiments of the present invention will be described in detail below, and the embodiments described with reference to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
The present invention will be described in further detail with reference to specific examples.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected to each other, indirectly connected to each other through an intermediate member, or connected to each other through the inside of two members. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The starting materials, reagents or equipment used in the examples are, unless otherwise specified, either conventionally commercially available or may be obtained by methods known in the art. Unless otherwise indicated, the testing or testing methods are conventional in the art.
The utility model discloses a waste incineration tail gas processing system is including consecutive alkaline residue thick liquid enrichment facility 100, centrifugal device 300, mixing stirrer 400, storage hole 500, filter sieve 700, alkaline residue thick liquid storage tank 800, spray drying tower 1000, sack cleaner 1100.
As shown in fig. 1, the waste incineration tail gas treatment system of the embodiment of the present invention includes an alkali residue slurry concentration device 100, a first delivery pump 200, a centrifugal device 300, a mixing agitator 400, a storage pit 500, a second delivery pump 600, a filter sieve 700, an alkali residue slurry storage tank 800, a third delivery pump 900, a spray drying tower 1000, and a bag-type dust collector 1100 which are connected in sequence.
The following describes an implementation method of the waste incineration tail gas treatment system according to an embodiment of the present invention with reference to fig. 1, ammonia evaporation waste liquid (stock solution, solid content 1-4%) generated in ammonia evaporation process of ammonia soda plant enters the caustic sludge slurry concentration device 100 for concentration, bottom concentrated caustic sludge slurry (solid content 6-10%) is delivered to a centrifugal device 300 through a first delivery pump 200 for centrifugal dehydration, the centrifugal device 300 can adopt a horizontal centrifuge, and caustic sludge with water content of 40-50% is obtained after being treated by the centrifugal device 300; adding the caustic sludge into a mixing stirrer 400, wherein the mixing stirrer 400 can adopt a colter type mixer, water and a chelating agent are added into the mixing stirrer 400, the chelating agent can adopt one or more of piperazine chelating agent, organic sulfur, EDTA, dithiocarbamate, sodium dimethyl dithiocarbamate SDD and inorganic sulfur, the mixing stirrer 400 obtains caustic sludge slurry after stirring, the caustic sludge content in the caustic sludge slurry is controlled to be 1-30wt%, and the chelating agent content is controlled to be 0.001-0.05wt%; the caustic sludge slurry obtained by the mixing stirrer 400 is conveyed to a garbage incineration plant through a conveying tool, the garbage incineration plant digs a storage pit 500 at a proper place for storing the caustic sludge slurry, and meanwhile, the storage pit 500 is matched with stirring slurry to prevent the caustic sludge slurry from aggregating and agglomerating; when the waste incineration tail gas needs to be treated, the waste incineration tail gas is conveyed to the filter sieve 700 through the second conveying pump 600 to be sieved, the second conveying pump 600 adopts a submerged pump, the alkali residue slurry after the sieving of the filter sieve 700 enters the alkali residue slurry storage tank 800, a stirring paddle is arranged inside the alkali residue slurry storage tank 800, the alkali residue slurry inside the alkali residue slurry storage tank 800 is conveyed into the spray drying tower 1000 through the third conveying pump 900, meanwhile, the waste incineration tail gas is conveyed into the spray drying tower 1000 after being cooled, the temperature of the cooled waste incineration tail gas is controlled to be 80-230 ℃ when the waste incineration tail gas enters the spray drying tower 1000, the tail gas treated by the alkali residue slurry in the spray drying tower 1000 enters the bag-type dust collector 1100, and the tail gas treated by the bag-type dust collector 1100 enters a subsequent treatment system.
Example 1
Referring to fig. 1, the present embodiment provides a method using a waste incineration exhaust gas treatment system, wherein the dry components of the alkaline residue used in the present embodiment are shown in table 1 below, and the particle size distribution of the alkaline residue used in the present embodiment is shown in table 2 below.
TABLE 1 alkaline residue Dry basis composition Table
TABLE 2 particle size distribution of caustic sludge
| Particle size (. Mu.m) | ≤1 | ≤2 | ≤4 | ≤8 | ≤10 | ≤15 | ≤20 | ≤25 | ≤38 |
| V(％) | 5.8 | 14.1 | 32.6 | 58.1 | 65.3 | 80.5 | 88.9 | 95.2 | 100 |
The method specifically comprises the following steps:
1. preparation of alkaline residue slurry
Precipitating and concentrating ammonia distillation waste liquid (stock solution with solid content of 1-4%) in a distillation and absorption workshop of an ammonia-soda plant to obtain solid content of 6-10%, centrifugally dewatering and separating to obtain caustic sludge with water content of 40-50%, conveying the centrifugally dewatered caustic sludge to a waste incineration tail gas to be treated, and mixing the caustic sludge, water and a chelating agent (piperazine chelating agent or organic sulfur or EDTA or dithiocarbamate or SDD or inorganic sulfur) in a mixing stirrer to prepare deacidification agent caustic sludge slurry with water content of 70-95%. The concentration of the chelating agent in the caustic sludge slurry with the water content of 70-95% is 0.001% -0.05%, the uniformly mixed caustic sludge slurry is stored in a storage pit, and when the caustic sludge slurry is used, large-particle impurities are removed by sieving, and the caustic sludge slurry is added into a spray drying tower through a caustic sludge slurry pump to remove harmful acid gas and heavy metal in the waste incineration tail gas.
2. Deacidifying and heavy metal removing reaction for waste incineration tail gas
Cooling the temperature of the waste gas from the garbage incinerator from 300-400 ℃ to 80-230 ℃, and then entering a spray drying tower for deacidification and heavy metal removal absorption reaction; the caustic sludge slurry pump sends the caustic sludge slurry into a high-speed rotary atomizer at the top of the spray drying tower, the high-speed rotary atomizer atomizes the caustic sludge slurry into fine droplets, and the atomized caustic sludge slurry droplets and HCl and SO in the waste gas 2 HF gas and heavy metal ions are fully downstreamCarrying out countercurrent contact reaction to generate calcium chloride, magnesium chloride, calcium sulfite, calcium fluoride and heavy metal chelate; meanwhile, the water of the alkaline residue slurry is quickly evaporated under the drying and steaming of the high-temperature tail gas, the reaction products of calcium chloride, magnesium chloride, calcium sulfite, calcium fluoride, heavy metal chelate and other alkaline residue slurry solids are dried and separated out during the deacidification and heavy metal removal, large-particle fly ash is discharged from the bottom of the spray drying tower, small-particle fly ash enters subsequent dust removal equipment through flue gas, and the temperature of the flue gas outlet of the spray drying tower is controlled to be 80-160 ℃.
Deacidifying efficiency of a spray drying tower: HCl removing efficiency is higher than 95%, SO removing efficiency is higher than 95% 2 The efficiency is more than 80%, the HF removing efficiency is more than 98%, and the heavy metal removing efficiency is more than 80%.
Although the specific embodiments of the present invention have been described with reference to the accompanying drawings, the scope of the present invention is not limited thereto, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The waste incineration tail gas treatment system is characterized by comprising an alkali residue slurry concentration device, a centrifugal device, a mixing stirrer, a storage pit, a filter sieve, an alkali residue slurry storage tank, a spray drying tower and a bag-type dust remover which are sequentially connected.
2. The waste incineration tail gas treatment system according to claim 1, wherein a stirring paddle is arranged inside the caustic sludge slurry concentration device.
3. The waste incineration tail gas treatment system of claim 1, wherein the centrifugal device is a horizontal centrifuge.
4. The waste incineration tail gas treatment system according to claim 3, wherein the rotation speed of the horizontal centrifuge is 1000-3000rpm.
5. The waste incineration tail gas treatment system of claim 1, wherein the mixing agitator is a coulter mixer.
6. The waste incineration tail gas treatment system according to claim 1, wherein a stirring paddle is arranged inside the storage pit.
7. The waste incineration tail gas treatment system according to claim 1, wherein a stirring paddle is arranged inside the caustic sludge slurry storage tank.
8. The waste incineration tail gas treatment system of claim 1, wherein the spray drying tower is equipped with a rotary atomizer at the top.
9. The waste incineration tail gas treatment system according to claim 8, wherein the rotating atomizer has a rotating speed of 9000-15000rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222718961.9U CN218688015U (en) | 2022-10-14 | 2022-10-14 | Waste incineration tail gas treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222718961.9U CN218688015U (en) | 2022-10-14 | 2022-10-14 | Waste incineration tail gas treatment system |
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| Publication Number | Publication Date |
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| CN218688015U true CN218688015U (en) | 2023-03-24 |
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| CN202222718961.9U Active CN218688015U (en) | 2022-10-14 | 2022-10-14 | Waste incineration tail gas treatment system |
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