CN213559104U - Desulfurization ash pyrolysis device - Google Patents
Desulfurization ash pyrolysis device Download PDFInfo
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- CN213559104U CN213559104U CN202022427179.2U CN202022427179U CN213559104U CN 213559104 U CN213559104 U CN 213559104U CN 202022427179 U CN202022427179 U CN 202022427179U CN 213559104 U CN213559104 U CN 213559104U
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Abstract
The utility model discloses a desulfurization ash pyrolysis device belongs to the environmental protection field. The device comprises at least one thermal decomposition cylinderThe thermal decomposition cylinder is composed of an inner cylinder and an outer cylinder, a plurality of thermal decomposition cylinders are connected in series, the inlet of the thermal decomposition cylinder at the head part and the desulfurization ash bin vector are arranged, and the thermal decomposition cylinder at the tail part is provided with a solid product outlet end. The utility model discloses can realize the high-efficient decomposition of dry process desulfurization ash, obtain the high-efficient comprehensive utilization of being convenient for contain SO2A raw material gas. Adjusting by carrier gas, and decomposing without oxygen to obtain rich SO2And the concentration of the decomposed gas, SO2The volume content can reach more than 8 percent, and the decomposed gas does not contain O2Can be directly used as raw material gas to prepare products such as sodium metabisulfite, sulfur and the like, and realizes the high-efficiency resource utilization of the sulfur.
Description
Technical Field
The utility model relates to an environmental protection field, concretely relates to desulfurization ash pyrolysis device.
Background
Sulfur dioxide (SO)2) Is an important atmospheric pollutant and a restrictive index of national economic development, and the flue gas desulfurization is used for treating SO2The main means of (1). At present, a large number of flue gas desulfurization facilities are established in China, and a part of the facilities adopt a dry desulfurization process, which has the advantages of water saving, land saving, no white smoke plume and the like, but can generate a large number of desulfurization byproducts (desulfurization ash). According to incomplete statistics, the yield of the dry-method desulfurized fly ash in 2017 in China exceeds 1000 ten thousand tons, and the yield of the desulfurized fly ash in the future is continuously increased. The dry desulfurization ash is influenced by flue gas parameters, desulfurization process, operation conditions and the like, and has the characteristics of complex components, low water content (generally within 2 percent), and fine particle size (the medium particle size is about 10-30 mu m). Dry desulfurized fly ash is composed of several constituents, the most predominant of which is CaSO3·1/2H2O (mass content is more than 50 percent) and the balance of CaCO3、CaSO4·2H2O、Ca(OH)2And a small amount of CaCl2、SiO2、Al2O3、Fe2O3And the like. The dry-process desulfurized fly ash has poor stability and a large amount of impurities, is difficult to directly and efficiently utilize, is easy to cause secondary pollution by stacking, causes a series of environmental problems and even social problems, seriously restricts the further development of the technology, and urgently solves the problem of efficient comprehensive utilization.
The shortage of sulfur resources in China and the external dependence degree are as high as 60 percent, in recent years, the import quantity of sulfur per year is up to 1200 ten thousand tons, on one hand, a large amount of sulfur is imported for a long time, on the other hand, SO in flue gas2Inefficient or even ineffective disposal creates a significant waste of sulfur resources. Therefore, the research and development of a new high-efficiency resource utilization technology of the dry desulfurization byproduct, namely the desulfurization ash, can recycle resources such as sulfur, calcium and the like, has certain economic benefits, can effectively realize the reduction of the desulfurization byproduct, greatly reduces possible secondary pollution, has important environmental benefits and social benefits, and has important significance for promoting the improvement of desulfurization technology in China and ensuring the strategic safety of sulfur resources.
Most of the current dry-process desulfurized fly ash is stacked and treated, land is occupied, secondary pollution exists, a small part of the desulfurized fly ash is utilized in the field of buildings, and the mode comprises the preparation of concrete blocks, cement, asphalt mixtures and the like, but large-scale efficient digestion is difficult to realize due to the unstable property, impurities and the like of the desulfurized fly ash. The following problems mainly exist in the aspect of high-efficiency utilization of the desulfurized fly ash:
1. the stacking occupies a large amount of land and has secondary pollution. The yield of the dry-method desulfurized fly ash in China is huge, the yield exceeds 1000 ten thousand tons in 2017, the volume exceeds 1300 ten thousand cubic meters, the yield of the desulfurized fly ash in the future is continuously increased, the quantity is huge, and a large amount of land is occupied by long-term stacking; meanwhile, the dry-method desulfurized fly ash has poor stability and more impurities, is difficult to directly and efficiently utilize, has serious acidic precipitation problem in China, and slowly decomposes calcium sulfite to release a pollutant SO again under the condition that the desulfurized fly ash is stacked for a long time2Secondary pollution to the environment is caused, and a series of environmental problems and even social problems are caused.
2. Incomplete utilization of desulfurized fly ashLow-end utilization is the main reason, and large-scale consumption is difficult to realize. The desulfurized fly ash is used as an admixture material for preparing concrete blocks, cement, asphalt mixtures and the like, and is used in the field of construction, but the desulfurized fly ash by a dry method has unstable property and more impurities, so that more problems exist, for example, excessive sulfate compounds can generate crystal water due to hydration reaction, so that cement products generate micro expansion, and hidden troubles are brought to construction engineering; free calcium oxide in the desulfurized fly ash, Ca (OH) is continuously generated in the long-term hydration process2Volume expansion, which may have adverse consequences in use; chloride in the dry-method desulfurized ash has a corrosive effect on metals, and is used as a building material in occasions without steel bars; if the sulfur of the calcium sulfite is not treated reasonably, SO may be generated2Released to cause secondary pollution. Therefore, the doping proportion of the desulfurized fly ash in the production of building materials needs to be strictly controlled, the use amount of the desulfurized fly ash is limited in the current utilization mode, the added value of products is not high, and large-scale efficient consumption is difficult to realize.
3、CaSO3The decomposition is insufficient, and the yield of the target product is low; to increase the yield, the decomposition temperature needs to be increased, leading to increased energy consumption. During conventional high temperature treatment, CaSO3CaO generated by decomposition is covered in CaSO3Surface, product diffusion and escape are hindered, and internal CaSO is not favored3Resulting in incomplete decomposition. Further increase of decomposition temperature (up to 1000 deg.C) can promote CaSO to a certain extent3The decomposition of (2) but the high decomposition temperature leads to the increase of energy consumption, and simultaneously leads to the reduction of the surface area and the activity of byproduct CaO due to high-temperature sintering, thus being not beneficial to further recycling as a desulfurizer and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a desulfurization ash pyrolysis device to above-mentioned problem.
The purpose of the utility model can be realized by the following technical scheme:
the utility model provides a desulfurization ash pyrolysis device, the device includes a pyrolysis section of thick bamboo at least, a pyrolysis section of thick bamboo constitute by inner tube and urceolus, connect through the mode of establishing ties between a plurality of pyrolysis sections, the import of the pyrolysis section of thick bamboo of head links to each other with desulfurization ash storehouse, the pyrolysis section of thick bamboo of afterbody is equipped with desulfurization ash pyrolysis solid product export.
The utility model discloses among the technical scheme: high-temperature flue gas is introduced into the outer cylinder, and a flue gas inlet is arranged at the discharge end of the outer cylinder of the tail thermal decomposition cylinder; the flue gas outlet is arranged at the feed end of the outer cylinder of the head thermal decomposition cylinder.
The utility model discloses among the technical scheme: introducing carrier gas into the inner cylinder, wherein the carrier gas inlet is positioned at the feeding end of the inner cylinder of the head thermal decomposition cylinder; the carrier gas outlet is arranged at the discharge end of the inner cylinder of the tail thermal decomposition cylinder.
The utility model discloses among the technical scheme: the inner cylinder is also provided with a pipeline for conveying water, and the low-temperature water inlet is positioned at the feed end of the inner cylinder of the head thermal decomposition cylinder; the high-temperature water outlet is arranged at the discharge end of the inner cylinder of the tail thermal decomposition cylinder.
The utility model discloses among the technical scheme: the periphery of the water conveying pipeline is provided with a spiral auger.
The utility model discloses among the technical scheme: and an auxiliary agent bin is arranged on the side surface of the desulfurization ash bin.
The utility model discloses among the technical scheme: the bottom of the desulfurization ash bin is provided with a nitrogen inlet, and the top of the desulfurization ash bin is provided with a nitrogen outlet.
The utility model discloses among the technical scheme: through component regulation (compatibility among desulfurized ashes generated from different sources or under different working conditions, or addition of an auxiliary agent such as carbon), the desulfurized ash is ensured to contain a certain amount of Ca (OH)2And CaCO3Thereby improving the reaction conditions and promoting CaSO3The decomposition and the product activity are high, and the high-value utilization of the product is realized. The decomposition reaction temperature of the decomposition process of the dry desulfurization ash is recommended to be controlled in the region of 800-1000 ℃, and particularly in the region of 900-950 ℃. At the temperature, the decomposition reaction can be ensured, the possibility of sintering of the product CaO is reduced, the specific surface area of the CaO is larger, the activity is higher, the high-efficiency reutilization of the CaO as a desulfurizing agent is facilitated, the exploitation and consumption of the limestone raw ore are reduced, and the in-situ resource recycling of wastes is realized.
The utility model discloses among the technical scheme: ca (OH)2And CaCO3Is in favor of CaSO3Fully decomposing. When the temperature is higher than 580 deg.c,ca (OH) in desulfurized fly ash2Decomposing to CaO and H2O，H2The micro-airflow impact effect generated when O is released in the form of water vapor at high temperature helps to avoid Ca (OH)2CaO generated by decomposition is densely covered on CaSO3Surface, is favorable to CaSO3Release of decomposition products; CaCO at temperatures greater than 900 DEG C3Decomposition to CaO and CO2，CO2The gas generates impact and crushing action and is beneficial to reducing CaSO3CaSO being covered with decomposition product CaO3The surface forms a compact film structure, which is beneficial to the continuous progress of the decomposition reaction.
The utility model discloses among the technical scheme: through an anaerobic reactor, nitrogen is used as carrier gas (other inert gases can also be used), oxygen is isolated by feeding and discharging, and high-temperature heating is carried out to obtain the product rich in SO2Decomposition gas (SO)2Volume content of more than 8 percent) to obtain different SO by controlling the residence time of the carrier gas2Decomposing the gas at a concentration to obtain SO2The high-quality gas with adjustable and controllable concentration can be used as a raw material for preparing high value-added products such as sodium metabisulfite, sulfur and the like. Meanwhile, the micro positive pressure (0-100 Pa) environment in the anaerobic reactor is controlled, so that any micro leakage of the device is ensured not to cause adverse effect on the oxygen content of the decomposition product, and the reliable decomposition gas without oxygen is obtained. The decomposed gas contains no O2The limit of the reaction on the flue gas, SO, is eliminated2Can be conveniently used as raw material gas for further high-efficiency resource utilization (such as preparation of sodium metabisulfite, sulfur and the like).
The utility model discloses among the technical scheme: the anaerobic reactor can be used in single-stage or multi-stage series connection, relative motion and friction among material particles are enhanced through an enhanced stirring and mixing measure, replacement of new and old surfaces is promoted, full mixing is ensured, rapid reaction is promoted, and CaSO can be ensured due to full mixing and uniform heating of the material3The decomposition is complete at a relatively low temperature, and the reduction rate of the desulfurized ash can reach more than 40 percent, thereby realizing the effective reduction of the desulfurized ash.
The utility model discloses among the technical scheme: high-temperature flue gas of a boiler or other main combustion devices generating flue gas is used as a desulfurization ash decomposition heat source, and low-temperature flue gas after indirect heat exchange is introduced back to the main combustion devices, so that the process is simple and convenient to operate; for the condition that the high-temperature flue gas of the main combustion device generating the flue gas can not be utilized under the condition limitation, the high-temperature gas generated by a gas burner and the like can be used as a heat source. Meanwhile, a cooling system (a coolant can adopt water or other inert fluids) is arranged on the packing auger in the anaerobic reactor, the working temperature of the surface of the packing auger is controlled, the failure rate of the packing auger at high temperature is reduced, hot water is led out to heat flue gas through indirect heat exchange, the smoke plume lifting force is improved, the diffusion of pollutants is facilitated, the landing concentration is reduced, and the pollution is reduced; the cooled coolant is led back to a cooling system of the packing auger for recycling.
The utility model has the advantages that:
1. can realize the high-efficiency decomposition of the dry desulfurization ash and obtain SO-containing gas convenient for high-efficiency comprehensive utilization2A raw material gas. Adjusting by carrier gas, and decomposing without oxygen to obtain rich SO2And concentration-adjustable decomposition gas (SO)2Volume content of more than 8 percent) because the decomposed gas does not contain O2Can be directly used as raw material gas to prepare products such as sodium metabisulfite, sulfur and the like, and realizes the high-efficiency resource utilization of the sulfur.
2. The full decomposition of the dry desulfurization ash can be realized at a relatively mild temperature, and the product CaO is recycled as a desulfurizer. The temperature in the decomposition process is controlled below 1000 ℃, excessive decomposition temperature is not needed, the activity of the obtained product CaO is higher, the CaO content in the product reaches 50 percent, and CaCO3The content of the desulfurizer reaches 10 percent (weight), and the desulfurizer can be directly recycled.
3. The decomposition efficiency of the dry desulfurization ash is high, the reduction of the desulfurization ash can be effectively realized, the reduction rate can reach more than 40 percent (weight), and the treatment pressure of the desulfurization ash can be greatly reduced.
4. The process is simple, and the device can be efficiently combined with and cooperatively work with a main device. The heat source can be selected from high-temperature flue gas of a boiler, a gas furnace, electric heating and the like to obtain a heat source, and particularly the high-temperature flue gas of the boiler can be selected on site; the heat of the cooling circulating water can be recycled, and the comprehensive utilization of heat energy is realized.
Drawings
FIG. 1 is a diagram of a dry desulfurized fly ash pyrolysis apparatus.
Wherein: 1 is an inner cylinder, 2 is an outer cylinder, 3 is a packing auger, 4 is a pipeline for conveying water, 5 is a desulfurization ash bin, 6 is a flue gas inlet, 7 is a flue gas outlet, 8 is an auxiliary agent bin, 9 is a carrier gas inlet, 10 is a carrier gas outlet, 11 is a nitrogen gas inlet, 12 is a nitrogen gas outlet, 13 is a low-temperature water inlet, 14 is a high-temperature water outlet, and 15 is a desulfurization ash pyrolysis solid product outlet.
Detailed Description
The present invention will be further explained with reference to the following embodiments, but the scope of the present invention is not limited thereto:
referring to fig. 1, the desulfurization ash pyrolysis device at least comprises a thermal decomposition cylinder, wherein the thermal decomposition cylinder is composed of an inner cylinder 1 and an outer cylinder 2, the thermal decomposition cylinders are connected in series, an inlet of the thermal decomposition cylinder at the head part is connected with a desulfurization ash bin 5, and an outlet 15 for pyrolysis solid products of the desulfurization ash is arranged on the thermal decomposition cylinder at the tail part.
High-temperature flue gas is introduced into the outer cylinder 2, and a flue gas inlet 6 is arranged at the discharge end of the outer cylinder 2 of the tail thermal decomposition cylinder; the flue gas outlet 7 is arranged at the feed end of the outer cylinder 2 of the head thermal decomposition cylinder.
Carrier gas is introduced into the inner cylinder 1, and a carrier gas inlet 11 is positioned at the feed end of the inner cylinder 1 of the head thermal decomposition cylinder; the carrier gas outlet 10 is arranged at the discharge end of the inner cylinder 1 of the tail thermal decomposition cylinder.
The inner cylinder 1 is also provided with a pipeline 4 for conveying water, and a low-temperature water inlet 13 is positioned at the feed end of the inner cylinder 1 of the head thermal decomposition cylinder; the high-temperature water outlet 14 is arranged at the discharge end of the inner cylinder 1 of the tail thermal decomposition cylinder.
A spiral packing auger 3 is arranged around the water conveying pipeline. And an auxiliary agent bin 8 is arranged on the side surface of the desulfurization ash bin 5. The bottom of the desulfurization ash bin 5 is provided with a nitrogen inlet 11, and the top is provided with a nitrogen outlet 12.
Claims (7)
1. The utility model provides a desulfurization ash pyrolysis device which characterized in that: the device at least comprises a thermal decomposition cylinder, wherein the thermal decomposition cylinder is composed of an inner cylinder (1) and an outer cylinder (2), a plurality of thermal decomposition cylinders are connected in series, an inlet of the thermal decomposition cylinder at the head is connected with a desulfurization ash bin (5), and a thermal decomposition cylinder at the tail is provided with a desulfurization ash pyrolysis solid product outlet (15).
2. The desulfurized ash pyrolysis unit of claim 1 further comprising: high-temperature flue gas is introduced into the outer cylinder (2), and a flue gas inlet (6) is arranged at the discharge end of the outer cylinder (2) of the tail thermal decomposition cylinder; the flue gas outlet (7) is arranged at the feed end of the outer cylinder (2) of the head thermal decomposition cylinder.
3. The desulfurized ash pyrolysis unit of claim 1 further comprising: carrier gas is introduced into the inner cylinder (1), and a carrier gas inlet (9) is positioned at the feed end of the inner cylinder (1) of the head thermal decomposition cylinder; the carrier gas outlet (10) is arranged at the discharge end of the inner cylinder (1) of the tail thermal decomposition cylinder.
4. The desulfurized ash pyrolysis unit of claim 1 further comprising: the inner cylinder (1) is also internally provided with a pipeline (4) for conveying water, and the low-temperature water inlet (13) is positioned at the feed end of the inner cylinder (1) of the head thermal decomposition cylinder; the high-temperature water outlet (14) is arranged at the discharge end of the inner cylinder (1) of the tail thermal decomposition cylinder.
5. The desulfurized ash pyrolysis unit of claim 4 further comprising: a spiral auger (3) is arranged around the water conveying pipeline.
6. The desulfurized ash pyrolysis unit of claim 1 further comprising: an auxiliary agent bin (8) is arranged on the side surface of the desulfurization ash bin (5).
7. The desulfurized ash pyrolysis unit of claim 1 further comprising: the bottom of the desulfurization ash bin (5) is provided with a nitrogen inlet (11), and the top is provided with a nitrogen outlet (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022427179.2U CN213559104U (en) | 2020-10-27 | 2020-10-27 | Desulfurization ash pyrolysis device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022427179.2U CN213559104U (en) | 2020-10-27 | 2020-10-27 | Desulfurization ash pyrolysis device |
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| CN213559104U true CN213559104U (en) | 2021-06-29 |
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| CN202022427179.2U Active CN213559104U (en) | 2020-10-27 | 2020-10-27 | Desulfurization ash pyrolysis device |
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