CN213012597U - High-purity magnesia apparatus for producing - Google Patents
High-purity magnesia apparatus for producing Download PDFInfo
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- CN213012597U CN213012597U CN202021610219.0U CN202021610219U CN213012597U CN 213012597 U CN213012597 U CN 213012597U CN 202021610219 U CN202021610219 U CN 202021610219U CN 213012597 U CN213012597 U CN 213012597U
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Abstract
The invention belongs to the technical field of high-purity magnesia preparation, and particularly relates to a high-purity magnesia production device. Aiming at the technical problem that a large amount of nitrogen oxides are generated in the shaft kiln calcination process in the existing high-purity magnesia shaft kiln production technology, the invention provides a high-purity magnesia production device comprising a oxy-fuel burner, which can reduce the nitrogen oxides, reduce the dosage of a denitrifier, reduce the energy consumption and the production cost from the source and greatly reduce the influence on the surrounding ecological environment. The device mainly comprises an oxygen supply unit, a combustion unit, a shaft kiln and a flue gas treatment unit. The fuel is fully mixed with the oxygen provided by the combustion unit and the oxygen supply unit and then enters the shaft kiln to be combusted to form a calcining zone, the raw material entering the shaft kiln is calcined at high temperature to produce high-purity magnesia, and the generated flue gas is treated by the flue gas treatment unit and then is discharged. The device of the invention utilizes the oxy-fuel combustion technology, the nitrogen content in the high-temperature area of the flame is low, the generation of about 80 percent of nitrogen oxide can be reduced, the generation amount of flue gas can be reduced, and the energy consumption is reduced. In addition, the total oxygen combustion temperature is high, and the productivity of the high-purity magnesia can be improved.
Description
Technical Field
The invention belongs to the technical field of high-purity magnesia preparation, and particularly relates to a high-purity magnesia production device.
Background
The high-purity magnesite is an important refractory material raw material, and the magnesia refractory material is widely applied to high-temperature operation industries such as metallurgy, building materials and the like.
In the current production technology, high-purity magnesite is mainly produced by a shaft kiln. Magnesite or light-burned magnesium is pressed into balls to prepare raw materials, and CO is completely removed through high-temperature calcination in a shaft kiln2And forming high-purity magnesite. The shaft kiln uses natural gas, coal gas or heavy oil as fuel, air is used for supporting combustion, due to the production process requirement, the calcining temperature of the shaft kiln is generally 1800-2000 ℃, a large amount of nitrogen oxides can be generated in the shaft kiln, and the nitrogen oxides in the flue gas in the shaft kiln are generally 4500-8000 mg/Nm3Even if some shaft kilns are provided with denitration devices, the emission concentration is far beyond the allowable emission value of the national standard. In order to treat the nitrogen oxides in the flue gas, a large amount of denitration agents are consumed, the production cost is increased, and the surrounding ecological environment is seriously polluted.
Disclosure of Invention
Aiming at the defects of the existing production device and method, the invention provides the high-purity magnesia production device comprising the oxy-fuel combustor, which reduces nitric oxides, the dosage of a denitrating agent, the energy consumption and the production cost from the source and greatly lightens the influence on the surrounding ecological environment.
The invention adopts the following technical scheme: a high-purity magnesite production device mainly comprises an oxygen supply unit, a combustion unit, a shaft kiln and a flue gas treatment unit. The oxygen supply unit comprises an oxygen generator set and a valve pipeline, and an outlet of the valve pipeline is connected with an air inlet of the combustion unit; the gas outlet of the combustion unit is communicated with the middle upper part of the shaft kiln body; the shaft kiln comprises a kiln body and a smoke outlet, and further comprises a feed inlet arranged at the top of the kiln body and a discharge outlet arranged at the bottom of the kiln body, wherein the smoke outlet of the shaft kiln arranged at the upper part of the kiln body is connected with a flue inlet of a smoke treatment unit, and smoke is discharged after being treated by the smoke treatment unit.
The combustion unit comprises a gas unit air inlet, a total oxygen burner, a fuel supply pipeline and a gas outlet, and preferably further comprises a cooling water pipeline. The fuel enters through a fuel supply pipeline, is mixed with oxygen from an oxygen supply unit in the oxy-fuel combustor and then enters the shaft kiln through a fuel gas outlet, and the fuel is combusted under the combustion supporting of the oxygen to form a calcining zone. The raw materials of magnesite or light burned magnesium and the like which are made by ball pressing enter from a feed inlet arranged at the top of the kiln body after being preheated, and are calcined at high temperature in a calcining zone, and the generated high-purity magnesite is discharged from a discharge outlet arranged at the bottom of the kiln body.
The fuel may be a gaseous fuel, preferably natural gas, or a liquid fuel, preferably heavy oil.
Can set up cooling water piping inside the total oxygen combustor of combustion unit, the outside sets up the cooling water interface, and the export intercommunication of cooling water piping goes into shaft kiln body upper portion. The cooling water is connected from the cooling water interface, cools the oxy-fuel combustor through cooling water pipeline, protects the combustor, finally spouts in the shaft kiln, and the central temperature of cooling flame prevents that the raw materials from melting.
The flue gas treatment unit comprises a flue, a denitration reactor, a dust remover and a fan, wherein the denitration reactor, the dust remover and the fan are sequentially communicated through the flue. Flue gas generated by reaction in the shaft kiln enters the flue gas treatment unit through a flue gas outlet at the top of the shaft kiln, and under the action of the fan, the flue gas sequentially enters the denitration reactor and the dust remover through the flue, and is discharged through the fan after being subjected to denitration and dust removal.
The invention has the beneficial effects that:
(1) the high-purity magnesia production device comprises the oxygen supply unit and the oxy-fuel combustor, can produce high-purity magnesia by using the oxy-fuel combustion technology, and can reduce the generation of about 80 percent of nitrogen oxides due to the low nitrogen content in the high-temperature area of the flame, reduce the generation amount of the nitrogen oxides from the source and greatly reduce the using amount of a denitration agent.
(2) Because the oxy-fuel combustion is adopted, the amount of the generated flue gas is less than that of air combustion, and the subsequent flue gas treatment is facilitated; the reduction of the amount of the flue gas can also reduce the heat taken away by the flue gas, thereby reducing the energy consumption.
(3) The total oxygen combustion flame temperature is high, and the productivity of the shaft kiln can be improved by about 30 percent.
(4) Because the flue gas treatment capacity is reduced, the sizes of the denitration reactor and the dust remover of the flue gas treatment unit can be correspondingly reduced, and meanwhile, the power of a fan used can be reduced, and the production cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a high-purity magnesite production apparatus and method according to the present invention;
in the figure, 1-oxygen supply unit, 2-combustion unit, 3-shaft kiln, 4-flue gas treatment unit; 21-a cooling water pipeline; 101-raw material, 102-high-purity magnesite, 103-fuel, 104-cooling water and 105-waste gas.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
Example 1
The main equipment specifications and parameters of the device of the embodiment are as follows:
an oxygen supply unit: oxygen flow 9m3Min and pressure 0.6 MPa.
A total oxygen burner: power 10x106kJ/h。
A shaft kiln: 2600mm in diameter and 11000mm in height.
A flue gas treatment unit: smoke treatment capacity 60000m3/h。
A high-purity magnesite production device shown in figure 1 mainly comprises an oxygen supply unit 1, a combustion unit 2, a shaft kiln 3 and a flue gas treatment unit 4. The oxygen supply unit 1 comprises an oxygen generator set and a valve pipeline, and an outlet of the valve pipeline is communicated with an air inlet of the combustion unit 2; the combustion unit 2 comprises a combustion unit air inlet, a fuel supply pipeline, a total oxygen combustor and a fuel gas outlet, the fuel gas outlet is communicated with the middle upper part of the kiln body of the shaft kiln 3, and the fuel 103 enters the total oxygen combustor through the fuel supply pipeline, is mixed with oxygen entering from the combustion unit air inlet and then enters the shaft kiln through the fuel gas outlet for combustion; the flue gas outlet of the shaft kiln 3 is connected with the flue gas treatment unit 4, and the flue gas is treated and then discharged into waste gas 105.
Inside cooling water pipeline 21 that sets up of combustion unit oxy-fuel combustor, the outside sets up the cooling water interface, and inside the export of cooling water pipeline 21 let in the shaft kiln body, cooling water 104 was followed the cooling water interface and is inserted, cools off the oxy-fuel combustor through cooling water pipeline, finally spouts in shaft kiln 3.
The raw material 101 enters from a feed inlet arranged at the top of the shaft kiln 3 and descends under the action of gravity; the raw material 101 is dried and preheated at the upper part of the shaft kiln 3, the fuel 103 entering the shaft kiln 3 from the combustion unit 2 generates combustion reaction under the combustion supporting of oxygen, the combustion reaction raises the temperature of the raw material to form a calcining zone, high-purity magnesite 102 is generated, and the high-purity magnesite 102 at the lower part of the shaft kiln 3 is cooled and discharged from a discharge hole at the bottom of the shaft kiln 3. Due to the existence of the combustion unit, the fuel 103 and the oxygen can be mixed before entering the shaft kiln, the flame temperature is high, the calcining speed is high, and the capacity of the shaft kiln can be improved by about 30 percent. Flue gas generated in the shaft kiln 3 enters the flue gas treatment unit 4 through a flue gas outlet at the upper part of the shaft kiln 3, and is discharged after denitration and dust removal.
Due to the addition of the combustion unit and the adoption of the oxy-fuel combustor, the concentration of nitrogen oxides in the flue gas discharged from the shaft kiln 3 is 900-1600 mg/Nm3The concentration of nitrogen oxides in flue gas discharged from a traditional air-fired high-purity magnesia production shaft kiln is 4500-8000 mg/Nm3By adopting the high-purity magnesia production device, the concentration of nitrogen oxides in the flue gas discharged by the shaft kiln can be reduced by about 80 percent compared with the traditional high-purity magnesia production shaft kiln with air combustion, and the total amount of the generated flue gas is reduced by about 10 percent compared with the traditional high-purity magnesia production shaft kiln with air combustion. This means that after adding the oxy-fuel combustor in this apparatus for producing, flue gas volume and the nitrogen oxide that the flue gas processing unit needs to handle reduce, can reduce the denitrifier quantity of use, and denitration reactor and dust remover size can shrink, and fan power also can reduce. Meanwhile, the reduction of the amount of the flue gas means that the heat taken away by the flue gas is correspondingly reduced, so that the energy consumption of the device can be reduced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: modifications can be made to the technical solutions described in the embodiments or equivalent substitutions can be made on some technical features; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. The high-purity magnesite production device is characterized by comprising an oxygen supply unit, a combustion unit, a shaft kiln and a flue gas treatment unit; the shaft kiln comprises a kiln body and a flue gas outlet, and also comprises a feed inlet arranged at the top of the kiln body and a discharge outlet arranged at the bottom of the kiln body, and the flue gas treatment unit comprises a flue; the valve pipeline outlet of the oxygen supply unit is communicated with the air inlet of the combustion unit, the fuel gas outlet of the combustion unit is communicated with the middle upper part of the shaft kiln body, and the flue gas outlet of the shaft kiln is arranged on the upper part of the shaft kiln body and communicated with the flue gas inlet of the flue gas treatment unit.
2. The apparatus for producing high-purity magnesite according to claim 1, wherein the flue gas treatment unit further comprises a denitration reactor, a dust remover and a fan, and the denitration reactor, the dust remover and the fan are sequentially communicated through a flue.
3. The apparatus for producing high purity magnesite according to claim 1 or 2, wherein a cooling water pipeline is further provided inside the combustion unit oxy-fuel burner, and an outlet of the cooling water pipeline is communicated with the middle upper part of the shaft kiln body.
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| CN202021610219.0U CN213012597U (en) | 2020-08-05 | 2020-08-05 | High-purity magnesia apparatus for producing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023174082A1 (en) * | 2022-03-14 | 2023-09-21 | 沈阳化工大学 | High-purity co2 coproduction reactor which calcines small-particle carbonate ore, and method therefor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023174082A1 (en) * | 2022-03-14 | 2023-09-21 | 沈阳化工大学 | High-purity co2 coproduction reactor which calcines small-particle carbonate ore, and method therefor |
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