CN213687787U - Grate rotary kiln pellet oxygen-enriched coal injection system - Google Patents
Grate rotary kiln pellet oxygen-enriched coal injection system Download PDFInfo
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- CN213687787U CN213687787U CN202022819130.1U CN202022819130U CN213687787U CN 213687787 U CN213687787 U CN 213687787U CN 202022819130 U CN202022819130 U CN 202022819130U CN 213687787 U CN213687787 U CN 213687787U
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Abstract
The utility model relates to a grate rotary kiln pellet oxygen-enriched coal injection system, which structurally comprises a combustor, a pulverized coal pneumatic conveying device, a combustion fan, an oxygen generation system, a controller and the like; the oxygen generation system is respectively connected with the air supply pipeline and the coal powder conveying pipeline through oxygen conveying pipelines and is used for providing oxygen for the combustor and the coal powder conveying pipelines; a first oxygen regulating valve is connected to the oxygen conveying pipeline connected with the air supply pipeline, and a second oxygen regulating valve is connected to the oxygen conveying pipeline connected with the pulverized coal conveying pipeline; the controller is respectively and electrically connected with the control ends of the fan regulating valve, the first oxygen regulating valve and the second oxygen regulating valve so as to respectively control the opening degrees of the fan regulating valve, the first oxygen regulating valve and the second oxygen regulating valve. The utility model discloses an oxygen boosting burning of buggy, but wide application in buggy burning trades such as pellet grate rotary kiln coal injection, lime rotary kiln coal injection, glass kiln coal injection.
Description
Technical Field
The utility model relates to a rotary kiln pellet production device, in particular to a grate rotary kiln pellet oxygen-enriched coal injection system.
Background
In recent years, with the economic development of China entering a new stage, the requirements of society and government departments on energy conservation and environmental protection are higher and higher. As a heavy industry, the steel industry has increasingly strict production smoke emission indexes. The pellet ore is one of the common furnace burden for blast furnace iron making, and the acidic pellet ore or the alkaline pellet ore is matched with the corresponding sinter ore and is the main furnace burden for blast furnace iron making of iron and steel enterprises in China at present. The grate-rotary kiln method is the main method for producing oxidized pellets in China and plays an important role in the blast furnace burden preparation process.
The main fuel coal powder of the pellets produced by most grate-rotary kiln methods also partially uses gas such as blast furnace gas, converter gas and the like, and the main advantage of burning the coal powder is that the cost of the raw and fuel is lower; the production is not limited by regions, and is suitable for areas without gas supply. The problems of the pulverized coal fuel are as follows: pulverized coal combustion is stable without gas combustion, and particularly when the machine is started, the fire extinguishing phenomenon is easy to occur; the requirements on the components of the volatile components of the coal dust are high, and the raw coal with low volatile components cannot meet the combustion requirements easily; the pulverized coal combustion has high requirement on the excess coefficient of air, the smoke volume is large, and the discharged pollutants are more; the combustion rate of the coal dust is low, and unburned coal dust is contained in discharged dust, so that fuel waste is caused.
With the increasing environmental protection standard, pellet flue gas in the steel industry needs to realize ultralow emission and SO2Emission concentration requirements are below 35mg/Nm3NOx emission concentration requirements are less than 50mg/Nm3Particulate matter emission concentration requirementLess than 10mg/Nm3This will bring great challenge to the environmental protection work of the iron and steel enterprises. From the existing desulfurization system of domestic grate-rotary kiln pellet manufacturers, because the environmental protection capabilities such as desulfurization are not enough by design, the denitration efficiency of the denitration system in the current grate-rotary kiln pellet production equipment is influenced by the improvement of production load, and the NOx emission is unstable.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a grate rotary kiln pelletizing oxygen boosting coal injection system to solve the big and pollution abatement of iron and steel trade pelletizing flue gas emission and cost-effective problem.
The utility model discloses a realize like this: a grate rotary kiln pellet oxygen-enriched coal injection system comprises:
the combustor provides a high-temperature heating source for sintering the pellets for the rotary kiln of the chain grate;
the pulverized coal pneumatic conveying device is connected with the combustor through a pulverized coal conveying pipeline and is used for conveying pulverized coal serving as fuel to the combustor; a check valve is connected on the pulverized coal conveying pipeline;
the combustion-supporting fan is connected with the combustor through an air supply pipeline and used for providing combustion-supporting air for the combustor; the air supply pipeline is connected with a fan regulating valve;
the oxygen generation system is respectively connected with the air supply pipeline and the coal powder conveying pipeline through an oxygen conveying pipeline and is used for providing oxygen for the combustor and the coal powder conveying pipeline; a first oxygen regulating valve is connected to the oxygen conveying pipeline connected with the air supply pipeline, and a second oxygen regulating valve is connected to the oxygen conveying pipeline connected with the pulverized coal conveying pipeline;
the controller is respectively and electrically connected with the control end of the fan regulating valve, the control end of the first oxygen regulating valve and the control end of the second oxygen regulating valve and is used for respectively controlling the opening degrees of the fan regulating valve, the first oxygen regulating valve and the second oxygen regulating valve; and
and the first temperature sensor is arranged in the rotary kiln of the chain grate machine, is electrically connected with the controller, and is used for sending a temperature signal of the rotary kiln of the chain grate machine to the controller so as to provide an adjusting basis for the controller to adjust the fan adjusting valve, the first oxygen adjusting valve and the second oxygen adjusting valve.
The utility model discloses still include:
the quick cut-off valve is arranged on the pulverized coal conveying pipeline, is electrically connected with the controller and is used for controllably cutting off the pulverized coal conveying pipeline when the oxygen content or the temperature in the pulverized coal conveying pipeline exceeds the limit;
the oxygen content detection device is arranged in the pulverized coal conveying pipeline, is electrically connected with the controller and is used for sending an oxygen content signal in the pulverized coal conveying pipeline to the controller; and
and the second temperature sensor is arranged in the pulverized coal conveying pipeline, is electrically connected with the controller and is used for sending a temperature signal in the pulverized coal conveying pipeline to the controller.
The utility model discloses still include:
the blow-down pipe is connected with an oxygen conveying pipeline communicated with the oxygen generating system, and the blow-down pipe is connected with an oxygen blow-down valve.
The utility model provides an oxygen that oxygen system made gets into, one way gets into the combustor through first oxygen regulating valve and blast pipe way, and another way gets into buggy conveying pipeline through second oxygen regulating valve for the buggy of carrying in the boosting buggy conveying pipeline, the combustion-supporting wind in the blast pipe way mixes the back with the buggy in the buggy conveying pipeline in getting into the combustor, through flexible pipe in the combustor, is sent into the burning in the chain grate rotary kiln. After the combustion-supporting air with the oxygen is introduced to enrich the oxygen, the air quantity of the combustion-supporting air can be reduced, the flue gas quantity after combustion can be reduced, and the emission of pollutants is reduced, so that the configuration grade of environment-friendly equipment can be properly reduced on the premise of ensuring the emission condition, and the environment-friendly cost of enterprises is reduced; after the combustion-supporting air is enriched with oxygen, the combustion efficiency of the pulverized coal can be improved, the consumption of the pulverized coal is correspondingly reduced, the fuel cost for manufacturing pellets is reduced, and energy conservation and emission reduction are realized through the oxygen enrichment.
The utility model discloses can improve buggy combustion effect, reduce the energy consumption of whole production system, the emission of pollutant reduction, the combustion-supporting air system of grate rotary kiln adopts the oxygen boosting air blast, has improved the oxygen content of combustion-supporting wind, has realized the oxygen boosting burning of buggy, still can obviously improve the stability of buggy burning, reduces the phenomenon of putting out a fire by a wide margin, reduces the requirement to buggy volatile, has enlarged the selection and the application scope of raw coal.
The oxygen-enriched combustion of the coal powder can be widely applied to the coal powder combustion industries of pellet grate rotary kiln coal injection, lime rotary kiln coal injection, glass kiln coal injection and the like. The pulverized coal oxygen-enriched combustion can improve the pulverized coal combustion effect, improve the theoretical combustion temperature of the pulverized coal, improve the pulverized coal combustion performance, prolong the furnace life, improve the product yield and quality and have outstanding environmental protection effect.
Drawings
Fig. 1 is a system configuration diagram of the present invention.
In the figure: 1. the device comprises a combustor, 2, a pulverized coal pneumatic conveying device, 3, a combustion fan, 4, an oxygen generation system, 5, a controller, 6, a quick cut-off valve, 7, a first oxygen regulating valve, 8, a second oxygen regulating valve, 9, a fan regulating valve, 10, an oxygen diffusion valve, 11, an emptying pipe, 12, an oxygen conveying pipeline, 13, a wind supply pipeline, 14, a grate rotary kiln, 15, a pulverized coal conveying pipeline, 16 and a check valve.
Detailed Description
As shown in fig. 1, the utility model comprises a combustor 1, a pulverized coal pneumatic conveying device 2, a combustion fan 3, an oxygen generation system 4, a controller 5 and the like.
Burner 1 provides a high temperature heating source for firing pellets to grate rotary kiln 14. The pulverized coal pneumatic conveying device 2 is connected with the combustor 1 through a pulverized coal conveying pipeline 15 and is used for conveying pulverized coal serving as fuel to the combustor 1. The coal powder conveying pipeline 15 is connected with a check valve 16 to prevent the backflow of oxygen in the coal powder conveying pipeline 15 and ensure the oxygen introduction safety. The combustion fan 3 is connected with the combustor 1 through an air supply pipeline 13 and is used for providing combustion air for the combustor 1. A fan regulating valve 9 is connected to the air supply pipeline 13 to control the amount of air supplied to the burner.
The oxygen generation system 4 is an existing shaping system, is respectively connected with the air supply pipeline 13 and the coal powder conveying pipeline 15 through the oxygen conveying pipeline 12, and is used for respectively providing oxygen for the combustor 1 and the coal powder conveying pipeline 2. A first oxygen regulating valve 7 is connected to an oxygen delivery line 12 connected to the blast line 13, and a second oxygen regulating valve 8 is connected to the oxygen delivery line 12 connected to the pulverized coal delivery line 15, respectively, to control the amount of oxygen delivered. Still connect a blow-down pipe 11 on communicating oxygen conveying line 15 with system oxygen system, connect oxygen blow-down valve 10 on blow-down pipe 11 to discharge the unnecessary oxygen of system oxygen 4 output, thereby guarantee system safety.
The controller 5 is electrically connected to the control end of the fan regulating valve 9, the control end of the first oxygen regulating valve 7, the control end of the second oxygen regulating valve 8, and the control end of the oxygen bleeding valve 10, and is configured to control the opening of the fan regulating valve 9, the opening of the first oxygen regulating valve 7, and the opening of the second oxygen regulating valve 8, and to control the opening and closing of the oxygen bleeding valve 10. The controller 5 can adopt a microprocessor or a singlechip system, and can also adopt a PLC. In addition, the controller 5 also sends a control instruction to the pulverized coal pneumatic conveying device 2 to control the operation of the pulverized coal pneumatic conveying device 2. The controller 5 may receive manual input of parametric information such as yield.
A first temperature sensor (not shown) is arranged in the grate rotary kiln 14, and the first temperature sensor is electrically connected with the controller 5 and sends a temperature signal of the grate rotary kiln to the controller 5 to provide adjusting basis for the controller to adjust the fan adjusting valve 9, the first oxygen adjusting valve 7 and the second oxygen adjusting valve 8.
In order to further ensure the safety of the system, a quick cut-off valve 6 is also arranged on the pulverized coal conveying pipeline 15, and the quick cut-off valve 6 is electrically connected with the controller 5. An oxygen content detection device (not shown) and a second temperature sensor (not shown) are installed in the pulverized coal conveying pipe 15. The oxygen content detection device and the second temperature sensor are respectively electrically connected with the controller 5 and used for sending an oxygen content signal and a temperature signal in the pulverized coal conveying pipeline 15 to the controller 5. When the oxygen content or the temperature in the coal powder conveying pipeline 15 exceeds the limit, the controller 5 sends an instruction, and the quick cut-off valve 6 is controlled to quickly cut off the coal powder conveying pipeline 15 so as to ensure the safety of the system.
Claims (3)
1. The utility model provides a grate rotary kiln pelletizing oxygen boosting coal injection system, characterized by includes:
the combustor provides a high-temperature heating source for sintering the pellets for the rotary kiln of the chain grate;
the pulverized coal pneumatic conveying device is connected with the combustor through a pulverized coal conveying pipeline and is used for conveying pulverized coal serving as fuel to the combustor; a check valve is connected on the pulverized coal conveying pipeline;
the combustion-supporting fan is connected with the combustor through an air supply pipeline and used for providing combustion-supporting air for the combustor; the air supply pipeline is connected with a fan regulating valve;
the oxygen generation system is respectively connected with the air supply pipeline and the coal powder conveying pipeline through an oxygen conveying pipeline and is used for providing oxygen for the combustor and the coal powder conveying pipeline; a first oxygen regulating valve is connected to the oxygen conveying pipeline connected with the air supply pipeline, and a second oxygen regulating valve is connected to the oxygen conveying pipeline connected with the pulverized coal conveying pipeline;
the controller is respectively and electrically connected with the control end of the fan regulating valve, the control end of the first oxygen regulating valve and the control end of the second oxygen regulating valve and is used for respectively controlling the opening degrees of the fan regulating valve, the first oxygen regulating valve and the second oxygen regulating valve; and
and the first temperature sensor is arranged in the rotary kiln of the chain grate machine, is electrically connected with the controller, and is used for sending a temperature signal of the rotary kiln of the chain grate machine to the controller so as to provide an adjusting basis for the controller to adjust the fan adjusting valve, the first oxygen adjusting valve and the second oxygen adjusting valve.
2. The grate rotary kiln pellet oxygen-enriched coal injection system of claim 1, further comprising:
the quick cut-off valve is arranged on the pulverized coal conveying pipeline, is electrically connected with the controller and is used for controllably cutting off the pulverized coal conveying pipeline when the oxygen content or the temperature in the pulverized coal conveying pipeline exceeds the limit;
the oxygen content detection device is arranged in the pulverized coal conveying pipeline, is electrically connected with the controller and is used for sending an oxygen content signal in the pulverized coal conveying pipeline to the controller; and
and the second temperature sensor is arranged in the pulverized coal conveying pipeline, is electrically connected with the controller and is used for sending a temperature signal in the pulverized coal conveying pipeline to the controller.
3. The grate rotary kiln pellet oxygen-enriched coal injection system of claim 1, further comprising:
the blow-down pipe is connected with an oxygen conveying pipeline communicated with the oxygen generating system, and the blow-down pipe is connected with an oxygen blow-down valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022819130.1U CN213687787U (en) | 2020-11-30 | 2020-11-30 | Grate rotary kiln pellet oxygen-enriched coal injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022819130.1U CN213687787U (en) | 2020-11-30 | 2020-11-30 | Grate rotary kiln pellet oxygen-enriched coal injection system |
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| Publication Number | Publication Date |
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| CN213687787U true CN213687787U (en) | 2021-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022819130.1U Active CN213687787U (en) | 2020-11-30 | 2020-11-30 | Grate rotary kiln pellet oxygen-enriched coal injection system |
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| Country | Link |
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| CN (1) | CN213687787U (en) |
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- 2020-11-30 CN CN202022819130.1U patent/CN213687787U/en active Active
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