Lime kiln tail gas recycling device

Abstract

The utility model relates to the technical field of lime kiln tail gas recycling, in particular to a lime kiln tail gas recycling device which comprises a lime kiln, a high-voltage frequency conversion fan, a first dust remover, a drying kiln and a second dust remover. An air conveying pipeline is communicated between the high-voltage frequency conversion fan and the boiling cooling air distribution chamber, a lime kiln tail gas conveying pipeline is communicated between the top of the first dust remover and the air conveying pipeline, and a second tail gas dust removal pipeline is fixedly communicated between a top outlet of the drying kiln and an inlet of the second dust remover. And an outlet of the second dust remover is fixedly communicated with a drying kiln tail gas emission pipeline. The lime kiln tail gas recycling device is reasonable and compact in structure and convenient to use, can recycle tail gas discharged by a lime kiln, reduces the smoke discharge amount, solves the problem that the oxygen content does not reach the standard in the carbon material drying process of a drying kiln, improves the field operation environment, and has the advantages of being safe, labor-saving, simple, convenient and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of lime kiln tail gas recovery, in particular to a lime kiln tail gas recovery and utilization device. Background Art

[0002] The first stage of the drying kiln process is the chemical reaction of the fuel burning in the boiling furnace. Air is used as a combustion aid and produces hot air at about 850°C after combustion. The generated hot air is directly introduced into the drying tower, which can cause the charcoal to spontaneously combust (the spontaneous combustion point of charcoal is 320°C). Therefore, in the second stage of drying, the high-temperature flue gas generated by the boiling furnace must be cooled down.

[0003] The drying kiln currently needs to be equipped with 80,000 to 100,000 cubic meters of air to cool the high-temperature flue gas (850°C to 1100°C) and reduce the temperature to below 280°C (500°C for high-temperature kilns). The air supplied to the drying kiln in the second stage only serves to reduce the temperature and increase the air volume during the drying process, and the cooling air accounts for more than 90%. Since a large amount of air is used as cooling air, the oxygen content of the drying kiln exhaust exceeds the standard, and the current average is about 20.2% (the indicator requires the oxygen content to be no higher than 18.0%). Summary of the invention

[0004] The utility model provides a lime kiln tail gas recovery and utilization device, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of resource waste in lime kiln tail gas emission and excessive oxygen content in the drying kiln tail gas in the existing drying kiln process.

[0005] The technical scheme of the utility model is realized by the following measures: a lime kiln tail gas recovery and utilization device, comprising a lime kiln, a high-pressure variable frequency fan, a first dust collector, a drying kiln and a second dust collector, a tail gas discharge port is arranged on the top of the lime kiln, a boiling cooling air distribution chamber is arranged inside the drying kiln, a lime input pipeline is fixedly connected to the upper inlet of the lime kiln, a first hot air inlet pipeline is fixedly connected to the lower inlet of the lime kiln, a lime discharge pipeline is fixedly connected to the bottom outlet of the lime kiln, a first tail gas discharge pipeline is fixedly connected between the tail gas discharge port and the inlet of the first dust collector Dust pipeline, an air delivery pipeline is fixedly connected between the outlet of the high-pressure variable frequency fan and the inlet of the boiling cooling air distribution chamber, a lime kiln exhaust gas delivery pipeline is fixedly connected between the top outlet of the first dust collector and the air delivery pipeline, a feed pipeline is fixedly connected to the top inlet of the drying kiln, a second hot air inlet pipeline is fixedly connected to the lower inlet of the drying kiln, a second exhaust gas dust removal pipeline is fixedly connected between the top outlet of the drying kiln and the inlet of the second dust collector, the outlet of the second dust collector is fixedly connected to the drying kiln exhaust gas emission pipeline, and the bottom outlet of the drying kiln is fixedly connected to a drying discharge pipeline.

[0006] The following are further optimizations and / or improvements to the above utility model technical solution:

[0007] The first dust collector and the second dust collector are both bag dust collectors.

[0008] A first remote thermometer is arranged on the above-mentioned lime kiln tail gas transmission pipeline.

[0009] A second remote thermometer is arranged on the air delivery pipeline between the lime kiln tail gas delivery pipeline and the drying kiln.

[0010] The above also includes a controller, and the first remote thermometer, the second remote thermometer and the high-voltage variable frequency fan are electrically connected to the controller.

[0011] The utility model has a reasonable and compact structure and is easy to use. It can recycle the exhaust gas emitted by the lime kiln, reduce the smoke emission, solve the problem of substandard oxygen content in the process of drying carbon materials in the drying kiln, improve the on-site working environment, and has the characteristics of safety, labor saving, simplicity and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 This is a schematic diagram of the process flow of the utility model.

[0013] Attached Figure 1 The codes are as follows: 1 for lime kiln, 2 for high-pressure variable frequency fan, 3 for the first dust collector, 4 for drying kiln, 5 for the second dust collector, 6 for lime input pipeline, 7 for the first hot air inlet pipeline, 8 for lime discharge pipeline, 9 for the first tail gas dust removal pipeline, 10 for air delivery pipeline, 11 for lime kiln tail gas delivery pipeline, 12 for feed pipeline, 13 for the second hot air inlet pipeline, 14 for the second tail gas dust removal pipeline, 15 for drying kiln tail gas discharge pipeline, 16 for drying discharge pipeline, 17 for the first remote thermometer, 18 for the second remote thermometer, and 19 for boiling cooling air distribution chamber. DETAILED DESCRIPTION

[0014] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0015] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0017] The present invention is further described below in conjunction with the embodiments and drawings:

[0018] Embodiment 1: As attached Figure 1 As shown, the tail gas recovery and utilization device of the lime kiln 1 comprises a lime kiln 1, a high-pressure variable frequency fan 2, a first dust collector 3, a drying kiln 4 and a second dust collector 5. The top of the lime kiln 1 is provided with a tail gas discharge port, the drying kiln 4 is provided with a boiling cooling air distribution chamber 19, the upper inlet of the lime kiln 1 is fixedly connected with a lime input pipeline 6, the lower inlet of the lime kiln 1 is fixedly connected with a first hot air inlet pipeline 7, the bottom outlet of the lime kiln 1 is fixedly connected with a lime discharge pipeline 8, the tail gas discharge port and the inlet of the first dust collector 3 are fixedly connected with a first tail gas dust removal pipeline 9, the outlet of the high-pressure variable frequency fan 2 is connected with An air delivery pipeline 10 is fixedly connected between the inlet of the boiling cooling air distribution chamber 19, a lime kiln exhaust gas delivery pipeline 11 is fixedly connected between the top outlet of the first dust collector 3 and the air delivery pipeline 10, a feed pipeline 12 is fixedly connected to the top inlet of the drying kiln 4, a second hot air inlet pipeline 13 is fixedly connected to the lower inlet of the drying kiln 4, a second exhaust gas dust removal pipeline 14 is fixedly connected between the top outlet of the drying kiln 4 and the inlet of the second dust collector 5, a drying kiln exhaust gas discharge pipeline 15 is fixedly connected to the outlet of the second dust collector 5, and a drying discharge pipeline 16 is fixedly connected to the bottom outlet of the drying kiln 4.

[0019] The utility model can transport the tail gas of the lime kiln 1 to the boiling cooling air distribution chamber 19 of the drying kiln 4, effectively utilize the tail gas of the lime kiln 1 (about 60°C) as the fume cooling air distribution chamber of the drying kiln 4, and dry the carbon materials in the drying kiln 4. After continuously introducing the lime tail gas (oxygen content 11%), the fume content of the drying kiln 4 can be reduced from 20.2% to below 17%, or even lower, thereby effectively recycling the tail gas discharged from the lime kiln 1, reducing the fume emission and improving the working environment.

[0020] The above-mentioned tail gas recovery and utilization device of the lime kiln 1 can be further optimized and / or improved according to actual needs:

[0021] Embodiment 2: It is different from Embodiment 1 in that: Figure 1 As shown, the first dust collector 3 and the second dust collector 5 are both bag dust collectors.

[0022] Embodiment 3: It differs from Embodiment 1 to Embodiment 2 in that: Figure 1 As shown, a drying discharge pipeline 17 is provided on the lime kiln tail gas conveying pipeline 11 .

[0023] Embodiment 4: It differs from Embodiments 1 to 3 in that: Figure 1 As shown, a second remote thermometer 18 is provided on the air delivery pipeline 10 between the lime kiln tail gas delivery pipeline 11 and the drying kiln 4 .

[0024] Embodiment 5: It differs from Embodiments 1 to 3 in that: Figure 1As shown, a controller is also included, and the drying discharge pipeline 17, the second remote thermometer 18 and the high-pressure variable frequency fan 2 are electrically connected to the controller.

[0025] According to the needs, the pipelines and equipment of the tail gas recovery and utilization device of the lime kiln 1 can also be provided with conventional valves, thermometers and pressure gauges known in the art according to the production needs. The model of the DCS controller can be the CS3000 controller produced by Yokogawa Corporation of Japan.

[0026] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A lime kiln tail gas recovery and utilization device, characterized in that The utility model comprises a lime kiln, a high-pressure variable frequency fan, a first dust collector, a drying kiln and a second dust collector. An exhaust gas discharge port is arranged on the top of the lime kiln, a boiling cooling air distribution chamber is arranged inside the drying kiln, an upper inlet of the lime kiln is fixedly connected with a lime input pipeline, a lower inlet of the lime kiln is fixedly connected with a first hot air inlet pipeline, a bottom outlet of the lime kiln is fixedly connected with a lime discharge pipeline, a first exhaust gas dust removal pipeline is fixedly connected between the exhaust gas discharge port and the inlet of the first dust collector, an air conveying pipeline is fixedly connected between the outlet of the high-pressure variable frequency fan and the inlet of the boiling cooling air distribution chamber, a lime kiln exhaust gas conveying pipeline is fixedly connected between the top outlet of the first dust collector and the air conveying pipeline, a feed pipeline is fixedly connected between the top inlet of the drying kiln, a second hot air inlet pipeline is fixedly connected at the lower inlet of the drying kiln, a second exhaust gas dust removal pipeline is fixedly connected between the top outlet of the drying kiln and the inlet of the second dust collector, a drying kiln exhaust gas discharge pipeline is fixedly connected at the outlet of the second dust collector, and a drying discharge pipeline is fixedly connected at the bottom outlet of the drying kiln.

2. The lime kiln tail gas recovery and utilization device according to claim 1, characterized in that The first dust collector and the second dust collector are both bag dust collectors.

3. The lime kiln tail gas recovery and utilization device according to claim 1 or 2, characterized in that A first remote thermometer is arranged on the lime kiln tail gas transmission pipeline.

4. The lime kiln tail gas recovery and utilization device according to claim 1 or 2, characterized in that A second remote thermometer is arranged on the air conveying pipeline between the lime kiln tail gas conveying pipeline and the drying kiln.

5. The lime kiln tail gas recovery and utilization device according to claim 3, characterized in that A second remote thermometer is arranged on the air conveying pipeline between the lime kiln tail gas conveying pipeline and the drying kiln.

6. The lime kiln tail gas recovery and utilization device according to claim 3, characterized in that It also includes a controller, and the first remote thermometer, the second remote thermometer and the high-voltage variable frequency fan are electrically connected to the controller.

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