Waste gas recycling device of Maerz lime kiln

Abstract

The utility model relates to the technical field of industrial waste gas recovery, in particular to a waste gas recycling device for a Maerz lime kiln, which comprises the Maerz lime kiln, a lime kiln dust remover, a drying kiln fluidized bed furnace, a vertical drying kiln and a drying kiln dust remover. A lime kiln waste gas pipeline is fixedly communicated between the top gas outlet end of the Maerz lime kiln and the gas inlet end of the lime kiln dust remover, and a first waste gas recovery pipeline is fixedly communicated between the gas outlet end of the lime kiln dust remover and the gas inlet end of the upper side of the air distribution chamber of the drying kiln fluidized bed furnace. A drying kiln gas supply pipeline is fixedly communicated between the gas outlet end of the fluidized bed furnace air distribution chamber and the gas inlet end of the vertical drying kiln, and a drying kiln waste gas pipeline is fixedly communicated between the gas outlet end of the vertical drying kiln and the gas inlet end of the drying kiln dust remover. The device is reasonable and compact in structure, reduces the oxygen content of the gas entering the air distribution chamber of the fluidized bed furnace of the drying kiln by recycling the tail gas of the Merz lime kiln, thereby reducing the oxygen content of the tail gas of the drying kiln, and has the characteristics of safety, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial waste gas recovery, and is a device for recovering and utilizing the waste gas of a Maerz lime kiln. Background Art

[0002] The industrial fluidized bed furnace body of the drying kiln consists of three parts: a combustion chamber, a secondary combustion chamber, and an air distribution chamber. The combustion chamber mainly consists of an air bed, an air box, air caps, a slag discharge pipe, etc. The carbonaceous particles with a particle size ≤ 3 mm after screening are transported to the powder bin at the top of the furnace through a closed pipeline, and are evenly sent into the fluidized bed furnace by a disc feeder to be mixed with the air and bottom slag ejected from the small holes of the air caps to form a fluidized bed, generating high-temperature flue gas required for drying the carbonaceous materials, generally controlled at 850 °C to 1100 °C. The high-temperature flue gas passes through the secondary combustion chamber and the air distribution chamber in sequence and then drops to 700 °C, contacting the carbonaceous materials to evaporate and separate their moisture. In this process, air needs to be introduced through the air distribution chamber to make the temperature of the air entering the dryer within 300 °C, so as to meet the normal temperature requirements of the vertical drying kiln. The industrial drying kiln and the fluidized bed furnace mainly carry out heat exchange between the preheated air and the materials, so that the moisture in the materials is evaporated and precipitated. In this process, the outside air entering the air distribution chamber of the fluidized bed furnace does not participate in combustion support, resulting in the oxygen content in the tail gas being about 19.5%, which does not meet the requirements of the "Emission Standard of Air Pollutants for Industrial Kilns" for the oxygen content in the tail gas. Summary of the Invention

[0003] The utility model provides a device for recovering and utilizing the waste gas of a Maerz lime kiln, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem of excessive oxygen content in the tail gas of the drying kiln in the existing production process.

[0004] The technical solution of the utility model is realized by the following measures: A device for recovering and utilizing the waste gas of a Maerz lime kiln includes a Maerz lime kiln, a lime kiln dust collector, a drying kiln fluidized bed furnace, a vertical drying kiln, and a drying kiln dust collector. A lime kiln waste gas pipeline is fixedly connected between the gas outlet end at the top of the Maerz lime kiln and the gas inlet end of the lime kiln dust collector. A first waste gas recovery pipeline is fixedly connected between the gas outlet end of the lime kiln dust collector and the upper gas inlet end of the air distribution chamber of the drying kiln fluidized bed furnace. A drying kiln air supply pipeline is fixedly connected between the gas outlet end of the air distribution chamber and the gas inlet end of the vertical drying kiln. A drying kiln waste gas pipeline is fixedly connected between the gas outlet end of the vertical drying kiln and the gas inlet end of the drying kiln dust collector. The gas outlet end of the drying kiln dust collector is fixedly connected with a drying kiln exhaust pipeline.

[0005] The following is a further optimization and / or improvement of the above technical solution of the utility model:

[0006] An induced draft fan for dust removal and a booster fan are fixedly installed on the waste gas recovery pipeline in sequence along the gas flow direction.

[0007] The above-mentioned waste gas recovery and utilization device of the Maerz lime kiln further includes a lime kiln exhaust chimney, and a lime kiln exhaust pipeline is fixedly connected between the first waste gas recovery pipeline between the dust removal induced draft fan and the pressure blower and the lime kiln exhaust chimney.

[0008] A pressure gauge and a first regulating valve are fixedly installed on the first waste gas recovery pipeline between the above-mentioned pressure blower and the air distribution chamber.

[0009] A second waste gas recovery pipeline is fixedly connected between the first waste gas recovery pipeline between the above-mentioned first regulating valve and the air distribution chamber and the air intake end on the lower side of the air distribution chamber. A second regulating valve is fixedly installed on the first waste gas recovery pipeline between the second waste gas recovery pipeline and the air distribution chamber, and a third regulating valve is fixedly installed on the second waste gas recovery pipeline.

[0010] A thermometer is fixedly installed on the drying kiln gas supply pipeline.

[0011] The structure of the utility model is reasonable and compact, and it is convenient to use. By recovering and utilizing the tail gas of the Maerz lime kiln, it reduces the oxygen content of the gas entering the air distribution chamber of the drying kiln and the fluidized bed furnace, thereby reducing the oxygen content of the tail gas of the drying kiln and achieving the standard discharge of the tail gas of the drying kiln. It has the characteristics of safety, labor saving, simplicity and high efficiency. Description of the Drawings

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

[0013] The codes in the drawings are respectively: 1 is the Maerz lime kiln, 2 is the lime kiln dust collector, 3 is the air distribution chamber, 4 is the vertical drying kiln, 5 is the drying kiln dust collector, 6 is the lime kiln waste gas pipeline, 7 is the first waste gas recovery pipeline, 8 is the drying kiln gas supply pipeline, 9 is the drying kiln waste gas pipeline, 10 is the drying kiln exhaust pipeline, 11 is the dust removal induced draft fan, 12 is the pressure blower, 13 is the lime kiln exhaust chimney, 14 is the lime kiln exhaust pipeline, 15 is the pressure gauge, 16 is the first regulating valve, 17 is the second waste gas recovery pipeline, 18 is the second regulating valve, 19 is the third regulating valve, 20 is the thermometer, and 21 is the drying kiln fluidized bed combustion chamber. Detailed Embodiments

[0014] The utility model is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solutions of the utility model and the actual situation.

[0015] In the utility model, unless otherwise specified, the equipment and devices used are the existing well-known and commonly used equipment and devices in the art. In the utility model, for the convenience of description, the description of the relative position relationship of each component is based on the layout mode of the attached Figure 1 drawings of the specification. For example, the positional relationships such as front, rear, upper, lower, left, and right are based on the attached Figure 1It is determined by the layout direction.

[0016] The following further describes the present utility model in conjunction with embodiments and the accompanying drawings:

[0017] Embodiment 1: As shown in the attached Figure 1 figure, the waste gas recovery and utilization device of the Maerz lime kiln includes a Maerz lime kiln 1, a lime kiln dust collector 2, a drying kiln fluidized bed furnace, a vertical drying kiln 4, and a drying kiln dust collector 5. A lime kiln waste gas pipeline 6 is fixedly connected between the top air outlet end of the Maerz lime kiln 1 and the air inlet end of the lime kiln dust collector 2. A first waste gas recovery pipeline 7 is fixedly connected between the air outlet end of the lime kiln dust collector 2 and the upper air inlet end of the air distribution chamber 3 of the drying kiln fluidized bed furnace. A drying kiln air supply pipeline 8 is fixedly connected between the air outlet end of the air distribution chamber 3 and the air inlet end of the vertical drying kiln 4. A drying kiln waste gas pipeline 9 is fixedly connected between the air outlet end of the vertical drying kiln 4 and the air inlet end of the drying kiln dust collector 5. A drying kiln exhaust pipeline 10 is fixedly connected to the air outlet end of the drying kiln dust collector 5.

[0018] According to actual needs, the above waste gas recovery and utilization device of the Maerz lime kiln can be further optimized and / or improved:

[0019] Embodiment 2: The difference from Embodiment 1 is that: as shown in the attached Figure 1 figure, a dust removal induced draft fan 11 and a pressure boosting fan 12 are fixedly installed in sequence along the gas flow direction on the first waste gas recovery pipeline 7.

[0020] Embodiment 3: The difference from Embodiments 1 to 2 is that: as shown in the attached Figure 1 figure, the waste gas recovery and utilization device of the Maerz lime kiln further includes a lime kiln exhaust chimney 13. A lime kiln exhaust pipeline 14 is fixedly connected between the first waste gas recovery pipeline 7 between the dust removal induced draft fan 11 and the pressure boosting fan 12 and the lime kiln exhaust chimney 13.

[0021] Embodiment 4: The difference from Embodiments 1 to 2 is that: as shown in the attached Figure 1 figure, a pressure gauge 15 and a first regulating valve 16 are fixedly installed on the first waste gas recovery pipeline 7 between the pressure boosting fan 12 and the air distribution chamber 3.

[0022] Embodiment 5: The difference from Embodiments 1 to 3 is that: as shown in the attached Figure 1 figure, a second waste gas recovery pipeline 17 is fixedly connected between the first waste gas recovery pipeline 7 between the first regulating valve 16 and the air distribution chamber 3 and the lower air inlet end of the air distribution chamber 3. A second regulating valve 18 is fixedly installed on the first waste gas recovery pipeline 7 between the second waste gas recovery pipeline 17 and the air distribution chamber 3. A third regulating valve 19 is fixedly installed on the second waste gas recovery pipeline 17.

[0023] Embodiment 6: The difference from Embodiments 1 to 4 is that: as shown in the attached Figure 1As shown, a thermometer 20 is fixedly installed on the drying kiln gas supply pipeline 8.

[0024] As required, valves, thermometers, pressure gauges, etc. that can make it operate normally are fixedly installed on each pipeline of the Meirz lime kiln waste gas recycling device.

[0025] The utility model utilizes the characteristic that the oxygen content in the tail gas of the Meirz lime kiln after dust removal (the original treatment method was to directly discharge it into the atmosphere after dust removal) is relatively low (about 10%). The tail gas of the Meirz kiln is transported to the air distribution chamber of the drying kiln boiling furnace through pipelines, and the temperature of the Meirz kiln tail gas entering the drying kiln is adjusted and controlled to reduce the oxygen content entering the drying kiln, so as to achieve the standard discharge of the drying kiln tail gas.

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

Claims

1. A Maerz lime kiln waste gas recovery and utilization device, characterized in that It includes a Maerz lime kiln, a lime kiln dust collector, a drying kiln fluidized bed furnace, a vertical drying kiln and a drying kiln dust collector. A lime kiln exhaust gas pipeline is fixedly connected between the air outlet end of the top of the Maerz lime kiln and the air inlet end of the lime kiln dust collector, a first exhaust gas recovery pipeline is fixedly connected between the air outlet end of the lime kiln dust collector and the upper air inlet end of the air distribution chamber of the drying kiln fluidized bed furnace, a drying kiln air supply pipeline is fixedly connected between the air outlet end of the air distribution chamber and the air inlet end of the vertical drying kiln, a drying kiln exhaust gas pipeline is fixedly connected between the air outlet end of the vertical drying kiln and the air inlet end of the drying kiln dust collector, and a drying kiln exhaust pipeline is fixedly connected between the air outlet end of the drying kiln dust collector.

2. The Maerz lime kiln waste gas recovery and utilization device according to claim 1 is characterized in that A dust removal induced draft fan and a pressure fan are fixedly installed in sequence on the exhaust gas recovery pipeline along the air flow direction.

3. The Maerz lime kiln waste gas recovery and utilization device according to claim 2 is characterized in that It also includes a lime kiln exhaust chimney, and a lime kiln exhaust pipeline is fixedly connected between the first exhaust gas recovery pipeline between the dust removal induced draft fan and the pressure fan and the lime kiln exhaust chimney.

4. The Maerz lime kiln waste gas recovery and utilization device according to claim 2 or 3, characterized in that A pressure gauge and a first regulating valve are fixedly installed on the first exhaust gas recovery pipeline between the booster fan and the air distribution chamber.

5. The Maerz lime kiln waste gas recovery and utilization device according to claim 4 is characterized in that A second exhaust gas recovery pipeline is fixedly connected between the first exhaust gas recovery pipeline between the first regulating valve and the air distribution chamber and the air inlet end at the lower side of the air distribution chamber, a second regulating valve is fixedly installed on the first exhaust gas recovery pipeline between the second exhaust gas recovery pipeline and the air distribution chamber, and a third regulating valve is fixedly installed on the second exhaust gas recovery pipeline.

6. The Maerz lime kiln waste gas recovery and utilization device according to claim 1, 2, 3, 4 or 5, characterized in that A thermometer is fixedly installed on the air supply pipeline of the drying kiln.

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