Coal mine gas oxidation coupled coal gangue pyrolysis system

Abstract

The utility model provides a kind of coal mine gas oxidation coupling coal gangue pyrolysis system, belong to the technical field of coal mine waste comprehensive management and energy recovery, including gas oxidation device, tail gas incinerator, flue gas mixer, indirect heating rotary kiln and cyclone dust collector;The heat generated by gas oxidation realizes coal gangue pyrolysis treatment, reduces greenhouse gas emission at the same time, realizes coal gangue, coal mine gas harmless treatment and resource utilization, can effectively improve the problem of low efficiency of independent processing of ultra-low concentration coal mine gas and coal gangue, energy waste, low return on investment.

Description

Technical Field

[0001] This utility model belongs to the technical field of comprehensive treatment and energy recovery of coal mine waste, and specifically discloses a coal mine gas oxidation coupled coal gangue pyrolysis system. Background Technology

[0002] Coal gangue is a solid waste generated during coal mining and washing. Long-term accumulation can easily lead to spontaneous combustion, dust pollution, acidic water seepage, and heavy metal migration. Existing treatment methods (landfill, building materials, etc.) are costly and pose a risk of secondary pollution. Direct emissions of coal mine gas (mainly CH4) contribute to the greenhouse effect, and traditional utilization methods (such as power generation and heating) are expensive and inefficient. Currently, there is no technology that combines ultra-low concentration coal mine gas oxidation with coal gangue treatment, resulting in low efficiency, energy waste, and low return on investment for the independent treatment of these two pollutants. Utility Model Content

[0003] This invention provides a coal mine gas oxidation coupled with coal gangue pyrolysis system to improve the problems of low efficiency, energy waste, and low return on investment in the independent treatment of ultra-low concentration coal mine gas and coal gangue.

[0004] The aforementioned coal mine gas oxidation coupled coal gangue pyrolysis system includes a gas oxidation unit, a tail gas incinerator, a flue gas mixer, an indirect heating rotary kiln, and a cyclone dust collector. The gas oxidation unit is equipped with an air inlet, a low-temperature exhaust port, and a high-temperature exhaust port. The tail gas incinerator is equipped with an air inlet I, an air inlet II, and an exhaust port. The flue gas mixer is equipped with a high-temperature air inlet, a low-temperature air inlet, and an exhaust port. The indirect heating rotary kiln is equipped with a rotary kiln feed port, a rotary kiln exhaust port, a rotary kiln slag discharge port, a heat exchanger air inlet, and a heat exchanger exhaust port. The cyclone dust collector is equipped with an air inlet, an exhaust port, and a slag discharge port. The air inlet of the gas oxidation unit is... The inlet of ultra-low concentration coal mine gas has a low-temperature exhaust port connected to the atmosphere, and a high-temperature exhaust port connected to the inlet I of the tail gas incinerator; the rotary kiln feed port of the indirect heating rotary kiln is the coal gangue inlet, the rotary kiln exhaust port is connected to the cyclone dust collector inlet, the slag discharge port is the clean soil outlet, and the heat exchanger exhaust port is connected to the low-temperature inlet of the flue gas mixer; the exhaust port of the cyclone dust collector is connected to the tail gas incinerator inlet II, and the slag discharge port is the clean soil outlet; the exhaust port of the tail gas incinerator is connected to the high-temperature inlet of the flue gas mixer; and the exhaust port of the flue gas mixer is connected to the heat exchanger inlet of the indirect heating rotary kiln.

[0005] The aforementioned coal mine gas oxidation coupled coal gangue pyrolysis system also includes a blower; the blower is equipped with an air inlet and an exhaust outlet, the air inlet is connected to a pipeline for ultra-low concentration coal mine gas, and the exhaust outlet is connected to the air inlet of the gas oxidation device.

[0006] The aforementioned coal mine gas oxidation coupled coal gangue pyrolysis system also includes a flue gas circulation fan; the flue gas circulation fan is equipped with an air inlet and an exhaust outlet, the air inlet is connected to the exhaust outlet of the heat exchanger of the indirect heating rotary kiln, and the exhaust outlet is connected to the low-temperature air inlet of the flue gas mixer.

[0007] The aforementioned coal mine gas oxidation coupled coal gangue pyrolysis system also includes a chimney; the low-temperature exhaust port of the gas oxidation device is connected to the chimney; and the exhaust port of the heat exchanger of the indirect heating rotary kiln is connected to the air inlet of the flue gas circulation fan and the chimney, respectively.

[0008] The aforementioned coal mine gas oxidation coupled coal gangue pyrolysis system also includes a booster fan; the booster fan is equipped with an air inlet and an exhaust outlet, the air inlet is connected to the exhaust outlet of the cyclone dust collector, and the exhaust outlet is connected to the air inlet II of the tail gas incinerator.

[0009] Compared with existing technologies, it has the following beneficial effects: 1. The heat from gas oxidation is fully utilized and can be used year-round without being affected by the season, which can improve the utilization rate of oxidation equipment; 2. It solves the biggest bottleneck problem in coal gangue pyrolysis treatment—the heat energy source problem, significantly reduces the cost of coal gangue treatment, and greatly improves the economics of coal gangue pyrolysis treatment technology; 3. The clean soil produced after the pyrolysis treatment of coal gangue removes harmful components from the coal gangue to the greatest extent, while retaining fixed carbon and trace elements in the soil. Its composition is similar to that of wood ash, making it a high-quality soil amendment that makes full use of coal gangue. 4. This utility model provides a technical solution for the synergistic treatment of coal gangue and ultra-low concentration coal mine gas. The heat generated by the oxidation of the gas is used to achieve the pyrolysis treatment of coal gangue, while reducing greenhouse gas emissions. This achieves the harmless treatment and resource utilization of coal gangue and coal mine gas, which can effectively improve the problems of low efficiency, energy waste and low return on investment in the independent treatment of ultra-low concentration coal mine gas and coal gangue. Attached Figure Description

[0010] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a coal mine gas oxidation coupled with coal gangue pyrolysis system.

[0012] In the diagram: 1. Blower; 2. Gas oxidation device; 3. Tail gas incinerator; 4. Flue gas mixer; 5. Indirect heating rotary kiln; 6. Flue gas circulation fan; 7. Cyclone dust collector; 8. Chimney; 9. Booster fan. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0014] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should fall within the scope of the technical content disclosed in this utility model. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0015] This embodiment provides a coal mine gas oxidation coupled coal gangue pyrolysis system, including a blower 1, a gas oxidation device 2, a tail gas incinerator 3, a flue gas mixer 4, an indirect heating rotary kiln 5, a flue gas circulation fan 6, a cyclone dust collector 7, a chimney 8, and a booster fan 9. All of the above devices are existing technologies.

[0016] Blower 1 is equipped with an air inlet and an exhaust outlet.

[0017] The gas oxidation device 2 is equipped with an air inlet, a low-temperature exhaust port and a high-temperature exhaust port.

[0018] The exhaust gas incinerator 3 is equipped with an air inlet I, an air inlet II, and an exhaust outlet.

[0019] The flue gas mixer 4 is equipped with a high-temperature air inlet, a low-temperature air inlet, and an exhaust outlet.

[0020] The indirect heating rotary kiln 5 is equipped with a rotary kiln feed inlet, a rotary kiln exhaust outlet, a rotary kiln slag discharge outlet, a heat exchanger air inlet, and a heat exchanger exhaust outlet.

[0021] The flue gas circulation fan 6 is equipped with an air inlet and an exhaust outlet.

[0022] The cyclone dust collector 7 is equipped with an air inlet, an exhaust outlet, and a slag discharge outlet.

[0023] The booster fan 9 is equipped with an air inlet and an exhaust outlet.

[0024] The air inlet of blower 1 is connected to the pipeline of ultra-low concentration coal mine gas, and the exhaust port is connected to the air inlet of gas oxidation device 2.

[0025] The low-temperature exhaust port of the gas oxidation device 2 is connected to the chimney 8, and the high-temperature exhaust port is connected to the air inlet I of the tail gas incinerator 3. In this embodiment, the concentration of oxidized gas is 1.2%.

[0026] The rotary kiln 5 with indirect heating has a rotary kiln feed port that is the inlet of coal gangue, a rotary kiln exhaust port that is connected to the air inlet of cyclone dust collector 7, a slag discharge port that is the outlet of clean soil, and a heat exchanger exhaust port that is connected to the air inlet of flue gas circulating fan 6 and chimney 8 respectively.

[0027] The exhaust port of the flue gas circulating fan 6 is connected to the low-temperature air inlet of the flue gas mixer 4.

[0028] The exhaust port of the cyclone dust collector 7 is connected to the air inlet of the booster fan 9, and the slag discharge port is the clean soil outlet.

[0029] The exhaust port of the booster fan 9 is connected to the air inlet II of the tail gas incinerator 3.

[0030] The exhaust port of the tail gas incinerator 3 is connected to the high-temperature air inlet of the flue gas mixer 4; The exhaust port of the flue gas mixer 4 is connected to the heat exchanger inlet of the indirect heating rotary kiln 5.

[0031] Ultra-low concentration methane is pressurized by blower 1 and enters the methane oxidation device 2 for oxidation treatment, releasing heat. The methane is oxidized and decomposed into carbon dioxide and water vapor, becoming flue gas. 75%~80% of the low-temperature flue gas is discharged from the low-temperature exhaust port of the methane oxidation device 2 and goes to the chimney 8 for atmospheric emission; 20%~25% of the high-temperature flue gas is discharged from the high-temperature exhaust port of the methane oxidation device 2 and goes to the tail gas incinerator 3.

[0032] In the tail gas incinerator 3, the high-temperature flue gas from the gas oxidation unit 2 and the gangue pyrolysis gas from the cyclone dust collector 7 are mixed and burned. The combustible components in the gangue pyrolysis gas are burned to generate carbon dioxide and water vapor, producing high-temperature flue gas, all of which goes to the flue gas mixer 4.

[0033] In the flue gas mixer 4, the high-temperature flue gas from the tail gas incinerator 3 and part of the low-temperature flue gas from the indirect-heated rotary kiln 5 mix to form medium-temperature flue gas at a suitable temperature, which enters the heat exchanger inside the shell of the indirect-heated rotary kiln 5. The heat of the medium-temperature flue gas is used to heat the coal gangue material inside the indirect-heated rotary kiln 5, and after dissipating heat, it becomes low-temperature flue gas and is discharged from the indirect-heated rotary kiln 5. Part of the low-temperature flue gas discharged from the indirect-heated rotary kiln 5 is pressurized by the flue gas circulation fan 6 and sent to the flue gas mixer 4 to regulate the temperature of the medium-temperature flue gas, and the remainder is directly discharged into the atmosphere through the chimney 8.

[0034] In the indirect heating rotary kiln 5, the coal gangue material is gradually heated to 650°C, and the organic matter undergoes a pyrolysis reaction to generate coal gangue pyrolysis gas. The coal gangue pyrolysis gas, along with dust, is discharged from the rotary kiln exhaust port of the indirect heating rotary kiln 5 and enters the cyclone dust collector 7. The remaining coal gangue material after pyrolysis becomes clean soil and is discharged from the indirect heating rotary kiln 5 through the slag discharge port of the indirect heating rotary kiln 5.

[0035] In the cyclone dust collector 7, the coal gangue pyrolysis gas from the indirect heating rotary kiln 5 is separated along with the dust. The gaseous coal gangue pyrolysis gas is discharged from the exhaust port of the cyclone dust collector 7 and pressurized by the booster fan 9 before being sent to the tail gas incinerator 3. The dust is discharged from the slag discharge port at the bottom of the cyclone dust collector 7 and becomes clean soil.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coal mine gas oxidation coupled coal gangue pyrolysis system, comprising a gas oxidation device (2), a tail gas incinerator (3), a flue gas mixer (4), an indirect heating rotary kiln (5), and a cyclone dust collector (7). The gas oxidation device (2) is equipped with an air inlet, a low-temperature exhaust port and a high-temperature exhaust port; The tail gas incinerator (3) is provided with an air inlet I, an air inlet II and an exhaust outlet; The flue gas mixer (4) is provided with a high temperature inlet, a low temperature inlet and an exhaust outlet; The indirect heating rotary kiln (5) is provided with a rotary kiln feed inlet, a rotary kiln exhaust outlet, a rotary kiln slag discharge outlet, a heat exchanger air inlet, and a heat exchanger exhaust outlet. The cyclone dust collector (7) is provided with an air inlet, an exhaust outlet and a slag discharge outlet; Its features are, The gas oxidation device (2) has an air inlet for ultra-low concentration coal mine gas, a low temperature exhaust port connected to the atmosphere, and a high temperature exhaust port connected to the air inlet I of the tail gas incinerator (3). The rotary kiln feed port of the indirect heating rotary kiln (5) is the inlet of coal gangue, the rotary kiln exhaust port is connected to the air inlet of the cyclone dust collector (7), the slag discharge port is the clean soil outlet, and the heat exchanger exhaust port is connected to the low temperature air inlet of the flue gas mixer (4). The exhaust port of the cyclone dust collector (7) is connected to the air inlet II of the tail gas incinerator (3), and the slag discharge port is the clean soil outlet. The exhaust port of the tail gas incinerator (3) is connected to the high-temperature air inlet of the flue gas mixer (4); The exhaust port of the flue gas mixer (4) is connected to the heat exchanger inlet of the indirect heating rotary kiln (5).

2. The coal mine gas oxidation coupled coal gangue pyrolysis system according to claim 1, characterized in that, It also includes the blower (1); The blower (1) is equipped with an air inlet and an exhaust outlet. The air inlet is connected to the pipeline of ultra-low concentration coal mine gas, and the exhaust outlet is connected to the air inlet of the gas oxidation device (2).

3. The coal mine gas oxidation coupled coal gangue pyrolysis system according to claim 2, characterized in that, It also includes a flue gas recirculation fan (6); The flue gas circulating fan (6) is provided with an air inlet and an exhaust outlet. The air inlet is connected to the exhaust outlet of the heat exchanger of the indirect heating rotary kiln (5), and the exhaust outlet is connected to the low-temperature air inlet of the flue gas mixer (4).

4. The coal mine gas oxidation coupled coal gangue pyrolysis system according to claim 3, characterized in that, It also includes chimneys (8); The low-temperature exhaust port of the gas oxidation device (2) is connected to the chimney (8); The exhaust port of the heat exchanger of the indirect heating rotary kiln (5) is connected to the air inlet of the flue gas circulation fan (6) and the chimney (8).

5. The coal mine gas oxidation coupled coal gangue pyrolysis system according to claim 4, characterized in that, It also includes a booster fan (9); The booster fan (9) is equipped with an air inlet and an exhaust outlet. The air inlet is connected to the exhaust outlet of the cyclone dust collector (7), and the exhaust outlet is connected to the air inlet II of the tail gas incinerator (3).

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