Coal mine gas heat storage catalytic oxidation wellhead hot air supply system

Abstract

The invention belongs to the technical field of gas oxidation heat recycling, and particularly relates to a coal mine gas heat storage catalytic oxidation wellhead hot air supply system which comprises a heat storage type catalytic oxidation device used for catalytic oxidation of gas. The regenerative chamber of the regenerative catalytic oxidation device is filled with the regenerative catalytic ceramic body, and the regenerative catalytic ceramic body is coated with a catalyst. Coal mine gas discharged by a coal mine is treated through the heat storage catalytic oxidation device, meanwhile, a large amount of heat is recycled while the coal mine gas is treated, high-temperature hot air is prepared and supplied to a coal mine air shaft and used for keeping warm in winter, an original electric heating device and an original gas-fired boiler device of the coal mine are replaced, a large amount of energy consumption is saved, and the coal production cost is greatly reduced; meanwhile, the gas discharged in an empty mode is turned into wealth, energy conservation and emission reduction are achieved, the environment is protected, and the problems that at the present stage, a coal mine gas treatment mode is unreasonable, energy consumption is large, and pollution can be caused are solved.

Description

Technical Field

[0001] The invention relates to the technical field of gas oxidation heat recovery and utilization, and in particular to a coal mine gas heat storage catalytic oxidation wellhead hot air supply system. Background Art

[0002] Coalbed gas, also known as coal-bed methane, is a mixed gas composed of methane, carbon dioxide and nitrogen that escapes from coal and surrounding rocks. Gas is a harmful factor in coal mining production. It not only pollutes the air, but also causes explosions and accidents when the gas content in the air is 5% to 16%.

[0003] Coal mine gas is divided into extraction gas and ventilation gas (also known as wind exhaust gas, exhaust gas). Extraction gas refers to the gas in unmined coal seams or goafs in coal mines that is directly sucked to the ground by drilling holes or special extraction tunnels, pipelines, vacuum pumps, etc.; ventilation gas refers to the exhaust gas (also known as exhaust gas) generated in the ventilation of coal mine tunnels, and its methane concentration is less than 0.75%; these two parts of gas concentration above 8% are usually used for internal combustion engine power generation or purification for civilian use; and most coal mines currently discharge the part with a gas concentration of less than 8% into the atmosphere, which is a waste, which not only causes waste, but also causes environmental pollution, and even worse, it may cause safety hazards and explosions. At this stage, coal mines cannot realize the recovery and reuse of gas to keep the wellhead warm in winter. Therefore, the present invention proposes a coal mine gas heat storage catalytic oxidation wellhead heating air system to solve this problem. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a coal mine gas heat storage catalytic oxidation wellhead hot air supply system, which treats the coal mine gas discharged from the coal mine through a heat storage catalytic oxidation device, and at the same time recovers a large amount of heat while treating the coal mine gas to produce high-temperature hot air to supply the coal mine air shaft for keeping warm in winter, replacing the original electric heating device and gas boiler device in the coal mine, saving a lot of energy consumption, greatly reducing the cost of coal production, and at the same time turning the discharged gas into treasure, achieving energy conservation and emission reduction, protecting the environment, and solving the problems of unreasonable coal mine gas treatment methods at this stage, high energy consumption, and pollution.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0008] A coal mine gas heat storage catalytic oxidation wellhead hot air supply system, comprising

[0009] Regenerative catalytic oxidation device, used for catalytic oxidation of gas;

[0010] The heat storage catalytic ceramic body is filled in the heat storage chamber of the heat storage catalytic oxidation device, and the heat storage catalytic ceramic body is coated with a catalyst;

[0011] The waste heat recovery system includes a waste heat boiler, a flue gas heat exchange pipe, a heat exchange box and a fresh air heat exchange pipe. The flue gas heat exchange pipe is fixed inside the waste heat boiler, and one end of the flue gas heat exchange pipe extends to the outside of the waste heat boiler and is connected to the high-temperature flue gas pipe on the upper part of the heat storage catalytic oxidation device, and a low-pressure steam pipe is connected between the exhaust port of the waste heat boiler and the air inlet of the heat exchange box. The fresh air heat exchange pipe is fixed on the inner side of the heat exchange box, and the air inlet end of the fresh air heat exchange pipe extends to the outside of the heat exchange box and is connected to the fresh air pipe. The exhaust port of the fresh air heat exchange pipe is connected to the heating pipe, and the heating pipe realizes the heating of the air inlet of the coal mine air shaft.

[0012] Furthermore, a hot air blower is installed on the heating pipe.

[0013] Furthermore, it also includes a steam condensate recovery tank, and a condensate recovery pipeline is arranged between the heat exchange box and the steam condensate recovery tank.

[0014] Furthermore, one end of the flue gas heat exchange pipe away from the high-temperature flue gas duct extends to the outside of the waste heat boiler and is connected to a low-temperature hot air duct, on which a high-temperature valve and a boiler fan are respectively installed.

[0015] Furthermore, one side of the waste heat boiler is connected to a water supply pipe, and a water pump is installed on the water supply pipe.

[0016] Furthermore, the air inlet chamber at the bottom of the regenerative catalytic oxidation device is respectively connected to a gas inlet pipe and an exhaust gas pipe, wherein the gas inlet pipe is provided with a high-pressure centrifugal fan, and the gas inlet pipe passes the gas into the regenerative catalytic oxidation device for catalytic oxidation through the high-pressure centrifugal fan, and an electric shut-off valve is installed on the exhaust gas pipe, and switching valve groups are provided on both the gas inlet pipe and the exhaust gas pipe.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a coal mine gas heat storage catalytic oxidation wellhead hot air supply system, which has the following beneficial effects:

[0019] 1. The present invention provides a waste heat recovery system, which is mainly composed of a waste heat boiler and a heat exchange box, wherein a flue gas heat exchange pipe is installed in the waste heat boiler, and the flue gas heat exchange pipe is of disc design. When in use, the high-temperature gas in the heat storage catalytic oxidation device is discharged into the flue gas heat exchange pipe through the high-temperature flue gas pipe, so as to achieve heating of the waste heat boiler and generate steam, and the steam enters the heat exchange box through the low-pressure steam pipe, and a fresh air heat exchange pipe is arranged in the heat exchange box, and the two ends of the fresh air heat exchange pipe are respectively connected with the fresh air pipe and the heating pipe, so as to achieve heating of the fresh air through steam, and transmit the formed hot gas to the air inlet of the coal mine wind shaft, so as to achieve heating at the wellhead in winter, and no electric heating is needed for heating, so as to save energy consumption, turn waste gas into treasure, realize resource recycling and reuse, and avoid the hidden dangers of environmental pollution and safety accidents.

[0020] 2. The present invention replaces the traditional heat storage body with a heat storage catalytic ceramic body coated with a catalyst. Due to the characteristics of the catalyst, the reaction temperature of the gas is greatly reduced, thereby allowing the gas to be rapidly oxidized, which can increase the utilization rate of the gas and make the oxidation effect more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flowchart of the present invention;

[0022] Figure 2 It is a flow chart of the waste heat recovery system in the present invention.

[0023] In the figure: 1. Regenerative catalytic oxidation device; 2. Regenerative catalytic ceramic body; 3. Gas intake pipe; 4. High-pressure centrifugal fan; 5. Exhaust pipe; 6. Electric shut-off valve; 7. Switching valve group; 8. Waste heat recovery system; 801. Waste heat boiler; 802. High-temperature flue gas pipe; 803. Flue gas heat exchange pipe; 804. Water pump; 805. Water supply pipe; 806. High-temperature valve; 807. Low-temperature hot air pipe; 808. Boiler fan; 809. Fresh air pipe; 8010. Low-pressure steam pipe; 8011. Heat exchange box; 8012. Steam condensate recovery box; 8013. Fresh air heat exchange pipe; 8014. Hot air blower; 8015. Heating pipe; 8016. Air inlet of coal mine air shaft. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example

[0026] like Figure 1 and Figure 2 As shown, a coal mine gas heat storage catalytic oxidation wellhead hot air supply system proposed in one embodiment of the present invention includes a heat storage catalytic oxidation device 1, which is used for catalytic oxidation of gas; a heat storage catalytic ceramic body 2, which is filled in the heat storage chamber of the heat storage catalytic oxidation device 1, and the heat storage catalytic ceramic body 2 is coated with a catalyst. By coating the catalyst on the heat storage catalytic ceramic body 2, the setting of the catalyst can greatly reduce the reaction temperature of the gas, thereby making the gas oxidation more complete and improving the catalytic oxidation treatment effect; a waste heat recovery system 8, which realizes the recovery and utilization of the heat of gas oxidation, including waste heat recovery. The waste heat boiler 801, the flue gas heat exchange pipe 803, the heat exchange box 8011 and the fresh air heat exchange pipe 8013 are fixed to the inside of the waste heat boiler 801, and one end of the flue gas heat exchange pipe 803 extends to the outside of the waste heat boiler 801 and is connected to the high-temperature flue gas pipeline 802 on the upper part of the regenerative catalytic oxidation device 1, so that the high-temperature gas generated by the regenerative catalytic oxidation device 1 enters the flue gas heat exchange pipe 803 through the high-temperature flue gas pipeline 802, so that the high-temperature flue gas of about 950° enters the flue gas heat exchange pipe 803 in the waste heat boiler 801, and there is high-temperature hot gas in the flue gas heat exchange pipe 803, and then passes The over-temperature flue gas heats the environment inside the waste heat boiler 801, and the flue gas temperature is reduced from 950° to 120°. A low-pressure steam pipe 8010 is connected between the exhaust port of the waste heat boiler 801 and the air inlet of the heat exchange box 8011, so that the steam in the waste heat boiler 801 enters the heat exchange box 8011 through the low-pressure steam pipe 8010 to achieve gas heat exchange. The fresh air heat exchange pipe 8013 is fixed to the inner side of the heat exchange box 8011, and the air inlet end of the fresh air heat exchange pipe 8013 extends to the outer side of the heat exchange box 8011 and is connected to the fresh air pipe 809. When the outside air passes through When the fresh air duct 809 enters into the fresh air heat exchange pipe 8013, the gas can be heated by high-temperature steam. In winter, the gas can be heated to -20°C and 70° hot air can be generated. The exhaust port of the fresh air heat exchange pipe 8013 is connected to the heating pipe 8015. The heating pipe 8015 realizes the heating of the coal mine air shaft air inlet 8016. The 70° hot air is discharged into the coal mine air shaft air inlet 8016, thereby realizing the heating of the coal mine air shaft air inlet 8016 and preventing the air inlet wellhead from freezing. No electric heating is required, thereby achieving the purpose of energy saving and emission reduction.

[0027] like Figure 2 As shown, in some embodiments, a hot air blower 8014 is installed on the heating pipe 8015 to achieve the circulation of hot air.

[0028] like Figure 2As shown, in some embodiments, a steam condensate recovery tank 8012 is also included, and a condensate recovery pipe is provided between the heat exchange box 8011 and the steam condensate recovery tank 8012; it should be noted that the steam in the heat exchange box 8011 is liquefied when cooled, and the liquefied water enters the steam condensate recovery tank 8012 through the condensate recovery pipe.

[0029] like Figure 2 As shown, in some embodiments, the flue gas heat exchange pipe 803 extends from one end of the high-temperature flue gas duct 802 to the outside of the waste heat boiler 801 and is connected to a low-temperature hot air duct 807, on which a high-temperature valve 806 and a boiler fan 808 are respectively installed; the flue gas temperature is reduced from 950° to 120° in the flue gas heat exchange pipe 803 of the waste heat boiler 801, and the flue gas after cooling is discharged through the low-temperature hot air duct 807, and the high-temperature valve 806 and the boiler fan 808 are respectively installed on the low-temperature hot air duct 807 to achieve the discharge and control of the hot gas.

[0030] like Figure 2 As shown, in some embodiments, one side of the waste heat boiler 801 is connected to a water supply pipe 805 , and a water pump 804 is installed on the water supply pipe 805 to realize water supply to the waste heat boiler 801 .

[0031] like Figure 1 As shown, in some embodiments, a gas intake pipe 3 and an exhaust gas pipe 5 are respectively connected to the air intake chamber at the bottom of the regenerative catalytic oxidation device 1, wherein a high-pressure centrifugal fan 4 is provided on the gas intake pipe 3, and the gas intake pipe 3 passes the gas into the regenerative catalytic oxidation device 1 through the high-pressure centrifugal fan 4 for catalytic oxidation, and an electric shut-off valve 6 is installed on the exhaust gas pipe 5, and a switching valve group 7 is provided on both the gas intake pipe 3 and the exhaust gas pipe 5; it should be noted that the external gas can be discharged into the regenerative catalytic oxidation device 1 through the gas intake pipe 3 and the high-pressure centrifugal fan 4 for catalytic oxidation, and the exhaust gas pipe 5 discharges the low-temperature flue gas and discharges it into the chimney for treatment, and the switching valve group 7 is installed on the gas intake pipe 3 and the exhaust gas pipe 5 to achieve the control of airflow discharge and discharge.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coal mine gas thermal storage catalytic oxidation wellhead hot air supply system, characterized by: include A regenerative catalytic oxidation device (1) for catalytic oxidation of methane gas; A thermal storage catalytic ceramic body (2) is filled in the thermal storage chamber of the thermal storage catalytic oxidation device (1), and a catalyst is coated on the thermal storage catalytic ceramic body (2); The waste heat recovery system (8) comprises a waste heat boiler (801), a flue gas heat exchange pipe (803), a heat exchange box (8011) and a fresh air heat exchange pipe (8013), wherein the flue gas heat exchange pipe (803) is fixed inside the waste heat boiler (801), and one end of the flue gas heat exchange pipe (803) extends to the outside of the waste heat boiler (801) and is connected to the high-temperature flue gas pipeline (802) on the upper part of the thermal storage catalytic oxidation device (1), and the exhaust port of the waste heat boiler (801) and the heat exchange box (801) are connected to the exhaust port of the waste heat boiler (801). 1) is connected with a low-pressure steam pipeline (8010), a fresh air heat exchange pipe (8013) is fixed on the inner side of the heat exchange box (8011), and the air inlet end of the fresh air heat exchange pipe (8013) extends to the outer side of the heat exchange box (8011) and is connected with a fresh air pipeline (809), and an exhaust port of the fresh air heat exchange pipe (8013) is connected with a heating pipeline (8015), and the heating pipeline (8015) realizes the heating of the air inlet (8016) of the coal mine air shaft.

2. A coal mine gas thermal storage catalytic oxidation wellhead hot air supply system according to claim 1, characterized in that: A hot air blower (8014) is installed on the heating pipe (8015).

3. A coal mine gas thermal storage catalytic oxidation wellhead hot air supply system according to claim 1, characterized in that: It also includes a steam condensate recovery tank (8012), and a condensate recovery pipeline is provided between the heat exchange box (8011) and the steam condensate recovery tank (8012).

4. A coal mine gas thermal storage catalytic oxidation wellhead hot air supply system according to claim 1, characterized in that: The end of the flue gas heat exchange pipe (803) away from the high-temperature flue gas pipeline (802) extends to the outside of the waste heat boiler (801) and is connected to a low-temperature hot air pipeline (807), and a high-temperature valve (806) and a boiler fan (808) are respectively installed on the low-temperature hot air pipeline (807).

5. The coal mine gas thermal storage catalytic oxidation wellhead hot air supply system according to claim 1 is characterized by: One side of the waste heat boiler (801) is connected to a water supply pipe (805), and a water pump (804) is installed on the water supply pipe (805).

6. A coal mine gas thermal storage catalytic oxidation wellhead hot air supply system according to claim 1, characterized in that: The gas inlet pipe (3) and the tail gas pipe (5) are respectively connected to the air inlet chamber at the bottom of the regenerative catalytic oxidation device (1), wherein the gas inlet pipe (3) is provided with a high-pressure centrifugal fan (4), and the gas inlet pipe (3) passes the gas into the regenerative catalytic oxidation device (1) for catalytic oxidation through the high-pressure centrifugal fan (4), and the tail gas pipe (5) is installed with an electric shut-off valve (6), and the gas inlet pipe (3) and the tail gas pipe (5) are both provided with a switching valve group (7).

Images