CN209742956U - Double-oxidation heating system for ultra-low concentrated gas - Google Patents
Double-oxidation heating system for ultra-low concentrated gas Download PDFInfo
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- CN209742956U CN209742956U CN201920549332.3U CN201920549332U CN209742956U CN 209742956 U CN209742956 U CN 209742956U CN 201920549332 U CN201920549332 U CN 201920549332U CN 209742956 U CN209742956 U CN 209742956U
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Abstract
the utility model belongs to the technical field of the ultralow dense gas is handled and is utilized, in particular to ultralow dense gas dual oxidation heating system. The problem of the reliability of gas mixing and gas pipeline freeze in winter is solved, include the blender of being connected with drainage gas pipeline, the blender passes through air heater and air-blower intercommunication, the blender is connected with ultralow dense gas double oxidation device, ultralow dense gas double oxidation device entry department sets up the entry diverter valve, ultralow dense gas double oxidation device exit is provided with the export diverter valve, the export of ultralow dense gas double oxidation device is connected with chimney I through main draught fan, ultralow dense gas double oxidation device still is connected with exhaust-heat boiler through the pipeline, exhaust-heat boiler is connected with boiler draught fan and air heater respectively, boiler draught fan is connected with chimney II, set up frostproofing flue gas valve between exhaust-heat boiler and the air heater, set up the governing valve of discharging fume between exhaust-heat boiler and the boiler draught fan, air heater is connected with the boiler draught fan.
Description
Technical Field
The utility model belongs to the technical field of the ultralow dense gas is handled and is utilized, in particular to ultralow dense gas dual oxidation heating system.
Background
The ultra-low concentrated gas refers to coal mine gas with methane concentration of 0.3% -3%. The gas in the concentration range is far below the explosion limit concentration and cannot be combusted under natural conditions. The ultra-low concentrated gas double-oxidation system adopts the technologies of heat storage, catalysis and the like to oxidize and decompose coal mine gas with the concentration of 0.3-3% into carbon dioxide and water, and recovers heat and ensures safe operation.
The blending device in the prior art has the disadvantages of large blending space requirement, long blending distance and poor mixing uniformity. The utility model discloses an ultralow dense gas dual oxidation system adopts multistage blender, and low dense gas mixes rapidly with the air in the blender, forms the ultralow dense gas below the gas concentration 3%, can guarantee oxidation system's safe operation, and oxidation system security obtains greatly promoting.
The prior art does not have a front-end pipeline heating measure, has the potential safety hazards of valve failure and pipeline blockage caused by icing of pipelines in winter, and is very easy to cause safety accidents. If the methods of electric heat tracing, steam heat tracing and the like are adopted, additional heat tracing equipment investment and heat tracing energy consumption are needed. The utility model discloses an ultralow dense gas oxidation system utilizes the heat of evacuation flue gas to solve the gas pipeline problem of freezing winter, need not extra heat source, hardly increase the running cost, can improve heat utilization efficiency simultaneously.
Disclosure of Invention
The utility model discloses a solve the reliability problem of gas mixing and the frozen problem in gas pipeline winter, provide an ultralow dense gas dual oxidation heating system.
The utility model adopts the following technical proposal: the utility model provides an ultralow dense gas dual oxidation heating system, include the blender of being connected with the pump drainage gas pipe, the blender passes through air heater and air-blower intercommunication, the blender is connected with ultralow dense gas dual oxidation device, ultralow dense gas dual oxidation device entry department sets up the entry diverter valve, ultralow dense gas dual oxidation device exit is provided with the export diverter valve, ultralow dense gas dual oxidation device export is connected with chimney I through main draught fan, ultralow dense gas dual oxidation device still is connected with exhaust-heat boiler through the pipeline, exhaust-heat boiler is connected with boiler draught fan and air heater respectively, boiler draught fan is connected with chimney II, set up frostproofing flue gas valve between exhaust-heat boiler and the air heater, set up the governing valve of discharging fume between exhaust-heat boiler and the boiler draught fan, air heater is connected with the boiler draught fan.
furthermore, be provided with the mixing pipe more than 2 groups in the blender, every group mixing pipe includes interior mixing pipe, well mixing pipe and outer mixing pipe, and interior mixing pipe, well mixing pipe and outer mixing pipe set up the mixing pipe governing valve respectively with between the pump drainage gas pipeline, have a plurality of orifices on the mixing pipe, and the mixing pipe sets up in the pipeline of blender side by side.
Further, the diameter phi of the spray holes in the mixing pipe is 3 mm-5 mm; the spray holes face the center of the pipeline and deflect towards the incoming flow direction of the pumping gas, and the included angle alpha between the spray holes and the diameter direction of the pumping gas pipeline is 20-30 degrees.
Further, the pipe diameter of a pipeline of the mixer is D, the distance between the front and the back of each mixing pipe is A, the distance between the upper and the lower mixing pipes is B, and A = 0.4D-0.6D and B = 0.3D-0.35D are met; the distance between two adjacent groups of mixing pipes is C, and C = 1.2D-1.5D is satisfied.
Furthermore, the gas is pumped and discharged at a speed of 40m/s to 50 m/s.
Further, the mixer is connected with a chimney I, and an emergency bleeding valve is arranged between the mixer and the chimney I.
Further, the ultralow dense gas double oxidation device comprises heat storage chambers on the left side and the right side, low-temperature heat storage ceramics are arranged in the heat storage chambers, catalysts are arranged on the low-temperature heat storage ceramics, the heat storage chambers on the left side and the right side are respectively provided with an inlet and an outlet, the inlets of the heat storage chambers on the left side and the right side of the ultralow dense gas double oxidation device are respectively provided with an inlet switching valve V01 and an inlet switching valve V02, and the outlets of the heat storage chambers on the left side and the right side of the ultralow dense gas double oxidation device are respectively provided with an outlet switching valve V03 and an outlet switching.
compared with the prior art, the utility model discloses a blending device structure can ensure that the pump drainage gas reduces concentration to below 3% rapidly, ensures the safety of ultralow dense gas oxidation unit. If the pipeline anti-freezing measure is not available, the pipeline is frozen in winter, and safety accidents are easily caused. If other heat tracing methods, such as electric heat tracing and steam heat tracing, are adopted, additional heat tracing equipment investment and additional heat tracing energy consumption are required. The utility model uses partial discharged flue gas to solve the problem of pipeline anti-freezing, uses the waste heat of the discharged flue gas, has no heat tracing energy consumption and has the lowest operation cost; meanwhile, the thermal efficiency of the oxidation device system is improved.
Drawings
FIG. 1 is a connection diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a mixer configuration;
FIG. 3 is a schematic view of a nozzle structure;
In the figure: the method comprises the following steps of 1-a blower, 2-a mixer, 3-a methane concentration sensor, 4-an inlet switching valve, 5-low-temperature heat storage ceramic, 6-a catalyst, 7-low-temperature heat storage ceramic, 8-an ultra-low dense gas double oxidation device, 9-an outlet switching valve, 10-a main induced draft fan, 11-a chimney, 12-a waste heat boiler, 13-a smoke exhaust adjusting valve, 14-a boiler induced draft fan, 15-a chimney, 16-an anti-freezing smoke valve, 17-an air preheater, 18-an emergency relief valve, 19-a gas pumping and exhausting pipeline, 20-a mixing pipe adjusting valve, 21-a mixing pipe and 22-spray holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, an ultra-low concentrated gas double oxidation heating system comprises a mixer 2 connected with a gas pumping and discharging pipeline 19, the mixer 2 is communicated with air through an air preheater 17, the mixer 2 is connected with an ultra-low concentrated gas double oxidation device 8, an inlet switching valve 4 is arranged at the inlet of the ultra-low concentrated gas double oxidation device 8, the outlet of the ultra-low concentrated gas double oxidation device 8 is connected with a chimney I11 through a main induced draft fan 10, an outlet switching valve 9 is arranged at the outlet of the ultra-low concentrated gas double oxidation device 8, the ultra-low concentrated gas double oxidation device 8 is also connected with a waste heat boiler 12 through a pipeline, the waste heat boiler 12 is respectively connected with a boiler induced draft fan 14 and the air preheater 17, the boiler induced draft fan 14 is connected with a chimney II15, an anti-freezing flue gas valve 16 is arranged between the waste heat boiler 12 and the air preheater 17, and a smoke, the air preheater 17 is connected with a boiler induced draft fan 14. The mixer 2 is connected to a chimney I11, and an emergency bleeding valve 18 is provided between the mixer 2 and the chimney I11.
As shown in fig. 2, more than 2 groups of mixing pipes 21 are arranged in the mixer 2, the mixing pipes 21 are arranged in parallel in the pipeline of the mixer 2, each group of mixing pipes 21 comprises an inner mixing pipe, a middle mixing pipe and an outer mixing pipe, mixing pipe regulating valves 20 are respectively arranged between the inner mixing pipe, the middle mixing pipe and the outer mixing pipe and the gas exhaust pipeline, and a plurality of spray holes 22 are arranged on the mixing pipes 21.
The method comprises the following steps of arranging a blower, an air preheater and a mixer, preheating fresh air by the air preheater, and mixing the fresh air with the exhaust gas in the mixer; the gas concentration after mixing is controlled below 3%, and the operation safety of the oxidation device can be ensured. A methane concentration sensor is arranged behind the mixer; the concentration after mixing is controlled between 0.3 percent and 3 percent (the specific concentration is determined according to the heat supply load).
An electric butterfly valve is adopted as a reversing control valve. The inlet switching valves V01 and V02 are respectively used for controlling the connection and disconnection of a gas inlet pipeline and the regenerators on the left side and the right side of the oxidation device, namely controlling gas to enter the oxidation device; the outlet switching valves V03 and V04 are respectively used for controlling the on-off of the gas outlet pipeline and the regenerators on two sides of the oxidation device A, B, namely controlling the low-temperature flue gas to be discharged out of the oxidation device. The inlet switching valve and the outlet switching valve are matched to act, so that the control of the flowing direction of the ultra-low concentration gas is realized, and the automatic reversing is realized at regular intervals. The switching valve executes the switching action sequence as follows: v04 is closed, V01 is closed and V02 is opened after the vehicle is in place, and V03 is opened after the vehicle is in place; when reversing again, V03 is closed, V02 is closed and V01 is opened after the reversing is completed, and V04 is opened after the reversing is completed. The reversing time is 3min to 30 min.
The low-temperature flue gas is discharged into the atmosphere through a main induced draft fan and a chimney; the main induced draft fan is used for controlling the flow of the flue gas discharged by the oxidation device and carrying out variable frequency regulation.
an emergency relief valve is arranged in front of a reversing valve at an inlet of the oxidation device and used for directly discharging the ultra-low concentrated gas in emergency.
And part of the high-temperature flue gas enters the waste heat boiler from the middle part of the oxidation device through the high-temperature flue. After the temperature of the flue gas is reduced in the waste heat boiler, the flue gas is discharged into the atmosphere through a smoke exhaust regulating valve, a boiler induced draft fan and a chimney. The boiler induced draft fan is used for controlling the flow of high-temperature flue gas entering the waste heat boiler and carrying out variable frequency regulation.
A flue gas bypass and an anti-freezing flue gas valve are arranged at the outlet of the waste heat boiler; in winter, the smoke exhaust regulating valve is closed, the antifreezing smoke valve is opened, and after the smoke is cooled in the waste heat boiler, the smoke is further cooled through the antifreezing smoke valve and the air preheater and is exhausted into the atmosphere through the boiler induced draft fan and the chimney. In the air preheater, the fresh air is preheated by using the flue gas, so that the pipeline is prevented from being frozen.
The mixer can be divided into two stages or three stages; each stage of mixed gas consists of a group of mixing pipes (an inner mixing pipe, a middle mixing pipe and an outer mixing pipe); and a mixing pipe regulating valve is arranged between each mixing pipe and the pumping and discharging gas pipeline and is used for regulating the pumping and discharging gas flow of each mixing pipe. The mixing pipe is provided with a plurality of spray holes; the pumped gas is sprayed out from the spray holes on the mixing pipe and is rapidly mixed with air to form ultra-low concentration gas with the concentration of less than 3 percent. The diameter phi of the spray holes on the mixing pipe is 3 mm-5 mm; the spray holes are deflected towards the center of the pipeline and the incoming flow direction of the pumping gas, and the included angle alpha between the spray holes and the diameter direction of the pumping gas pipeline is 20-30 degrees; the gas discharge speed is 40m/s to 50 m/s. The pipe diameter of the mixer is D; the distance A between the front and the back of each mixing pipe and the distance B between the upper and the lower of each mixing pipe are; a =0.4D ~0.6D and B =0.3D ~0.35D are also satisfied. The distance between the two groups of mixing pipes is C; c =1.2D ~1.5D should be satisfied.
The structure and design parameters of the rapid mixing device are as follows:
One key point for ensuring the safety of the double oxidation device is to ensure that the gas concentration in the system is lower than 3 percent. Through the specific structure of the rapid mixing device, the low-concentration gas is rapidly mixed with the fresh air, and the concentration is reduced to below 3% in a very short distance to become the ultra-low concentration gas, so that the safety of the system is improved.
The mixer inlet is provided with an air preheater:
An air preheater is arranged at the inlet of the mixer, and the evacuated hot flue gas firstly passes through the heat exchanger and then is discharged in winter. The air preheater preheats air, improves the ultralow concentration gas temperature of treating oxidation treatment, solves the pipeline problem of freezing in winter on the one hand, on the other hand improves the device thermal efficiency.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (7)
1. The utility model provides an ultra-low dense gas dual oxidation heating system which characterized in that: comprises a mixer (2) connected with a gas pumping and exhausting pipeline (19), the mixer (2) is communicated with air through an air preheater (17), the mixer (2) is connected with an ultralow and concentrated gas double oxidation device (8), an inlet switching valve (4) is arranged at the inlet of the ultralow and concentrated gas double oxidation device (8), the outlet of the ultralow and concentrated gas double oxidation device (8) is connected with a chimney I (11) through a main induced draft fan (10), an outlet switching valve (9) is arranged at the outlet of the ultralow and concentrated gas double oxidation device (8), the ultralow and concentrated gas double oxidation device (8) is also connected with a waste heat boiler (12) through a pipeline, the waste heat boiler (12) is respectively connected with a boiler induced draft fan (14) and the air preheater (17), the boiler induced draft fan (14) is connected with a flue gas chimney II (15), an antifreezing valve (16) is arranged between the waste heat boiler (12) and the air preheater (17), a smoke exhaust adjusting valve (13) is arranged between the waste heat boiler (12) and a boiler induced draft fan (14), and an air preheater (17) is connected with the boiler induced draft fan (14).
2. The ultra-low concentrated gas dual-oxidation heating system according to claim 1, characterized in that: more than 2 groups of mixing pipes (21) are arranged in the mixer (2), each group of mixing pipes (21) comprises an inner mixing pipe, a middle mixing pipe and an outer mixing pipe, mixing pipe regulating valves (20) are arranged between the inner mixing pipe, the middle mixing pipe and the outer mixing pipes and a gas pumping pipeline respectively, a plurality of spray holes (22) are formed in the mixing pipes (21), and the mixing pipes (21) are arranged in the pipeline of the mixer (2) side by side.
3. The ultra-low-concentration gas double-oxidation heating system according to claim 2, characterized in that: the diameter phi of the spray holes (22) on the mixing pipe (21) is 3-5 mm; the spray holes (22) face the center of the pipeline and deflect towards the incoming flow direction of the pumping gas, and the included angle alpha between the direction of the spray holes (22) and the diameter direction of the pumping gas pipeline is 20-30 degrees.
4. The ultra-low concentrated gas dual-oxidation heating system according to claim 3, characterized in that: the pipe diameter of a pipeline of the mixer (2) is D, the distance A between the front and the back of each mixing pipe is A, the distance B between the upper and the lower mixing pipes is B, and A = 0.4D-0.6D and B = 0.3D-0.35D are met; the distance between two adjacent groups of mixing pipes (21) is C, and C = 1.2D-1.5D is satisfied.
5. The ultra-low concentrated gas dual-oxidation heating system according to claim 4, characterized in that: the gas discharge speed is 40m/s to 50 m/s.
6. The ultra-low concentrated gas dual-oxidation heating system according to claim 1, characterized in that: the mixer (2) is connected with a chimney I (11), and an emergency relief valve (18) is arranged between the mixer (2) and the chimney I (11).
7. The ultra-low concentrated gas dual-oxidation heating system according to claim 1, characterized in that: ultralow dense gas double oxidation unit (8) include the left and right sides regenerator, be provided with low temperature heat accumulation pottery in the regenerator, set up catalyst (6) on the low temperature heat accumulation pottery, the regenerator of the left and right sides is provided with import and export respectively, the import of the regenerator of the left and right sides of ultralow dense gas double oxidation unit (8) sets up entry diverter valve V01 and entry diverter valve V02 respectively, the export of the regenerator of the left and right sides of ultralow dense gas double oxidation unit (8) sets up export diverter valve V03 and export diverter valve V04 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920549332.3U CN209742956U (en) | 2019-04-22 | 2019-04-22 | Double-oxidation heating system for ultra-low concentrated gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920549332.3U CN209742956U (en) | 2019-04-22 | 2019-04-22 | Double-oxidation heating system for ultra-low concentrated gas |
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| CN209742956U true CN209742956U (en) | 2019-12-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973141A (en) * | 2019-04-22 | 2019-07-05 | 山西文龙中美环能科技股份有限公司 | Super low-concentration gas dual oxide heating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973141A (en) * | 2019-04-22 | 2019-07-05 | 山西文龙中美环能科技股份有限公司 | Super low-concentration gas dual oxide heating system |
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