CN209839698U - Combustible gas mixing and long-distance conveying processing system - Google Patents
Combustible gas mixing and long-distance conveying processing system Download PDFInfo
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- CN209839698U CN209839698U CN201920347134.9U CN201920347134U CN209839698U CN 209839698 U CN209839698 U CN 209839698U CN 201920347134 U CN201920347134 U CN 201920347134U CN 209839698 U CN209839698 U CN 209839698U
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Abstract
The utility model discloses a combustible gas mixing and long distance transport processing system, processing system includes: the system comprises a mixing unit, a long-distance conveying unit and an extremely-low-concentration combustible gas utilization unit; the mixing unit comprises an air or residual heat gas collecting pipeline, a combustible gas conveying pipeline and a first mixer; the air or residual heat gas collecting pipeline and the combustible gas conveying pipeline are respectively communicated with the mixed gas conveying pipeline; a first mixer is arranged at the joint where the three pipelines are communicated; the combustible gas conveying pipeline is communicated with a combustible gas discharge pipe; the long-distance conveying unit comprises a mixed gas conveying pipeline and a plurality of stages of relay pressurization fans arranged in the mixed gas conveying pipeline. The processing system can be used for safely collecting, mixing and conveying dispersed combustible gas discharged to the air, and provides a safe gas source below the explosion limit for a heat accumulating type high-temperature oxidation device, a large-sized boiler and the like.
Description
Technical Field
The utility model relates to a colliery energy saving and emission reduction, coal mine safety technique and engineering field, concretely relates to combustible gas mixing and long distance transport processing system in the colliery.
Background
In the production process of a coal mine, a large amount of gas stored in a coal seam can flow into a mining space, in order to ensure the safety and health of air in an underground mine of the coal mine, a large amount of fresh air needs to be blown into the underground mine, and the air flow carries methane with extremely low concentration (less than 0.75 percent) and is exhausted from the underground to the atmosphere through a return air inlet.
Especially in some high gas mines, because the concentration of combustible gas on the working face of the high gas mine far exceeds the standard specified by coal mine safety regulation, the gas concentration on the working face is difficult to control within an allowable range by simply adopting a ventilation method; in order to reduce and remove the threat of combustible gas in a mine to the safe production of a coal mine, the combustible gas existing or released in a coal (rock) layer is extracted by using negative pressure caused by mechanical equipment and a special pipeline and is conveyed to the ground or other safe places.
According to statistics, the total amount of methane discharged into the atmosphere by combustible gas pumping in coal mines in China is over 240 billionths of cubic meters every year. Methane gas has a strong greenhouse effect, corresponding to 25 times of carbon dioxide. The explosion limit of methane in air is 5% -16%. More than 60% of combustible gas in coal mines in China is low-concentration gas containing less than 30% of methane, and according to the requirements of coal mine safety regulations, the gas with the concentration of less than 30% cannot be stored in a gas storage tank, and most of the gas is directly discharged to the air. The direct discharge of the low-concentration gas drained from the coal mine causes huge waste of non-renewable resources on one hand, and also aggravates atmospheric pollution and greenhouse effect on the other hand.
The collection and the transportation of the combustible gas are realized, and the methane originally discharged to the atmosphere is eliminated by processing the combustible gas, so that the methane is oxidized into carbon dioxide and water, thereby generating a huge greenhouse gas emission reduction effect. Chinese patent CN105381694A discloses a blending processing system for ventilation air methane and gas drainage of coal mine, which comprises: the system comprises a ventilation air draft cover 6, a ventilation air conveying pipeline 7a, a gas pumping and discharging connecting pipeline 4, a mixer M, a mixed gas conveying pipeline 7b, an induced draft fan 11 and a heat accumulating type high-temperature oxidation device 12; and an exhaust port of the gas drainage connecting pipeline 4 is communicated with the ventilation air methane conveying pipeline 7a, so that the drainage gas is sucked into the ventilation air methane conveying pipeline 7a through the gas drainage connecting pipeline 4, is uniformly mixed with ventilation air methane in the ventilation air methane conveying pipeline 7a through a mixer M, and is conveyed to the heat accumulating type high-temperature oxidation device 12 through a mixed gas conveying pipeline 7b for oxidation treatment. The mixing processing system can be used for safely collecting, mixing and conveying ventilation air methane and drainage gas in a coal mine, providing a safe air source for subsequent utilization projects such as heat accumulation type high-temperature oxidation and the like, and discharging a thorough oxidation product to the atmospheric environment. However, the patent still has some disadvantages, such as that it is impossible to transport the gas over a long distance, and the concentration of the gas in the mixed gas transportation pipeline is not easily controlled below the explosive limit.
Therefore, how to safely and effectively collect and transport the combustible gas over long distances is very important.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a combustible gas mixing and long distance transport processing system, utilize above-mentioned processing system can carry out safe collection, mixing and transport with the combustible gas to the empty emission of dispersion, for heat accumulation formula high temperature oxidation device, large boiler etc. provide the safe air supply below the explosion limit.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
a combustible gas blending and long haul delivery processing system, the processing system comprising:
a blending unit;
a long-distance conveying unit and an extremely-low-concentration combustible gas utilization unit;
the blending unit is used for mixing air or waste hot gas with combustible gas and then conveying the mixture to the extremely-low-concentration combustible gas utilization unit through the long-distance conveying unit;
the long-distance conveying unit comprises a mixed gas conveying pipeline 5 and a plurality of stages of relay booster fans 6 arranged in the mixed gas conveying pipeline 5.
Further, the blending unit comprises an air or residual heat gas collecting pipeline 1, a combustible gas conveying pipeline 4 and a first mixer 20;
the air or residual heat gas collecting pipeline 1 and the combustible gas conveying pipeline 4 are respectively communicated with a mixed gas conveying pipeline 5; a first mixer 20 is provided at the junction where the three conduits communicate.
Further, a collecting pipeline regulating valve 8 is arranged on the air or residual heat gas collecting pipeline 1; the air or residual heat gas collecting pipeline 1 is provided with a first flow metering device 17, and the mixed gas conveying pipeline 5 is provided with a first combustible gas concentration monitor 11 at one side close to the outlet of the first mixer 20; the first combustible gas concentration monitor 11 is connected with the first flow metering device 17, and the concentration of combustible gas in the mixed gas conveying pipeline 5 is monitored, so that the collecting pipeline regulating valve 8 arranged on the air or residual heat gas collecting pipe 1 is regulated, and the concentration of the combustible gas in the mixed gas conveying pipeline 5 is controlled.
Further, the combustible gas delivery pipeline 4 is communicated with a combustible gas discharge pipe 3, and the combustible gas discharge pipe 3 is arranged at a discharge port of the industrial combustible gas discharge device 10 and is communicated with the atmosphere.
Preferably, the combustible gas discharge pipe 3 is a communicated cover body structure and comprises a combustible gas emptying pipe 3-1 and a combustible gas induced draft cover 3-2; the lower port of the combustible gas emptying pipe 3-1 is connected with industrial combustible gas discharge equipment 10; the upper end opening of the combustible gas emptying pipe 3-1 is connected with a combustible gas induced draft cover 3-2.
Further, the mixed gas conveying pipeline 5 is communicated with the air or residual heat gas collecting branch pipe 2 before the combustible gas with extremely low concentration is utilized, and a mixer is arranged at the intersection of the mixed gas conveying pipeline 5 and the air or residual heat gas collecting branch pipe 2.
Furthermore, a branch pipe adjusting valve 9 is arranged on the air or residual heat gas collecting branch pipe 2, and a second combustible gas concentration monitor 12 is arranged on one side of the mixed gas conveying pipeline 5 close to the outlet of the second mixer 21; the second combustible gas concentration monitor 12 is connected with the branch pipe regulating valve 9, and the opening degree of the branch pipe regulating valve 9 arranged on the air or residual heat gas collecting branch pipe 2 is regulated by monitoring the concentration of combustible gas of the mixed gas conveying pipeline 5.
Furthermore, the mixed gas conveying pipeline 5 is provided with a demisting and dehydrating device 19 at the upstream of the extremely-low concentration combustible gas utilization unit, and a plurality of gas flow conveying channels are formed in the demisting and dehydrating device 19 through corrugated plates arranged in parallel and are used for conveying gas subjected to water drop removal into the extremely-low concentration combustible gas utilization unit.
Furthermore, an explosion suppression device 13 is arranged on the combustible gas conveying pipeline 4, the explosion suppression device 13 is connected with two groups of flame sensors 14 arranged on the combustible gas conveying pipeline 4 and the combustible gas discharge pipe 3, and the explosion suppression device 13 carries out explosion monitoring through the two groups of flame sensors 14 arranged on the combustible gas conveying pipeline 4 and the combustible gas discharge pipe 3;
set up combustible gas flow control valve 15 on the combustible gas pipeline 4, the mixed gas pipeline 5 is equipped with combustible gas concentration monitor 12 in the one side that is close to the export of first blender, and second combustible gas concentration monitor 12 is connected with combustible gas flow control valve 15, through the continuous on-line monitoring to combustible gas concentration, carries out closed loop control to the combustible gas flow control valve 15 that is equipped with on the combustible gas pipeline 4.
Further, a second flow metering device 18 is arranged on the mixed gas conveying pipeline 5 at the downstream of the first mixer 20, and the second flow metering device 18 performs closed-loop frequency conversion control on the relay booster fan 6 according to the monitoring value of the second flow metering device 18, so that the control of the gas flow in the mixed gas conveying pipeline 5 is realized;
the mixed gas conveying pipeline 5 is provided with an isolation valve 16 at one side close to the inlet of the extremely-low concentration combustible gas utilization unit, the isolation valve 16 is connected with the second combustible gas concentration monitor 12, and the isolation valve 16 controls the on-off of the second combustible gas concentration monitor 12 according to the monitoring result.
In the utility model, the first mixer 20 is a combination of a guide plate and a static mixer, and the guide plate is arranged at the intersection of the mixed gas conveying pipeline 5 and the combustible gas conveying pipeline 4; the static mixer is disposed downstream of the junction of the mixed gas delivery conduit 5 and the combustible gas delivery conduit 4.
In the utility model, the second mixer is also a combination of a guide plate and a static mixer, and the guide plate is arranged at the junction of the mixed gas conveying pipeline 5 and the air or residual heat gas collecting branch pipe 2; the static blender is arranged at the downstream of the junction of the mixed gas conveying pipeline 5 and the air or residual heat gas collecting branch pipe 2.
Compared with the prior art, the utility model, its advantage lies in:
1. the utility model discloses according to the pipeline distance and the system condition, through set up a plurality of levels relay booster fan in the mist pipeline, can gather and long distance transport combustible gas (colliery gas etc.) safely effectual.
2. The utility model discloses still gather the branch pipe with air or residual heat gas before extremely low concentration combustible gas utilizes the unit for further control gets into the combustible gas's in extremely low concentration combustible gas utilizes the unit concentration.
Drawings
FIG. 1 is a schematic view of a treatment system of the present invention;
reference numerals: 1. an air or residual heat gas collecting pipeline; 2. an air or residual heat gas collecting branch pipe; 3. a combustible gas discharge pipe; 3-1, a combustible gas emptying pipe; 3-2, a combustible gas induced hood; 4. a combustible gas delivery conduit; 5. a mixed gas delivery conduit; 6. a relay booster fan; 7. a combustible gas utilization unit with extremely low concentration; 8. a collecting pipeline regulating valve; 9. collecting a branch pipe regulating valve; 10. industrial combustible gas discharge equipment; 11. a first combustible gas concentration monitor; 12. a second combustible gas concentration monitor; 13. an explosion suppression device; 14. a flame sensor; 15. a combustible gas flow regulating valve; 16. an isolation valve; 17. a first flow metering device; 18. a second flow metering device; 19. a demisting and dewatering device; 20. a first mixer; 21. a second mixer.
Detailed Description
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. Unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. The description is only for the purpose of aiding understanding of the present invention and should not be taken as a specific limitation of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in figure 1 of the drawings, in which,
a combustible gas blending and long haul delivery processing system, the processing system comprising:
a blending unit;
a long-distance conveying unit and an extremely-low-concentration combustible gas utilization unit;
the blending unit mixes air or waste hot gas with combustible gas and then conveys the mixture to the extremely-low-concentration combustible gas utilization unit 7 through the long-distance conveying unit;
the long-distance conveying unit comprises a mixed gas conveying pipeline 5 and a plurality of stages of relay booster fans 6 arranged in the mixed gas conveying pipeline 5.
The mixing unit comprises an air or residual heat gas collecting pipeline 1, a combustible gas conveying pipeline 4 and a first mixer 20;
the air or residual heat gas collecting pipeline 1 and the combustible gas conveying pipeline 4 are respectively communicated with a mixed gas conveying pipeline 5; a first mixer 20 is provided at the junction where the three conduits communicate.
The air or residual heat gas collecting pipeline 1 is provided with a collecting pipeline regulating valve 8; the air or residual heat gas collecting pipeline 1 is provided with a first flow metering device 17, and the mixed gas conveying pipeline 5 is provided with a first combustible gas concentration monitor 11 at one side close to the outlet of the first mixer 20; through monitoring the concentration of the combustible gas in the mixed gas conveying pipeline 5, the collecting pipeline regulating valve 8 arranged on the air or residual heat gas collecting pipe 1 is regulated, and the concentration of the combustible gas in the mixed gas conveying pipeline 5 is controlled.
The combustible gas delivery pipeline 4 is communicated with a combustible gas discharge pipe 3, and the combustible gas discharge pipe 3 is arranged at a discharge port of the industrial combustible gas discharge equipment 10 and is communicated with the atmosphere.
The combustible gas discharge pipe 3 is of a communicated cover body structure and comprises a combustible gas emptying pipe 3-1 and a combustible gas induced air cover 3-2; the lower port of the combustible gas emptying pipe 3-1 is connected with industrial combustible gas discharge equipment 10; the upper end opening of the combustible gas emptying pipe 3-1 is connected with a combustible gas induced draft cover 3-2.
The mixed gas conveying pipeline 5 is communicated with the air or residual heat gas collecting branch pipe 2 before the extremely-low-concentration combustible gas utilizing unit, and a mixer is arranged at the intersection of the mixed gas conveying pipeline 5 and the air or residual heat gas collecting branch pipe 2.
A branch pipe adjusting valve 9 is arranged on the air or residual heat gas collecting branch pipe 2, and a second combustible gas concentration monitor 12 is arranged on one side of the mixed gas conveying pipeline 5 close to an outlet of the second mixer 21; the opening degree of a branch pipe adjusting valve 9 arranged on the air or residual heat gas collecting branch pipe 2 is adjusted by monitoring the concentration of combustible gas of the mixed gas conveying pipeline 5.
The mixed gas conveying pipeline 5 is provided with a demisting dehydration device 19 at the upstream of the extremely-low concentration combustible gas utilization unit, and a plurality of gas supply flow conveying channels are formed in the demisting dehydration device 19 through corrugated plates arranged in parallel and are used for conveying gas subjected to water drop removal into the extremely-low concentration combustible gas utilization unit.
The combustible gas conveying pipeline 4 is provided with an explosion suppression device 13, and the explosion suppression device 13 carries out explosion monitoring through two groups of flame sensors 14 arranged on the combustible gas conveying pipeline 4 and the combustible gas discharge pipe 3;
set up combustible gas flow control valve 15 on the combustible gas pipeline 4, the gas mixture pipeline 5 is equipped with combustible gas concentration monitor 12 in the one side that is close to the export of first blender, through the continuous on-line monitoring to combustible gas concentration, carries out closed loop control to the combustible gas flow control valve 15 that is equipped with on the combustible gas pipeline 4.
The mixed gas conveying pipeline 5 is provided with a second flow metering device 18 at the downstream of the first mixer 20, and the second flow metering device 18 performs closed-loop frequency conversion control on the relay booster fan 6 according to the monitoring value of the second flow metering device 18, so that the control of the gas flow in the mixed gas conveying pipeline 5 is realized;
the mixed gas conveying pipeline 5 is provided with an isolation valve 16 at one side close to the inlet of the extremely-low concentration combustible gas utilization unit, and the isolation valve 16 controls the on-off of the second combustible gas concentration monitor 12 according to the monitoring result.
The first mixer 20 is a combination of a flow guide plate and a static mixer, wherein the flow guide plate is arranged at the junction of the mixed gas conveying pipeline 5 and the combustible gas conveying pipeline 4; the static mixer is disposed downstream of the junction of the mixed gas delivery conduit 5 and the combustible gas delivery conduit 4.
The second mixer is also a combination of a guide plate and a static mixer, and the guide plate is arranged at the intersection of the mixed gas conveying pipeline 5 and the air or residual heat gas collecting branch pipe 2; the static blender is arranged at the downstream of the junction of the mixed gas conveying pipeline 5 and the air or residual heat gas collecting branch pipe 2.
Example 2
As shown in fig. 1, a combustible gas blending and long-distance transportation processing system comprises: the system comprises an air or residual heat gas collecting pipe 1, an air or residual heat gas collecting branch pipe 2, a combustible gas discharge pipe 3, a combustible gas conveying pipe 4, a mixer, a mixed gas conveying pipeline 5, a relay pressurizing fan 6 and an extremely-low-concentration combustible gas utilization unit 7; the mixed gas conveying pipeline 5 is communicated with the air or residual heat gas collecting pipe 1, so that air in the atmosphere or non-combustible gas with residual heat is sucked into the mixed gas conveying pipeline 5 by utilizing the negative pressure in the mixed gas conveying pipeline 5; the combustible gas conveying pipe 4 is communicated with the mixed gas conveying pipeline 5, so that the combustible gas is sucked into the mixed gas conveying pipeline 5 due to negative pressure, is uniformly mixed with air or hot air flowing in the mixed gas conveying pipeline 5 through a mixer to form safe mixed gas under the explosion limit, and is conveyed to one or more extremely-low-concentration combustible gas utilization units 7 through the mixed gas conveying pipeline 5 for treatment; the conveying power of the combustible gas and the hot air is derived from a draught fan and a single-stage or multi-stage relay booster fan 6 which are arranged at the position of the extremely-low-concentration combustible gas utilization unit 7; the mixer is a combination of a guide plate and a static mixer, and the guide plate is arranged near the junction of the mixed gas conveying pipeline 5 and the combustible gas conveying pipeline 4; the static blender is arranged at the downstream of the junction of the mixed gas conveying pipeline 5 and the combustible gas conveying pipeline 4.
The processing system further comprises: a combustible gas emptying pipe 3-1 and a combustible gas induced draft cover 3-2; the lower port of the combustible gas emptying pipe 3-1 is connected with industrial combustible gas discharge equipment 10; the combustible gas discharge pipe 3 is a communicated cover body structure, and the combustible gas discharge pipe 3 is arranged at the discharge port of the industrial combustible gas discharge device 10 and is communicated with the atmosphere; and the side wall of the combustible gas discharge pipe 3 is provided with an air inducing hole which is communicated with an air inlet of the combustible gas conveying pipe 4.
The combustible gas delivery pipe 4 is provided with an explosion suppression device 13, and the explosion suppression device 13 carries out explosion monitoring through two groups of flame sensors 14 arranged on the combustible gas delivery pipe 4 and the combustible gas discharge pipe 3.
And the air or residual heat gas collecting pipe 1 is provided with a collecting pipeline regulating valve 8. The air or residual heat gas collecting pipe 1 is provided with a first flow metering device 17 and a first combustible gas concentration monitoring device 11; through monitoring the concentration of the combustible gas in the mixed gas conveying pipeline 5, the collecting pipeline regulating valve 8 arranged on the air or residual heat gas collecting pipe 1 is regulated, and the concentration of the combustible gas in the mixed gas conveying pipeline 5 is controlled.
The mixed gas conveying pipeline 5 is provided with a second flow metering device 18 at the downstream of the first mixer, and the flow metering device performs closed-loop frequency conversion control on the relay booster fan 6 through a displayed monitoring value to realize the control of the gas flow in the mixed gas conveying pipeline 5.
The mixed gas conveying pipeline 5 is provided with a first combustible gas concentration monitor 11 at one side close to the outlet of the first mixer, and the combustible gas flow regulating valve 15 arranged on the combustible gas conveying pipeline 4 is subjected to closed-loop regulation through continuous online monitoring of the combustible gas concentration.
The combustible gas conveying pipe 4 extends into the mixed gas conveying pipe 5, and a distance is reserved between the pipe wall of the mixed gas conveying pipe 5 and the exhaust port of the combustible gas conveying pipe 4 opposite to the pipe wall.
The mixed gas conveying pipeline 5 is provided with a demisting dehydration device 19 at the upstream of the extremely-low concentration combustible gas utilization unit 7, and a plurality of gas supply flow conveying channels are formed in the demisting dehydration device 19 through corrugated plates arranged in parallel and are used for conveying gas subjected to water drop removal into the extremely-low concentration combustible gas utilization unit 7.
The mixed gas conveying pipeline 5 is provided with an isolating valve 16 at one side close to the inlet of the extremely-low concentration combustible gas utilization unit 7, the isolating valve 16 controls the on-off of the second combustible gas concentration monitor 12 according to the monitoring result, and when the concentration of the combustible gas monitored by the second combustible gas concentration monitor 12 exceeds a preset threshold value, the isolating valve 16 is quickly closed, so that the extremely-low concentration combustible gas utilization unit 7 is thoroughly isolated from the mixed gas conveying pipeline 5.
The concentration of the combustible gas conveyed in the mixed gas conveying pipeline 5 is controlled below the explosion limit, and single or a plurality of relay pressurizing fans 6 are adopted according to the pipeline distance and the system condition, and all the fans adopt explosion-proof fans.
The mixed gas conveying pipeline 5 is provided with an air or residual heat gas collecting branch pipe 2 in front of the extremely-low-concentration combustible gas utilization unit 7 and a collecting branch pipe adjusting valve 9, the opening degree of the collecting branch pipe adjusting valve 9 is controlled according to the operation requirement of the extremely-low-concentration combustible gas utilization unit 7 and the numerical value of a second combustible gas concentration monitor 12 in the operation process, and the combustible gas concentration entering the extremely-low-concentration combustible gas utilization unit 7 is controlled within a proper range.
Conventional technical knowledge in the field can be adopted in the content which is not described in detail in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art will understand that modifications and equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of them shall fall within the scope of the claims of the present invention.
Claims (11)
1. A combustible gas blending and long haul delivery processing system, the processing system comprising:
the system comprises a mixing unit, a long-distance conveying unit and an extremely-low-concentration combustible gas utilization unit;
the mixing unit comprises an air or residual heat gas collecting pipeline (1), a combustible gas conveying pipeline (4) and a first mixer (20);
the air or residual heat gas collecting pipeline (1) and the combustible gas conveying pipeline (4) are respectively communicated with the mixed gas conveying pipeline (5); a first mixer (20) is arranged at the junction where the three pipelines are communicated;
the combustible gas conveying pipeline (4) is communicated with the combustible gas discharge pipe (3);
the long-distance conveying unit comprises a mixed gas conveying pipeline (5) and a plurality of stages of relay pressurization fans (6) arranged in the mixed gas conveying pipeline (5).
2. The treatment system according to claim 1, wherein the mixed gas delivery duct (5) is further in communication with an air or residual heat gas collecting branch (2) before the extremely low concentration combustible gas utilization unit, and a second mixer (21) is provided at the intersection of the mixed gas delivery duct (5) and the air or residual heat gas collecting branch (2).
3. A treatment system according to claim 1, characterized in that the mixed gas conveying pipe (5) is provided with a demisting and dewatering device (19) upstream of the extremely low concentration combustible gas utilization unit.
4. A treatment system according to claim 2, characterized in that the mixed gas conveying pipe (5) is provided with a demisting and dewatering device (19) upstream of the extremely low concentration combustible gas utilization unit.
5. The treatment system according to any one of claims 1 to 4, wherein the combustible gas discharge pipe (3) is a conductive enclosure structure comprising a combustible gas exhaust pipe (3-1) and a combustible gas induced draft housing (3-2); the lower port of the combustible gas emptying pipe (3-1) is connected with industrial combustible gas discharge equipment (10); the upper end opening of the combustible gas emptying pipe (3-1) is connected with a combustible gas induced air cover (3-2).
6. The treatment system according to any one of claims 1 to 4, wherein a collection duct regulating valve (8) is provided on the air or residual heat gas collection duct (1); the air or residual heat gas collecting pipeline (1) is provided with a first flow metering device (17), the mixed gas conveying pipeline (5) is provided with a first combustible gas concentration monitor (11) at one side close to the outlet of the first mixer (20), and the first combustible gas concentration monitor (11) is connected with the first flow metering device (17).
7. The treatment system according to any one of claims 1 to 4, wherein a combustible gas flow regulating valve (15) is provided on the combustible gas delivery conduit (4), and the mixed gas delivery conduit (5) is provided with a second combustible gas concentration monitor (12) on a side close to the outlet of the first mixer, the second combustible gas concentration monitor (12) being connected to the combustible gas flow regulating valve (15).
8. A treatment system according to any of claims 1 to 4, wherein the combustible gas delivery conduit (4) is provided with explosion suppression means (13), the explosion suppression means (13) being connected to two sets of flame sensors (14) provided on the combustible gas delivery conduit (4) and the combustible gas discharge pipe (3).
9. The treatment system according to claim 2, wherein the air or residual heat gas collecting branch pipe (2) is provided with a branch pipe regulating valve (9), and the mixed gas delivery pipe (5) is provided with a second combustible gas concentration monitor (12) at a side close to the outlet of the second mixer (21); the second combustible gas concentration monitor (12) is connected with the branch pipe regulating valve (9).
10. The treatment system according to any one of claims 1 to 4, wherein the mixed gas delivery pipe (5) is provided with an isolation valve (16) on a side near an inlet of the extremely low concentration combustible gas utilization unit, and the isolation valve (16) is connected to the second combustible gas concentration monitor (12).
11. A treatment system according to any of claims 1-4, characterized in that the mixed gas conveying piping (5) is provided with a second flow metering device (18) downstream of the first mixer (20).
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