CN119367986A - System and method for reducing carbon utilization of coal mine gas - Google Patents
System and method for reducing carbon utilization of coal mine gas Download PDFInfo
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Abstract
提供一种用于煤矿瓦斯减碳利用的系统及方法。系统包括低浓度抽采瓦斯输送单元、乏风瓦斯收集及输送分配单元、瓦斯掺混单元、低浓度抽采瓦斯蓄热热氧化单元、乏风瓦斯蓄热催化氧化单元、氧化余热综合利用单元和排放单元；瓦斯掺混单元连接低浓度抽采瓦斯输送单元和乏风瓦斯收集及输送分配单元；低浓度抽采瓦斯蓄热热氧化单元连接瓦斯掺混单元；乏风瓦斯蓄热催化氧化单元连接乏风瓦斯收集及输送分配单元和低浓度抽采瓦斯蓄热热氧化单元；氧化余热综合利用单元连接低浓度抽采瓦斯蓄热热氧化单元和乏风瓦斯蓄热催化氧化单元。该系统及方法通过将蓄热氧化系统与蓄热催化氧化系统联合使用，能够提高瓦斯氧化热能利用率，实现乏风瓦斯中甲烷低成本减排。
Provided is a system and method for reducing carbon utilization of coal mine gas. The system includes a low-concentration extraction gas transportation unit, an airless gas collection and transportation distribution unit, a gas blending unit, a low-concentration extraction gas heat storage thermal oxidation unit, an airless gas heat storage catalytic oxidation unit, an oxidation waste heat comprehensive utilization unit and a discharge unit; the gas blending unit is connected to the low-concentration extraction gas transportation unit and the airless gas collection and transportation distribution unit; the low-concentration extraction gas heat storage thermal oxidation unit is connected to the gas blending unit; the airless gas heat storage catalytic oxidation unit is connected to the airless gas collection and transportation distribution unit and the low-concentration extraction gas heat storage thermal oxidation unit; the oxidation waste heat comprehensive utilization unit is connected to the low-concentration extraction gas heat storage thermal oxidation unit and the airless gas heat storage catalytic oxidation unit. The system and method can improve the utilization rate of gas oxidation heat energy by combining the thermal storage oxidation system with the thermal storage catalytic oxidation system, and achieve low-cost emission reduction of methane in the airless gas.
Description
Technical Field
The invention belongs to the field of carbon emission reduction control, and particularly relates to a system and a method for coal mine gas carbon reduction utilization.
Background
Methane is the second largest greenhouse gas worldwide with 84 and 28 times the potential for temperature rise of carbon dioxide, respectively. It was estimated that approximately 0.5 ℃ of the global air temperatures were derived from methane emissions at 1.1 ℃ where the levels rose above before industrialization.
Compared with the technical difficulty and economy of the coal methane emission control, the method has the advantages that the challenge in the oil and gas industry is larger, and the comprehensive utilization mode is closely related to the concentration of methane contained in the coal methane emission control. For high-concentration gas (the concentration is more than 30%), the gas is mainly used as chemical raw materials and fuel at present, and has higher technical maturity and better economic benefit. The low-concentration extracted gas (the concentration is 9% -30%), can be utilized by a generator set of a reciprocating internal combustion engine, and can be purified to be changed into high-concentration gas for use. For ultralow-concentration extracted gas (concentration is 3-9%) and ventilation air methane (concentration is less than 0.75%) which account for more than 80% of the total emission of coal mine gas, the gas cannot be directly combusted due to the fact that the concentration is too low and the air-fuel ratio is too large, and the current utilization mode is to oxidize and heat the gas by adopting an oxidation technology and mainly comprises a heat accumulating oxidation technology and a heat accumulating catalytic oxidation technology.
Currently, gas heat accumulating oxidation projects have been built in a number of coal mines, with gas concentrations of about 1.2% available. For lower-concentration gas, a regenerative catalytic oxidation technology can be adopted, and the catalyst is used for reducing the methane oxidation temperature to 400-500 ℃ and reducing the generation of nitrogen oxides, so that the method is a prospect of the development of coal mine gas utilization technology.
The traditional ventilation air methane is subjected to single carbon oxide emission reduction, because methane concentration in ventilation air methane is low, stable self-heating balance is difficult, additional energy is needed to be consumed for heat compensation, operation cost is high, ventilation air methane oxidation has no stable waste heat and can be used for the outside, economy of a ventilation air methane emission reduction project is poor, a heat storage oxidation mode is adopted for low-concentration extraction methane at present, low-concentration extraction methane (1.5-9%) and ventilation air methane (< 0.75%) are mixed to form 1.2% concentration methane, the 1.2% concentration methane is sent to a thermal oxidation furnace for oxidation treatment, oxidation waste heat is mainly used for heat supply and power generation in winter, power generation is mainly used in summer, but the total amount of methane is limited to be poor in power generation economy in summer, and in order to mix and send into an oxidation system, only ventilation air methane with limited volume can be treated, most of the rest ventilation air methane is still exhausted, and emission reduction treatment of ventilation air methane cannot be further increased.
Therefore, development of a technical method for reducing emission of methane in large-scale gas in coal mines is urgently needed at present so as to realize utilization of potential heat energy of the gas and improve carbon emission reduction of the coal mines.
Disclosure of Invention
A first object of the present invention is to provide a system for coal mine gas abatement by combining a thermal oxidation system with a catalytic oxidation system.
The second aim of the invention is to provide a method for reducing carbon utilization of coal mine gas by using the system, which can improve the utilization rate of gas heat energy, increase the treatment capacity of ventilation air methane, improve the carbon emission reduction and reduce the carbon emission reduction cost.
In order to achieve the first object of the present invention, the following technical solutions are adopted:
The system for reducing carbon utilization of coal mine gas comprises a low-concentration extracted gas conveying unit, a ventilation air methane collecting and conveying distribution unit, a gas blending unit, a low-concentration extracted gas heat storage and thermal oxidation unit, a ventilation air methane heat storage and catalytic oxidation unit, an oxidation waste heat comprehensive utilization unit and an emission unit which are connected through pipelines,
The inlet of the gas blending unit is respectively connected with the outlets of the low-concentration extracted gas conveying unit and the ventilation air methane collecting and conveying distribution unit and is used for respectively introducing the low-concentration extracted gas and the ventilation air methane and blending to obtain blended gas;
The low-concentration extracted gas heat storage thermal oxidation unit comprises a mixed gas inlet, a hot gas outlet and a cooling gas outlet, wherein the mixed gas inlet is connected to the outlet of the gas mixing unit and is used for carrying out thermal oxidation reaction on mixed gas from the gas mixing unit to obtain thermal oxidation gas, one part of the thermal oxidation gas is output through the cooling gas outlet after being cooled by the heat storage body of the thermal oxidation gas, and the other part of the thermal oxidation gas is directly output through the hot gas outlet;
the ventilation air methane heat storage catalytic oxidation unit comprises a ventilation air methane inlet, a flue gas inlet, a hot flue gas outlet and a cooling flue gas outlet, wherein the ventilation air methane inlet is connected to the ventilation air methane collecting and conveying distribution unit and used for feeding ventilation air methane, the flue gas inlet is connected to the hot flue gas outlet of the low-concentration extraction gas heat storage thermal oxidation unit and used for feeding hot oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit so as to carry out auxiliary heating on ventilation air methane fed into the ventilation air methane heat storage catalytic oxidation unit for catalytic oxidation reaction, and catalytic oxidation flue gas is obtained, wherein one part of the catalytic oxidation flue gas is output through the cooling flue gas outlet after being cooled by a heat accumulator, and the other part of the catalytic oxidation flue gas is directly output through the hot flue gas outlet;
The inlet of the oxidation waste heat comprehensive utilization unit is respectively connected to the hot flue gas outlets of the low-concentration extraction gas heat storage thermal oxidation unit and the ventilation air methane heat storage catalytic oxidation unit, and is used for utilizing and then cooling part of hot oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit and catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit and outputting cooled flue gas;
the inlet of the discharge unit is respectively connected to the cooling flue gas outlet of the low-concentration extraction gas heat storage thermal oxidation unit and the ventilation air methane heat storage catalytic oxidation unit and the flue gas outlet of the oxidation waste heat comprehensive utilization unit, and is used for discharging cooling thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit, cooling catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit and cooling flue gas from the oxidation waste heat comprehensive utilization unit.
Preferably, the low-concentration extraction gas heat storage thermal oxidation unit is provided with a heat storage thermal oxidation chamber, the ventilation air methane heat storage catalytic oxidation unit is provided with a heat storage catalytic oxidation chamber, and two ends of a first thermal oxidation flue gas pipeline from the low-concentration extraction gas heat storage thermal oxidation unit to the ventilation air methane heat storage catalytic oxidation unit are respectively connected to the heat storage thermal oxidation chamber and the heat storage catalytic oxidation chamber.
Preferably, a bleeder valve is arranged on a first thermal oxidation flue gas pipeline from the low-concentration extraction gas thermal storage thermal oxidation unit to the ventilation air methane thermal storage catalytic oxidation unit and used for controlling the circulation condition of materials in the first thermal oxidation flue gas pipeline.
Preferably, a discharge valve is arranged on a second thermal oxidation flue gas pipeline from the low-concentration extraction gas heat storage thermal oxidation unit to the oxidation waste heat comprehensive utilization unit, and the discharge valve is used for controlling the circulation condition of materials in the second thermal oxidation flue gas pipeline.
Preferably, the emission unit comprises a fan and a chimney which are sequentially connected, and the emission unit is respectively connected to a cooling flue gas outlet of the low-concentration extraction gas heat storage thermal oxidation unit and a cooling flue gas outlet of the ventilation air methane heat storage catalytic oxidation unit and a flue gas outlet of the oxidation waste heat comprehensive utilization unit through inlets of the fan, and is used for sending cooling thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit, cooling catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit and cooling flue gas from the oxidation waste heat comprehensive utilization unit into the chimney for emission.
Preferably, the emission unit further comprises a mixing flue, and the mixing flue is arranged at the inlet end of the fan and is used for receiving and buffering the cooling thermal oxidation flue gas from the low-concentration extracted gas thermal storage thermal oxidation unit and the cooling catalytic oxidation flue gas from the ventilation air methane thermal storage catalytic oxidation unit so as to supply the fan.
The oxidation waste heat comprehensive utilization unit comprises a waste heat boiler and a heat utilization unit which are connected through pipelines, wherein an inlet of the waste heat boiler is connected to a flue gas outlet of the low-concentration extraction gas heat storage thermal oxidation unit and a flue gas outlet of the ventilation air methane heat storage catalytic oxidation unit respectively and is used for introducing hot oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit and catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit and utilizing heat energy in the hot oxidation flue gas to produce steam, and the heat utilization unit is connected to a steam outlet of the waste heat boiler and is used for utilizing steam from the waste heat boiler.
Preferably, a flue gas conveying pipeline is arranged from a flue gas outlet of the waste heat boiler to an inlet of the discharge unit, and is used for conveying flue gas from the waste heat boiler to the discharge unit for discharge.
Preferably, in the oxidation waste heat comprehensive utilization unit, the heat utilization unit comprises a heat supply unit and/or a power generation unit, the heat supply unit comprises any one or more of heating, cooling and industrial steam in a mining area, and the power generation unit comprises a steam turbine and a power generator which are sequentially connected.
To achieve the second object of the present invention, there is provided a method for coal mine gas carbon reduction utilization by using the aforementioned system, the method comprising:
(1) Respectively sending the low-concentration extracted gas from the low-concentration extracted gas conveying unit and the ventilation air methane from the ventilation air methane collecting, conveying and distributing unit into the gas blending unit for blending to obtain blended gas;
(2) The blended gas from the gas blending unit is sent into the low-concentration extracted gas heat storage thermal oxidation unit for thermal oxidation reaction, so as to obtain thermal oxidation flue gas, wherein a part of the thermal oxidation flue gas is cooled by a heat storage body and then is output through a cooling flue gas outlet, and the rest of the thermal oxidation flue gas is directly output through a thermal flue gas outlet;
(3) Partial thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit and partial ventilation air methane from the ventilation air methane collecting and conveying distribution unit are sent into the ventilation air methane heat storage catalytic oxidation unit, partial thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit (4) is utilized to assist partial ventilation air methane from the ventilation air methane collecting and conveying distribution unit (2) to carry out catalytic oxidation reaction, catalytic oxidation flue gas is obtained, one part of the catalytic oxidation flue gas is output through a cooling flue gas outlet after being cooled by a heat accumulator of the catalytic oxidation flue gas, and the other part of the catalytic oxidation flue gas is directly output through a hot flue gas outlet of the catalytic oxidation flue gas outlet;
(4) Partial thermal oxidation flue gas from the low-concentration extracted gas heat storage thermal oxidation unit and/or catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit are respectively sent to the oxidation waste heat comprehensive utilization unit for utilization;
(5) And respectively sending the cooling thermal oxidation flue gas from the low-concentration extracted gas heat storage thermal oxidation unit and/or the cooling catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit to the discharge unit for discharge.
Preferably, the method further comprises:
in the step (3), the bleeder valve is used for controlling the circulation condition of the materials in the first thermal oxidation flue gas pipeline, and/or
In the step (3), the discharge valve is used for controlling the circulation condition of the materials in the second thermal oxidation flue gas pipeline.
Preferably, the method further comprises:
and sending the flue gas from the waste heat boiler to the discharge unit for discharge through the flue gas conveying pipeline.
The invention has the beneficial effects that:
(1) According to the system and the method for reducing carbon utilization of the coal mine gas, disclosed by the invention, all economic carbon emission reduction of the coal mine low-concentration extracted gas and the ventilation air methane is realized by a thermal oxidation and catalytic oxidation combined technology, waste is turned into wealth, the methane energy benefit is obtained, the defects of a single technology are overcome, and the combined advantage is exerted;
(2) The system and the method for coal mine gas carbon reduction utilization fully utilize the characteristics of low conversion and construction cost of thermal oxidation to high-quality gas heat energy, combine a waste heat boiler system to perform waste heat utilization to high-temperature heat source-thermal oxidation flue gas and catalytic oxidation flue gas, generate steam to externally supply heat, cool or generate electricity, realize gas carbon emission reduction and obtain energy income at the same time;
(3) According to the system and the method for reducing carbon utilization of coal mine gas, the defect that the low-concentration extracted gas heat-accumulating thermal oxidation unit is high in heat energy loss is overcome, lost heat and redundant heat are sent to the ventilation air methane heat-accumulating catalytic oxidation unit to be utilized through the first thermal oxidation flue gas pipeline and the bleeder valve on the first thermal oxidation flue gas pipeline, the operation temperature of catalytic oxidation reaction in the ventilation air methane heat-accumulating catalytic oxidation unit is improved, the conversion efficiency of ventilation air methane is improved, and when the heating load is small in a non-heating season and the power generation efficiency is low, the heat energy of the low-concentration extracted gas heat-accumulating thermal oxidation unit is mainly sent to the ventilation air methane heat-accumulating catalytic oxidation unit to be utilized, so that the ventilation air methane catalytic oxidation treatment capacity is further improved, the carbon emission reduction is increased, and the carbon emission reduction benefit is increased through energy cascade utilization;
(4) The system and the method for reducing carbon utilization of coal mine gas overcome the defects of low gas concentration, large fluctuation and difficulty in maintaining self-heating balance in a single ventilation air methane catalytic oxidation system, save extra energy input, reduce operation cost, improve operation temperature, improve methane oxidation efficiency, increase ventilation air methane carbon emission reduction, and obtain carbon emission reduction effect and carbon emission reduction benefit by utilizing the heat energy of a low-concentration extraction gas heat storage thermal oxidation unit;
(5) The system and the method for reducing carbon utilization of coal mine gas, disclosed by the invention, have the advantages that the thermal oxidation technology and the catalytic oxidation technology are matched with each other, so that the system is more flexible to operate, practical and economical, and good in environmental benefit.
Drawings
FIG. 1 is a schematic diagram of a system for coal mine gas abatement in one embodiment of the present invention.
Detailed Description
The technical scheme and effects of the present invention are further described below with reference to specific embodiments. The following embodiments/examples are only for illustrating the contents of the present invention, and the present invention is not limited to the following embodiments or examples. Simple modifications of the invention using the inventive concept are within the scope of the invention as claimed.
As shown in figure 1, the system for reducing carbon utilization of coal mine gas comprises a low-concentration extracted gas conveying unit 1, a ventilation air methane collecting and conveying distribution unit 2, a gas blending unit 3, a low-concentration extracted gas heat storage thermal oxidation unit 4, a ventilation air methane heat storage catalytic oxidation unit 6, an oxidation waste heat comprehensive utilization unit and an emission unit which are connected through pipelines,
The inlet of the gas blending unit 3 is respectively connected with the outlets of the low-concentration extracted gas conveying unit 1 and the ventilation air methane collecting and conveying distribution unit 2 and is used for respectively introducing low-concentration extracted gas and ventilation air methane and blending to obtain blended gas;
The low-concentration extracted gas heat storage thermal oxidation unit 4 comprises a blended gas inlet, a gas outlet and a cooling gas outlet, wherein the blended gas inlet is connected to the outlet of the gas blending unit 3 and is used for carrying out thermal oxidation reaction on the blended gas from the gas blending unit 3 to obtain thermal oxidation gas, wherein a part of the gas is output through the cooling gas outlet after being cooled by the heat accumulator, and the rest of the gas is directly output through the thermal gas outlet;
The ventilation air methane heat storage catalytic oxidation unit 6 comprises a ventilation air methane inlet, a flue gas outlet and a cooling flue gas outlet, wherein the ventilation air methane inlet is connected to the ventilation air methane collecting and conveying distribution unit 2 and used for feeding ventilation air methane, the flue gas inlet is connected to the flue gas outlet of the low-concentration extraction gas heat storage thermal oxidation unit 4 and used for feeding thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4 so as to carry out auxiliary heating on ventilation air methane fed into the ventilation air methane heat storage catalytic oxidation unit (6) (comprising the ventilation air methane from the ventilation air methane collecting and conveying distribution unit 2) for catalytic oxidation reaction, and catalytic oxidation flue gas is obtained, wherein one part of the catalytic oxidation flue gas is output through the cooling flue gas outlet of the ventilation air methane after being cooled down by a heat accumulator, and the other part of the catalytic oxidation flue gas is directly output through the thermal flue gas outlet of the ventilation air methane heat storage thermal oxidation unit;
The inlets of the oxidation waste heat comprehensive utilization unit are respectively connected to the hot flue gas outlets of the low-concentration extraction gas heat storage hot oxidation unit 4 and the ventilation air methane heat storage catalytic oxidation unit 6, and are used for utilizing and then cooling part of hot oxidation flue gas from the low-concentration extraction gas heat storage hot oxidation unit 4 and catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit 6 and outputting cooled flue gas;
The inlet of the discharge unit is respectively connected to the cooling flue gas outlet of the low-concentration extraction gas heat storage thermal oxidation unit 4 and the ventilation air methane heat storage catalytic oxidation unit 6 and the flue gas outlet of the oxidation waste heat comprehensive utilization unit, and is used for discharging cooling thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4, cooling catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit 6 and cooling flue gas from the oxidation waste heat comprehensive utilization unit.
According to the system for reducing carbon utilization of coal mine gas, more low-concentration extracted gas and ventilation air methane can be consumed, more heat energy is generated, circulation and effective utilization of the heat energy are achieved, emission reduction of all economic carbon of the coal mine low-concentration extracted gas and the ventilation air methane is achieved, waste materials are changed into valuable materials, methane energy benefits are obtained, the defects of a single technology are overcome, the combined advantage is exerted, the defect that heat loss of a low-concentration extracted gas heat storage thermal oxidation unit is large is overcome, heat loss and redundant heat are sent to the ventilation air methane heat storage catalytic oxidation unit to be utilized, the heat energy utilization rate is improved, the operation temperature of catalytic oxidation reaction in the ventilation air methane heat storage catalytic oxidation unit is improved, and the conversion efficiency of the ventilation air methane is improved.
It is understood by those skilled in the art that the low concentration extracted gas conveying unit 1 is a low concentration extracted gas conveying system commonly used in the art, and comprises an automatic diffusing device, a water seal fire-blocking explosion venting device, an automatic explosion-blocking device, an automatic explosion-prone device, a draught fan, a pipeline valve instrument and the like, the ventilation air gas collecting and conveying distribution unit 2 is a ventilation air gas collecting and conveying distribution system commonly used in the art, and comprises a ventilation air gas collecting cover, a dedusting and demisting device, a pollution discharging device, a draught fan, a ventilation air distribution baffle door and the like, the gas blending unit 3 is a gas blending system commonly used in the art, and comprises a gas blender, a detection instrument device, an explosion venting device and the like, the low concentration extracted gas thermal oxidation unit 4 is a low concentration extracted gas thermal oxidation system commonly used in the art (namely, an RTO system) and comprises a heat accumulator, a gas oxidation reactor, a heating starting device, a flue gas reactor gas distribution valve, a flue gas discharging device, a detection instrument and the like, a thermal oxidation chamber is arranged in the gas oxidation reactor, the ventilation air oxidation catalytic unit 6 is a ventilation air oxidation catalytic oxidation system commonly used in the heat pump, the heat pump oxidation system is a heat pump oxidation system, a heat pump oxidation system is arranged in the heat pump oxidation system, the heat pump oxidation system is a heat-resistant to be used in the heat pump oxidation system, and the heat pump oxidation system is a comprehensive oxidation system is arranged in the heat-resistant to the heat pump oxidation system, and the heat-absorbing system is a heat-absorbing system, and the heat-absorbing system is used in the heat-absorbing and the heat-absorbing system.
In one embodiment, the low-concentration extraction gas thermal oxidation unit 4 is provided with a thermal oxidation chamber, the ventilation air methane thermal oxidation catalytic oxidation unit 6 is provided with a thermal oxidation catalytic chamber, and two ends of a first thermal oxidation flue gas pipeline 51 from the low-concentration extraction gas thermal oxidation unit 4 to the ventilation air methane thermal oxidation catalytic oxidation unit 6 are respectively connected to the thermal oxidation chamber and the thermal oxidation catalytic chamber.
As will be appreciated by those skilled in the art, as described above, the low-concentration extracted gas heat-accumulating thermal oxidation unit 4 comprises a gas oxidation reactor, a heat-accumulating thermal oxidation chamber is arranged in the gas oxidation reactor, the ventilation air methane heat-accumulating catalytic oxidation unit 6 comprises a gas oxidation reactor, and a heat-accumulating catalytic oxidation chamber is arranged in the gas oxidation reactor, and the communication between the low-concentration extracted gas heat-accumulating thermal oxidation unit 4 and the ventilation air methane heat-accumulating catalytic oxidation unit 6 is realized by the communication between the heat-accumulating thermal oxidation chamber and the heat-accumulating catalytic oxidation chamber.
In one embodiment, a bleed valve 511 is disposed on the first thermal oxidation flue gas pipeline 51 from the low concentration extracted gas thermal storage thermal oxidation unit 4 to the ventilation air methane thermal storage catalytic oxidation unit 6, for controlling the circulation conditions of the materials in the first thermal oxidation flue gas pipeline 51, such as cut-off, circulation, flow, and the like, so as to adjust the flow according to the needs.
In one embodiment, a discharge valve 521 is disposed on the second thermal oxidation flue gas pipeline 52 from the low concentration gas extraction heat storage thermal oxidation unit 4 to the oxidation waste heat comprehensive utilization unit, for controlling the circulation condition of the materials in the second thermal oxidation flue gas pipeline 52, such as cut-off, circulation, flow, and the like, so as to adjust according to the needs.
In one embodiment, the emission unit includes a fan 81 and a chimney 82 that are sequentially connected, and are respectively connected to the low concentration extraction gas heat storage thermal oxidation unit 4 and the cooling flue gas outlet of the ventilation air methane heat storage catalytic oxidation unit 6 and the flue gas outlet of the oxidation waste heat comprehensive utilization unit through the inlet of the fan 81, and are used for sending the cooling thermal oxidation flue gas from the low concentration extraction gas heat storage thermal oxidation unit 4 and the cooling catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit 6 and the cooling flue gas from the oxidation waste heat comprehensive utilization unit into the chimney 82 for emission.
In one embodiment, the discharging unit further includes a mixing flue 83, where the mixing flue 83 is disposed at an inlet end of the fan 81, and is configured to receive and buffer the cooled thermal oxidation flue gas from the low-concentration extracted gas thermal storage thermal oxidation unit 4 and the cooled catalytic oxidation flue gas from the ventilation air methane thermal storage catalytic oxidation unit 6 so as to supply the fan 81, so that before the cooled thermal oxidation flue gas from the low-concentration extracted gas thermal storage thermal oxidation unit 4 and the cooled catalytic oxidation flue gas from the ventilation air methane thermal storage catalytic oxidation unit 6 enter the fan 81, the cooled thermal oxidation flue gas is buffered, thereby avoiding system fluctuation and improving system stability.
In one embodiment, the oxidation waste heat comprehensive utilization unit comprises a waste heat boiler 71 and a heat utilization unit 72 which are connected through pipelines, wherein an inlet of the waste heat boiler 71 is respectively connected to a flue gas outlet of the low-concentration extraction gas heat storage thermal oxidation unit 4 and a flue gas outlet of the ventilation air methane heat storage catalytic oxidation unit 6, and is used for introducing the thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4 and the catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit 6 and utilizing heat energy therein to produce steam, and the heat utilization unit 72 is connected to a steam outlet of the waste heat boiler 71 and is used for utilizing steam from the waste heat boiler 71.
In one embodiment, in the oxidation waste heat comprehensive utilization unit, the heat utilization unit comprises a heat supply unit and/or a power generation unit, the heat supply unit comprises any one or a combination of a plurality of mining area heating, cooling and industrial steam, and the power generation unit comprises a steam turbine and a power generator which are sequentially connected.
Those skilled in the art will appreciate that the relevant pipelines of the present invention are provided with corresponding valves to control the circulation of materials.
In one embodiment, the system wherein the ventilation air methane thermal storage catalytic oxidation unit 6 is replaced with a direct catalytic oxidation unit.
It is understood by those skilled in the art that the direct catalytic oxidation unit is a direct catalytic oxidation system (i.e., CO system) commonly used in the art, including high temperature resistant sulfur resistant methane oxidation catalysts, gas oxidation reactors, flue gas in and out reactor gas distribution valves, flue gas heat exchangers, flue gas emission devices, instrumentation, and the like.
In an embodiment, the system further includes the direct catalytic oxidation unit, where the direct catalytic oxidation unit is disposed in parallel with the ventilation air methane heat storage catalytic oxidation unit 6, and is configured to combine the direct catalytic oxidation unit and/or the ventilation air methane heat storage catalytic oxidation unit 6 with the low-concentration extraction gas heat storage thermal oxidation unit 4, effectively utilize heat energy of the low-concentration extraction gas heat storage thermal oxidation unit, improve heat energy utilization rate, and improve conversion efficiency of ventilation air methane in the direct catalytic oxidation unit and/or the ventilation air methane heat storage catalytic oxidation unit 6.
The invention also provides a method for reducing carbon in coal mine gas by using the system, which comprises the following steps:
(1) Respectively feeding the low-concentration extracted gas from the low-concentration extracted gas conveying unit 1 and part of ventilation air methane from the ventilation air methane collecting and conveying distribution unit 2 into the gas blending unit 3 for blending to obtain blended gas;
(2) The blended gas from the gas blending unit 3 is sent into the low-concentration extracted gas heat storage thermal oxidation unit 4 for thermal oxidation reaction, so as to obtain thermal oxidation flue gas, wherein one part of the thermal oxidation flue gas is output through a cooling flue gas outlet after being cooled by a heat storage body of the thermal oxidation flue gas, and the other part of the thermal oxidation flue gas is directly output through a thermal flue gas outlet of the thermal oxidation flue gas;
(3) Sending part of thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4 and part of ventilation air methane from the ventilation air methane collecting and conveying distribution unit 2 into the ventilation air methane heat storage catalytic oxidation unit 6, carrying out catalytic oxidation reaction by using part of thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4 to assist heat part of ventilation air methane from the ventilation air methane collecting and conveying distribution unit 2, and obtaining catalytic oxidation flue gas, wherein one part of catalytic oxidation flue gas is output through a cooling flue gas outlet after being cooled by a heat accumulator of the catalytic oxidation flue gas, and the other part of catalytic oxidation flue gas is directly output through a hot flue gas outlet of the catalytic oxidation flue gas;
(4) Partial thermal oxidation flue gas from the low-concentration extracted gas heat storage thermal oxidation unit 4 and/or catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit 6 are respectively sent into the oxidation waste heat comprehensive utilization unit for utilization;
(5) And respectively sending the cooling thermal oxidation flue gas from the low-concentration extracted gas heat storage thermal oxidation unit 4 and/or the cooling catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit 6 to the discharge unit for discharge.
The method mainly comprises the steps of mixing low-concentration extracted gas with part of ventilation air methane to obtain mixed gas with the concentration of 1-1.5%, enabling the mixed gas to enter a thermal oxidation (RTO) device in a low-concentration extracted gas heat storage thermal oxidation unit 4 to be subjected to high-temperature total oxidation, realizing the cascade utilization of high-grade heat energy under the high-temperature oxidation heat release condition of methane, and sending high Wen Xielou hot flue gas and high-temperature waste heat of the low-concentration extracted gas heat storage thermal oxidation unit 4 into a catalytic oxidation (RCO) device in a ventilation air methane heat storage catalytic oxidation unit 6 to supplement heat required by the RCO device to operate or improve ventilation air methane catalytic oxidation efficiency, wherein the low-concentration extracted gas heat storage thermal oxidation unit 4 and the ventilation air methane heat storage catalytic oxidation unit 6 are in a parallel operation mode during operation. The mixed gas enters the low-concentration extraction gas heat-storage thermal oxidation unit 4 for thermal oxidation without introducing extra fuel to assist oxidation, and part of heat is sent into the ventilation air methane heat-storage catalytic oxidation unit 6, so that the technical problem that ventilation air methane is insufficient in heat value and cannot stably operate when ventilation air methane heat-storage catalytic oxidation is independently carried out is avoided, the minimum methane concentration and oxidation temperature capable of self-maintaining operation are reduced, the utilization efficiency of ventilation air methane is improved, the problem that ventilation air methane and low-concentration gas of a coal mine cannot be directly utilized is solved, and the contradiction of shortage of electric power supply in mining areas is effectively solved.
In one embodiment, the concentration of the ventilation air methane from the ventilation air methane collection and delivery distribution unit 2 is 0.05-0.75% by volume, such as 0.1% by volume, 0.15% by volume, 0.2% by volume, 0.25% by volume, 0.3% by volume, 0.35% by volume, 0.4% by volume, 0.45% by volume, 0.5% by volume, 0.55% by volume, 0.6% by volume, 0.65% by volume, and 0.7% by volume.
In the invention, the concentration of the ventilation air methane refers to the volume concentration of methane in the ventilation air methane.
In one embodiment, the concentration of the low concentration extraction gas from the low concentration extraction gas delivery unit 1 is 1.5-9%, such as 2v%, 2.5v%, 3v%, 3.5v%, 4v%, 4.5v%, 5v%, 5.5v%, 6v%, 6.5v%, 7v%, 7.5v%, 8v% and 8.5v%.
In the invention, the concentration of the low-concentration extracted gas refers to the volume concentration of methane in the low-concentration extracted gas.
In one embodiment, in step (1), the blending ratio is controlled such that the concentration of the resulting blended gas is 1 to 1.5% by volume, such as 1.1% by volume, 1.2% by volume, 1.3% by volume, and 1.4% by volume.
In the present invention, the concentration of the blended gas means the volume concentration of methane in the blended gas.
In one embodiment, in the step (3), the low-concentration gas-extraction heat-storage thermal oxidation unit 4 is preheated to 950 ℃ before the blended gas from the gas blending unit 3 is fed, preferably, when the fed blended gas is heated to 900-1000 ℃ in the gas blending unit (such as 910 ℃, 920 ℃, 930 ℃, 940 ℃, 950 ℃, 960 ℃, 970 ℃, 980 ℃ and 990 ℃), a thermal oxidation reaction is started, rapid oxidation and heat release are started, and high-temperature thermal oxidation flue gas is generated.
Those skilled in the art will appreciate that during the preheating process of the low concentration extraction gas heat storage thermal oxidation unit 4, heat energy is stored in the heat storage therein, and then the blended gas from the gas blending unit 3 is heated.
In one embodiment, in step (2), the reaction temperature of the thermal oxidation reaction is 900-1000 ℃, such as 910 ℃, 920 ℃, 930 ℃, 940 ℃, 950 ℃, 960 ℃, 970 ℃, 980 ℃ and 990 ℃.
In one embodiment, in step (2), after a part of the thermal oxidation flue gas is cooled by the heat accumulator, the output of the thermal oxidation flue gas through the cooling flue gas outlet means that a part of the thermal oxidation flue gas is used for heating the cold side heat accumulator in the low concentration extraction gas heat accumulation thermal oxidation unit 4 to store heat, so as to maintain the stable operation of the thermal oxidation device, and then the thermal oxidation device is cooled by itself, and the obtained cooled thermal oxidation flue gas is output through the cooling flue gas outlet.
In one embodiment, in the step (3), the ventilation air methane thermal storage catalytic oxidation unit 6 is preheated to 600 ℃, and then part of ventilation air methane from the ventilation air methane collecting and conveying distribution unit 2 is introduced, preferably, the heat energy source during preheating comprises part of thermal oxidation flue gas from the low-concentration gas thermal storage thermal oxidation unit 4, preferably, the catalytic oxidation reaction of methane occurs until the introduced ventilation air methane is heated to 350-650 ℃, and rapid catalytic oxidation heat release begins to generate high-temperature catalytic oxidation flue gas, so that the methane is destroyed, and the methane emission is reduced.
Those skilled in the art will understand that in the preheating process, the thermal energy of the ventilation air methane thermal storage catalytic oxidation unit 6 is stored in the thermal storage therein, and then the ventilation air methane from the ventilation air methane collecting and delivering and distributing unit 2 is heated.
In one embodiment, in step (3), the catalytic oxidation reaction has a reaction temperature of 350-650 ℃, such as 400 ℃, 450 ℃, 500 ℃, 550 ℃ and 600 ℃.
In one embodiment, in step (3), the catalyst for the catalytic oxidation reaction is a sulfur-resistant and high temperature-resistant catalyst, such as a platinum-based, palladium-based, or other noble metal catalyst.
In one embodiment, in step (3), after a part of the catalytic oxidation flue gas is cooled by the heat accumulator, the output of the catalytic oxidation flue gas through the cooling flue gas outlet means that a part of the catalytic oxidation flue gas is used for heating the cold side heat accumulator in the ventilation air methane heat accumulating catalytic oxidation unit 6 to store heat, so as to maintain the stable operation of the catalytic oxidation device, and then the catalytic oxidation device is cooled by itself, and the obtained cooled catalytic oxidation flue gas is output through the cooling flue gas outlet.
In one embodiment, the method further comprises:
In the step (3), part of the thermal oxidation flue gas from the low-concentration extracted gas heat storage thermal oxidation unit 4 is sent into the ventilation air methane heat storage catalytic oxidation unit 6 through a first thermal oxidation flue gas pipeline 51;
Preferably, in the step (3), part of the thermal oxidation flue gas from the low-concentration extracted gas thermal oxidation unit 4 is sent from the thermal oxidation chamber to the thermal catalytic oxidation chamber in the ventilation air methane thermal catalytic oxidation unit 6 through a first thermal oxidation flue gas pipeline 51.
Those skilled in the art understand that in the step (3), the catalytic oxidation reaction in the ventilation air methane heat storage catalytic oxidation unit 6 continuously increases the temperature in the heat storage catalytic oxidation chamber under the continuous action of the part of the thermal oxidation flue gas from the low-concentration extracted gas heat storage thermal oxidation unit 4, so as to improve the gas oxidation efficiency.
In one embodiment, the method further comprises:
In the step (4), part of the thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4 is sent into the oxidation waste heat comprehensive utilization unit through the second thermal oxidation flue gas pipeline 52.
Those skilled in the art understand that according to different seasons, the requirements on the heat load of the RTO system are different, and the amount of the thermal oxidation smoke sent into the ventilation air methane heat storage catalytic oxidation unit 6 in the step (3) can be adjusted to increase the heat entering the ventilation air methane heat storage catalytic oxidation unit 6, so that the treatment capacity of the ventilation air methane heat storage catalytic oxidation unit 6 on the ventilation air methane is increased, and the utilization of the controllable amount of the ventilation air methane is realized until all ventilation air methane is utilized.
In one embodiment, in the step (4), during the comprehensive utilization of heat energy, the thermal oxidation flue gas and the catalytic oxidation flue gas are firstly introduced into the waste heat boiler 71 in the oxidation waste heat comprehensive utilization unit to produce steam, then the heat utilization unit 72 utilizes the steam from the waste heat boiler 71, for example, utilizes the steam from the waste heat boiler 71 to keep warm for a mine return air well and supply heat for a plant through a heat exchange station or directly supply steam, and the plant can be self-used by a turbine and a generator or cooled by a heat pump system according to economic requirements in summer;
When the temperature in the ventilation air methane heat storage catalytic oxidation unit 6 is gradually increased, the temperature in the ventilation air methane heat storage catalytic oxidation unit 6 can be reduced by increasing the ventilation air methane treatment capacity, the waste heat of the low-concentration methane heat storage thermal oxidation unit 4 can be fully utilized, the catalytic oxidation flue gas generated in the ventilation air methane heat storage catalytic oxidation unit 6 can be led out, and the catalytic oxidation flue gas is sent into the oxidation waste heat comprehensive utilization unit for comprehensive heat utilization to reduce the temperature in the ventilation air methane heat storage catalytic oxidation unit 6,
When the heat supply requirement of the coal mine is less in summer, the comprehensive power generation economy is low, the carbon emission reduction benefit (CCER carbon market) is high, and all the thermal oxidation flue gas generated by the low-concentration gas heat storage thermal oxidation unit 4 can be sent into the ventilation air methane heat storage catalytic oxidation unit 6, so that the ventilation air methane treatment capacity is further increased, the emission reduction of all ventilation air methane is realized, and the carbon emission reduction benefit is improved;
In winter, the coal mine has larger heat supply requirement, and the redundant part of the hot oxidation flue gas generated by the low-concentration gas heat accumulation and thermal oxidation unit 4 can be mainly sent into the oxidation waste heat comprehensive utilization unit for comprehensive heat utilization.
In one embodiment, the method further comprises:
In step (3), the bleeder valve 511 is used to control the circulation condition, such as cut-off, circulation, flow, etc., of the material in the first thermal oxidation flue gas pipeline 51, and/or
In step (4), the discharge valve 521 is used to control the flow condition of the material in the second thermal oxidation flue gas duct 52, such as cut-off, flow, etc.
In one embodiment, the method further comprises:
And sending the cooling thermal oxidation flue gas from the low-concentration extracted gas heat storage thermal oxidation unit 4 and the cooling catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit 6 into the chimney 82 by using the fan 81 and then discharging.
Preferably, the method further comprises:
In step (5), the mixing flue 83 is used to receive and buffer the cooled thermal oxidation flue gas from the low-concentration extracted gas thermal oxidation unit 4 and the cooled catalytic oxidation flue gas from the ventilation air methane thermal oxidation unit 6 to supply to the fan 81.
In one embodiment, the method further comprises:
In the step (4), the heat oxidation flue gas from the low-concentration extracted gas heat storage thermal oxidation unit 4 and the catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit 6 are introduced into the waste heat boiler 71, and heat energy in the heat oxidation flue gas is utilized to produce steam, and the steam from the waste heat boiler 71 is sent to the heat utilization unit 72 for utilization, so that the gradient utilization of energy is realized.
In one embodiment, the method further comprises:
The flue gas from the waste heat boiler 71 is sent to the discharge unit through the flue gas transporting pipe 711 to be discharged.
The system for reducing carbon utilization of coal mine gas of the invention is operated:
The low-concentration extracted gas heat storage thermal oxidation unit 4 is preheated (such as natural gas heating), then mixed gas is introduced, and the mixed gas is heated and warmed up under the action of a heat accumulator in the mixed gas to perform thermal oxidation reaction, so that high-temperature thermal oxidation flue gas is generated;
After preheating the ventilation air methane heat accumulating catalytic oxidation unit 6 by utilizing part of the thermal oxidation flue gas from the low-concentration extracted gas heat accumulating thermal oxidation unit 4, introducing part of ventilation air methane from the ventilation air methane collecting and conveying distribution unit 2 to heat and raise the temperature under the action of a heat accumulator in the ventilation air methane heat accumulating catalytic oxidation unit to perform catalytic oxidation reaction of methane to destroy the gas, reduce methane emission and generate high-temperature catalytic oxidation flue gas, wherein part of catalytic oxidation flue gas is used for heating an inner cold side heat accumulator of the catalytic oxidation unit to maintain stable operation of the catalytic oxidation unit and then outputting cooling catalytic oxidation flue gas, and part of catalytic oxidation flue gas is directly sent into the oxidation waste heat comprehensive utilization unit.
According to the system and the method for reducing carbon utilization of the coal mine gas, disclosed by the invention, all economic carbon emission reduction of the coal mine low-concentration extracted gas and the ventilation air methane is realized by a thermal oxidation and catalytic oxidation combined technology, waste is turned into wealth, the methane energy benefit is obtained, the defects of a single technology are overcome, and the combined advantage is exerted; the characteristics of low conversion and construction cost of thermal oxidation to gas high-grade heat energy are fully utilized, a waste heat boiler and a power generation and heat supply system are combined, power generation, external heat supply and external cold supply are carried out on high-temperature heat source-thermal oxidation flue gas and catalytic oxidation flue gas, methane carbon emission reduction is realized, energy supply income is obtained at the same time, the defect of large heat energy loss of a low-concentration extraction gas heat storage thermal oxidation unit is overcome, heat loss is sent into the methane heat storage catalytic oxidation unit through the first thermal oxidation flue gas pipeline 51 and a bleeder valve 511 thereon to be utilized, the operation temperature of catalytic oxidation reaction in the methane heat storage catalytic oxidation unit is improved, the conversion efficiency of methane is improved, and when the heating load is low in a non-heating season and the power generation efficiency is low, the heat energy of the low-concentration extraction gas heat storage thermal oxidation unit is mainly sent into the methane heat storage catalytic oxidation unit to be utilized, the methane catalytic oxidation treatment capacity is further improved, the carbon emission reduction is increased, the defect of low-concentration carbon emission reduction is overcome, the self-heating balance is difficult to be maintained when the methane is single methane catalytic oxidation system, the heat energy consumption is increased, the methane heat energy consumption is reduced, the methane emission is reduced, the methane consumption is increased, and the methane oxidation cost is increased, the system and the method for reducing carbon emission of coal mine gas have the advantages that the thermal oxidation technology and the catalytic oxidation technology are matched with each other, so that the system is more flexible to operate, practical, economical and good in environmental benefit and economic benefit.
The invention is further illustrated by the following specific examples.
In the measurement/calculation of the relevant parameters in the following examples and comparative examples of the present invention:
the equivalent of carbon dioxide emission reduction is calculated according to the equivalent of 25 tons of methane emission reduction of 1 ton of destruction;
The selling price of the emission reduction carbon dioxide equivalent CCER carbon transaction is calculated according to 55 yuan/t;
Steam sales price was calculated at 155 yuan/ton;
the number of annual operating hours is calculated according to 8760 hours;
the operation hours of the heating season device are calculated according to 3600h each year;
the hours of non-heating operation per year are calculated according to 5160 hours;
the methane oxidation efficiency in the ventilation air methane heat storage catalytic oxidation unit is designed according to 90%;
the methane oxidation efficiency in the low-concentration extraction gas heat storage thermal oxidation unit is designed according to 99.6%;
the boiler efficiency of the waste heat boiler is designed to be 90 percent.
Example 1 (S1)
The system shown in the figure 1 is utilized to perform carbon reduction and utilization of certain coal mine gas, wherein the on-site direct gas emission comprises low-concentration extracted gas and ventilation air methane, the concentration of the low-concentration extracted gas is 6v%, the emission amount is 4 ten thousand Nm 3/h, the concentration of the ventilation air methane is 0.1v%, and the emission amount is 250 ten thousand Nm 3/h;
The method comprises the following steps:
(1) Feeding all low-concentration extracted gas (4 Nm 3/h) from the low-concentration extracted gas conveying unit 1 and part of ventilation air methane (17.5 Nm 3/h) from the ventilation air methane collecting and conveying distribution unit 2 into the gas blending unit 3 respectively for blending, and outputting blended gas with the concentration of 1.2v and the flow rate of 21.5 Nm 3/h;
(2) Feeding blended gas from the gas blending unit 3 into the low-concentration extraction gas heat storage thermal oxidation unit 4 preheated to 950 ℃ in advance to perform thermal oxidation reaction to release heat, generating 950 ℃ thermal oxidation flue gas, wherein 74.6% of the thermal oxidation flue gas enters a heat storage chamber in the low-concentration extraction gas heat storage thermal oxidation unit 4 to heat a heat storage body in the low-concentration extraction gas heat storage thermal oxidation unit to be used for maintaining self-heating balance, cooling the low-concentration extraction gas heat storage thermal oxidation unit by itself, outputting the low-concentration extraction gas heat storage thermal oxidation unit through a cooling flue gas outlet, and directly outputting the rest 25.4% of thermal oxidation flue gas through a flue gas outlet;
(3) During the heating season, 100% of the thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4 is sent to an oxidation waste heat comprehensive utilization unit and heated by the waste heat boiler 71 to generate steam for on-site heat demand, and 10.2 ten thousand tons of thermal steam is generated per heating season;
During a heating season, the low-concentration extracted gas heat storage thermal oxidation unit 4 (RTO) processes the ventilation air methane quantity of 17.5 ten thousand m 3/h, reduces the methane emission quantity in the ventilation air methane to be approximately 0.125t/h, reduces the methane emission quantity in the extracted gas to be approximately 1.705t/h, and reduces the total emission reduction CO 2 equivalent to be approximately 45.8t/h (the total emission reduction CO 2 equivalent during the heating season is approximately 16.5 ten thousand tons);
During the heating season, the ventilation air methane heat accumulating catalytic oxidation unit 6 (RCO) is used for treating ventilation air methane with the ventilation air methane quantity of 0 ten thousand m 3/h, and the emission reduction CO 2 equivalent is nearly 0t/h (the total emission reduction CO 2 equivalent during the heating season is about 0 ten thousand tons).
(4) During non-heating season, when there is no other energy consumption requirement such as heat supply, or when the low concentration extraction gas heat storage thermal oxidation unit 4 rejects heat in an overtemperature way, the bleeder valve 511 is opened, the valve 521 is closed, and the thermal oxidation flue gas from the low concentration extraction gas heat storage thermal oxidation unit 4 (all the thermal oxidation flue gas directly output through the flue gas outlet) is sent into the ventilation air methane heat storage catalytic oxidation unit 6 to preheat the heat storage catalytic oxidation chamber to 600 ℃;
Then, part of ventilation air methane (225.5 Nm 3/h) from the ventilation air methane collecting and conveying distribution unit 2 is introduced into the ventilation air methane heat accumulating catalytic oxidation unit 6 to perform catalytic oxidation reaction of methane to release heat and generate 650 ℃ catalytic oxidation flue gas, wherein one part of the catalytic oxidation flue gas is cooled by a heat accumulator and then is output through a cooling flue gas outlet, the other part of the catalytic oxidation flue gas is directly output through a flue gas outlet,
Under the condition that the heat is supplemented by the hot oxidation flue gas discharged by the discharge valve 511, the ventilation air methane realizes stable catalytic oxidation;
During a non-heating season, the low-concentration extracted gas heat-accumulating thermal oxidation unit 4 (RTO) processes the ventilation air methane quantity of 17.5 ten thousand m 3/h, reduces the methane emission quantity in the ventilation air methane to be approximately 0.125t/h, reduces the methane emission quantity in the extracted gas to be approximately 1.705t/h, and reduces the total emission reduction CO 2 equivalent to be approximately 45.8t/h (the total emission reduction CO 2 equivalent during the non-heating season is approximately 23.6 ten thousand tons);
During a non-heating season, the ventilation air methane heat accumulating catalytic oxidation unit 6 (RCO) processes the ventilation air methane with 225.5 ten thousand m 3/h, reduces the methane emission in the ventilation air methane to be approximately 1.61t/h, and reduces the emission CO 2 equivalent to be approximately 40.3t/h (the total emission CO 2 equivalent during the non-heating season is approximately 20.8 ten thousand tons);
(5) And respectively sending the cooling thermal oxidation flue gas from the low-concentration extracted gas heat storage thermal oxidation unit 4, the cooling catalytic oxidation flue gas from the ventilation air methane heat storage catalytic oxidation unit 6 and the cooling flue gas from the oxidation waste heat comprehensive utilization unit to the discharge unit for discharge.
In example 1, in the on-site direct gas emission, the total emission reduction amount of methane is about 2.44 ten thousand t/year, the total emission reduction equivalent of CO 2 is about 60.89 ten thousand t/h, the 3349.2 ten thousand yuan/year carbon emission reduction income can be increased, the 1580.6 ten thousand yuan/year energy supply income is increased, and the total income is 4929.8 ten thousand yuan/year.
Example 2 (S2)
The carbon reduction of certain coal mine gas was performed in the same manner as in example 1, with the following differences compared with example 1:
According to the field energy supply requirement:
In the step (3), 80% of the hot oxidation flue gas from the low-concentration extraction gas heat storage and thermal oxidation unit 4 is sent to a waste heat boiler 71 in an oxidation waste heat comprehensive utilization unit for heating in a heating season, 20% is sent to the ventilation air methane heat storage and catalytic oxidation unit 6 (RCO), wherein,
During the heating season, 10.2 ten thousand tons of hot steam are generated per heating season;
During a heating season, the low-concentration extracted gas heat storage thermal oxidation unit 4 (RTO) processes the ventilation air methane quantity of 17.5 ten thousand m 3/h, reduces the methane emission quantity in the ventilation air methane to be approximately 0.125t/h, reduces the methane emission quantity in the extracted gas to be approximately 1.705t/h, and reduces the total emission reduction CO 2 equivalent to be approximately 45.8t/h (the total emission reduction CO 2 equivalent during the heating season is approximately 16.5 ten thousand tons);
During heating season, the ventilation air methane heat accumulating catalytic oxidation unit 6 (RCO) processes the ventilation air methane 45.1 ten thousand m 3/h, reduces the methane emission in the ventilation air methane to be approximately 0.32t/h, reduces the emission CO 2 equivalent to be approximately 8.1t/h (the total emission CO 2 equivalent during heating season is approximately 2.9 ten thousand tons)
In the step (4), in a non-heating season, 20% of the thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4 is sent to a waste heat boiler 71 in an oxidation waste heat comprehensive utilization unit for heating, 80% is sent to the ventilation air methane heat storage catalytic oxidation unit 6 (RCO), and the ventilation air methane quantity from the ventilation air methane collection and transportation distribution unit 2 which is introduced into the ventilation air methane heat storage catalytic oxidation unit 6 is 180.4 ten thousand Nm 3/h,
During a non-heating season, the low-concentration extracted gas heat-accumulating thermal oxidation unit 4 (RTO) processes the ventilation air methane quantity of 17.5 ten thousand m 3/h, reduces the methane emission quantity in the ventilation air methane to be approximately 0.125t/h, reduces the methane emission quantity in the extracted gas to be approximately 1.705t/h, and adds up approximately 45.8t/h CO 2 equivalent (the total emission reduction CO 2 equivalent during the non-heating season is approximately 23.6 ten thousand tons);
During the non-heating season, the ventilation air methane heat accumulating catalytic oxidation unit 6 (RCO) is used for treating 180.4 ten thousand m 3/h of ventilation air methane, reducing methane emission in the ventilation air methane by approximately 1.29t/h, and reducing emission CO 2 equivalent by approximately 32.2t/h (the total emission reduction CO 2 equivalent during the non-heating season is approximately 16.6 ten thousand tons).
In example 2, in the on-site direct gas emission, the total emission reduction amount of methane is about 2.39 ten thousand t/year, the total emission reduction equivalent of CO 2 is about 59.64 ten thousand t/h, the 3280.1 ten thousand yuan/year carbon emission reduction income can be increased, the 1717.5 ten thousand yuan/year energy supply income is increased, and the total income is 4997.6 ten thousand yuan/year.
Comparative example 1 (D1)
The same parameters are adopted to carry out the carbon reduction and utilization of the gas in a certain coal mine only by using the low-concentration extraction gas heat storage and thermal oxidation unit 4 (RTO system) in the system shown in the figure 1, and compared with the embodiment 1, the method has the following differences:
in the step (3), 100% of the thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4 is sent to the waste heat boiler 71 in the oxidation waste heat comprehensive utilization unit for heating in a heating season,
During the heating season, 10.2 ten thousand tons of hot steam are generated per heating season;
During a heating season, the low-concentration extracted gas heat storage thermal oxidation unit 4 (RTO) processes the ventilation air methane quantity of 17.5 ten thousand m 3/h, reduces the methane emission quantity in the ventilation air methane to be approximately 0.125t/h, reduces the methane emission quantity in the extracted gas to be approximately 1.705t/h, and reduces the total emission reduction CO 2 equivalent to be approximately 45.8t/h (the total emission reduction CO 2 equivalent during the heating season is approximately 16.5 ten thousand tons);
in the step (4), in a non-heating season, no other energy requirements such as heat supply and the like exist, and meanwhile, no RCO system exists, so that the RTO system does not operate;
in the step (5), the cooling thermal oxidation flue gas from the low-concentration extraction gas heat storage thermal oxidation unit 4 and/or the cooling flue gas from the oxidation waste heat comprehensive utilization unit are respectively sent to the discharge unit for discharge.
In comparative example 1, in the on-site direct emission gas, the total emission reduction amount of methane is about 0.66 ten thousand t/year, the total emission reduction equivalent of CO 2 is about 16.5 ten thousand t/h, the carbon emission reduction benefits of 907.5 ten thousand yuan/year can be increased, the energy supply income of 1580.6 ten thousand yuan/year is increased, and the total income is 2488.5 ten thousand yuan/year.
For the RTO system which is independently operated, the RTO system can be operated under full load in a heating season, but in a non-heating season, the capacity of absorbing the generated redundant heat is limited, the current economic benefits of steam turbine power generation and the like are poor, the operation difficulty is high, particularly the small-scale gas quantity is high, the operation of a steam generator set is selected to be not matched with the construction of the steam generator set, and the operation is only carried out in the heating season and is not carried out in the non-heating season.
For independently operating the RCO system or the RTO system, especially when the gas concentration is lower (< 0.2%), the RCO system has higher operation cost because of introducing an additional heat source, and the independent operation of the RCO system has higher ventilation air methane treatment difficulty and is not easy to popularize.
The relevant parameters of examples 1-2 (S1-2) and comparative example 1 (D1) were measured and calculated, and the results are shown in Table 1.
TABLE 1 results for example 1 (S1-2) and comparative example 1 (D1)
From examples 1-2 and comparative example 1, table 1 shows that:
Compared with comparative example 1, the annual emission reduction CO 2 equivalent in the embodiments 1-2 of the invention is increased to about 4 times of the annual emission reduction CO 2 equivalent, the annual income is increased to about 2 times of the annual emission reduction CO 2 equivalent or more, the carbon emission reduction effect is obvious, the environmental protection effect is good, and the economic benefit is high.
Claims (10)
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| CN202310936941.5A Pending CN119367986A (en) | 2023-07-27 | 2023-07-27 | System and method for reducing carbon utilization of coal mine gas |
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| Country | Link |
|---|---|
| CN (1) | CN119367986A (en) |
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2023
- 2023-07-27 CN CN202310936941.5A patent/CN119367986A/en active Pending
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