CN111121067A - Method for utilizing low-concentration gas - Google Patents
Method for utilizing low-concentration gas Download PDFInfo
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- CN111121067A CN111121067A CN201911161473.9A CN201911161473A CN111121067A CN 111121067 A CN111121067 A CN 111121067A CN 201911161473 A CN201911161473 A CN 201911161473A CN 111121067 A CN111121067 A CN 111121067A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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Abstract
The invention discloses a method for utilizing low-concentration gas, which comprises the following steps: providing gas with methane concentration lower than 30 mol% by using a gas pump room; supplying a part of the gas supplied by the gas pump room to the mixer by using the low-concentration gas delivery guarantee unit to be mixed with the air; supplying the mixed gas to a gas heat storage oxidation device for oxidation treatment to obtain high-temperature flue gas and oxidized tail gas; supplying a part of the high-temperature flue gas to a refrigeration unit to prepare low-temperature water and refrigeration tail gas; supplying another part of the high-temperature flue gas to a heating unit to exchange heat with cold water to obtain high-temperature steam and heat exchange tail gas; and supplying a part of the gas provided by the gas pump room to a gas generator set by using the low-concentration gas conveying and guaranteeing unit for combustion to generate power, and generating combustion smoke. The method solves the problems of coal-fired pollution environment and shortage of gas consumption of natural gas and high-concentration gas, realizes efficient utilization of low-concentration gas and avoids waste of the low-concentration gas.
Description
Technical Field
The invention belongs to the technical field of gas utilization, and particularly relates to a method for utilizing low-concentration gas.
Background
At present, a cold, heat and electricity triple supply scheme based on natural gas is a main distributed energy solution for office buildings, hospitals, hotels, markets and other buildings at present, and the triple supply scheme has a price advantage in areas rich in natural gas compared with pure electricity.
The main technical approach of the cold, heat and electricity triple supply scheme taking natural gas as energy is as follows: the natural gas enters a gas engine, and the gas engine is connected with a generator to generate electric energy to supply power to the outside; the high-temperature flue gas of the gas engine is divided into two parts, one part enters a steam boiler to generate high-temperature steam, and the high-temperature steam is used for heating in winter; one part of the cold water enters a lithium bromide absorption refrigerating unit, and cold water is generated in summer and is used for refrigerating; the scheme utilizes the evacuated high-temperature flue gas for refrigeration and steam generation, reduces the consumption of external electric energy, and can effectively save electric charge.
The existing cold, heat and electricity triple supply based on natural gas has certain advantages compared with pure electricity triple supply in places with rich natural gas resources and low natural gas price, but the natural gas resources in China are deficient at present, the natural gas price in most regions is high, and the natural gas supply is restricted in the natural gas consumption peak. If a common gas boiler is used, the requirement on the concentration of gas is high, the concentration of methane is required to be at least more than 30 mol%, the direct combustion of the gas with the concentration of less than 30 mol% has the risk of explosion, and if the concentration of the gas is less than 5 mol%, the gas cannot be ignited because the concentration of the methane is too low. Therefore, at present, high-concentration gas with the concentration of more than 30 mol% can be directly combusted, 8-20 mol% of gas is used for power generation, gas with the concentration of less than 8 mol% is basically directly discharged, energy is wasted, the environment is polluted, high-temperature tail gas generated by gas power generation at present is directly discharged, and energy of the high-temperature tail gas is wasted.
Therefore, how to effectively utilize the gas with low concentration needs to be further researched and researched.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a method for utilizing low-concentration gas, which can use low-concentration gas to replace coal, natural gas and high-concentration gas to realize combined supply of cold, heat and electricity, thereby solving the problems of environmental pollution caused by coal and gas shortage caused by natural gas and high-concentration gas, and realizing efficient utilization of low-concentration gas to avoid waste of low-concentration gas.
In one aspect of the invention, a method of utilizing low-concentration gas is provided. According to an embodiment of the invention, the method comprises:
providing gas with methane concentration lower than 30 mol% by using a gas pump room;
supplying a part of the gas supplied by the gas pump room to a mixer by using a low-concentration gas delivery guarantee unit to be mixed with air so as to obtain mixed gas with the methane concentration not higher than 1.2 mol%;
supplying the mixed gas to a gas heat storage oxidation device for oxidation treatment so as to obtain high-temperature flue gas and oxidized tail gas;
supplying a part of the high-temperature flue gas to a refrigeration unit to prepare low-temperature water and refrigeration tail gas;
supplying another part of the high-temperature flue gas to a heating unit to exchange heat with cold water so as to obtain high-temperature steam and heat exchange tail gas;
and supplying a part of the gas supplied by the gas pump room to a gas generator set by using a low-concentration gas conveying and guaranteeing unit to generate power by combustion, and generating combustion smoke.
According to the method for utilizing the low-concentration gas, part of the gas provided by the gas pump room and having the methane concentration of less than 30 mol% is supplied to the mixer to be mixed with the air after being conveyed by the low-concentration gas conveying and guaranteeing unit, the obtained mixed gas with the methane concentration of not more than 1.2 mol% is supplied to the gas heat storage and oxidation device to be oxidized, part of the obtained high-temperature flue gas can be supplied to the refrigerating unit to obtain low-temperature water which can be used for refrigerating buildings, hospitals and other office buildings, and the other part of the obtained high-temperature flue gas is supplied to the heating unit to generate high-temperature steam which can be used for heating buildings, hospitals and other office buildings, and the other part of the gas with the methane concentration of less than 30 mol% after being conveyed by the low-concentration gas conveying and guaranteeing unit is supplied to the gas generator unit to generate electricity, the invention uses low-concentration gas to replace coal, natural gas and high-concentration gas to realize cold, heat and electricity triple supply, thereby solving the problems of environmental pollution caused by coal and gas shortage for natural gas and high-concentration gas (especially the peak of gas consumption in winter), and realizing high-efficiency utilization of the low-concentration gas and avoiding waste of the low-concentration gas.
In addition, the method of using low-concentration gas according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the refrigeration unit is a lithium bromide refrigeration unit. Therefore, high-efficiency utilization of high-temperature flue gas can be realized.
In some embodiments of the invention, the heating unit is a steam boiler. Therefore, high-efficiency utilization of high-temperature flue gas can be realized.
In some embodiments of the invention, the method further comprises: supplying the other part of the high-temperature flue gas to a fresh air heat exchanger to exchange heat with air so as to obtain hot air; the hot air is mixed with cold air provided by the fresh air fan to exchange heat and then is supplied to the shaft, so that high-efficiency utilization of high-temperature flue gas can be realized.
In some embodiments of the invention, a portion of the combustion flue gas is fed to the refrigeration unit and/or the heating unit for utilization. From this, can realize that gas generating set produces the high-efficient utilization of burning flue gas.
In some embodiments of the invention, the method further comprises: and supplying a part of the combustion flue gas to a hot water heat exchanger to exchange heat with cold water to generate hot water. From this, can realize that gas generating set produces the high-efficient utilization of burning flue gas.
In some embodiments of the invention, a first regulating valve is arranged between the low-concentration gas transmission guaranteeing unit and the mixer, and a second regulating valve is arranged between the low-concentration gas transmission guaranteeing unit and the gas generator set.
In some embodiments of the invention, the method further comprises: and adjusting the opening degrees of the first adjusting valve and the second adjusting valve according to the display of the methane sensor by using an intelligent mixing unit respectively connected with the first adjusting valve, the second adjusting valve and the methane sensor at the front end of the gas pump room. Thus, effective use of low-concentration gas can be achieved.
In some embodiments of the present invention, a third regulating valve is disposed between the refrigeration unit and the gas heat storage and oxidation device, a fourth regulating valve is disposed between the fresh air heat exchanger and the gas heat storage and oxidation device, a fifth regulating valve is disposed between the heating unit and the gas heat storage and oxidation device, a sixth regulating valve is disposed between the gas generator set and the heating unit, a seventh regulating valve is disposed between the gas generator set and the fresh air heat exchanger, and an eighth regulating valve is disposed between the hot water heat exchanger and the gas generator set.
In some embodiments of the invention, the method further comprises: the intelligent control allocation unit connected with the power distribution equipment at the rear end of the methane sensor and the gas generator set is used for adjusting the opening degrees of the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve, the fifth regulating valve, the sixth regulating valve, the seventh regulating valve and the eighth regulating valve according to the display of the methane sensor and the power load of the power distribution equipment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow diagram of a method for utilizing low-concentration gas according to an embodiment of the present invention;
FIG. 2 is a schematic view of a system configuration employed in a method of using a low concentration gas according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for utilizing low-concentration gas according to still another embodiment of the present invention;
fig. 4 is a schematic view of a system structure employed in a method of using low-concentration gas according to still another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In one aspect of the invention, a method of utilizing low-concentration gas is provided. Referring to fig. 1-4, the method includes, according to an embodiment of the invention:
s100: providing gas with methane concentration less than 30 mol% by using gas pump house
In the step, the gas pump room 100 is used for providing gas with the methane concentration lower than 30 mol%, preferably 0.6-20 mol%, and the front end of the gas pump room 100 is provided with the methane sensor 11 for monitoring the methane concentration in the gas in real time.
S200: part of the gas supplied by the gas pump room is supplied to the mixer by the low-concentration gas delivery guarantee unit to be mixed with the air
In this step, the low-concentration gas transportation assurance unit 200 is connected to the gas pump house 100 and the mixer 300, respectively, that is, a part of the gas supplied from the gas pump house 100 is safely supplied to the mixer 300 by the low-concentration gas transportation assurance unit 200 to be mixed with air, so as to obtain a mixed gas having a methane concentration of not higher than 1.2 mol%, preferably 0.6 to 1.2 mol%, more preferably 1 to 1.2 mol%, so that the obtained mixed gas has a concentration satisfying the working methane concentration of a subsequent gas thermal oxidation apparatus. Specifically, the low concentration gas safety transportation guarantee unit comprises tertiary safety protection, is respectively: the explosion-proof valve, the powder injection explosion suppression device and the water seal fire-retardant explosion venting device can guarantee the conveying safety of low-concentration gas, prevent an accidental fire source generated at the rear end from being transmitted into a gas pump room, have the same structure as a low-concentration gas safety conveying guarantee system developed by Chongqing research institute Limited company of the China coal science group, and are not described again.
S300: supplying the mixed gas to a gas heat-storage oxidation device for oxidation treatment
In this step, the gas heat-storage oxidation device 400 is connected to the mixer 300, and is adapted to supply the mixed gas obtained in the mixing process of the mixer to the gas heat-storage oxidation device for oxidation treatment, so as to obtain high-temperature flue gas and oxidized tail gas. Specifically, the working concentration of methane in the gas heat storage and oxidation device is not higher than 1.2 mol%, preferably 0.6-1.2 mol%, more preferably 1-1.2 mol%, the device can safely and stably oxidize the mixed gas with the concentration of methane lower than 1.2 mol% and produce oxidized tail gas and high-temperature flue gas at about 900 ℃, and the obtained oxidized tail gas is directly discharged through a chimney. The inventors found that the problem that the gas having a methane concentration of less than 5 mol% cannot be directly combusted and the problem that the gas is exploded when the methane concentration is 5 to 15 mol% in the prior art can be solved by supplying the mixed gas having a methane concentration of less than 1.2 mol% to the gas heat storage and oxidation device for oxidation, and the problem that the low-concentration gas cannot be used in the prior art can be effectively solved by supplying the low-concentration gas to the mixer and then to the gas heat storage and oxidation device in the present application. It should be noted that, the gas heat accumulation oxidation device in the present application is an existing device, and is not described herein again.
S400: part of the high-temperature flue gas is supplied to a refrigeration unit to prepare low-temperature water and refrigeration tail gas
In this step, the refrigeration unit 500 is connected to the gas thermal storage oxidation apparatus 400, and is adapted to supply a part of the high-temperature flue gas obtained in the gas thermal storage oxidation apparatus to the refrigeration unit to prepare low-temperature water and refrigeration tail gas, where the low-temperature water may be used for refrigeration of office buildings and the like, and the obtained refrigeration tail gas is discharged through a chimney. Preferably, the refrigeration unit is a lithium bromide refrigeration unit, so that the heat exchange efficiency of high-temperature flue gas is improved.
S500: supplying another part of the high-temperature flue gas to a heating unit to exchange heat with cold water
In this step, the heating unit 600 is connected to the gas thermal storage oxidation apparatus 400, and another part of the high-temperature flue gas obtained in the gas thermal storage oxidation apparatus is supplied to the heating unit to exchange heat with cold water, so as to obtain high-temperature steam and heat exchange tail gas, the obtained high-temperature steam can be used for heating in office buildings and the like, and the obtained heat exchange tail gas is discharged through a chimney. Preferably, the heating unit is a steam boiler, so that the heat exchange efficiency of high-temperature flue gas is improved.
S600: supplying a part of the gas supplied by the gas pump room to the gas generator set by using the low-concentration gas delivery guarantee unit for combustion power generation
In this step, the gas generator set 700 is connected to the low concentration gas delivery guarantee unit 200, and a further part of the gas supplied from the gas pump room is supplied to the gas generator set by the low concentration gas delivery unit to be combusted and generated, and combustion flue gas is generated. Specifically, the gas generator set 700 includes the gas engine 71 and the generator 72, a part of gas passing through the low-concentration gas delivery guarantee unit 200 is combusted in the gas engine 71 to do work, and high-temperature flue gas is generated at the same time, and is discharged through the chimney, the gas engine 71 drives the generator 72 to generate electricity, the generated electric energy enters the power distribution equipment and then is delivered to the power load, and meanwhile, the power distribution equipment can also receive the power supply of an external power grid to be used as the supplement and the safe standby power supply of the power load.
According to the method for utilizing the low-concentration gas, part of the gas provided by the gas pump room and having the methane concentration of less than 30 mol% is supplied to the mixer to be mixed with the air after being conveyed by the low-concentration gas conveying and guaranteeing unit, the obtained mixed gas having the methane concentration of less than 1.2 mol% is supplied to the gas heat storage and oxidation device to be oxidized, part of the obtained high-temperature flue gas can be supplied to the refrigeration unit to obtain low-temperature water which can be used for refrigeration of office buildings such as buildings or hospitals, the other part of the obtained high-temperature flue gas is supplied to the heating unit to generate high-temperature steam which can be used for heating of the office buildings such as the buildings or the hospitals, and the other part of the gas having the methane concentration of less than 30 mol% after being conveyed by the low-concentration gas conveying and guaranteeing unit is supplied to the gas generator unit to generate electricity, the invention uses low-concentration gas to replace coal, natural gas and high-concentration gas to realize cold, heat and electricity triple supply, thereby solving the problems of environmental pollution caused by coal and gas shortage for natural gas and high-concentration gas (especially the peak of gas consumption in winter), and realizing high-efficiency utilization of the low-concentration gas and avoiding waste of the low-concentration gas.
Further, in order to achieve maximum utilization of high-temperature flue gas in the gas thermal storage oxidation device, referring to fig. 3 and 4, the method for utilizing low-concentration gas further comprises:
s700: the other part of the high-temperature flue gas is supplied to a fresh air heat exchanger to exchange heat with air
In this step, the fresh air heat exchanger 800 is connected to the gas heat storage and oxidation device 200, and is adapted to supply another part of the high-temperature flue gas obtained in the gas heat storage and oxidation device 200 to the fresh air heat exchanger for heat exchange with air, so as to obtain hot air. It should be noted that, a person skilled in the art can adjust the temperature of the hot air according to actual needs, as long as the hot air can be mixed with cold air subsequently to meet the heating needs of the shaft.
S800: the hot air and the cold air provided by the fresh air fan are supplied to a shaft after heat exchange and mixing
In this step, the fresh air fan 900 is connected to the fresh air heat exchanger 800, and is adapted to heat-exchange and mix the hot air obtained by the fresh air heat exchanger and the cold air provided by the fresh air fan, and supply the mixture to the shaft. Specifically, in northern coal mines, a shaft needs to be heated and prevented from freezing in winter, the heat demand is very high, the shaft is heated by high-temperature gas generated by a coal-fired hot air furnace in the traditional method and is limited by environmental protection, the coal-fired hot air furnace is basically replaced by a natural gas furnace or a gas furnace at present, hot air obtained by supplying high-temperature flue gas after low-concentration gas is oxidized to a fresh air heat exchanger is mixed with cold air of a fresh air fan and then supplied to the shaft for underground heating, the environmental protection problem generated by the traditional method can be fundamentally solved, and the resource utilization of the low-concentration gas is realized. It should be noted that, a person skilled in the art can select a mixing ratio of the hot air and the cold air supplied by the fresh air blower according to actual needs as long as the mixing ratio can meet actual needs of the shaft.
Further, referring to fig. 3 and 4, in order to realize resource utilization of the combustion flue gas obtained by the gas-fired power generator set, the method for utilizing the low-concentration gas further includes:
s900: part of the combustion flue gas is supplied to a refrigeration unit and/or a heating unit for utilization
In this step, the gas generator set 700 is connected to at least one of the refrigeration unit 500 and the heating unit 600, and is adapted to supply a part of the combustion flue gas obtained in the gas generator set 700 to the refrigeration unit 500 and/or the heating unit 600 for use, thereby realizing efficient use of the waste heat of the combustion flue gas, and improving maximum use of the low-concentration gas.
S1000: supplying a part of the combustion flue gas to a hot water heat exchanger to exchange heat with cold water to generate hot water
In this step, the hot water heat exchanger 1000 is connected to the gas generator set 700, and a further portion of the combustion flue gas obtained by the gas generator set 700 is supplied to the hot water heat exchanger to exchange heat with cold water to generate hot water, which can be used as domestic hot water, such as bathing. It should be noted that, a person skilled in the art can select the obtained hot water temperature according to actual needs, and details are not described herein.
Further, referring to fig. 1 to 4, the method for utilizing low-concentration gas further includes:
s1100: the intelligent mixing unit is utilized to adjust the opening degrees of the first regulating valve and the second regulating valve according to the display of the methane sensor
In this step, a first regulating valve 31 is provided between the low-concentration gas delivery guarantee unit 200 and the mixer 300, a second regulating valve 73 is provided between the low-concentration gas delivery guarantee unit 200 and the gas generator set 700, the intelligent mixing unit 1100 is respectively connected to the first regulating valve 31, the second regulating valve 73 and the methane sensor 11 at the front end of the gas pump house 100, and the opening degrees of the first regulating valve 31 and the second regulating valve 73 are adjusted according to the display of the methane sensor 11 by the intelligent mixing unit 1100. Specifically, the gas heat storage and oxidation device requires that the concentration of methane in mixed gas is not higher than 1.2 mol%, the concentration of methane in gas before mixing fluctuates below 30 mol%, especially when underground extraction is abnormal, the change of the concentration of methane in gas before mixing is severe, if no intelligent mixing unit is provided, the concentration of mixed gas exceeds 1.2 mol% at any time, the intelligent mixing unit monitors the concentration of methane in gas in advance by installing a methane sensor at the front end of a gas pump room, sends an instruction to the first regulating valve in advance, adjusts the opening degrees of the first regulating valve and the second regulating valve in advance, adjusts the gas amount entering the mixer and the gas generator set, and finally keeps the concentration of mixed gas methane not higher than 1.2%. It should be noted that the intelligent mixing and blending unit is any device capable of implementing the above functions in the prior art, and is not described herein again.
Further, referring to fig. 1 to 4, the method for utilizing low-concentration gas further includes:
s1200: the intelligent control allocation unit is used for adjusting the opening degrees of the first to eighth adjusting valves according to the display of the methane sensor and the power load of the power distribution equipment
In this step, a third regulating valve 51 is provided between the refrigeration unit 500 and the gas heat storage oxidation device 400, a fourth regulating valve 81 is provided between the fresh air heat exchanger 800 and the gas heat storage oxidation device 400, a fifth regulating valve 61 is provided between the heating unit 600 and the gas heat storage oxidation device 400, a sixth regulating valve 74 is provided between the gas generator set 700 and the heating unit 600, a seventh regulating valve 75 is provided between the gas generator set 700 and the fresh air heat exchanger 800, an eighth regulating valve 76 is provided between the hot water heat exchanger 1000 and the gas generator set 700, the intelligent control allocation unit 1200 is respectively connected with the first regulating valve 31, the second regulating valve 73, the third regulating valve 51, the fourth regulating valve 81, the fifth regulating valve 61, the sixth regulating valve 74, the seventh regulating valve 75, the eighth regulating valve 76, the methane sensor 11 and the power distribution equipment 77 at the rear end of the gas generator set 700, and the intelligent control allocation unit 1200 adjusts the power consumption of the first regulating valve according to the display Opening degrees of the throttle valve 31, the second regulating valve 73, the third regulating valve 51, the fourth regulating valve 81, the fifth regulating valve 61, the sixth regulating valve 74, the seventh regulating valve 75, and the eighth regulating valve 76. The specific control and blending is as follows: and adjusting the second adjusting valve and the first adjusting valve according to the methane concentration, the electric load, the environmental temperature and the like of the gas so as to adjust the gas quantity entering the gas generator set and the gas heat storage and oxidation device. For example, at night, office staff are reduced, the electric load is low, the ambient temperature is reduced, the heating load of the air shaft is increased, the opening degree of the first regulating valve is automatically increased by the system, the gas amount entering the thermal storage oxidation device is increased, and the opening degree of the second regulating valve is reduced. Meanwhile, the opening degree of the eighth regulating valve is reduced, the domestic hot water supply is reduced, the opening degree of the sixth regulating valve is reduced, so that heating is reduced, the opening degree of the seventh regulating valve is increased, more high-temperature flue gas of the gas generator set enters the fresh air heat exchanger, the opening degree of the fifth regulating valve is also reduced, and the opening degree of the fourth regulating valve is increased to increase the amount of the flue gas entering the fresh air heat exchanger. And meanwhile, the load of an external power grid is reduced, and the consumption of the external power grid is reduced. It should be noted that the intelligent control allocating unit is any device capable of implementing the above functions in the prior art, and is not described herein again.
The method for utilizing the low-concentration gas according to the embodiment of the invention has one of the following technical effects:
(1) in the prior art, coal, natural gas and high-concentration gas are used as primary energy to realize combined supply of cold, heat and electricity. The coal-fired method for realizing shaft heating and heating is limited in the northern heating season at present and is forcibly eliminated due to the environmental protection. The use of natural gas as a primary energy source is mainly expensive, and during the peak of gas consumption in winter, the natural gas is not supplied enough and may be out of gas. When high-concentration gas is used as primary energy, the concentration of methane must be ensured, and generally, when the concentration is lower than 30 mol%, higher risk exists. Because the explosion limit of methane is 5-15 mol%. Therefore, the high-concentration gas is generally burnt directly at a concentration of 30 mol% or more. The invention adopts low-concentration gas with methane less than 30 mol% to replace coal, natural gas and high-concentration gas, and the low-concentration gas is used as primary energy to realize triple co-generation. The utilization of the low-concentration gas exhausted in the past reduces the consumption of the traditional primary energy, saves the energy expenditure of a coal mine, and reduces the emission of the gas. When the concentration of the gas is 8-20 mol%, the gas can be used for a heat storage oxidation device and can also enter a gas generator set; when the gas concentration is less than 8 mol% (more than 0.6 mol%), the system cannot generate electricity by combustion, but can store heat and oxidize, so that almost all the low-concentration gas can be used by the system.
(2) The prior art only adopts a combustion device to generate heat energy and electric energy. The invention adopts two energy conversion devices, namely a heat storage oxidation device and a gas generator set, and can adjust the heat loads of the two devices according to the change of the environmental temperature, thereby realizing the minimum consumption of low-concentration gas.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method of utilizing low-concentration gas, comprising:
providing gas with methane concentration lower than 30 mol% by using a gas pump room;
supplying a part of the gas supplied by the gas pump room to a mixer by using a low-concentration gas delivery guarantee unit to be mixed with air so as to obtain mixed gas with the methane concentration not higher than 1.2 mol%;
supplying the mixed gas to a gas heat storage oxidation device for oxidation treatment so as to obtain high-temperature flue gas and oxidized tail gas;
supplying a part of the high-temperature flue gas to a refrigeration unit to prepare low-temperature water and refrigeration tail gas;
supplying another part of the high-temperature flue gas to a heating unit to exchange heat with cold water so as to obtain high-temperature steam and heat exchange tail gas;
and supplying a part of the gas supplied by the gas pump room to a gas generator set by using a low-concentration gas conveying and guaranteeing unit to generate power by combustion, and generating combustion smoke.
2. The method of claim 1, wherein the refrigeration unit is a lithium bromide refrigeration unit.
3. A method according to claim 1 or 2, characterized in that the heating unit is a steam boiler.
4. The method of claim 1, further comprising: supplying the other part of the high-temperature flue gas to a fresh air heat exchanger to exchange heat with air so as to obtain hot air;
and the hot air is subjected to heat exchange with cold air provided by a fresh air fan and is mixed with the cold air, and then the mixed air is supplied to a shaft.
5. The method according to claim 4, characterized in that a portion of the combustion fumes is fed to the refrigeration unit and/or the heating unit for utilization.
6. The method of claim 5, further comprising: and supplying a part of the combustion flue gas to a hot water heat exchanger to exchange heat with cold water to generate hot water.
7. The method according to claim 6, wherein a first regulating valve is arranged between the low-concentration gas transmission and guarantee unit and the mixer, and a second regulating valve is arranged between the low-concentration gas transmission and guarantee unit and the gas generator set.
8. The method of claim 7, further comprising: and adjusting the opening degrees of the first adjusting valve and the second adjusting valve according to the display of the methane sensor by using an intelligent mixing unit respectively connected with the first adjusting valve, the second adjusting valve and the methane sensor at the front end of the gas pump room.
9. The method as claimed in claim 8, wherein a third regulating valve is provided between the refrigeration unit and the thermal gas storage and oxidation device, a fourth regulating valve is provided between the fresh air heat exchanger and the thermal gas storage and oxidation device, a fifth regulating valve is provided between the heating unit and the thermal gas storage and oxidation device, a sixth regulating valve is provided between the gas generator set and the heating unit, a seventh regulating valve is provided between the gas generator set and the fresh air heat exchanger, and an eighth regulating valve is provided between the hot water heat exchanger and the gas generator set.
10. The method of claim 9, further comprising: the intelligent control allocation unit connected with the power distribution equipment at the rear end of the methane sensor and the gas generator set is used for adjusting the opening degrees of the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve, the fifth regulating valve, the sixth regulating valve, the seventh regulating valve and the eighth regulating valve according to the display of the methane sensor and the power load of the power distribution equipment.
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