CN115011388A - Ventilation gas concentration and enrichment method - Google Patents
Ventilation gas concentration and enrichment method Download PDFInfo
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- CN115011388A CN115011388A CN202210581963.XA CN202210581963A CN115011388A CN 115011388 A CN115011388 A CN 115011388A CN 202210581963 A CN202210581963 A CN 202210581963A CN 115011388 A CN115011388 A CN 115011388A
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- 238000009423 ventilation Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000945 filler Substances 0.000 claims abstract description 109
- 238000001179 sorption measurement Methods 0.000 claims abstract description 97
- 238000003795 desorption Methods 0.000 claims abstract description 69
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000012856 packing Methods 0.000 claims description 45
- 238000007599 discharging Methods 0.000 claims description 39
- 229920006395 saturated elastomer Polymers 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 7
- 230000008676 import Effects 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 239000003463 adsorbent Substances 0.000 claims description 3
- 239000012621 metal-organic framework Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 212
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 26
- 238000005516 engineering process Methods 0.000 description 10
- 238000000746 purification Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
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Abstract
The invention provides a ventilation gas concentration enrichment method, belonging to the technical field of coal mine gas treatment and utilization.A working cycle is divided into n stages with equal time length, for any stage of the working cycle, an inlet of a filler area is always filled with desorption gas for desorption, an outlet of the filler area discharges concentrated gas, an inlet of the filler area is filled with normal temperature air for cooling, an outlet of the filler area discharges clean tail gas, an inlet of the residual filler area is filled with ventilation gas for adsorption, and an outlet of the residual filler area discharges clean tail gas. The invention can utilize the oxidation heat of the product gas as concentration enrichment energy, and has the advantages of low energy consumption, good economy, high reliability and long service life of the adsorption material.
Description
Technical Field
The invention belongs to the technical field of coal mine gas treatment and utilization, and particularly discloses a ventilation gas concentration and enrichment method.
Background
The ventilation gas is also called air exhaust gas and ventilation air methane, and refers to the gas exhausted along with the ventilation air flow under the coal mine. According to coal mine safety regulations, the concentration of methane in ventilation gas must be less than 0.75%; in order to ensure safety in actual work, the concentration of methane in the ventilation gas is generally controlled to be 0.2-0.3% or even lower. Meanwhile, the discharge amount of ventilation gas is huge, the annual emission amount in China is more than 300 billion cubic meters of pure methane, and the ventilation gas is completely emptied to form a huge greenhouse gas discharge source.
At present, ventilation gas is treated by utilizing a thermal countercurrent oxidation technology, but the technology has a bottleneck problem that the economic operation of equipment can be realized only when the concentration of the ventilation gas is maintained at about 1 percent, so that higher heat energy utilization efficiency is realized. Especially, when the concentration of the ventilation gas cannot be increased by mixing and extracting the gas in a coal enterprise, the concentration of the ventilation gas is increased to 1% by using a concentration and purification technology.
The existing gas concentration and purification technology mainly comprises a low-temperature rectification separation technology, a membrane separation technology, a pressure swing adsorption technology and the like, the product gas methane concentration of the technologies is high, but the technology process is complex, the cost is high, and the adaptability to the purification of extremely low-concentration gas is poor. Therefore, there is a need for a gas purification technology suitable for low-concentration gas (ventilation gas with methane concentration of 0.3% or less), which has a simple process and a low cost.
Disclosure of Invention
The invention provides a ventilation gas concentration enrichment method, which is suitable for ventilation gas with the methane concentration of 0.3% or below, can utilize the oxidation heat of product gas as concentration enrichment energy, and has the advantages of low energy consumption, good economy, high reliability and long service life of an adsorption material.
The invention relates to a ventilation gas concentration enrichment method, which adopts a ventilation gas concentration enrichment system to periodically work in a circulating way, wherein the ventilation gas concentration enrichment system comprises an inlet reversing valve, an adsorption section and an outlet reversing valve; an inlet I of the inlet reversing valve is communicated with wind gas, an inlet II of the inlet reversing valve is connected with desorption gas, and an inlet III of the inlet reversing valve is connected with normal-temperature air; the adsorption section is provided with n packing areas, n is an integer greater than or equal to 4, inlets of the n packing areas are respectively connected with n outlets of the inlet reversing valve, outlets of the n packing areas are respectively connected with n inlets of the outlet reversing valve, and each packing area is filled with an adsorption material; an outlet I of the outlet reversing valve discharges clean tail gas, and an outlet II discharges concentrated gas;
a duty cycle divide into n phases that length equals, to an arbitrary phase of a duty cycle, have the import in a filler district all the time to let in desorption gas and carry out desorption, export discharge concentrated gas, the import in a filler district lets in normal atmospheric temperature air and cools off, export discharge clean tail gas, the import in the remaining filler district lets in ventilation gas and adsorbs, export discharge clean tail gas.
Further, n stages of a working cycle switch the operating state in sequence according to the following process:
in the first stage, ventilating gas is introduced from the first filling area to the inlet of the n-2 filling area for adsorption, and clean tail gas is discharged from the outlet; desorption gas is introduced into an inlet of the filler region n-1 for desorption, and concentrated gas is discharged from an outlet; normal temperature air is introduced into an inlet of the filler region n for cooling, and clean tail gas is discharged from an outlet;
entering the second stage, continuously introducing ventilation gas from the first filling area to the inlet of the n-3 filling area for adsorption, and discharging clean tail gas from the outlet; the filler region n-2 with saturated adsorption is changed into a filler region with an inlet for introducing desorption gas for desorption, and an outlet for discharging concentrated gas; the desorbed filler region n-1 is changed into a filler region with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; the cooled filler region n is changed into a region where ventilation gas is introduced for adsorption, and clean tail gas is discharged from an outlet;
entering a third stage, continuously introducing ventilation gas from the first filling region to the filling region n-4 and the inlet of the filling region n for adsorption, and discharging clean tail gas from the outlet; the filler region n-3 with saturated adsorption is changed into a filler region with an inlet for introducing desorption gas for desorption, and an outlet for discharging concentrated gas; the desorbed filler region n-2 is changed into a filler region with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; introducing ventilation gas for adsorption instead of the cooled filler region n-1, and discharging clean tail gas at an outlet;
entering the n-2 stage, continuously introducing ventilation gas into inlets of the first packing region, the n packing region and the fifth packing region for adsorption, and discharging clean tail gas from an outlet; the second filler area with saturated adsorption is changed into a second filler area with an inlet for introducing desorption gas for desorption and an outlet for discharging concentrated gas; the third filling area after desorption is changed into a filling area with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; the cooled filler area IV is changed into a filler area I for adsorption by ventilating gas, and clean tail gas is discharged from an outlet;
entering the stage n-1, continuously introducing ventilation gas from the inlet of the filler region n to the inlet of the filler region IV for adsorption, and discharging clean tail gas from the outlet; the saturated adsorption packing area is changed into a mode that desorption gas is introduced into an inlet for desorption, and concentrated gas is discharged from an outlet; the desorbed filler zone II is changed into a filler zone II with an inlet filled with normal-temperature air for cooling and an outlet for discharging clean tail gas; the cooled filler III is absorbed by introducing ventilation gas, and clean tail gas is discharged from an outlet;
entering the nth stage, continuously introducing ventilation gas from the inlet of the filler region n-1 to the inlet of the filler region III for adsorption, and discharging clean tail gas from the outlet; the saturated adsorption packing region n is changed into a structure that desorption gas is introduced into an inlet for desorption, and concentrated gas is discharged from an outlet; the desorbed filler area is changed into a filler area with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; the cooled filler area II is changed into a filler area II which is absorbed by ventilating gas, and clean tail gas is discharged from an outlet; and completing one working cycle, entering the first stage of the next working cycle, and repeating the operation in cycles.
Further, the desorption gas accounts for 15 to 25 percent of the total amount of the ventilation gas, and the temperature is between 180 and 220 ℃; the normal temperature clean air accounts for 15-25% of the total amount of the ventilation gas.
Further, the desorbed gas is drawn out by ventilation gas and heated.
Furthermore, the ventilation gas concentration enrichment system also comprises a ventilation gas pipeline, a gas induced draft fan, a heat exchanger, a desorption gas pipeline, a normal temperature air pipeline, a tail gas pipeline and a concentrated gas pipeline; the ventilation gas pipeline is divided into two paths, the first path is connected with an inlet I of the inlet reversing valve, the second path is connected with an inlet of a gas induced draft fan, an outlet of the gas induced draft fan is connected with an inlet of a heat exchanger, and an outlet of the heat exchanger is connected with an inlet II of the inlet reversing valve through a desorption gas pipeline; the normal temperature air pipeline is connected with an inlet III of the inlet reversing valve; the tail gas pipeline is connected with an outlet I of the outlet reversing valve; and the outlet II of the concentrated gas pipeline and the outlet reversing valve.
Further, a tail gas draught fan and a tail gas discharge mechanism are sequentially installed on the tail gas pipeline.
Further, the inlet directional control valve controls the switching path by the inlet controller, and the outlet directional control valve controls the switching path by the outlet controller.
Further, the adsorption section comprises an adsorption section shell and a partition plate; the division board sets up in the absorption section casing, separates the inner space of absorption section casing for n identical packing district.
Furthermore, the adsorption section shell comprises a cylindrical section and circular truncated cone sections arranged at two ends of the cylindrical section, and the large end faces of the circular truncated cone sections are connected with the cylindrical section; the axial central line of the adsorption section shell is provided with a skeleton support, a plurality of partition plates are arranged between the adsorption section shell and the skeleton support, the adsorption section shell is divided into a plurality of identical fan-shaped spaces, and the fan-shaped spaces in the cylindrical section are filler areas.
Furthermore, the modified metal organic framework adsorption material is filled in the filling area.
Compared with the prior art, the invention has the following beneficial effects.
(1) High reliability and long service life of the adsorbing material: the switching of the working states of different packing areas of the adsorption section is realized by an inlet reversing valve and an outlet reversing valve; the adsorption material is loaded in the adsorption section and is still, so that bumping, collision and damage of the adsorption material are avoided, and the service life of the adsorption material is obviously prolonged; meanwhile, a driving mechanism of an adsorbing material is not needed, mechanical equipment is simple, and the system reliability is high.
(2) The energy consumption is less, and the economy is good: the conventional concentration method usually needs pressurization and consumes a large amount of electric power, the temperature swing adsorption method is adopted in the invention, the used heat can be provided by oxidizing the product gas concentrated gas, only a small amount of electric energy needs to be consumed in the concentration enrichment process, and the technical economy is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a process flow diagram of a ventilation gas enrichment system;
FIG. 2 is an axial cross-sectional view of the adsorption section;
fig. 3 is a radial cross-sectional view of the adsorption section.
In the figure: 1-ventilation gas pipeline, 2-inlet reversing valve, 3-inlet controller, 4-adsorption section, 4.1-adsorption section shell, 4.2-division plate, 4.3-framework support, 4.4-filler zone I, 4.5-filler zone II, 4.6-filler zone III, 4.7-filler zone IV, 4.8-filler zone V, 4.9-filler zone VI, 5-outlet reversing valve, 6-outlet controller, 7-tail gas induced draft fan, 8-chimney, 9-gas induced draft fan, 10-heat exchanger, 11-desorption gas pipeline, 12-concentrated gas pipeline and 13-normal temperature air pipeline.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The embodiment provides a ventilation gas concentration enrichment system, which comprises an inlet reversing valve 2, an adsorption section 4 and an outlet reversing valve 5; an inlet I of the inlet reversing valve 2 is communicated with air gas, an inlet II is connected with desorption gas, and an inlet III is connected with normal-temperature air; the adsorption section 4 is provided with n packing areas, n is an integer greater than or equal to 4, inlets of the n packing areas are respectively connected with n outlets of the inlet reversing valve 2, outlets of the n packing areas are respectively connected with n inlets of the outlet reversing valve 5, and each packing area is filled with an adsorption material; clean tail gas is discharged from an outlet I of the outlet reversing valve 5, and concentrated gas is discharged from an outlet II.
Further, the ventilation gas concentration and enrichment system further comprises a ventilation gas pipeline 1, a gas induced draft fan 9, a heat exchanger 10, a desorption gas pipeline 11, a normal temperature air pipeline 13, a tail gas pipeline and a concentrated gas pipeline 12; the ventilation gas pipeline 1 is divided into two paths, one path provides ventilation gas, the other path serves as desorption gas after being heated, specifically, the first path is connected with an inlet I of the inlet reversing valve 2, the second path is connected with an inlet of a gas induced draft fan 9, an outlet of the gas induced draft fan 9 is connected with an inlet of a heat exchanger 10, and an outlet of the heat exchanger 10 is connected with an inlet II of the inlet reversing valve 2 through a desorption gas pipeline 11; the normal temperature air pipeline 13 is connected with an inlet III of the inlet reversing valve 2; the tail gas pipeline is connected with an outlet I of the outlet reversing valve 5; the concentrated gas pipeline 12 and an outlet II of the outlet reversing valve 5, and the concentrated gas discharged from the concentrated gas pipeline 12 enters a subsequent oxidation treatment process.
Further, install tail gas draught fan 7 and tail gas emission mechanism on the tail gas pipeline in proper order, tail gas emission mechanism adopts chimney 8 in this embodiment.
Further, the inlet selector valve 2 is controlled by the inlet controller 3 to switch the passage, and the outlet selector valve 5 is controlled by the outlet controller 6 to switch the passage.
Further, the adsorption section 4 comprises an adsorption section shell 4.1 and a partition plate 4.2; the partition plate 4.2 is arranged in the adsorption section shell 4.1, the internal space of the adsorption section shell 4.1 is divided into n identical filler areas, and the filler areas are filled with modified metal organic framework adsorption materials. The shape of the inner space of the suction section housing 4.1 includes, but is not limited to, square, circular, etc.
Example 2
The embodiment provides a ventilation gas concentration and enrichment system, which is different from the ventilation gas concentration and enrichment system in embodiment 1 in that an adsorption section shell 4.1 adopts a special-shaped cylinder structure and comprises a cylinder section and circular truncated cone sections arranged at two ends of the cylinder section, and the large end surfaces of the circular truncated cone sections are connected with the cylinder section; be provided with skeleton brace 4.3 on the axial central line of absorption section casing 4.1, polylith division board 4.2 is installed and is adsorbed between section casing 4.1 and skeleton brace 4.3, will adsorb section casing 4.1 and separate into a plurality of identical fan-shaped spaces, and the fan-shaped space in the cylinder section is the filler district.
Example 3
The embodiment provides a ventilation gas enrichment method, which adopts the periodic cycle work of the ventilation gas enrichment system in the embodiment 1 or the embodiment 2, and one working period is divided into n stages with equal time length; and in any stage of a working cycle, introducing desorption gas into an inlet of one filler area for desorption and discharging concentrated gas from an outlet, introducing normal-temperature air into an inlet of one filler area for cooling and discharging clean tail gas from an outlet, and introducing ventilation gas into an inlet of the residual filler area for adsorption and discharging clean tail gas from an outlet.
The n stages of a working cycle switch the operation state in turn according to the following process:
in the first stage, ventilating gas is introduced from the first filling area to the inlet of the n-2 filling area for adsorption, and clean tail gas is discharged from the outlet; desorption gas is introduced into an inlet of the filler region n-1 for desorption, and concentrated gas is discharged from an outlet; normal temperature air is introduced into an inlet of the filler region n for cooling, and clean tail gas is discharged from an outlet;
in the second stage, ventilating gas is continuously introduced from the first filling area to the inlet of the n-3 filling area for adsorption, and clean tail gas is discharged from the outlet; the saturated adsorption packing region n-2 is changed into a structure that desorption gas is introduced into an inlet for desorption, and concentrated gas is discharged from an outlet; the desorbed filler region n-1 is changed into a filler region with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; the cooled filler region n is changed into a region where ventilation gas is introduced for adsorption, and clean tail gas is discharged from an outlet;
entering a third stage, continuously introducing ventilation gas from the first filling region to the filling region n-4 and the inlet of the filling region n for adsorption, and discharging clean tail gas from the outlet; the filler region n-3 with saturated adsorption is changed into a filler region with an inlet for introducing desorption gas for desorption, and an outlet for discharging concentrated gas; the desorbed packing region n-2 is changed into a structure that normal temperature air is introduced into an inlet for cooling, and clean tail gas is discharged from an outlet; introducing ventilation gas for adsorption instead of the cooled filler region n-1, and discharging clean tail gas at an outlet;
entering the n-2 stage, continuously introducing ventilation gas into inlets of the first filler region, the n filler region and the fifth filler region for adsorption, and discharging clean tail gas from an outlet; the second filler area with saturated adsorption is changed into a second filler area with an inlet for introducing desorption gas for desorption and an outlet for discharging concentrated gas; the third filling area after desorption is changed into a filling area with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; the cooled filler area IV is changed into a filler area I for adsorption by ventilating gas, and clean tail gas is discharged from an outlet;
entering the (n-1) stage, continuously introducing ventilation gas into inlets from the filler region n to the filler region IV for adsorption, and discharging clean tail gas from an outlet; the saturated adsorption packing area is changed into a mode that desorption gas is introduced into an inlet for desorption, and concentrated gas is discharged from an outlet; the second packing area after desorption is changed into a second packing area, the inlet of the second packing area is filled with normal temperature air for cooling, and the outlet of the second packing area discharges clean tail gas; the cooled filler III is absorbed by introducing ventilation gas, and clean tail gas is discharged from an outlet;
entering the nth stage, continuously introducing ventilation gas from the inlet of the filler region n-1 to the inlet of the filler region III for adsorption, and discharging clean tail gas from the outlet; the saturated adsorption packing region n is changed into a structure that desorption gas is introduced into an inlet for desorption, and concentrated gas is discharged from an outlet; the desorbed filler area is changed into a filler area with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; the cooled filler area II is changed into a filler area II which is absorbed by ventilating gas, and clean tail gas is discharged from an outlet; and completing one working cycle, entering the first stage of the next working cycle, and repeating the operation in cycles.
The inlet gas of each packing area is switched by an inlet change valve 2, and the outlet gas is switched by an outlet change valve 5.
The specific flow process of the gas is as follows:
ventilating gas enters an inlet reversing valve 2 from a ventilating gas pipeline 1; the inlet reversing valve 2 controls the ventilation gas to enter a part of the packing area of the adsorption section 4, and the methane is adsorbed in the corresponding packing area of the adsorption section 4; the clean tail gas after methane is adsorbed is controlled by an outlet reversing valve 5 and is discharged into the atmosphere through a tail gas induced draft fan 7 and a chimney 8;
the gas draught fan 9 extracts 15% -25% of the total amount of the ventilation gas, the gas is heated to 180 ℃ -220 ℃ through a heat exchanger 10, and the gas enters the inlet reversing valve 2 through a desorption gas pipeline 11; the inlet reversing valve 2 controls the desorbed gas to enter a filler area which is saturated in the adsorption section 4, the methane adsorbed in the corresponding filler area of the adsorption section 4 is desorbed to form concentrated gas due to the temperature rise, the concentrated gas is controlled by the outlet reversing valve 5 and is discharged through a concentrated gas pipeline 12 to enter a subsequent oxidation treatment process;
a proper amount of normal-temperature clean air (15-25% of the total amount of ventilation gas) enters the inlet reversing valve 2 through a normal-temperature air pipeline 13; the inlet reversing valve 2 controls normal temperature air to enter the filler zone which is desorbed completely in the adsorption section 4, reduces the temperature of the filler zone to normal temperature, is controlled by the outlet reversing valve 5, and is discharged into the atmosphere through the tail gas induced draft fan 7 and the chimney 8.
The working state of each packing area at different stages is described by taking the number of the packing areas as 6.
For any filler zone, firstly introducing ventilation gas, adsorbing methane in the ventilation gas on an adsorbing material, and greatly reducing the methane in the ventilation gas to form clean tail gas to be discharged; the desorption gas is introduced into the reaction kettle instead of the inlet reversing valve 2, the adsorbent is heated, the methane is desorbed, and the concentrated gas is discharged; the control of the inlet reversing valve 2 is changed into a stage of introducing normal temperature air, the adsorbent is cooled, and the air is discharged as clean tail gas; the control of the inlet reversing valve 2 is changed into the introduction of ventilation gas, and the circulation operation is carried out.
One working cycle is divided into 6 phases of equal duration. For any stage, ventilating gas is introduced into four filler areas for adsorption, desorption gas is introduced into one filler area for desorption, and normal-temperature air is introduced into one filler area for cooling; in the next stage, the three packing areas are continuously introduced with ventilation gas for adsorption, one packing area with saturated adsorption is introduced with desorption gas for desorption, the packing area with the desorbed gas is introduced with normal-temperature air for cooling, and the packing area with the cooled gas is introduced with ventilation gas for adsorption; and entering the next stage, and switching the operation state in sequence by the analogy, and circularly operating in such a way.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A ventilation gas concentration enrichment method is characterized in that a ventilation gas concentration enrichment system is adopted to periodically work in a circulating manner, and the ventilation gas concentration enrichment system comprises an inlet reversing valve, an adsorption section and an outlet reversing valve;
an inlet I of the inlet reversing valve is communicated with wind gas, an inlet II of the inlet reversing valve is connected with desorption gas, and an inlet III of the inlet reversing valve is connected with normal-temperature air;
the adsorption section is provided with n packing areas, n is an integer greater than or equal to 4, inlets of the n packing areas are respectively connected with n outlets of the inlet reversing valve, outlets of the n packing areas are respectively connected with n inlets of the outlet reversing valve, and each packing area is filled with an adsorption material;
an outlet I of the outlet reversing valve discharges clean tail gas, and an outlet II discharges concentrated gas;
a duty cycle divide into n phases that length equals, to an arbitrary phase of a duty cycle, have the import in a filler district all the time to let in desorption gas and carry out desorption, export discharge concentrated gas, the import in a filler district lets in normal atmospheric temperature air and cools off, export discharge clean tail gas, the import in the remaining filler district lets in ventilation gas and adsorbs, export discharge clean tail gas.
2. The ventilation gas concentration enrichment method according to claim 1, wherein the n stages of one duty cycle sequentially switch the operation state according to the following process:
in the first stage, ventilating gas is introduced from the first filling area to the inlet of the n-2 filling area for adsorption, and clean tail gas is discharged from the outlet; desorption gas is introduced into an inlet of the filler region n-1 for desorption, and concentrated gas is discharged from an outlet; normal temperature air is introduced into an inlet of the filler region n for cooling, and clean tail gas is discharged from an outlet;
in the second stage, ventilating gas is continuously introduced from the first filling area to the inlet of the n-3 filling area for adsorption, and clean tail gas is discharged from the outlet; the saturated adsorption packing region n-2 is changed into a structure that desorption gas is introduced into an inlet for desorption, and concentrated gas is discharged from an outlet; the desorbed filler region n-1 is changed into a filler region with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; the cooled filler region n is changed into a region where ventilation gas is introduced for adsorption, and clean tail gas is discharged from an outlet;
entering a third stage, continuously introducing ventilation gas from the first filling region to the filling region n-4 and the inlet of the filling region n for adsorption, and discharging clean tail gas from the outlet; the filler region n-3 with saturated adsorption is changed into a filler region with an inlet for introducing desorption gas for desorption, and an outlet for discharging concentrated gas; the desorbed filler region n-2 is changed into a filler region with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; introducing ventilation gas for adsorption instead of the cooled filler region n-1, and discharging clean tail gas at an outlet;
entering the n-2 stage, continuously introducing ventilation gas into inlets of the first filler region, the n filler region and the fifth filler region for adsorption, and discharging clean tail gas from an outlet; the second filler area with saturated adsorption is changed into a second filler area with an inlet for introducing desorption gas for desorption and an outlet for discharging concentrated gas; the third filling area after desorption is changed into a filling area with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; the cooled filler region IV is changed into a filling region for absorption by ventilating gas, and clean tail gas is discharged from an outlet;
entering the stage n-1, continuously introducing ventilation gas from the inlet of the filler region n to the inlet of the filler region IV for adsorption, and discharging clean tail gas from the outlet; the saturated adsorption packing area is changed into a mode that desorption gas is introduced into an inlet for desorption, and concentrated gas is discharged from an outlet; the second packing area after desorption is changed into a second packing area, the inlet of the second packing area is filled with normal temperature air for cooling, and the outlet of the second packing area discharges clean tail gas; filling the cooled filler III into ventilation gas for adsorption, and discharging clean tail gas from an outlet;
entering the nth stage, continuously introducing ventilation gas from the inlet of the filler region n-1 to the inlet of the filler region III for adsorption, and discharging clean tail gas from the outlet; the saturated adsorption packing region n is changed into a structure that desorption gas is introduced into an inlet for desorption, and concentrated gas is discharged from an outlet; the desorbed filler area is changed into a filler area with an inlet filled with normal temperature air for cooling and an outlet for discharging clean tail gas; the cooled packing area II is changed into a filling area I, ventilating gas is introduced for adsorption, and clean tail gas is discharged from an outlet; and completing one working cycle, entering the first stage of the next working cycle, and repeating the operation in cycles.
3. The ventilation gas concentration and enrichment method according to claim 1 or 2, characterized in that the desorption gas accounts for 15 to 25 percent of the total amount of the ventilation gas, and the temperature is between 180 and 220 ℃; the normal temperature clean air accounts for 15-25% of the total amount of the ventilation gas.
4. The ventilation gas enrichment method according to claim 3, wherein the desorption gas is drawn from the ventilation gas and heated.
5. The method according to claim 4, wherein the ventilation gas concentration and enrichment system further comprises a ventilation gas pipeline, a gas induced draft fan, a heat exchanger, a desorption gas pipeline, a normal temperature air pipeline, a tail gas pipeline and a concentrated gas pipeline;
the ventilation gas pipeline is divided into two paths, the first path is connected with an inlet I of the inlet reversing valve, the second path is connected with an inlet of a gas induced draft fan, an outlet of the gas induced draft fan is connected with an inlet of the heat exchanger, and an outlet of the heat exchanger is connected with an inlet II of the inlet reversing valve through a desorption gas pipeline;
the normal temperature air pipeline is connected with an inlet III of the inlet reversing valve;
the tail gas pipeline is connected with an outlet I of the outlet reversing valve;
and the concentrated gas pipeline and an outlet II of the outlet reversing valve.
6. The method for concentrating and enriching ventilation gas according to claim 5, wherein a tail gas draught fan and a tail gas discharge mechanism are sequentially installed on the tail gas pipeline.
7. The ventilation gas enrichment method according to claim 6, wherein the inlet selector valve controls the switching path by an inlet controller, and the outlet selector valve controls the switching path by an outlet controller.
8. The ventilation gas concentration enrichment method according to claim 1 or 2, wherein the adsorption section comprises an adsorption section housing and a partition plate;
the partition plate is arranged in the adsorption section shell and divides the inner space of the adsorption section shell into n identical packing areas.
9. The method for concentrating and enriching ventilation gas according to claim 8, wherein the adsorption section shell comprises a cylindrical section and circular truncated cone sections arranged at two ends of the cylindrical section, and the large end faces of the circular truncated cone sections are connected with the cylindrical section;
the axial central line of the adsorption section shell is provided with a skeleton support, a plurality of partition plates are arranged between the adsorption section shell and the skeleton support, the adsorption section shell is divided into a plurality of identical fan-shaped spaces, and the fan-shaped spaces in the cylindrical section are filler areas.
10. The ventilation gas concentration enrichment method of claim 9, wherein the filler zone is filled with a modified metal organic framework adsorbent material.
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| JPH01310732A (en) * | 1988-06-10 | 1989-12-14 | Hitachi Ltd | Reaction column for solid gel |
| CN103301711A (en) * | 2013-07-03 | 2013-09-18 | 中煤科工集团重庆研究院 | Multi-tower type ventilation air methane temperature swing adsorption concentration device |
| CN105944500A (en) * | 2016-06-24 | 2016-09-21 | 浙江恒荣环保科技有限公司 | Fixed bed type honeycomb VOCs adsorption and desorption device and method |
| CN108126472A (en) * | 2017-12-29 | 2018-06-08 | 嘉园环保有限公司 | A kind of technique for organic exhaust gas adsorption concentration |
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2022
- 2022-05-26 CN CN202210581963.XA patent/CN115011388A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01310732A (en) * | 1988-06-10 | 1989-12-14 | Hitachi Ltd | Reaction column for solid gel |
| CN103301711A (en) * | 2013-07-03 | 2013-09-18 | 中煤科工集团重庆研究院 | Multi-tower type ventilation air methane temperature swing adsorption concentration device |
| CN105944500A (en) * | 2016-06-24 | 2016-09-21 | 浙江恒荣环保科技有限公司 | Fixed bed type honeycomb VOCs adsorption and desorption device and method |
| CN108126472A (en) * | 2017-12-29 | 2018-06-08 | 嘉园环保有限公司 | A kind of technique for organic exhaust gas adsorption concentration |
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Application publication date: 20220906 |