Gas concentration-oxidation-regenerative regeneration system and method

Abstract

The invention discloses a gas concentration-oxidation-heat regeneration system and method, and relates to the technical field of coal mine energy conservation and emission reduction, the gas concentration-oxidation-heat regeneration system comprises a chemical adsorption device which is communicated with low-concentration gas and is used for adsorbing and dedusting the low-concentration gas, and a physical adsorption device which is communicated with the chemical adsorption device and is used for adsorbing and dehumidifying the low-concentration gas, the chemical adsorption device and the physical adsorption device are communicated with the oxidation device through the chemical desorption device and the physical desorption device respectively, the oxidation device is communicated with the waste heat utilization device, and low-concentration gas is subjected to dust removal treatment while methane adsorption is completed through the chemical adsorption device; the physical adsorption device is used for completing methane adsorption and dehumidifying low-concentration gas at the same time, and desorbing is completed and concentrated methane after desorption is subjected to oxidation and waste heat utilization at the same time, so that dust removal, dehumidification, concentration, oxidation and waste heat utilization of the device form a whole, the structure of the device is simplified, and the low-concentration gas is fully utilized.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine energy conservation and emission reduction, and in particular to a gas concentration-oxidation-heat recovery regeneration system and method. Background Art

[0002] To address mine safety concerns, gas extraction is typically used to reduce exhaust gas to a safe concentration of less than 1%. However, in my country's coal mine gas extraction process, due to the single-use extraction method, high levels of air intrusion, and fluctuating extraction volumes, the majority of extracted gas is low-concentration gas, with concentrations below 30%. Of this, gas with concentrations below 8% accounts for over 70% of the total extraction volume. Because this gas is within the explosive concentration range, conventional combustion methods are difficult to stably and efficiently utilize, and it is ultimately discharged into the atmosphere.

[0003] The existing method for treating low-concentration gas only adsorbs the low-concentration gas during the adsorption process of the low-concentration gas, and cannot achieve the oxidation and waste heat utilization of the low-concentration gas, and cannot achieve dust removal of the low-concentration gas. In the process of dehumidifying the low-concentration gas in the existing technology, the device structure is complex and the cost is high.

[0004] Therefore, it is necessary to develop and design a gas concentration-oxidation-heat regeneration system and method. In the process of adsorption and desorption of low-concentration gas, dust removal and dehumidification of low-concentration gas can be achieved, and the concentrated gas can be directly oxidized and waste heat can be utilized. Making the device structure simple and making full use of low-concentration gas are technical problems that technical personnel in this field urgently need to solve. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a gas concentration-oxidation-heat regeneration system and method, which can achieve dust removal and dehumidification of low-concentration gas during the adsorption and desorption process of low-concentration gas, and can directly oxidize the concentrated gas and utilize the waste heat, making the device structure simple and achieving full utilization of low-concentration gas.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A gas concentration-oxidation-heat regeneration system includes a chemical adsorption device connected to low-concentration gas and capable of adsorbing and removing dust from the low-concentration gas, and a physical adsorption device connected to the chemical adsorption device for adsorbing and dehumidifying the low-concentration gas. The chemical adsorption device and the physical adsorption device are connected to an oxidation device via a chemical desorption device and a physical desorption device, respectively, and the oxidation device is connected to a waste heat utilization device.

[0008] Preferably, the gas inlets of the chemical adsorption device and the physical adsorption device are both provided with regulating doors for flow regulation and gas distribution.

[0009] Preferably, the chemical adsorption device includes a first box body and a chemical adsorption reagent disposed in the first box body, and an atomization device for atomizing the chemical adsorption reagent is disposed on the top of the first box body.

[0010] Preferably, the physical adsorption device includes a second box and a physical adsorption filler arranged inside the second box, and the physical adsorption filler is used to adsorb the chemical adsorption reagent and moisture in the low-concentration gas.

[0011] Preferably, the chemical desorption device includes a heat exchange medium chamber and a desorption chamber for circulating a chemical adsorption reagent to achieve desorption of the chemical adsorption reagent. The heat exchange medium chamber is arranged outside the desorption chamber. The desorption chamber is provided with a first methane gas outlet, and the first methane gas outlet is connected to the oxidation device.

[0012] Preferably, the physical desorption device includes a heat exchange chamber connected to the heat exchange gas, and the heat exchange chamber is provided with a heat exchange gas inlet and a heat exchange gas outlet connected to the physical adsorption device, a heat exchange medium inlet connected to the heat exchange medium, and a second methane gas outlet connected to the oxidation device.

[0013] Preferably, the second methane gas outlet is connected to the oxidation device through a cyclone separator.

[0014] Preferably, the waste heat utilization device is provided with a hot flue gas outlet, and the hot flue gas outlet is communicated with the heat exchange medium cavity and the heat exchange cavity respectively.

[0015] Preferably, the first methane gas outlet is connected to the oxidation device through a gas-liquid separation device.

[0016] The present invention also discloses a gas concentration-oxidation-heat recovery regeneration method, which uses the gas concentration-oxidation-heat recovery regeneration system described above, and includes the following steps:

[0017] High humidity, high dust and low concentration gas is removed through chemical adsorption device and methane gas is adsorbed;

[0018] The adsorbed chemical adsorption reagent flows into the chemical desorption device for desorption, and the desorbed concentrated methane gas is oxidized and burned;

[0019] The low-concentration gas that is not completely adsorbed and discharged from the chemical adsorption device is adsorbed by the physical adsorption device on the moisture and chemical adsorbent;

[0020] The adsorbed physical adsorption filler is desorbed by high-temperature heat exchange gas, and the desorbed concentrated methane gas is oxidized and burned;

[0021] The high-temperature gas after combustion is recycled.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] While completing methane adsorption through the chemical adsorption device, the low-concentration gas is subjected to dust removal. While completing methane adsorption through the physical adsorption device, the low-concentration gas is subjected to dehumidification. While completing desorption, the desorbed concentrated methane is oxidized and the waste heat is utilized. The dust removal, dehumidification, concentration, oxidation and waste heat utilization of the device are integrated into a whole, simplifying the device structure and realizing full utilization of low-concentration gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Attachment Figure 1 This is a schematic diagram of the overall structure of the gas concentration-oxidation-heat regeneration system disclosed in the present invention;

[0026] Among them, 1. Chemical adsorption device; 2. Chemical adsorption reagent; 3. Chemical adsorption device air inlet; 4. Physical adsorption device air inlet; 5. Physical adsorption filler; 6. Physical adsorption device; 7. Gas exhaust port; 8. Heat exchange gas inlet; 9. Heat exchange gas outlet; 10. Cyclone separator; 11. Second heat exchange medium inlet; 12. Second methane gas outlet; 13. Desorption liquid inlet; 14. Desorption liquid outlet; 15. First heat exchange medium inlet; 16. First heat exchange medium outlet; 17. Flue gas outlet; 18. Waste heat utilization device; 19. Waste heat recovery device; 20. Oxidation device. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide a gas concentration-oxidation-heat regeneration system and method, which can achieve dust removal and dehumidification of low-concentration gas during the adsorption and desorption process of low-concentration gas, and can directly oxidize the concentrated gas and utilize the waste heat, so that the device structure is simple and the low-concentration gas can be fully utilized.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] refer to Figure 1 The gas concentration-oxidation-regeneration system disclosed in the embodiment of the present invention comprises at least a chemical adsorption device 1, which is connected to the low-concentration gas and can achieve adsorption and dust removal of methane in the low-concentration gas. The end of the chemical adsorption device 1 away from the low-concentration gas inlet is connected to the physical adsorption device 6. The physical adsorption device 6 can further adsorb methane from the low-concentration gas that is not completely adsorbed in the chemical adsorption device 1, and adsorb the moisture and chemical adsorbent inside the low-concentration gas after adsorption by the chemical adsorption device 1 to achieve the dehumidification effect. The chemical adsorption device 1 The chemical desorption device is connected to the air inlet of the oxidation device 20, the physical adsorption device 6 is connected to the air inlet of the oxidation device 20 through the physical desorption device, and the oxidation device 20 is connected to the waste heat utilization device 18. In this embodiment, the chemical adsorption device 1 completes methane adsorption while performing dust removal on the low-concentration gas, and the physical adsorption device 6 completes methane adsorption while performing dehumidification on the low-concentration gas. When desorption is completed, the desorbed concentrated methane is oxidized and waste heat is utilized, so that the dust removal, dehumidification, concentration, oxidation and waste heat utilization of the device form a whole, simplifying the device structure and realizing full utilization of the low-concentration gas.

[0031] refer to Figure 1 In one embodiment, the air inlet 3 of the chemical adsorption device and the air inlet 4 of the physical adsorption device are both provided with regulating gates for flow regulation and gas distribution to achieve regulation of the low-concentration gas intake volume and ensure uniform gas distribution. The physical adsorption device 6 is also provided with a gas outlet 7 for discharging the adsorbed gas.

[0032] It should be noted that the regulating gate includes a flow control valve and a gas distributor connected to the flow control valve through a pipeline. The gas distributor is a plate-like structure with multiple gas through holes evenly arranged. The outer wall of the plate-like structure is connected to the inner wall of the pipeline to achieve uniform distribution of the gas.

[0033] refer to Figure 1As a preferred embodiment, the chemical adsorption device 1 includes a first box body and a chemical adsorption reagent 2 arranged in the first box body. An atomizing device for atomizing the chemical adsorption reagent 2 is arranged on the top of the first box body. By arranging the chemical adsorption reagent 2 in the chemical adsorption device 1, the liquid chemical adsorption reagent 2 can not only adsorb methane in the low-concentration gas, but also remove dust in the low-concentration gas. After the low-concentration gas is introduced from the bottom of the chemical adsorption device 1, it fully reacts with the chemical adsorption reagent 2. The low-concentration gas that has not completely reacted is precipitated from the liquid surface of the chemical adsorption reagent 2. The chemical adsorption reagent 2 is then sprayed on the low-concentration gas that has not completely reacted through the atomizing device arranged on the top, so that the low-concentration gas that has not completely reacted is fully in contact with and reacts with the chemical adsorption reagent 2, thereby improving the chemical adsorption effect.

[0034] It should be noted that the atomizing device is an atomizer or a shower head, as long as it can achieve atomization of the chemical adsorption reagent 2.

[0035] refer to Figure 1 In one embodiment, the physical adsorption device 6 includes a second box body, which is filled with a physical adsorption filler 5. The physical adsorption filler 5 is used to adsorb the chemical adsorption agent 2 and moisture in the low-concentration gas. The low-concentration gas that has been adsorbed by the chemical adsorption device 1 is fully reacted and enters the physical adsorption device 6. The physical adsorption filler 5 adsorbs the moisture, chemical adsorption agent 2 and methane in the low-concentration gas, thereby ensuring the methane adsorption effect while dehumidifying the low-concentration gas.

[0036] refer to Figure 1 As a preferred embodiment, the chemical desorption device includes a heat exchange medium cavity, which is provided with a first heat exchange medium inlet 15 and a first heat exchange medium outlet 16 to realize the circulation of the high-temperature heat exchange medium in the heat exchange medium cavity. The heat exchange medium cavity is provided with a desorption cavity, which is provided with a desorption liquid inlet 13 and a desorption liquid outlet 14. The desorption liquid inlet 13 and the desorption liquid outlet 14 are both connected to the chemical adsorption device 1 to realize the circulation of the chemical adsorption reagent 2. The desorption cavity is also provided with a desorption liquid inlet 13 and a desorption liquid outlet 14 to realize the circulation of the chemical adsorption reagent 2. The methane flows out of the first methane gas outlet, and the first methane gas outlet is connected to the oxidation device 20. When the chemical adsorption reagent 2 needs to be desorbed, the chemical adsorption reagent 2 enters the desorption chamber through the desorption liquid inlet 13. The desorption liquid in the desorption chamber precipitates the methane gas after heat exchange with the heat exchange medium chamber to achieve desorption. The desorbed chemical adsorption reagent 2 enters the chemical adsorption device 1 through the desorption liquid outlet 14, and the concentrated methane is passed into the oxidation device 20 through the first methane gas outlet for oxidation.

[0037] It should be noted that the heat exchange medium can be heat exchange oil or high-temperature heat exchange gas, the heat exchange can be achieved by the hot flue gas generated by oxidation in the device itself, or by a heat exchange device outside the entire device.

[0038] refer to Figure 1 As a preferred embodiment, the physical desorption device includes a heat exchange chamber connected to the heat exchange gas, and a heat exchange gas inlet 8 and a heat exchange gas outlet 9 are provided on the heat exchange chamber. The heat exchange gas inlet 8 and the heat exchange gas outlet 9 are both connected to the physical adsorption device 6. A second heat exchange medium inlet 11 is provided at the upper part of the heat exchange chamber, and a second methane gas outlet 12 is also provided on the heat exchange chamber. The second methane gas outlet 12 is connected to the oxidation device 20. When the physical adsorption filler 5 in the physical adsorption device 6 needs to be desorbed, the gaseous heat exchange medium enters the heat exchange chamber through the second heat exchange medium inlet 11 and enters the physical adsorption device 6 through the heat exchange gas outlet 9, and desorbs the physical adsorption filler 5 at high temperature. The desorbed methane enters the physical desorption device together with the gaseous heat exchange medium through the heat exchange gas inlet 8, and is connected to the oxidation device 20 through the second methane gas outlet 12 for oxidation.

[0039] It should be noted that the chemical adsorption agent 2 can be an organic amine or a modified substance thereof, and the physical adsorption filler 5 can be MOFs (metal organic frameworks), COFs (covalent organic frameworks), etc., which can have various pore sizes and various combinations.

[0040] refer to Figure 1 As an implementation method, the second methane gas outlet 12 is connected to the oxidation device 20 through the cyclone separator 10. By setting the cyclone separator 10, the concentrated methane gas and the physical adsorption filler 5 or solid matter contained in the gas heat exchange medium can be separated.

[0041] It should be noted that the cyclone separator 10 extends into the interior of the physical desorption device, and the height of the inlet of the cyclone separator 10 is smaller than the height of the second heat exchange medium inlet 11 .

[0042] refer to Figure 1 As an embodiment, the waste heat utilization device 18 is provided with a flue gas outlet 17. The high-temperature flue gas generated in the flue gas outlet 17 is respectively connected to the first heat exchange medium inlet 15 and the second heat exchange medium inlet 11. That is, the high-temperature flue gas generated by the oxidation device 20 can be directly used as a heat exchange medium to pass through the physical desorption device and the chemical desorption device after heat exchange through the waste heat utilization device 18. There is no need to set up an additional heat exchange medium. On the basis of ensuring the full utilization of the waste heat generated by methane oxidation, the device structure can also be simplified.

[0043] refer to Figure 1As an embodiment, the first methane gas outlet is connected to the oxidation device 20 through the gas-liquid separation device, which can further remove the moisture and chemical adsorption agent 2 mixed in the methane gas and improve the dehumidification effect.

[0044] The present invention also discloses a gas concentration-oxidation-heat recovery regeneration method, which uses the above-mentioned gas concentration-oxidation-heat recovery regeneration system, including the following steps:

[0045] High humidity, high dust and low concentration gas is removed from the gas by the chemical adsorption reagent 2 in the chemical adsorption device 1 and the methane gas is adsorbed;

[0046] The adsorbed chemical adsorption reagent 2 flows into the chemical desorption device and is heated by a high-temperature medium for desorption. The desorbed chemical adsorption reagent 2 enters the desorption chamber through the desorption liquid inlet 13. The desorption liquid in the desorption chamber precipitates the methane gas after heat exchange with the heat exchange medium chamber, thereby achieving desorption. The desorbed chemical adsorption reagent 2 enters the chemical adsorption device 1 through the desorption liquid outlet 14. The concentrated methane is passed into the oxidation device 20 through the first methane gas outlet for oxidation and combustion.

[0047] The low-concentration gas that is not completely adsorbed from the chemical adsorption device 1 passes through the physical adsorption device 6, and the physical adsorption filler 5 adsorbs the moisture and chemical adsorbent in the low-concentration gas;

[0048] The adsorbed physical adsorption filler 5 is desorbed by the heat exchange gas introduced into the physical adsorption device 6, and the desorbed concentrated methane gas enters the oxidation device 20 along with the high-temperature flue gas;

[0049] The methane gas concentrated by the physical adsorption device 6 and the chemical adsorption device 1 is passed into the oxidation device 20 for oxidation combustion;

[0050] The high-temperature gas after combustion is recovered and utilized through the waste heat utilization device 18.

[0051] The waste heat utilization device 18 includes a third box body, a high-temperature flue gas chamber arranged in the third box body and connected to the oxidation device 20, and a working medium circulation chamber arranged outside the high-temperature flue gas chamber. The high-temperature flue gas generated by the oxidation device 20 exchanges heat with the circulating working medium in the high-temperature flue gas chamber and the working medium circulation chamber, thereby realizing the repeated utilization of the high temperature in the high-temperature flue gas. Part of the high-temperature flue gas after heat exchange is connected to the first heat exchange medium inlet 15 and the second heat exchange medium inlet 11 through the flue gas outlet 17 arranged on the third box body, and the other part of the high-temperature flue gas after heat exchange is recovered through the waste heat recovery device 19 (for example, for heating, etc.), and then discharged through the purification device.

[0052] The oxidation device 20 includes a fourth box, an ignition system arranged inside the fourth box to realize the ignition operation in the fourth box, a flame monitoring system arranged inside the fourth box, the flame monitoring system is used to monitor the combustion process of methane in the fourth box, a temperature monitoring system, the temperature monitoring system is used to monitor the thermal oxidation process in the fourth box, a gas concentration monitoring system, which is used to monitor the gas concentration in the fourth box, and a control system. The control system is electrically connected to the regulating door, the ignition system, the flame monitoring system, the gas concentration monitoring system and the temperature monitoring system respectively, through the gas The concentration monitoring system monitors the gas concentration in the fourth box in real time to control the movement of the regulating door to adjust the flow of low-concentration gas. When the gas concentration monitoring system detects that the gas concentration inside the fourth box is too high, the door opening is adjusted to be smaller. When the gas concentration monitoring system detects that the gas concentration inside the fourth box is too low, the door opening is adjusted to be larger. The ignition system is activated according to the size of the flame inside the fourth box monitored by the flame monitoring system. When the flame in the fourth box is too large, the ignition system is controlled to be closed. When the flame in the fourth box is too small, the ignition system is controlled to be opened.

[0053] It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed therein. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

Claims

1. A gas concentration-oxidation-heat regeneration system, characterized in that: It includes a chemical adsorption device connected to low-concentration gas and capable of adsorbing and removing dust from the low-concentration gas, and a physical adsorption device connected to the chemical adsorption device to adsorb and dehumidify the low-concentration gas. The chemical adsorption device and the physical adsorption device are connected to an oxidation device via a chemical desorption device and a physical desorption device respectively, and the oxidation device is connected to a waste heat utilization device.

2. The gas concentration-oxidation-heat regeneration system according to claim 1, characterized in that: The air inlets of the chemical adsorption device and the physical adsorption device are both provided with regulating doors for flow regulation and gas distribution.

3. The gas concentration-oxidation-heat regeneration system according to claim 1, characterized in that: The chemical adsorption device includes a first box body and a chemical adsorption reagent arranged in the first box body. An atomization device for atomizing the chemical adsorption reagent is arranged on the top of the first box body.

4. The gas concentration-oxidation-heat regeneration system according to claim 3, characterized in that: The physical adsorption device includes a second box and a physical adsorption filler arranged inside the second box, and the physical adsorption filler is used to adsorb the chemical adsorption reagent and moisture in the low-concentration gas.

5. The gas concentration-oxidation-heat regeneration system according to claim 4, characterized in that: The chemical desorption device includes a heat exchange medium chamber and a desorption chamber for circulating a chemical adsorption reagent to achieve desorption of the chemical adsorption reagent. The heat exchange medium chamber is arranged outside the desorption chamber. The desorption chamber is provided with a first methane gas outlet, and the first methane gas outlet is connected to the oxidation device.

6. The gas concentration-oxidation-heat regeneration system according to claim 5, characterized in that: The physical desorption device includes a heat exchange chamber connected to the heat exchange gas, and the heat exchange chamber is provided with a heat exchange gas inlet and a heat exchange gas outlet connected to the physical adsorption device, a heat exchange medium inlet connected to the heat exchange medium, and a second methane gas outlet connected to the oxidation device.

7. The gas concentration-oxidation-heat regeneration system according to claim 6, characterized in that: The second methane gas outlet is connected to the oxidation device through a cyclone separator.

8. The gas concentration-oxidation-heat regeneration system according to claim 6, characterized in that: The waste heat utilization device is provided with a hot flue gas outlet, and the hot flue gas outlet is communicated with the heat exchange medium cavity and the heat exchange cavity respectively.

9. The gas concentration-oxidation-heat regeneration system according to claim 5, characterized in that: The first methane gas outlet is connected to the oxidation device through a gas-liquid separation device.

10. A gas concentration-oxidation-heat regeneration method, characterized in that: The application of the gas concentration-oxidation-heat regeneration system according to any one of claims 1 to 9 comprises the following steps: High humidity, high dust and low concentration gas is removed through chemical adsorption device and methane gas is adsorbed; The adsorbed chemical adsorption reagent flows into the chemical desorption device for desorption, and the desorbed concentrated methane gas is oxidized and burned; The low-concentration gas that is not completely adsorbed and discharged from the chemical adsorption device is adsorbed by the physical adsorption device on the moisture and chemical adsorbent; The adsorbed physical adsorption filler is desorbed by high-temperature heat exchange gas, and the desorbed concentrated methane gas is oxidized and burned; The high-temperature gas after combustion is recycled.

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