Resource recycling device for low-concentration gas

Abstract

The utility model relates to a resource recycling device for low-concentration gas, which comprises a dust remover and a low-concentration gas enrichment device, the inlet end of the dust remover is connected with a low-concentration gas source pipeline through a gas inlet pipeline, and the outlet end of the dust remover is connected with the low-concentration gas enrichment device through a gas outlet pipeline I; the low-concentration gas enrichment device comprises at least two groups of adsorption tanks, a gas inlet adsorption pipeline is arranged at the bottom of each group of adsorption tanks and is connected with a gas outlet pipeline I in parallel, a gas outlet pipeline II is arranged at the top of each group of adsorption tanks and is connected with a gas exhaust header pipe I in parallel, and the gas exhaust header pipe I is connected with a gas outlet pipe II in parallel. The exhaust manifold I is connected with a combustion-supporting air pipeline of an internal combustion engine power generation set or a heat accumulating type oxidation combustion furnace; according to the utility model, effective components of low-concentration gas can be recovered, the utilization rate of the gas is improved, the income is increased, and greenhouse gas is prevented from being exhausted into the environment due to incapability of being utilized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to coal mine gas extraction system technical field, concretely relates to a device for low concentration gas gasification recycling. BACKGROUND

[0002] 70% of the coal-bed gas mined in China every year belongs to low concentration gas, so much low concentration gas is not directly utilized but selected to be emptied, which causes resource waste and increases environmental pollution. Gas mainly comprises methane, nitrogen and oxygen, and the greenhouse gas effect of methane is 21 times that of CO2. Coal mine gas is divided into high negative pressure system extracted gas and ground drilling extracted gas, and the concentration thereof is generally greater than 30%, which is mainly applied to small gas turbine and high concentration internal combustion engine power generation; the concentration of low negative pressure system extracted gas is generally less than 30%, which is mainly applied to low concentration internal combustion engine power generation; the concentration of mine return air shaft exhaust gas (exhaust air gas) is generally below 1%, and the mixed gas of low concentration gas and mine exhaust air gas is mainly used to enter a heat counterflow reactor and a catalytic oxidation reactor to generate power by oxidation. The low concentration exhaust air gas oxidation power generation system has high cost, low thermal power efficiency and poor economic benefit. Internal combustion engine power generation utilizes gas volume fraction of 5% to 25%, and the utilization rate is generally 20% to 30%, in order to prevent shutdown caused by gas concentration fluctuation, the gas volume fraction is generally controlled to be above 8%. Low concentration gas below 5% cannot be directly utilized by the internal combustion engine set. Generally, the low concentration gas is mixed with exhaust air gas to enter an RTO heat accumulation oxidation combustion to generate high-temperature waste gas, and the waste gas is exchanged by a waste heat boiler to drive a steam turbine to generate power or heat a mining area to recycle heat energy. The overall utilization rate of the treatment mode is extremely low (generally less than 2%), the economic benefit is poor, and when the gas concentration is below 0.5%, the heat is utilized to generate power without any economic efficiency, and the gas can only be directly discharged after combustion. CONTENT OF THE UTILITY MODEL

[0003] In view of the problems in the prior art, the utility model provides a device for low concentration gas gasification recycling, which can recycle effective components of low concentration gas, improve the utilization rate of gas, increase the income, and prevent greenhouse gas from being discharged into the environment.

[0004] The utility model discloses a technical scheme that solves above technical problem provides a kind of for low concentration gas gas resource recycling device, including dust catcher and low concentration gas gas enrichment device, the dust catcher import end is connected low concentration gas source pipeline by gas inlet pipeline, this dust catcher export is connected the low concentration gas gas enrichment device by gas outlet pipeline one, the low concentration gas gas enrichment device includes at least two groups of adsorption tank, and each group of adsorption tank bottom is provided with gas inlet adsorption pipeline, and the gas inlet adsorption pipeline is connected and is connected in parallel gas outlet pipeline one, and the top of each group of adsorption tank is provided with gas outlet pipeline two, and the gas outlet pipeline two is connected in parallel exhaust main pipe one, and the exhaust main pipe one is connected with the combustion air duct of internal combustion engine power generation group or regenerative oxidation combustion furnace.

[0005] The utility model further defined technical scheme is as follows:

[0006] Preferably, a gas buffer tank one is arranged between the dust remover outlet and the low concentration gas gas enrichment device inlet, and a booster fan one is arranged at the outlet of the gas buffer tank.

[0007] Preferably, a waste gas discharge pipeline is arranged on the exhaust main pipe, and the waste gas discharge pipeline is connected with a chimney.

[0008] Preferably, a gas outlet pipeline three is arranged on each gas inlet adsorption pipeline, the gas outlet pipeline three is connected in parallel with a gas outlet main pipe two, the gas outlet main pipe two is connected with an internal combustion engine gas main pipe, and a vacuum pump, a buffer tank two and a booster fan two are sequentially arranged on the gas outlet main pipe two from front to back.

[0009] Preferably, the dust remover is a bag-type dust remover.

[0010] Preferably, a condensate discharge port is formed at the bottom of the chimney.

[0011] Preferably, activated carbon adsorbent is filled in the adsorption tank, and the adsorbent is a special adsorbent for separating N2 and O2, and is filled in layers to prevent the concentration of O2 in the product gas from rising after N2 is separated and to avoid the product gas concentration being within the explosion limit range.

[0012] The utility model has the advantages that:

[0013] The utility model recycles effective components of low concentration gas, improves the utilization rate of gas, increases the income, and prevents greenhouse gases from being discharged into the environment;

[0014] The dust remover uses bag-type dust removal to remove solid particles carried in the gas, so that the solid particles do not enter the rear-end gas enrichment device to affect the operation of the gas enrichment device; a booster fan is arranged at the rear end of the dust remover to boost the low concentration gas, so as to overcome the resistance of pipeline, dust remover, valve and other equipment systems, and maintain the necessary working pressure of the gas enrichment device.

[0015] The gas enrichment device is composed of at least two groups of adsorption tanks, is used for separating non-CH4 components in low-concentration gas, and makes the CH4 concentration in product gas reach more than 8%; the waste gas containing a small amount of CH4 in the adsorption tank is directly connected to a chimney and discharged to the atmosphere, and a part is introduced to a combustion-supporting air main pipe of an internal combustion engine generator set and is used for supplementing air distribution;

[0016] The utility model discloses set buffer tank one and buffer tank two for stabilizing gas flow, prevent the system from causing the device operation instability because of gas flow fluctuation, also be used for stabilizing its corresponding booster fan inlet pressure simultaneously, buffer tank two outlet is provided with booster fan no. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0018] EMBODIMENT

[0019] The embodiment provides a kind of for low-concentration gas resource recycling device, as shown in Fig. Figure 1 The dust collector 1 inlet end is connected to the low-concentration gas source pipeline 2 through the gas inlet pipeline, the dust collector outlet is connected to the low-concentration gas enrichment device through the gas outlet pipeline one, and the gas buffer tank one 3 is arranged between the dust collector outlet and the low-concentration gas enrichment device inlet, and the booster fan one 4 is arranged at the outlet of the gas buffer tank one 3.

[0020] The low-concentration gas enrichment device includes two groups of adsorption tanks 5, the adsorption tank is filled with activated carbon adsorbent, the adsorbent uses special adsorbent for separating N2 and O2, and is filled in layers, and the bottom of each adsorption tank is provided with the gas inlet adsorption pipeline 6, which is connected to the gas outlet pipeline one 7 in parallel connection, and the top of each adsorption tank is provided with the gas outlet pipeline two 8, which is connected to the exhaust main pipe one 9 in parallel connection, the exhaust main pipe one is connected to the combustion-supporting air pipeline 10 of the internal combustion engine generator set 20, and the exhaust main pipe one 9 is provided with the waste gas discharge pipeline 11, which is connected to the chimney 12, and the chimney bottom is provided with the condensate discharge port 13.

[0021] The gas outlet pipeline three 14 is arranged on each gas inlet adsorption pipeline, which is connected to the gas main pipe two 15 in parallel connection, and the gas main pipe two is connected to the internal combustion gas main pipe 16, and the vacuum pump 17, the buffer tank two 18 and the booster fan two 19 are sequentially arranged on the gas main pipe two from front to back.

[0022] The dust collector of the embodiment adopts a bag type dust collector to remove solid particles carried in the gas to avoid affecting the operation of the gas enrichment device; a booster fan is arranged at the rear end of the dust collector to boost the low-concentration gas to overcome the resistance of the pipeline, the dust collector, the valve and other equipment systems and maintain the necessary working pressure of the gas enrichment device;

[0023] The gas enrichment device of the embodiment is composed of at least two groups of adsorption tanks, which are used to separate the non-CH4 components in the low-concentration gas, so that the CH4 concentration in the product gas reaches more than 8%, and the waste gas containing a small amount of CH4 in the adsorption tank is directly connected to a chimney to be discharged into the atmosphere, a part of which is introduced into an internal combustion engine generator set or a regenerative oxidation combustion furnace to supplement the combustion air;

[0024] The buffer tank one and the buffer tank two are arranged to stabilize the gas flow, prevent the system from being unstable due to the fluctuation of the gas flow, and also stabilize the inlet pressure of the corresponding booster fan; the outlet of the buffer tank two is provided with a booster fan two to increase the pressure of the product gas to be equivalent to the original gas fuel source;

[0025] The vacuum pump of the embodiment adopts a dry vacuum pump to ensure that the product gas of the system is dry and clean, which can be directly used as a gas fuel by the internal combustion engine generator set or the regenerative oxidation combustion furnace.

[0026] In addition to the above embodiments, the utility model can also have other implementation manners, and any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the utility model.

Claims

1. A device for recycling and utilizing low-concentration gas resources, comprising a dust remover and a low-concentration gas enrichment device, characterized in that: The dust remover inlet end is connected with a low-concentration gas source pipeline through an air inlet pipeline, the dust remover outlet end is connected with the low-concentration gas enrichment device through an air outlet pipeline I, the low-concentration gas enrichment device comprises at least two groups of adsorption tanks, each group of adsorption tanks is provided with an air inlet adsorption pipeline at the bottom, the air inlet adsorption pipeline is connected with the air outlet pipeline I in parallel, each group of adsorption tanks is provided with an air outlet pipeline II at the top, the air outlet pipeline II is connected with an exhaust main pipeline I in parallel, and the exhaust main pipeline I is connected with a combustion-supporting air pipeline of an internal combustion engine generator set or a regenerative oxidation combustion furnace.

2. The device for recycling and utilizing low-concentration gas according to claim 1, characterized in that: A gas buffer tank I is arranged between the dust remover outlet and the low-concentration gas enrichment device inlet, and a booster fan I is arranged at the outlet of the gas buffer tank.

3. The device for recycling and utilizing low-concentration gas according to claim 1, characterized in that: An exhaust pipeline is arranged on the exhaust main pipeline and connected with a chimney.

4. The device for recycling and utilizing low-concentration gas according to claim 1, characterized in that: An air outlet pipeline III is arranged on each air inlet adsorption pipeline, the air outlet pipeline III is connected with an air outlet main pipeline II in parallel, the air outlet main pipeline II is connected with an internal combustion engine gas main pipeline, and a vacuum pump, a buffer tank II and a booster fan II are sequentially arranged on the air outlet main pipeline II from front to back.

5. The device for recycling and utilizing low-concentration gas according to claim 1, characterized in that: The dust remover is a bag-type dust remover.

6. The device for recycling and utilizing low-concentration gas according to claim 3, characterized in that: A condensate discharge port is arranged at the bottom of the chimney.

7. The device for recycling and utilizing low-concentration gas according to claim 1, characterized in that: Activated carbon adsorbents are filled in the adsorption tanks, and the adsorbents are special adsorbents for separating N2 and O2 and are filled in layers.

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