Carbon filtering device for preparing helium from coalbed methane

Abstract

The utility model relates to the technical field of coal resource utilization, in particular to a carbon filtering device for preparing helium from coalbed methane, and aims to solve the problems that in the process of preparing helium from coalbed methane at present, small-particle active carbon in mixed return gas is extremely easy to block a water-ring vacuum pump, so that the vacuum pump breaks down, and the helium is wasted. Therefore, the overall efficiency of helium preparation is influenced. The device mainly comprises a bypass pipe, flanges, a slag discharge valve, a pipeline elbow, filter screens clamped on the inner sides of the flanges and the like, and multiple rows of flanges and filter screens are additionally arranged at the pipeline elbow between a pressure swing adsorption tower and a water-ring vacuum pump, so that multi-layer filtration of small-particle activated carbon in mixed return gas is realized; the bypass pipe and the gate valve are arranged between the outlet of the adsorption tower and the filter screen at the tail end, so that the filter screen is effectively washed and cleaned reversely by the mixed gas, filter residues are discharged through the residue discharge valve, the cleaning effect of the filter screen is further improved, and the cleanliness of the mixed gas entering the water-ring vacuum pump is greatly ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal resource utilization technical field, concretely relates to a filter carbon device for coal bed gas preparation helium. BACKGROUND

[0002] In the process of preparing helium from coal bed gas, the mixed return gas after the separation of helium by the desorption process of the pressure swing adsorption tower is sent to the membrane separator, and the remaining methane, nitrogen and carbon dioxide are adsorbed by the activated carbon medium in the adsorption tower, and then are pumped to the coal bed gas storage tank by the water ring vacuum pump at a negative pressure of-0.07MPa for power generation. In the process of pumping the mixed return gas from the pressure swing adsorption tower to the vacuum pump, the small particles of activated carbon in the adsorption tower are sucked into the vacuum pump together with the mixed return gas through the pipeline, which easily causes the obstruction of the shaft water seal of the water ring vacuum pump, and in severe cases, causes the water leakage of the pump body and even the shutdown of the pump, which greatly affects the delivery of the mixed return gas and the overall preparation efficiency of helium. SUMMARY

[0003] The utility model provides a filter carbon device for coal bed gas preparation helium to solve the problems in the above background.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A filter carbon device for coal bed gas preparation helium, comprising a pressure swing adsorption tower, the pressure swing adsorption tower is connected with a water ring vacuum pump through a pipeline, a butterfly valve is connected with the output pipeline at the bottom of the pressure swing adsorption tower, the butterfly valve is connected with a pipeline elbow through a second connecting flange, the pipeline elbow is connected with the water ring vacuum pump through a first connecting flange, and the inner sides of the first connecting flange and the second connecting flange are detachably provided with filter screens.

[0006] Further, the output end of the butterfly valve is connected with a short connecting pipeline, the short connecting pipeline is connected with the second connecting flange, and a second deslagging valve is further arranged at the bottom of the short connecting pipeline.

[0007] Further, a first deslagging valve is arranged at the bottom of the side of the pipeline elbow close to the second connecting flange.

[0008] Further, a bypass pipe is arranged in communication at the top of the output pipeline between the pressure swing adsorption tower and the butterfly valve, the bypass pipe is connected to the output pipeline side of the first connecting flange, and a bypass pipe gate valve is further arranged on the bypass pipe.

[0009] Further, a rubber sealing ring is further fixedly connected to the outer edge side of the filter screen.

[0010] The utility model has the following beneficial effects:

[0011] The utility model provides a kind of filter carbon device for coalbed gas preparation helium, by installing multiple rows of flange and filter screen at the pipe bend between pressure swing adsorption tower and water ring vacuum pump, realize multilayer filtration to small particle activated carbon in mixed return gas;Bypass pipe and gate valve are further provided between adsorption tower outlet and terminal filter screen, effectively realize the reverse flushing cleaning of mixed gas to filter screen, and filter residue is discharged through discharge valve, further improve the cleaning efficiency of filter screen, greatly ensure the cleanliness of mixed gas into water ring vacuum pump, solve the problem that small particle activated carbon in mixed return gas is easy to block water ring vacuum pump during the preparation of helium from coalbed gas at present, and cause vacuum pump failure, thereby affecting the overall efficiency of helium preparation.

[0012] In the utility model, the rubber sealing ring in the connecting flange is integrated with the filter screen, which satisfies the sealing of the flange and realizes efficient filtration of activated carbon impurities. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is overall structure schematic diagram of the utility model.

[0014] Fig. 2 It is filter screen structure schematic diagram of the utility model.

[0015] The meanings of the reference signs are as follows:

[0016] 1, pressure swing adsorption tower;2, bypass pipe gate valve;3, bypass pipe;4, first connecting flange;5, pipe bend;6, first discharge valve;7, second connecting flange;8, second discharge valve;9, short connecting pipe;10, butterfly valve;11, water ring vacuum pump;12, rubber sealing ring;13, filter screen. DETAILED DESCRIPTION

[0017] The utility model will be further described in connection with the drawings and specific embodiment.

[0018] As shown in Figs. 1-2 A filter carbon device for coalbed gas preparation helium, comprising a pressure swing adsorption tower 1, the pressure swing adsorption tower 1 is connected with water ring vacuum pump 11 by pipeline, the bottom output pipeline of pressure swing adsorption tower 1 is connected with butterfly valve 10, butterfly valve 10 is connected with pipe bend 5 by second connecting flange 7, pipe bend 5 is connected with water ring vacuum pump 11 by first connecting flange 4, and the inner side of first connecting flange 4 and second connecting flange 7 is detachably provided with filter screen 13.

[0019] The output end of butterfly valve 10 is connected with short connecting pipe 9, short connecting pipe 9 is connected with the second connecting flange 7, and the bottom of short connecting pipe 9 is further provided with second discharge valve 8.

[0020] The first slag valve 6 is arranged at the bottom of the pipe bend 5 near the side of the second connecting flange 7.

[0021] The bypass pipe 3 is arranged at the top of the output pipe between the pressure swing adsorption tower 1 and the butterfly valve 10, and is connected to the output pipe side of the first connecting flange 4.

[0022] The outer edge side of the filter screen 13 is further fixedly connected with the rubber sealing ring 12.

[0023] In specific application, the 200-mesh and 300-mesh metal filter screens 13 are respectively arranged at the flange connecting positions of the pipe bend 5 with an outer diameter of 245 mm between the water ring vacuum pump 11 and the pressure swing adsorption tower 1, and serve as first and second filter screens.

[0024] The bypass pipe 3, the bypass pipe gate valve 2, the butterfly valve 10, the short connecting pipe 9, the first slag valve 6 and the second slag valve 8 are sequentially arranged on the pipe along the gas flow direction from the pressure swing adsorption tower 1 to the water ring vacuum pump 11.

[0025] When the filter screen 13 and the rubber sealing ring 12 are blocked and need to be cleaned, the butterfly valve 10 is closed, the bypass pipe gate valve 2 and the first slag valve 6 and the second slag valve 8 are opened, and the water ring vacuum pump 11 is stopped.

[0026] After the filter screen 13 and the rubber sealing ring 12 are cleaned, the bypass pipe gate valve 2, the first deslagging valve 6 and the second deslagging valve 8 are closed, the butterfly valve 10 is opened, and the water ring vacuum pump 11 is started, so that the system is normally operated; when the filter screen 13 and the rubber sealing ring 12 are aged and damaged, the first connecting flange 4 and the second connecting flange 7 connecting bolts on both sides of the pipeline elbow 5 are removed, and the filter screen 13 and the rubber sealing ring 12 are replaced, so that the whole filtering process of the mixed return gas is effectively ensured, the cleanliness of the mixed gas entering the water ring vacuum pump 11 is greatly improved, and the overall efficiency of the helium preparation is greatly improved, so that the device has good practicability.

Claims

1. A carbon filtration device for preparing helium from coalbed methane, comprising a pressure swing adsorption tower (1), wherein the pressure swing adsorption tower (1) is connected to a water ring vacuum pump (11) via a pipeline, characterized in that: The bottom output pipe of the pressure swing adsorption tower (1) is connected to a butterfly valve (10). The butterfly valve (10) is connected to a pipe elbow (5) through a second connecting flange (7). The pipe elbow (5) is connected to a water ring vacuum pump (11) through a first connecting flange (4). Filter screens (13) can be detachably installed on the inner sides of both the first connecting flange (4) and the second connecting flange (7).

2. The carbon filtration device for preparing helium from coalbed methane according to claim 1, characterized in that: The output end of the butterfly valve (10) is connected to a short pipe (9), which is connected to the second connecting flange (7), and a second slag discharge valve (8) is provided at the bottom of the short pipe (9).

3. The carbon filtration device for preparing helium from coalbed methane according to claim 1, characterized in that: The bottom of the pipe elbow (5) near the second connecting flange (7) is provided with a first slag discharge valve (6).

4. The carbon filtration device for preparing helium from coalbed methane according to claim 1, characterized in that: A bypass pipe (3) is connected to the top of the output pipe between the pressure swing adsorption tower (1) and the butterfly valve (10). The bypass pipe (3) is connected to the output pipe side of the first connecting flange (4). A bypass pipe gate valve (2) is also provided on the bypass pipe (3).

5. A carbon filtration device for preparing helium from coalbed methane according to claim 1, characterized in that: A rubber sealing ring (12) is also fixedly connected to the outer edge of the filter screen (13).

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