CN206940929U - One kind recovery valve group, gas recovery system - Google Patents

Abstract

A kind of recovery valve group, gas recovery system are the utility model is related to, gas recovery system includes blank-plate valve, recovery valve group, blower fan and deduster, the blank-plate valve and is installed on batch can coal gas efferent duct；Recovery valve group includes valve body, multiple dividing plates and multiple valve modules, and the port of export of the blank-plate valve is connected with the air admission hole, and the arrival end of the deduster is connected with the venthole, and the arrival end and the port of export of the blower fan are connected with the tube passage respectively；And the port of export of the deduster is connected with clean coal gas pipe network.By implementation of the present utility model, it can thoroughly reclaim high furnace charge and fill coal gas and ensure that high furnace charge fills coal gas and will not outside arrange and pollute environment.

Description

One kind recovery valve group, gas recovery system

Technical field

It the utility model is related to steel and iron industry technical field, more particularly to a kind of recovery valve group, coal gas gas recovery system.

Background technology

Increasingly increasingly serious the encircling of steel industry requires and Market Situation, it is desired to which iron and steel enterprise must accomplish that energy-conservation subtracts Row, reduces cost.At present, blast furnace ironmaking process discharge amount of pollution occupies the major part of whole steel industry discharge capacity, therefore, inspection Rope Iron-smelting discharge capacity seems particularly necessary.

In the prior art, it is usually directly outer to be discharged to air or collect the remaining part of a part again that high furnace charge, which fills coal gas, It is discharged into air.

Pressure-equalizing and discharging during traditional charging of blast furnace is depressed into and State of Blast Furnace top pressure to batch can using half purified gas, nitrogen Power unanimously realizes the discharge into blast furnace, and when diffusing, the raw coke oven gas in batch can is directly discharged into greatly after cyclone dust collectors rough dedusting In gas, so that batch can is diffused to normal pressure, meet batch can material feeding.

In blast furnace top pressure-equalizing bleeding process coal-gas recovering technique, from the raw coke oven gas of blast furnace bucket pressure-equalizing and discharging through pressing After diffuse channel enters cyclone dust collectors rough dusting, into cyclone dust collectors after the sack cleaner connected form purified gas. Cascade ejector after sack cleaner, purified gas are entered in clean coal gas pipe network by quick injection in the presence of injector, realized The Quick-bleeding of batch can pressure-equalizing and discharging coal gas and recovery.Injector entrance includes two entrances, respectively instrumentation tubes and injection Pipe.Instrumentation tubes are connected to be passed through by State of Blast Furnace top coal by pipeline and high top pressure gas stop valve with furnace roof clean coal tracheae The blast furnace roof purified gas of gas sack cleaner system purification dedusting.Induction tunnel is removed by pipeline and injector stop valve with cloth bag Dirt device is connected to access the purified gas after bag-type dust.In this technical scheme, because the batch can after bag-type dust diffuses coal Atmospheric pressure is less than the blast furnace roof clean coal atmospheric pressure of the high pressure by purifying and dedusting, batch can emission coal gas after bag-type dust from Induction tunnel enters in injector, the blast furnace roof purified gas of the high pressure by purifying and dedusting sprayed into from instrumentation tubes in injector Injection, and rapidly entered by injector in clean coal gas pipe network.

This way of recycling can not thoroughly reclaim coal gas in batch can, the excessive waste of resource of injection consumption of air source.And injection The purified gas side that device is mounted in after dedusting, wanting coal gas in thorough reclaimed materials filling needs two dedusters and pipeline, material filling thorough Evacuate, when it is unrealistic, second, injection medium is greatly wasted, third, recovery time is oversize to influence production.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of recovery valve group, by setting multiple valve modules and pipe Passage can be connected opening and blocking for control piper with a plurality of pipeline.

The technical scheme that the utility model solves above-mentioned technical problem is as follows：One kind recovery valve group, one kind recovery valve group, its It is characterised by, including valve body, multiple dividing plates and multiple valve modules；There is accommodation space, the side wall of the valve body in the valve body Open up air admission hole and venthole；The dividing plate is installed in the valve body and splits to form multiple chambers by the accommodation space； The air admission hole and the venthole communicate with the chamber；The madial wall of the dividing plate and/or the valve body offers opening； The valve module includes drive division and open portion, and the lower end of the drive division is connected with the upper end of the open portion, the driving Portion is installed on the lateral wall of the valve body and drives the lower end of the open portion to block or open the opening；And the valve The lateral wall of body is connected with pipeline, and the pipeline communicates to the valve inner or outside extension and with the open portion.

The beneficial effects of the utility model are：One recovery valve group, by setting multiple valve modules, multiple tube passages and chamber Room can be connected with a plurality of pipeline simultaneously, while control opening and blocking for a plurality of pipeline.

On the basis of above-mentioned technical proposal, the utility model can also do following improvement.

Further, a kind of recovery valve group, the drive division include cylinder and valve rod, and the cylinder is installed on the valve On the lateral wall of body, the output end of the cylinder is connected with the upper end of the valve rod, the lower end of the valve rod and the open portion Upper end connection, the valve rod drives the open portion closure or opens the opening.

Beneficial effect using above-mentioned further scheme is to pass through being moved upwardly or downwardly so as to open for cylinder driving stem Open portion and produce space with opening, to be turned on and off valve module so as to open or block pipeline where valve module.Can be more preferable Facilitate the keying of valve module so as to which control piper being opened or blocks.

Further, a kind of recovery valve group, the open portion include valve plate and valve seat, the lower end of the drive division and institute State valve plate connection, the valve seat in a ring and in the opening, the valve plate be arranged on the lower end of the drive division and It is adapted with the valve seat；The drive division drives the valve plate closure or opens the opening.

Further, a kind of recovery valve group, the valve plate include baffle ring and baffle plate, and the lower end of the drive division is fastened on In the baffle ring, the baffle ring is located at the upper surface of the baffle plate, and is bolted with the baffle plate.

Beneficial effect using above-mentioned further scheme is to pass through demountable structure energy between drive division, baffle ring and baffle plate Enough installations and maintenance for more facilitating valve plate.The motion of valve rod can drive valve plate to move.

Further, a kind of recovery valve group, the inner ring surface of the valve seat are the first inclined-plane, the circumferential outer of the valve plate For the second inclined-plane, the second inclined-plane adaptation is crimped on first inclined-plane and sealed against each other therewith, the madial wall of the valve seat Formed with placement o-ring groove.

It is that what sealing ring can ensure valve plate and valve seat joint place can be more using the above-mentioned further beneficial effect of scheme Good sealing.Being designed to of trapezium structure effectively limits valve plate and is moved upwardly or downwardly.

Further, a kind of recovery valve group, the tube passage include the first tube passage and the second tube passage, the valve group Part includes being distributed on the first valve, the second valve and the 3rd valve in the valve body with circumferencial direction, the chamber include first chamber, Second chamber, the 3rd chamber and the 4th chamber, the first chamber respectively with the open portion of first valve and it is described enter Stomata communicates, and the second chamber communicates with the open portion of first valve and the venthole respectively；First pipe Passage communicates with the open portion of second valve, the 3rd chamber open portion with second valve and institute respectively Air admission hole is stated to communicate；Second tube passage communicates with the open portion of the 3rd valve, the 4th chamber respectively with institute The open portion and the venthole for stating the 3rd valve communicate.

Beneficial effect using above-mentioned further scheme is the distribution that can make preferably to carry out space inside recovery valve group So as to facilitate multichannel while work.

Another technical problem to be solved in the utility model is to provide a kind of gas recovery system, can be quick and complete time Coal gas in rewinding tank.

The technical scheme that the utility model solves above-mentioned technical problem is as follows：A kind of gas recovery system, including blank-plate valve, Recovery valve group, blower fan and deduster, the blank-plate valve are installed on batch can coal gas efferent duct；As the utility model solves a upper skill The recovery valve group for the technical scheme that art problem is taken, the port of export of the blank-plate valve are connected simultaneously by pipeline with the air admission hole Connection, the arrival end of the deduster are connected and connected with the venthole by pipeline, the air admission hole and the venthole Between be communicated with the valve module；The arrival end and the port of export of the blower fan are connected and connected with the tube passage by pipeline respectively Logical, the arrival end and the port of export are communicated with the valve module by the tube passage respectively；And the deduster The port of export is connected and connected with clean coal gas pipe network.

The beneficial effects of the utility model are：The utility model extracts remaining coal in material filling out using the most fast speed of blower fan Gas, ensure that material fills the not outer row of coal gas.For economic benefit, so that volume 588 founds blast furnace as an example, gas recovery 5,800,000 is vertical within 1 year Square rice, more than 80 ten thousand yuan of coal gas power benefit；For environmental benefit, coal gas is controlled with being arranged outside the dust in coal gas, so as to more Add environmental protection.

On the basis of above-mentioned technical proposal, the utility model can also do following improvement.

Further, a kind of gas recovery system, the deduster includes gravitational precipitator and sack cleaner, described The arrival end of gravitational precipitator is connected and connected with the venthole by pipeline, and the port of export of the gravitational precipitator passes through pipe Road is connected and connected with the arrival end of the sack cleaner, and the port of export of the sack cleaner is connected simultaneously with clean coal gas pipe network Connection.

Beneficial effect using above-mentioned further scheme is the dual dedusting energy by gravitational precipitator and sack cleaner Enough make more preferably to purify coal gas, so that its degree of purification reaches the degree with coal gas in clean coal gas pipe network.

Further, a kind of gas recovery system, first tube passage are connected and connected with the arrival end of the blower fan Logical, second tube passage is connected and connected with the port of export of the blower fan.

Brief description of the drawings

Fig. 1 is that the utility model reclaims valve group cross section structure diagram；

Fig. 2 is the utility model gas recovery system structural representation.

In accompanying drawing, the list of parts representated by each label is as follows：

1st, valve body, 2, dividing plate, 3, air admission hole, 4, venthole, 5, valve module, 51, cylinder, 52, valve rod, 53, valve plate, 54, Valve seat, 531, baffle ring, 532, baffle plate, 541, sealing ring, the 110, first tube passage, the 120, second tube passage, the 510, first valve, 520th, the second valve, the 530, the 3rd valve, 10, blank-plate valve, 20, recovery valve group, 30, blower fan, 40, deduster, 401, gravitational precipitator, 402nd, sack cleaner.

Embodiment

Principle of the present utility model and feature are described below in conjunction with accompanying drawing, example is served only for explaining this practicality It is new, it is not intended to limit the scope of the utility model.

In description of the present utility model, it is to be understood that the orientation of the instruction such as term " on ", " under ", " interior ", " outer " Or position relationship is based on orientation shown in the drawings or position relationship, is for only for ease of description the utility model and simplification is retouched State, rather than instruction or imply signified device or element there must be specific orientation, with specific azimuth configuration and operation, Therefore it is not intended that to limitation of the present utility model.In description of the present utility model, " multiple " are meant that two or more, Limited unless otherwise clearly tool.

, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly Connection；Can be directly connected to, can also be indirectly connected with by intermediary, can be two element internals connection or two The interaction relationship of element.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this Concrete meaning in utility model.

Here for first choice it should be noted that " inside " is directed towards the direction in accommodation space center, " outside " is away from accommodating The direction in space center.

Referring to Fig. 1, the utility model provides a kind of recovery valve group, including valve body 1, multiple dividing plates 2 and multiple valve modules 5.There is accommodation space in valve body 1.The side wall of valve body 1 opens up air admission hole 3 and venthole 4.Dividing plate 2 is installed in valve body 1 and will Accommodation space is split to form multiple chambers.Air admission hole 3 and venthole 4 communicate with the chamber.The inner side of dividing plate 2 and/or valve body 1 Wall offers opening.Valve module 5 includes drive division and open portion.The lower end of drive division and the upper end of open portion connect.Drive division It is installed on the lateral wall of valve body 1 and drives the lower end of open portion to block or open opening.The lateral wall of valve body 1 is connected with pipe and led to Road, tube passage think that valve body 1 is internal or external and extend and communicated with open portion.

Specifically, the laying of multiple valve modules 5 for convenience, cavity can be divided into two layers up and down by dividing plate 2.

Pass through implementation of the present utility model, a recovery valve group, by setting multiple valve modules 5, multiple tube passages and chamber Room can be connected with a plurality of pipeline simultaneously, while control opening and blocking for a plurality of pipeline.Such as motion is open portion upwards It is specially the second valve 520 to open valve module 5.Drive division drives open portion to move upwards, and so as to open the second valve 520, medium enters Enter the chamber communicated with open portion after entering air admission hole 3, then pipe 110 is entered hence into the pipe outside recovery valve group by open portion Road.Medium another pipeline outside recovery valve enters pipe 120, and drive division drives open portion to move unlatching upwards, and medium passes through unlatching The chamber that portion sequentially enters while communicated with open portion and venthole 4, so as to the next pipe entered from venthole 4 outside recovery valve group Road.The second valve 520 and the 3rd valve 530 are closed, opens the first valve 510, medium enters and the open portion of the first valve 510 from air admission hole 3 The chamber communicated, then the chamber that is communicated with the open portion of the first valve 510 and venthole 4 simultaneously is entered by open portion, so as to from going out The discharge recovery valve group of stomata 4.

In one embodiment, drive division includes cylinder 51 and valve rod 52.Cylinder 51 is installed on the lateral wall of valve body 1.Vapour The output end of cylinder 51 is connected with the upper end of valve rod 52.The lower end of valve rod 52 and the upper end of open portion connect.Valve rod 52, which drives, to be opened Portion blocks or opened opening.

In one embodiment, open portion includes valve plate 53 and valve seat 54.The lower end of drive division is connected with valve plate 53.Valve seat 54 In a ring and in opening.Valve plate 53 is arranged on the lower end of drive division and is adapted with valve seat 54.Drive division drives valve plate Opening is opened in 53 closure.Specifically, valve seat 54 is installed in opening.Valve seat 54 has hole.Drive division drives valve plate 53 to block Or open the hole of valve seat 54.

Further, valve plate 53 includes baffle ring 531 and baffle plate 532.The lower end of drive division is fastened in baffle ring 531.Baffle ring 531 are located at the upper surface of baffle plate 532 and are bolted with baffle plate 532.

Specifically, the end of drive division i.e. valve rod 52 is more than the hole that the middle part of baffle ring 531 is formed, valve rod 52 The size of end above position is less than the hole that the middle part of baffle ring 531 is formed, and baffle ring 531 is set in valve from the top of valve rod 52 On bar 52, run to the end of valve rod 52 and the end of valve rod 52 is fastened in baffle ring 531 because size limits.So that valve rod 52 Baffle ring 531 is driven to move together during motion upwards.

, can be more by demountable structure between valve rod 52, baffle ring 531 and baffle plate 532 by the implementation of the present embodiment Facilitate the installation and maintenance of valve plate 53.The motion of valve rod 52 can drive valve plate 53 to move.

In one embodiment, the inner ring surface of valve seat 54 is the first inclined-plane.The circumferential outer of valve plate 53 is the second inclined-plane.Second Inclined-plane adaptation is crimped on the first inclined-plane and sealed against each other therewith.The madial wall of valve seat 54 is formed with the placement groove of sealing ring 541.Tool Body, the cross section of valve plate 53 is trapezoidal, and groove is close to trapezoidal upper bottom edge.The lateral wall of valve plate 53 and the madial wall phase of valve seat 54 Mutually it is bonded or is separated from each other to block or open the hole of valve seat 54.

Specifically, drive division i.e. valve rod 52 can use motion upwards to open valve module 5, the upper bottom edge of baffle plate 532 For the displacement moved downward below with baffle plate 532 of prescribing a time limit.Valve rod 52, which can also use to move downward, opens valve module 5, baffle plate 532 Upper bottom edge be top, and the lid of valve seat 54 sets baffle ring 531 and baffle plate 532 to limit the displacement that baffle plate 532 moves upwards.

By the implementation of the present embodiment, what sealing ring 541 can ensure valve plate 53 and the joint place of valve seat 54 can be more preferable Sealing.Being designed to of trapezium structure effectively limits valve plate 53 and is moved upwardly or downwardly.

In one embodiment, as shown in figure 1, tube passage includes the first tube passage 110 and the second tube passage 120.Valve module 5 Including the first valve 510, the second valve 520 and the 3rd valve 530 being distributed on circumferencial direction in valve body 1.Chamber include first chamber, Second chamber, the 3rd chamber and the 4th chamber.First chamber communicates with the open portion and air admission hole 3 of the first valve 510 respectively.Second Chamber communicates with the open portion and venthole 4 of the first valve 510 respectively.The open portion phase of first tube passage 110 and the second valve 520 It is logical.3rd chamber communicates with the open portion and air admission hole 3 of the second valve 520 respectively.Second tube passage 120 is opened with the 3rd valve 530 The portion of opening communicates.4th chamber communicates with the open portion and venthole 4 of the 3rd valve (530) respectively.

Specifically, laying valve module 5 for convenience, the built-in space of valve body 1 is divided into two layers up and down by dividing plate 2.In order to Facilitate the Reasonable Arrangement of chamber and effective utilization to space, the first tube passage 110 and the second tube passage 120 are lower floor's pipe respectively Passage.The open portion of first valve 510 and the second valve 520 is separately mounted on dividing plate.The open portion of 3rd valve 530 is arranged on valve body On 1 inwall.

By the implementation of the present embodiment, the first valve 510 is closed, opens the second valve 520 and the 3rd valve 530, medium is from air inlet Mouth 3 flows through the 3rd chamber, the first tube passage 110 hence into pipeline successively.Enter the second tube passage 120 from another pipeline, then The 4th chamber, venthole 4 are flowed through successively hence into pipeline.Multi-pipeline controls break-make simultaneously, is advantageous to centralized Control, saves pipe Reason.

Referring to Fig. 2, the utility model also provides a kind of gas recovery system, including blank-plate valve 10, recovery valve group 20, wind Machine 30 and deduster 40.Blank-plate valve 10 is installed on batch can coal gas efferent duct.Recovery valve group 20 as described in above-mentioned embodiment.It is blind The port of export of plate valve 10 is connected and connected with air admission hole 3 by pipeline.The arrival end of deduster 40 is connected by pipeline and venthole 4 Connect and connect.Valve module 5, specially the first valve 510 are communicated between air admission hole 3 and venthole 4.The arrival end of blower fan 30 and go out Mouth end is connected and connected with tube passage by pipeline respectively.Arrival end and the port of export are communicated with valve module 5 by tube passage respectively. Specific arrival end is communicated with the second valve 520, and the port of export is communicated with the 3rd valve 530.The port of export of deduster 40 and clean coal tracheae Net is connected and connected.

Specifically, gas recovery system of the present utility model is on the coal gas efferent duct for the batch can 100 for accessing prior art On former 200 times pipelines in parallel of diffusion valve.The of the present utility model gas recovery system in parallel with former diffusion valve 200 is normally transported Former diffusion valve 200, the work of the utility model gas recovery system are closed during row.The effect of blank-plate valve 10 be maintenance when close it is blind Plate valve 10 and cleaning coal gas.

By implementation of the present utility model, former diffusion valve 200 is closed, blank-plate valve 10 is opened, when gas pressure is big in batch can When the pressure of clean coal gas pipe network, the first valve 510 is opened, closes the second valve 520 and the 3rd valve 530.Coal gas leans on high pressure in batch can Power enters purified gas pipe network after entering deduster 40.When the pressure of coal gas in batch can and clean coal gas pipe network is close to balance, close First valve 510, open the second valve 520 and the 3rd valve 530, open blower fan 30, in batch can coal gas under the effect of blower fan 30 by the Two valves 520 enter purified gas pipe network after entering deduster 40 with the 3rd valve 530 and its pipeline connected.Until coal gas pressure in batch can Stopping blower fan 30 is run after the second valve 520 and the 3rd valve 530 are closed when power is close to 0kp.So in the second valve 520 and the 3rd valve The purpose thoroughly reclaimed is reached with no pressure in batch can when 530 actions are thoroughly closed.

In one embodiment, deduster 40 includes gravitational precipitator 401 and sack cleaner 402.Gravitational precipitator 401 Arrival end is connected and connected with venthole 4 by pipeline.The port of export of gravitational precipitator 401 passes through pipeline and sack cleaner 402 arrival end is connected and connected.The port of export of sack cleaner 402 is connected and connected with clean coal gas pipe network.

By the implementation of the present embodiment, can be made more by the dual dedusting of gravitational precipitator 401 and sack cleaner 402 It is good that coal gas is purified, so that its degree of purification reaches the degree with coal gas in clean coal gas pipe network.

In one embodiment, first tube passage 110 is connected with the arrival end of blower fan 30.Second tube passage 120 and wind The port of export connection of machine 30.

The method realized according to a kind of above-mentioned gas recovery system.Comprise the following steps.

S1, detect pressure in blast furnace bucket and when being more than purified gas ductwork pressure, open and connect blank-plate valve 10 and deduster 40 Valve module 5 on pipeline, coal gas in blast furnace bucket is set to lead directly to deduster 40 under pressure.

S2, when detecting that pressure and purified gas ductwork pressure balance in blast furnace bucket, valve module 5 in step S1 is closed, is opened Blower fan 30, and the valve module 5 being separately turned on the arrival end and port of export place pipeline of blower fan 30, make coal gas in blast furnace bucket exist Blower fan 30 attracts the lower arrival end into deduster 40.

S3, when detecting that pressure is close to 0kp in blast furnace bucket, close valve module 5 and blower fan 30 in step S2.

Specifically, in step S3, the operation that valve module 5 in step S2 turns off blower fan 30 is closed, valve module 5 can be made dynamic Just there is no pressure in batch can when accomplishing thorough closing, no coal gas is also just said, to reach the purpose thoroughly reclaimed.

By implementation of the present utility model, the utility model is two parts to the removal process of coal gas, first, batch can pressure During more than clean coal gas pipe network internal pressure power, depended on pressure reclaims naturally, takes 6 seconds or so；Second, in batch can pressure and clean coal gas pipe network Pressure recovery is carried out by blower fan during pressure balance, took for 10 or so seconds, the whole process 15-17 seconds, does not influence batch can dress completely Material.

Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model Within new spirit and principle, any modification, equivalent substitution and improvements made etc., guarantor of the present utility model should be included in Within the scope of shield.

Claims (9)

1. one kind recovery valve group, it is characterised in that including valve body (1), multiple dividing plates (2) and multiple valve modules (5)；

There is accommodation space in the valve body (1), the side wall of the valve body (1) opens up air admission hole (3) and venthole (4)；

The dividing plate (2) is installed in the valve body (1) and splits to form multiple chambers by the accommodation space；The air admission hole (3) communicated with the venthole (4) with the chamber；

The madial wall of the dividing plate (2) and/or the valve body (1) offers opening；

The valve module (5) includes drive division and open portion, and the lower end of the drive division is connected with the upper end of the open portion, institute Drive division is stated to be installed on the lateral wall of the valve body (1) and drive the lower end of the open portion to block or open the opening；

And the lateral wall of the valve body (1) is connected with tube passage, the tube passage extends to the valve body (1) is internal or external And communicated with the open portion.

2. a kind of recovery valve group according to claim 1, it is characterised in that the drive division includes cylinder (51) and valve rod (52), the cylinder (51) is installed on the lateral wall of the valve body (1), output end and the valve rod of the cylinder (51) (52) upper end connection, the lower end of the valve rod (52) are connected with the upper end of the open portion, described in valve rod (52) drive Open portion blocks or opened the opening.

3. a kind of recovery valve group according to claim 1, it is characterised in that the open portion includes valve plate (53) and valve seat (54), the lower end of the drive division is connected with the valve plate (53), the valve seat (54) in a ring and in the opening, The valve plate (53) is arranged on the lower end of the drive division and is adapted with the valve seat (54)；The drive division drives the valve Plate (53) blocks or opened the opening.

4. a kind of recovery valve group according to claim 3, it is characterised in that the valve plate (53) includes baffle ring (531) and gear Plate (532), the lower end of the drive division are fastened in the baffle ring (531), and the baffle ring (531) is located at the baffle plate (532) Upper surface, and be bolted with the baffle plate (532).

5. a kind of recovery valve group according to claim 3, it is characterised in that the inner ring surface of the valve seat (54) is first oblique Face, the circumferential outer of the valve plate (53) is the second inclined-plane, and second inclined-plane adaptation is crimped on first inclined-plane and therewith Seal against each other, formed with placement sealing ring (541) groove on the inner ring surface of the valve seat (54).

6. according to a kind of any one of claim 1 to 5 recovery valve group, it is characterised in that the tube passage includes the first pipe Passage (110) and the second tube passage (120), the valve module (5) include the be distributed on circumferencial direction in the valve body (1) One valve (510), the second valve (520) and the 3rd valve (530), the chamber include first chamber, second chamber, the 3rd chamber and the Four chambers,

The first chamber communicates with the open portion and the air admission hole (3) of first valve (510) respectively, and described second Chamber communicates with the open portion and the venthole (4) of first valve (510) respectively；

First tube passage (110) communicates with the open portion of second valve (520), the 3rd chamber respectively with institute The open portion and the air admission hole (3) for stating the second valve (520) communicate；

Second tube passage (120) communicates with the open portion of the 3rd valve (530), the 4th chamber respectively with institute The open portion and the venthole (4) for stating the 3rd valve (530) communicate.

7. a kind of gas recovery system, it is characterised in that including blank-plate valve (10), as any one of claim 1 to 6 Valve group (20), blower fan (30) and deduster (40) are reclaimed,

The blank-plate valve (10) is installed on batch can coal gas efferent duct；

The port of export of the blank-plate valve (10) is connected and connected with the air admission hole (3) by pipeline, the deduster (40) Arrival end is connected and connected with the venthole (4) by pipeline, is connected between the air admission hole (3) and the venthole (4) There is the valve module (5)；The arrival end and the port of export of the blower fan (30) are connected and connected with the tube passage by pipeline respectively Logical, the arrival end and the port of export are communicated with the valve module (5) by the tube passage respectively；

And the port of export of the deduster (40) is connected and connected with clean coal gas pipe network.

8. a kind of gas recovery system according to claim 7, it is characterised in that the deduster (40) includes gravitational dust collection Device (401) and sack cleaner (402), the arrival end of the gravitational precipitator (401) are connected by pipeline and the venthole (4) Connect and connect, the port of export of the gravitational precipitator (401) is connected by pipeline with the arrival end of the sack cleaner (402) And connect, the port of export of the sack cleaner (402) is connected and connected with clean coal gas pipe network.

9. according to a kind of gas recovery system of claim 7 or 8, it is characterised in that it is logical that the tube passage includes the first pipe Road (110) and the second tube passage (120), first tube passage (110) are connected and connected with the arrival end of the blower fan (30), Second tube passage (120) is connected and connected with the port of export of the blower fan (30).