CN214496206U - Slag discharging device and gasification system - Google Patents

Abstract

The disclosure relates to the technical field of coal gasification, in particular to a slag discharging device and a gasification system. The slag discharging device comprises a slag discharging pipeline and a slag discharging regulation and control component, wherein the slag discharging pipeline is provided with a slag inlet which is communicated with a slag discharging port of the gasification furnace. The slag discharging regulation and control part comprises an adjuster and a driving part, the adjuster is positioned inside the slag discharging pipeline, a gap for ash falling is formed between the adjuster and the inner wall of the slag discharging pipeline, and the driving part is used for driving the adjuster to rotate so as to adjust the size of the gap. Thereby can control the discharge amount and the discharge time of arranging the inside lime-ash of sediment pipeline through the change of clearance size, consequently have the controllable and stable advantage of row's sediment volume of row sediment volume, and then solved gas accuse and arrange sediment and have row sediment volume unstability and uncontrollable problem, can make the stable operation of gasifier.

Description

Slag discharging device and gasification system

Technical Field

The disclosure relates to the technical field of coal gasification, in particular to a slag discharging device and a gasification system.

Background

The coal gasification technology is an important way for realizing clean and efficient utilization of coal. The pressurized fluidized bed gasification furnace is widely applied to the pulverized coal gasification process due to uniform bed temperature, sufficient gas-solid contact and loose reaction conditions.

The existing fluidized bed gasification furnace has the big problems of poor slag discharging controllability, high residual carbon content in discharged bottom slag and low overall carbon conversion rate. The existing slag discharging system controls the slag discharging amount by introducing a certain amount of gas into a slag discharging pipeline and adjusting the gas amount, but the gas control slag discharging mode has more factors, such as working condition fluctuation of a gasification furnace, bed layer change, upstream and downstream pressure fluctuation of the communicating slag discharging pipeline, ash temperature and the like, when the downstream pressure is low, the introduced slag discharging adjusting and controlling gas can go down, the falling ash cannot be effectively supported, and the slag discharging amount is increased. Therefore, the problem of unstable and uncontrollable slag discharge amount exists in the pneumatic control slag discharge mode, and the stable operation of the gasification furnace is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a slag discharging device and a gasification system.

The present disclosure provides a slag discharge device for being connected with a gasification system, including:

the slag discharging pipeline is provided with a slag inlet which is communicated with a slag discharging port of the gasification furnace;

the slag discharging regulation and control component comprises an adjuster and a driving component, the adjuster is positioned inside the slag discharging pipeline, a gap for ash falling is formed between the adjuster and the inner wall of the slag discharging pipeline, and the driving component is used for driving the adjuster to rotate so as to adjust the size of the gap.

The driving part drives the regulator to move, the size of a gap between the regulator and the inner wall of the slag discharging pipeline is regulated through the movement of the regulator, and the discharge amount and the discharge time of ash slag in the slag discharging pipeline are controlled through the change of the size of the gap.

Optionally, the driving part comprises a driving part and a connecting shaft, the adjuster is connected with the driving part through the connecting shaft, and the driving part is used for driving the connecting shaft to rotate so that the connecting shaft drives the adjuster to rotate.

Optionally, the adjuster comprises an adjustment plate, the thickness of the adjustment plate gradually decreasing from the centre of the adjustment plate to the edge of the adjustment plate.

Optionally, the adjusting plate is provided with a plurality of slag falling holes for allowing the ash to fall.

Optionally, the slag discharging device further comprises a connecting tank, the connecting tank is communicated with the gasification furnace through the slag discharging pipeline, and ash in the slag discharging pipeline is discharged to the connecting tank;

the connecting tank is characterized in that a through hole through which the connecting shaft can penetrate out is formed in the tank wall of the connecting tank, and a sealing component is arranged between the connecting shaft and the through hole.

Optionally, a pressure difference control pipeline for controlling the pressure difference between the connecting tank and the gasification furnace is connected between the connecting tank and the gasification furnace.

Optionally, the upper part of the connecting tank is of a cylindrical structure, and the inner diameter of the slag discharge pipeline is 0.15-0.25 times of the inner diameter of the cylindrical structure on the connecting tank.

Optionally, one end of the connecting tank, which is far away from the slag discharge pipeline, is connected with a cooling pipeline, and ash in the connecting tank is discharged to the cooling pipeline;

at least one first nozzle group is arranged inside the cooling pipeline and used for spraying a cooling substance to the ash in the cooling pipeline;

and the spraying pressure of the first nozzle group for spraying the cooling material is 1.5-3 times of the internal pressure of the cooling pipeline.

Optionally, when the first nozzle group is provided in plurality, the plurality of first nozzle groups are vertically arranged along the inner wall of the cooling duct.

Optionally, one end of the cooling pipeline, which is far away from the connecting tank, is connected with a cold slag tank, and ash in the cooling pipeline is discharged to the cold slag tank;

the second nozzle groups are symmetrically arranged at positions, close to the cooling pipeline, in the cold slag tank and used for spraying cooling substances to ash residues in the cold slag tank;

and the spraying pressure of the second nozzle group for spraying the cooling material is 1.5-3 times of the internal pressure of the cold slag tank.

Optionally, one end of the cold slag tank, which is far away from the cooling pipeline, is connected with a slag hopper, and ash in the cold slag tank is discharged to the slag hopper;

one end of the slag hopper, which is far away from the cold slag tank, is connected with a lock hopper, and ash in the slag hopper is discharged into the lock hopper;

and a discharge device is connected between the lock hopper and the differential pressure control pipeline and is used for filtering and discharging gas in the lock hopper and the differential pressure control pipeline.

The present disclosure also provides a gasification system comprising: a gasification furnace and the slag discharge device;

the gasification furnace is provided with a slag discharge port, and the slag inlet is communicated with the slag discharge port.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the slag discharging device provided by the embodiment of the disclosure comprises a slag discharging pipeline and a slag discharging regulation and control component, wherein the slag discharging pipeline is provided with a slag inlet which is communicated with a slag discharging port of a gasification furnace. The slag discharging regulation and control part is at least partially positioned in the slag discharging pipeline and comprises an adjuster and a driving part, a gap for ash falling is formed between the adjuster and the inner wall of the slag discharging pipeline, and the driving part is used for driving the adjuster to rotate so as to adjust the size of the gap. Thereby can control the discharge amount and the discharge time of arranging the inside lime-ash of sediment pipeline through the change of clearance size, consequently have the controllable and stable advantage of row's sediment volume of row sediment volume, and then solved gas accuse and arrange sediment and have row sediment volume unstability and uncontrollable problem, can make the stable operation of gasifier.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a slag discharge device according to an embodiment of the disclosure;

fig. 2 is a partially enlarged view of fig. 1.

Wherein the content of the first and second substances,

1. a slag discharge pipeline; 2. a slag discharge regulation and control component; 21. a regulator; 22. a drive member; 23. a connecting shaft; 24. a sealing member; 3. a jet pipe; 4. a connecting tank; 5. a differential pressure control conduit; 6. a cooling duct; 61. a first nozzle group; 7. a cold slag tank; 71. a second nozzle group; 8. a slag hopper; 9. locking the bucket; 10. a discharge device; 100. a gasification furnace; 101. a distribution plate.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

As shown in fig. 1-2, the slag discharging device provided in the embodiment of the present disclosure includes a slag discharging pipeline 1 and a slag discharging regulation component 2, where the slag discharging pipeline 1 has a slag inlet, and the slag inlet is used for communicating with a slag discharging port of the gasification furnace 100 and discharging ash in the gasification furnace 100. Arrange sediment regulation and control part 2 and include regulator 21 and driver part, regulator 21 is located and arranges sediment pipeline 1 inside, and regulator 21 can with arrange the clearance that forms between the inner wall of sediment pipeline 1 and be used for supplying the lime-ash whereabouts, driver part is used for driving the regulator and rotates, with the size in regulation clearance, thereby can control the discharge amount and the discharge time of arranging the inside lime-ash of sediment pipeline 1 through the change of clearance size, consequently, the advantage that the discharge amount is controllable and the discharge amount is stable has, and then solved gas accuse and arrange sediment and have discharge amount unstability and uncontrollable problem, can make the stable operation of gasifier 100.

Wherein, the regulator 21 mainly forms a gap for ash falling through the edge of the regulator 21 and the inner wall of the slag discharging pipeline 1, and the regulator is driven to rotate through the driving part to regulate the size of the gap, so that the discharging amount and the discharging time of the ash in the slag discharging pipeline 1 can be controlled through the change of the size of the gap.

In some embodiments, the driving component comprises a driving part 22 and a connecting shaft 23, the adjuster 21 is connected with the driving part 22 through the connecting shaft 23, the driving part 22 is used for driving the connecting shaft 23 to rotate, so that the connecting shaft 23 drives the adjuster 21 to rotate, and the size of a gap formed between the adjuster 21 and the inner wall of the slag discharge pipeline 1 is adjusted, and therefore the residence time of the ash slag in the slag discharge pipeline 1 is adjusted.

The driving member may be a motor, and the connecting shaft 23 is driven by the motor to rotate, so as to drive the adjuster 21 to rotate through the connecting shaft 23.

The connection shaft 23 may be manually driven, as long as the connection shaft 23 can be rotated.

In some embodiments, the adjuster 21 may be an adjusting plate, the thickness of the adjusting plate gradually decreases from the center of the adjusting plate to the edge of the adjusting plate, and due to contact with high-temperature ash, the thickness of the adjusting plate is as easy as stress concentration, so that the plate is deformed, and the adjusting plate cannot be rotated.

Wherein, the size of regulating plate slightly is less than the size of arranging sediment pipeline 1 internal diameter, the regulation of the regulating plate of being convenient for.

In addition, a plurality of slag falling holes are formed in the adjusting plate and used for discharging ash slag, and even in a fully closed state, a small amount of ash slag is discharged from the slag discharging holes, so that the continuity of slag discharging is ensured. Meanwhile, the existence of the slag falling hole can effectively absorb the thermal stress of the adjusting plate, the adjusting plate is guaranteed not to deform and damage under the environment with higher temperature, the adjusting plate cannot be closed, and the problem of short service life is solved.

The regulator 21 may also be a regulating block, and the edge of the regulating block may be thinned to avoid stress concentration during use.

In some embodiments, the slag discharging device includes a jet pipe 3, and the jet pipe 3 extends to the bottom of the gasification furnace 100 through a slag discharging pipe for loosening ash in the gasification furnace 100.

Wherein, set up the import on the lateral wall of sediment pipeline 1 lower part, jet pipe 3 stretches into in sediment pipeline 1 through the import, then extends to the bottom of gasifier 100, carries high-speed jet gas to the lime-ash of gasifier 100 bottom, improves gasifier 100 internal gas rigid contact heat transfer volume and discharge time, strengthens the bed turbulent motion degree.

In some embodiments, the slag discharging device includes a connection tank 4, the connection tank 4 is communicated with the gasification furnace 100 through the slag discharging pipeline 1, and the ash in the slag discharging pipeline 1 is discharged through the connection tank 4. The tank wall of the connecting tank 4 is provided with a through hole through which the connecting shaft 23 can penetrate, and a sealing component 24 is arranged between the connecting shaft 23 and the through hole. By providing the sealing member 24, ash in the connecting tank 4 can be prevented from escaping outward, and the sealing can be maintained, while the life of the sealing member is ensured.

Wherein, be connected with pressure differential control pipeline 5 between connecting tank 4 and gasification furnace 100, pressure differential control pipeline 5 is arranged in controlling connecting tank 4 and the pressure differential among the gasification system, judges the smooth and easy condition of sediment that falls through pressure differential, if pressure differential is too high, arrange sediment pipeline 1 probably have the windrow, the ash and slag whereabouts is not smooth the condition, the degree of opening and shutting of regulating plate this moment, open gaseous outer discharge pipeline valve simultaneously, reduce the inside pressure of connecting tank 4 slightly, make the ash and slag smoothly fall.

The sealing member 24 is a cooling sealing member, and may be a circulating cooling water jacket or an air cooling jacket, for example, to keep the temperature of the sealing portion at a low temperature.

In some embodiments, a cooling pipe 6 is connected to an end of the connection tank 4 far from the slag discharge pipe, ash in the connection tank 4 is discharged through the cooling pipe 6, at least one first nozzle set 61 is disposed inside the cooling pipe 6, and the first nozzle set 61 is used for spraying a cooling material to the ash in the cooling pipe 6. When the first nozzle group 61 is provided in plurality, the plurality of first nozzle groups 61 are arranged vertically along the inner wall of the cooling duct 6 at a certain interval.

Wherein, the cooling material can be cooling water, when needs cooling, spray high pressure atomizing dress cooling water to cooling channel 6 through first nozzle group 61, and injection pressure is 1.5-3 times of 1 internal pressure of sediment pipeline, guarantees the atomizing evenly, and the atomizing cooling water that first nozzle group 61 sprays to get into contacts with the high temperature lime-ash that the dilute phase falls, and the heat transfer, and the cooling water turns into steam in the twinkling of an eye, and steam goes upward to get into in the communicating tank, and the gas discharge mouth through communicating tank upper portion is arranged outward when pressure is high.

In addition, the upper part of the connecting tank 4 is of a cylindrical structure, the lower part of the connecting tank 4 is of a conical structure, the inner diameter of the slag discharge pipeline 1 is 0.15-0.25 times of the inner diameter of the cylindrical structure on the connecting tank 4, so that effective heat exchange is ensured while ash falls smoothly, and if the pipeline is too thick, the ash falls quickly and heat exchange is not timely; if the pipeline is too thin, the ash slag is easy to bridge and block and is not smooth to fall.

The inner diameter of the cooling pipeline 6 is not too thick or too thin, and if the inner diameter is too thick, the ash falling retention time is short, and the ash can not uniformly contact atomized cooling water, so that the heat exchange is not uniform and insufficient; if the ash is too fine, the ash is not smooth to fall and easy to bridge, and the ash is difficult to fall due to high upward gas velocity of steam generated at the lower part.

The cooling duct 6 is lined with a refractory material, and the cooling duct 6 is provided as a cylindrical duct.

In some embodiments, a cold slag tank 7 is connected to one end of the cooling pipeline 6 far away from the cooling tank, and ash in the cooling pipeline 6 is discharged to the cold slag tank 7; the second nozzle groups 71 are symmetrically arranged in the positions, close to the cooling pipeline 6, of the interior of the cold slag tank 7, and the second nozzle groups 71 are used for spraying cooling substances to the ash slag in the cold slag tank 7 and used for carrying out secondary cooling on the falling ash slag.

The second nozzle group 71 is used for spraying high-pressure atomized cooling water into the cold slag tank 7, the spraying pressure is 1.5-3 times of the internal pressure of the cold slag tank 7, the atomization is guaranteed to be uniform, the sprayed cooling water is enabled to be vaporific, the atomization is prevented from being nonuniform, if the cooling water is sprayed in a water form, water and part of ash slag are easily caused to be in contact condensation to cause ash slag to be in a mud shape, and the cold slag tank 7 is prevented from being blocked.

In addition, the atomized cooling water sprayed by the second nozzle group 71 is contacted with the high-temperature ash falling from the dilute phase, heat exchange is carried out, the cooling water is instantly converted into steam, the steam ascends into the communicating tank, and the steam is discharged through the upper gas discharge opening when the pressure is high.

In some embodiments, a slag hopper 8 is connected to an end of the cold slag tank 7 far away from the cooling pipeline 6, ash in the cold slag tank 7 is discharged into the slag hopper 8, a lock hopper 9 is connected to an end of the slag hopper 8 far away from the cold slag tank 7, ash in the slag hopper 8 is discharged into the lock hopper 9, a discharge device 10 is connected between the lock hopper 9 and the differential pressure control pipeline 5, and the discharge device 10 is used for filtering and discharging gas in the lock hopper 9 and the differential pressure control pipeline 5.

Wherein, the slag hopper 8 is a high-pressure slag hopper, the cooled high-pressure ash slag is discharged into the high-pressure slag hopper, and after the high-pressure slag hopper level indicator gives an alarm, the lower valve is opened to discharge the ash slag into the lock hopper 9.

In addition, the lock bucket 9 is a variable pressure lock bucket, after ash is discharged to the variable pressure lock bucket, a valve between the variable pressure lock bucket and the high-pressure slag bucket is cut off, the variable pressure lock bucket is decompressed, pressure relief gas enters the discharge device 10 to be purified and then discharged, and the ash is discharged through a discharge outlet at the lower part.

Embodiments of the present disclosure also provide a gasification system, including: the gasification furnace 100 is provided with a slag discharge port, and the slag inlet is communicated with the slag discharge port.

Wherein, the gasifier 100 is internally provided with a distribution plate 101 with a conical structure, and the bottom of the distribution plate 101 is communicated with the slag discharge pipeline 1, so that ash in the gasifier 100 flows to the slag discharge pipeline 1 through the distribution plate 101. By providing the distribution plate 101 having a tapered structure, ash can be collected at the bottom of the gasification furnace 100 and discharged.

Because the arrangement of the slag discharge regulating and controlling component 2 in the slag discharge device can realize the stable and controllable discharge of the ash slag, the residence time of the ash slag in the gasification furnace 100 can be effectively regulated and controlled, the full conversion of carbon in the ash slag in the gasification furnace 100 is realized, and the lower carbon residue content in the ash slag is ensured. And through the setting of this slag discharging system, effectively supported the long period steady operation of gasifier 100, improved system performance.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. A slag discharge device, comprising:

the slag discharging pipeline (1), the slag discharging pipeline (1) is provided with a slag inlet, and the slag inlet is communicated with a slag outlet of the gasification furnace (100);

arrange sediment regulation and control part (2), arrange sediment regulation and control part (2) and include regulator (21) and drive assembly, regulator (21) are located arrange sediment pipeline (1) inside, just regulator (21) can with form the clearance that is used for supplying the ash and slag whereabouts between the inner wall of sediment pipeline (1), drive assembly is used for driving regulator (21) rotate, in order to adjust the size in clearance.

2. The slag discharge device according to claim 1, characterized in that the driving component comprises a driving member (22) and a connecting shaft (23), the adjuster (21) is connected with the driving member (22) through the connecting shaft (23), and the driving member (22) is used for driving the connecting shaft (23) to rotate, so that the connecting shaft (23) drives the adjuster (21) to rotate.

3. Slag discharge device according to claim 1, characterized in that the regulator (21) comprises a regulating plate whose thickness decreases gradually from its center towards its edges.

4. The slag discharging device according to claim 3, wherein said regulating plate is provided with a plurality of falling holes for said ash to fall.

5. The slag discharge apparatus according to claim 2, further comprising a connection tank (4), the connection tank (4) communicating with the gasification furnace (100) through the slag discharge pipeline (1), ash in the slag discharge pipeline (1) being discharged to the connection tank (4);

the connecting tank is characterized in that a through hole through which the connecting shaft (23) can penetrate out is formed in the tank wall of the connecting tank (4), and a sealing component (24) is arranged between the connecting shaft (23) and the through hole.

6. The slag discharge apparatus according to claim 5, wherein a differential pressure control pipe (5) for controlling a differential pressure between the connection tank (4) and the gasification furnace (100) is connected between the connection tank (4) and the gasification furnace (100).

7. The slag discharge device according to claim 5, characterized in that the upper part of the connection tank (4) is of cylindrical structure, and the inner diameter of the slag discharge pipe (1) is 0.15-0.25 times the inner diameter of the connection tank (4) where it is of cylindrical structure.

8. The slag discharge device according to claim 6, characterized in that a cooling pipeline (6) is connected to one end of the connecting tank (4) far away from the slag discharge pipeline (1), and the ash in the connecting tank (4) is discharged to the cooling pipeline (6);

at least one first nozzle group (61) is arranged inside the cooling pipeline (6), and the first nozzle group (61) is used for spraying cooling substances to ash in the cooling pipeline (6);

and the injection pressure of the first nozzle group (61) for injecting the cooling material is 1.5-3 times of the internal pressure of the cooling pipeline (6).

9. The slag discharge device according to claim 8, wherein when the first nozzle group (61) is provided in plurality, the plurality of first nozzle groups (61) are arranged vertically along the inner wall of the cooling duct (6).

10. The slag discharge device according to claim 8, characterized in that a cold slag tank (7) is connected to one end of the cooling pipeline (6) far away from the connecting tank (4), and ash in the cooling pipeline (6) is discharged to the cold slag tank (7);

a second nozzle group (71) is symmetrically arranged in the position, close to the cooling pipeline (6), of the interior of the cold slag tank (7), and the second nozzle group (71) is used for spraying a cooling substance to ash in the cold slag tank (7);

and the injection pressure of the second nozzle group (71) for injecting the cooling substance is 1.5-3 times of the internal pressure of the cold slag tank (7).

11. The slag discharging device according to claim 10, characterized in that a slag hopper (8) is connected to one end of the cold slag tank (7) far away from the cooling pipeline (6), and ash in the cold slag tank (7) is discharged to the slag hopper (8);

one end of the slag hopper (8) far away from the cold slag tank (7) is connected with a lock hopper (9), and ash in the slag hopper (8) is discharged to the lock hopper (9);

and a discharge device (10) is connected between the lock hopper (9) and the differential pressure control pipeline (5), and the discharge device (10) is used for filtering and discharging gas in the lock hopper (9) and the differential pressure control pipeline (5).

12. A gasification system, comprising: a gasification furnace (100) and the slag discharge apparatus of any one of claims 1 to 11;

the gasification furnace (100) is provided with a slag discharge port, and the slag inlet is communicated with the slag discharge port.

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