CN215906155U

CN215906155U - Gasification ash pneumatic conveying system for gasification furnace

Info

Publication number: CN215906155U
Application number: CN202120007983.7U
Authority: CN
Inventors: 陈萍
Original assignee: Kangmeisi Pneumatic Conveying Technology Beijing Co ltd
Current assignee: Kangmeisi Pneumatic Conveying Technology Beijing Co ltd
Priority date: 2021-01-04
Filing date: 2021-01-04
Publication date: 2022-02-25
Anticipated expiration: 2031-01-04

Abstract

The utility model relates to a gasification ash pneumatic conveying system for a gasification furnace, which comprises a hopper, a star-shaped feeder and a buffer bin which are arranged in sequence; the inlet of the star-shaped feeder is communicated with the bottom of the hopper, and the outlet of the star-shaped feeder is communicated with the top of the buffer bin; a sealing layer is arranged in the hopper to limit the gasified materials from overflowing from the inlet of the hopper in the feeding process; an air inlet pipe is fixed on one side of the buffer bin, and a material conveying pipe is fixed on the other side of the buffer bin; the air inlet pipe, the material conveying pipe and the interior of the buffer bin are communicated; compressed air can flow into the buffer bin from the air inlet pipe and flow into the material conveying pipe by wrapping dust in the buffer bin. The star-shaped feeder is used as an ash discharge valve, can effectively prevent coal gas from flowing back, has the function of gas locking, and can remove dust from the coal gas in a high-temperature and high-pressure conveying environment to enable dust to enter the buffer tank. The sealing layer is arranged in the hopper, so that the coal gas can be limited to overflow from the inlet of the hopper in the blanking process, and the operation safety is improved.

Description

Gasification ash pneumatic conveying system for gasification furnace

Technical Field

The utility model relates to the technical field of pneumatic conveying of powdery materials, in particular to a gasification ash pneumatic conveying system for a gasification furnace.

Background

When the coal gas is dedusted in the pneumatic conveying process, the risk caused by coal gas leakage needs to be considered, and especially for high-pressure coal gas, the risk of explosion caused by leakage is extremely high. When the dust removal is carried out on the coal gas, the device is correspondingly sealed only by the existing valve, and the expected sealing effect cannot be achieved. The technology of material pouring and blocking gradually develops. However, the material pouring and blocking technology only aims at the conveying environment aiming at zero pressure or negative pressure, and is not suitable for the conveying environment which bears high pressure (about 4 kilograms) and high temperature (about 300 ℃).

Therefore, how to remove dust from the gas in the high-pressure and high-temperature pneumatic conveying environment on the premise of ensuring that the gas is not leaked is an urgent problem to be solved in the technical field.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gasification ash pneumatic conveying system for a gasification furnace, aiming at solving the problem of removing dust of coal gas in a pneumatic conveying environment with high pressure and high temperature on the premise of ensuring that the coal gas does not leak.

The utility model provides a gasification ash pneumatic conveying system for a gasification furnace, which aims to realize the aim of the utility model and comprises a hopper, a star-shaped feeder and a buffer bin which are arranged in sequence;

the hopper and the buffer bin are of hollow structures; the inlet of the star-shaped feeder is communicated with the bottom of the hopper, and the outlet of the star-shaped feeder is communicated with the top of the buffer bin; the powdery material can flow into the star-shaped feeder from the hopper and then flow into the buffer bin;

a sealing layer is arranged in the hopper to limit the gasified materials from overflowing from the inlet of the hopper in the feeding process;

an air inlet pipe is fixed on one side of the buffer bin, and a material conveying pipe is fixed on the other side of the buffer bin; the air inlet pipe, the material conveying pipe and the interior of the buffer bin are communicated; compressed air can flow into the buffer bin from the air inlet pipe and flow into the material conveying pipe by wrapping dust in the buffer bin.

In one embodiment, the star feeder comprises a drive motor and a hollow shell which are adjacently arranged;

a rotating shaft is arranged in the shell; the side wall of the rotating shaft is fixed with an impeller;

a first mounting hole is formed in one side wall of the shell, and a second mounting hole is formed in the other side wall of the shell; one end of the rotating shaft extends to the outside of the shell through the first mounting hole, and the other end of the rotating shaft extends to the outside of the shell through the second mounting hole;

one end of the rotating shaft is in transmission connection with an output shaft of the driving motor, so that the driving motor can drive the rotating shaft to rotate;

the connecting position of the rotating shaft and the first mounting hole is provided with a first sealing assembly, and the connecting position of the rotating shaft and the second mounting hole is provided with a second sealing assembly.

In one particular embodiment, the first seal assembly includes a bushing, a first lip seal, and a second lip seal;

the shaft sleeve is sleeved on the outer wall of the rotating shaft;

the inner wall of the second lip seal is attached to the middle part of the outer wall of the shaft sleeve, and the outer wall of the second lip seal is fixed on the wall of the first mounting hole;

the inner wall of the first lip seal is attached to the outer wall of the inner end of the shaft sleeve, and the outer wall of the first lip seal is also fixed on the wall of the first mounting hole;

forming an air pressure chamber between the first lip seal and the second lip seal; the shell is provided with a through hole which is communicated with the air pressure chamber.

In one specific embodiment, the device further comprises a feeding pipe and a connecting pipe;

the top of the feeding pipe is communicated with the bottom of the hopper, and the bottom of the feeding pipe is communicated with the inlet of the star-shaped feeder;

the top of the connecting pipe is communicated with the outlet of the star-shaped feeder, and the bottom of the connecting pipe is communicated with the top of the buffer bin;

the bottom of the hopper is provided with a first regulating valve;

and a second regulating valve is arranged at the top of the buffer bin.

In one embodiment, the first regulating valve is an electric rotary valve;

the second regulating valve is a dome valve; the sealing ring of the dome valve is an inflatable sealing ring.

In one embodiment, the sealing layer is a layer of material filled in the bottom of the hopper.

In one embodiment, a level indicator is fixed on the side wall of the hopper;

in the vertical direction, the material level indicator and the material layer are both at preset heights.

In one of the specific embodiments, the top cross-section of the hopper is larger than the bottom cross-section;

the cross section of the top of the buffer bin is larger than that of the bottom of the buffer bin; the air inlet pipe and the material conveying pipe are arranged close to the bottom of the buffer bin.

In one specific embodiment, the device further comprises an air compressor, a filter, a first angle seat valve, a second angle seat valve and a dense phase stabilizer;

the filter is respectively communicated with the air compressor, the first angle seat valve and the second angle seat valve;

the concentrated phase stabilizers are multiple and are uniformly distributed along the extension direction of the feed delivery pipe; each concentrated phase stabilizer is communicated with the second angle seat valve;

the air inlet pipe is communicated with the first angle seat valve.

In one specific embodiment, the device further comprises a pressure transmitter and a pressure gauge;

and the pressure transmitter and the pressure gauge are arranged on a pipeline for communicating the air inlet pipe with the first angle seat valve.

The utility model has the beneficial effects that: the gasification ash pneumatic conveying system for the gasification furnace is provided with the hopper, the star-shaped feeder and the buffer bin. The inlet of the star-shaped feeder is communicated with the bottom of the hopper, the outlet of the star-shaped feeder is communicated with the top of the buffer bin, and the powdery material can flow into the star-shaped feeder from the hopper and then flow into the buffer bin. An air inlet pipe is fixed on one side of the buffer bin, and a material conveying pipe is fixed on the other side of the buffer bin. Compressed air can flow into the buffer bin from the air inlet pipe, and then flows into the material conveying pipe along with dust. The star-shaped feeder is used as an ash discharge valve, can effectively prevent coal gas from flowing back, has the function of gas locking, and can remove dust from the coal gas in a high-temperature and high-pressure conveying environment to enable dust to enter the buffer tank. The sealing layer is arranged in the hopper, so that the coal gas can be limited to overflow from the inlet of the hopper in the blanking process, the coal gas is effectively prevented from leaking, and the operation safety is improved.

Drawings

FIG. 1 is an elevation view of one embodiment of a gasification ash pneumatic conveying system for a gasifier of the present invention;

FIG. 2 is a side view of the gasification ash pneumatic conveying system for the gasifier shown in FIG. 1;

FIG. 3 is a top view of one embodiment of a star feeder of the gasification ash pneumatic conveying system for a gasifier shown in FIG. 1;

FIG. 4 is a cross-sectional view A-A of the star feeder of FIG. 3;

fig. 5 is a partially enlarged view of the region B in fig. 4.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description or for simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "secured," "engaged," "hinged," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1, as an embodiment of the present invention, a gasification ash pneumatic conveying system for a gasification furnace includes a hopper 110, a star feeder 120, and a surge bin 130, which are sequentially disposed. The hopper 110 and the surge bin 130 are hollow structures, the hopper 110 is used for temporarily storing powder materials, and the surge bin 130 is used for temporarily storing dust. The inlet of the star feeder 120 is connected to the bottom of the hopper 110, and the outlet is connected to the top of the surge bin 130, so that the powder material can flow into the star feeder 120 from the hopper 110 and then flow into the surge bin 130. The star feeder 120 is used as an ash discharge valve, which not only can effectively prevent gas backflow and has the function of gas locking, but also can remove dust from the gas in a high-temperature and high-pressure conveying environment, so that dust enters the buffer tank. The sealing layer is arranged in the hopper 110, so that gasified materials (coal gas) can be limited to overflow from the inlet of the hopper 110 in the blanking process, the coal gas is effectively prevented from leaking, and the operation safety is improved. An air inlet pipe 141 is fixed to one side of the surge bin 130, and a feed delivery pipe 142 is fixed to the other side. The air inlet pipe 141, the material conveying pipe 142 and the interior of the buffer bin 130 are communicated. The compressed air generated by the air compressor can flow into the buffer bin 130 through the air inlet pipe 141, and can flow into the material conveying pipe 142 along with the dust in the buffer bin 130. The feed conveyor pipe 142 communicates with a dust collection canister where the dust is eventually collected. On the whole, be applicable to the transport buggy in to the gasifier, can carry the dust removal ash in the pneumatic conveying system of internal pressure more than 0.4 Mpa.

Referring to fig. 1, 2, 3, 4 and 5, in one embodiment of the present invention, the star feeder 120 includes a drive motor 121 and a hollow housing 122 disposed adjacent to each other. A rotating shaft 123 is arranged in the casing 122, and an impeller 124 is fixed on the side wall of the rotating shaft 123. A first mounting hole is formed in one side wall of the housing 122, and a second mounting hole is formed in the other side wall. One end of the rotation shaft 123 extends to the outside of the housing 122 through the first mounting hole, and the other end extends to the outside of the housing 122 through the second mounting hole. One end of the rotating shaft 123 is in transmission connection with an output shaft of the driving motor 121, and specifically, the output shaft may be in transmission connection with the rotating shaft 123 in a form of a chain matching with a gear. Thus, the driving motor 121 can drive the rotating shaft 123 to rotate so as to drive the impeller 124 to rotate, so that the pressurized fluid enters the buffer bin 130 through the star feeder 120. The connecting position of the rotating shaft 123 and the first mounting hole is provided with a first sealing assembly 125, and the connecting position of the rotating shaft 123 and the second mounting hole is provided with a second sealing assembly. The first sealing assembly 125 effectively improves the sealing effect at the connecting position of the rotating shaft 123 and the housing 122 by adopting a combination of mechanical sealing and air sealing, thereby effectively preventing the leakage of pulverized coal and coal gas.

Specifically, first seal assembly 125 includes a bushing 1251, a first lip seal 1252, and a second lip seal 1253. The sleeve 1251 is sleeved on the outer wall of the rotating shaft 123. The inner wall of the second lip seal 1253 fits the middle of the outer wall of the bushing 1251, which is fixed to the wall of the first mounting hole. The inner wall of the first lip seal 1252 fits against the outer wall of the inner end of the sleeve 1251, which is also secured to the wall of the first mounting hole. Here, it should be noted that the inner end of the sleeve 1251 refers to an end of the sleeve 1251 near the middle of the rotating shaft 123. An air pressure chamber is formed between the adjacent ends of the first and

second lip seals

1252 and 1253. A through hole 126 is formed in the housing 122, and the through hole 126 communicates with the air pressure chamber. When the star feeder 120 is operated, gas is continuously supplied into the gas pressure chamber through the through hole 126 to form a sealed gas pressure. Here, when it is necessary to say, the gas forming the sealing gas pressure is supplied from a separate gas source. The sealing air pressure is greater than the air pressure of the first lip seal 1252 on the side (where the pulverized coal flows through) away from the second lip seal 1253, so that the coal gas and the pulverized coal are effectively prevented from entering between the first lip seal 1252 and the second lip seal 1253, namely, the leakage of the pulverized coal and the coal gas is effectively prevented, and the abrasion of the pulverized coal to the shaft sleeve and the second lip seal 1253 is reduced. Moreover, the sealing air pressure is also greater than the air pressure at the side of the second lip seal 1253 away from the first lip seal 1252, so that the second lip seal 1253 is tightly attached to the shaft sleeve, and the possibility of coal dust and coal gas leakage is further reduced. The shaft sleeve is made of high-wear-resistant alloy materials, the first lip seal 1252 and the second lip seal 1253 are made of high-temperature-resistant modified polytetrafluoroethylene materials, the overall sealing effect is good, the high-temperature-resistant modified polytetrafluoroethylene sealing sleeve is suitable for high-temperature and high-pressure environments, and the service life is long. The second sealing element has the same shape and structure as the first sealing element 125, and is not described herein again.

In an embodiment of the present invention, a feed pipe 150 and a connection pipe 160 are further included. Wherein the top of the feeding pipe 150 is connected to the bottom of the hopper 110, and the bottom is connected to the inlet of the star feeder 120. The connecting pipe 160 is a rubber pipe, the top of which is connected to the outlet of the star feeder 120, and the bottom of which is connected to the top of the surge bin 130. The bottom of the hopper 110 is provided with a first adjusting valve 111, and whether the dust falls down is controlled by adjusting the first adjusting valve 111. Here, it should be noted that the first regulating valve 111 is in a continuously open state during pneumatic transmission. Plays a role of isolating during maintenance. The top of the surge bin 130 is provided with a second regulating valve 131. The dust flows through the hopper 110, the first regulating valve 111, the feeding pipe 150, the star feeder 120, the second regulating valve 131, and the surge bin 130 in sequence. The dust introduced into the surge tank 130 is collected into the dust collection tank through the feed pipe 142 by means of the compressed gas. Specifically, the first regulating valve 111 is an electric rotary valve, which facilitates manual operation to control the opening and closing of the first regulating valve 111. The withstand voltage value of the electric rotary valve reaches more than 0.4Mpa, and the electric rotary valve can be used for balancing the pressure exceeding 104Mpa in the pneumatic conveying system so as to prevent coal gas from permeating the material layer to overflow when the material layer is not higher than the preset height. The second control valve 131 is a dome valve, and is manufactured into a unique structure by a unique manufacturing process, and can continuously and stably operate under special working conditions of high abrasion, high temperature, high corrosivity, high viscosity and the like, and the performance is very reliable. The dome valve includes a valve seat, the top and bottom ends of which are both open structures. The inner wall of the valve seat is rotatably connected with a valve clack, and the valve clack can seal the top end opening of the valve seat. Here, the contact surface between the valve seat and the valve flap is formed as a spherical surface, and a clearance of about 1mm is present at the fitting portion. In addition, the connection structure between the valve flap and the valve seat and the driving principle of the valve flap are the prior art, and are not described herein again. When the dome valve is opened, the valve seat is not in direct contact with the valve clack, and abrasion is greatly reduced. The inner wall on the top of disk seat has embedded the sealing ring, and when the top opening of disk seat was sealed to the valve clack, the sealing ring clamp was located between disk seat and the valve clack. Specifically, the sealing ring is an inflatable sealing ring (similar to a life buoy structure) and is made of elastic rubber materials. The inside of the sealing ring is communicated with the air supply device. When the dome valve needs to be closed, the air supply device inflates the sealing ring, the sealing ring gradually expands and is tightly attached to the valve clack, and the purpose of sealing is achieved. When the dome valve needs to be opened, the gas in the sealing ring is released into the air, and the sealing ring gradually contracts, so that the valve clack is effectively prevented from being abraded with the sealing ring in the moving process. Because of high abrasion resistance, high temperature resistance, corrosion resistance and non-sticky property, the pneumatic conveying device can continuously and stably run in the pneumatic conveying process of dust-containing gas and erosive bulk materials. The sealing ring is used as the only abrasion part and is convenient to replace, so that the service life of the dome valve is greatly prolonged.

In a specific embodiment of the present invention, the sealing layer is a material layer filled at the bottom of the hopper 110, which can effectively prevent the leakage of high-pressure gas, without the need of any additional auxiliary devices, and simplifies the structure of the hopper 110. Meanwhile, the raw materials are used for sealing, so that the sealing method is convenient and does not introduce impurities. Correspondingly, a level gauge 112 (intermediate level gauge) is fixed to the side wall of the hopper 110 (tapered hopper of the dust collector). In the vertical direction, the level gauge 112 and the material layer are both at a predetermined height. The level gauge 112 (mesolevel gauge) is capable of monitoring and communicating the height of the material layer to ensure that the height of the material layer is constant at all times. Specifically, the preset height is 2-3 m, which can play a role of sealing, and can effectively prevent the gas in the pneumatic conveying device (dust remover) from overflowing from the top opening of the hopper 110 (the tapered hopper of the dust remover). The hopper 110 has a large top cross-section to facilitate the addition of the powder material into the hopper 110 and a small bottom cross-section to facilitate the collection of the powder material into the outlet of the hopper 110. The top cross section of the surge bin 130 is larger to facilitate dust to enter the surge bin 130, and the bottom cross section is smaller to facilitate dust to gather at the bottom of the surge bin 130. The air inlet pipe 141 and the material conveying pipe 142 are both disposed near the bottom of the surge bin 130, so that compressed air can entrain dust into the material conveying pipe 142.

Referring to fig. 1 and 2, in one embodiment of the utility model, the pneumatic conveying apparatus further comprises an air compressor, a filter 170, a first angular seat valve 181, a second angular seat valve 182, and a dense phase stabilizer 190. The filter 170 is respectively connected to the air compressor, the first angle seat valve 181, and the second angle seat valve 182. Here, it should be noted that the filter 170 has a Y-shaped structure, and has one inlet and two outlets. The air compressor is capable of compressing air into a compressed gas that flows into the filter 170 through an inlet thereof, into the first angled seat valve 181 through one of the outlets, and into the second angled seat valve 182 through the other outlet. Wherein, the first angle seat valve 181 is communicated with the intake pipe 141. The first angular seat valve 181 can automatically control whether the compressed gas flows into the intake pipe 141. The second angle seat valve 182 is connected to the feeding pipe 142, and the first angle seat valve 181 can automatically control whether the compressed gas flows into the feeding pipe 142. Specifically, there are a plurality of concentrated phase stabilizers 190 uniformly distributed along the extension direction of the feed delivery pipe 142, and each concentrated phase stabilizer 190 on the feed delivery pipe 142 is communicated with the second angle valve. So that the pressure at each position in the conveying pipe 142 is relatively balanced, stable conveying of dust is ensured, and the local blockage phenomenon is effectively avoided. The pneumatic conveying device further comprises a pressure transmitter and a pressure gauge, and the pressure transmitter and the pressure gauge are both arranged on a pipeline for communicating the air inlet pipe 141 and the first angle seat valve 181. For monitoring the pressure in the line connecting the inlet line 141 and the first angle seat valve 181. Moreover, compared with the traditional way of carrying dust by compressed gas, the dust cannot flow back into the surge bin 130 from the conveying pipe 142, and the conveying efficiency is improved. It should be noted that all the above electric devices are powered by the distribution box, all the electric devices are electrically connected to the programmable controller, and the programmable controller controls whether the electric devices work or not. The process and principle of the programmable controller for controlling the operation of the electric device are the prior art, and are not described herein again.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," "one specific embodiment," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the scope of the present invention by equivalent replacement or change according to the technical solution and the inventive concept of the present invention within the scope of the present disclosure.

Claims

1. A gasification ash pneumatic conveying system for a gasifier, comprising:

the hopper, the star-shaped feeder and the buffer bin are arranged in sequence;

the hopper and the buffer bin are of hollow structures; the inlet of the star-shaped feeder is communicated with the bottom of the hopper, and the outlet of the star-shaped feeder is communicated with the top of the buffer bin; the powdery material can flow into the buffering bin after flowing into the star-shaped feeder from the hopper;

a sealing layer is arranged in the hopper to limit the gasified material from overflowing from the inlet of the hopper in the feeding process;

an air inlet pipe is fixed on one side of the buffer bin, and a material conveying pipe is fixed on the other side of the buffer bin; the air inlet pipe, the material conveying pipe and the interior of the buffer bin are communicated; compressed air can flow into the buffer bin from the air inlet pipe, and the compressed air wraps up dust in the buffer bin and flows into the material conveying pipe.

2. The gasification ash pneumatic conveying system for gasification furnaces as claimed in claim 1, wherein the star feeder comprises a driving motor and a hollow-structured housing which are adjacently disposed;

a rotating shaft is arranged in the shell; an impeller is fixed on the side wall of the rotating shaft;

the rotating shaft is provided with a first sealing assembly at the connecting position of the first mounting hole, and a second sealing assembly at the connecting position of the second mounting hole.

3. The gasification ash pneumatic conveying system for a gasifier as claimed in claim 2, wherein said first seal assembly comprises a shaft sleeve, a first lip seal and a second lip seal;

the shaft sleeve is sleeved on the outer wall of the rotating shaft;

the inner wall of the second lip seal is attached to the middle of the outer wall of the shaft sleeve, and the outer wall of the second lip seal is fixed on the wall of the first mounting hole;

forming an air pressure chamber between the first lip seal and the second lip seal; the shell is provided with a through hole, and the through hole is communicated with the air pressure chamber.

4. The gasification ash pneumatic conveying system for a gasification furnace according to claim 1, further comprising a feeding pipe and a connecting pipe;

the bottom of the hopper is provided with a first regulating valve;

and a second regulating valve is arranged at the top of the buffer bin.

5. The gasification ash pneumatic conveying system for a gasification furnace according to claim 4, wherein the first regulating valve is an electric rotary valve;

6. The gasification ash pneumatic conveying system for a gasification furnace according to claim 4, wherein the sealing layer is a material layer filled at the bottom of the hopper.

7. The gasification ash pneumatic conveying system for a gasification furnace according to claim 6, wherein a level gauge is fixed on a side wall of the hopper;

8. The gasification ash pneumatic conveying system for a gasifier as claimed in claim 1, wherein a top cross-section of the hopper is larger than a bottom cross-section;

the cross section of the top of the buffer bin is larger than that of the bottom of the buffer bin; the air inlet pipe and the material conveying pipe are both close to the bottom of the buffer bin.

9. The gasification ash pneumatic conveying system for a gasification furnace according to claim 1, further comprising an air compressor, a filter, a first angle seat valve, a second angle seat valve and a dense phase stabilizer;

the concentrated phase stabilizers are multiple and are uniformly distributed along the extension direction of the conveying pipeline; each concentrated phase stabilizer is communicated with the second angle seat valve;

the air inlet pipe is communicated with the first angle seat valve.

10. The gasification ash pneumatic conveying system for gasification furnaces according to claim 9, further comprising a pressure transmitter and a pressure gauge;

the pressure transmitter and the pressure gauge are both arranged on a pipeline for communicating the air inlet pipe with the first angle seat valve.