Pressurized discharging device

Abstract

The present invention relates to the field of feed technology for coal powder gasification, and specifically to a pressurized discharge device and a method for stable feeding of a pulverized coal gasifier, comprising: a shell, at least one feed port, a pressurized gas feed pipe and at least one discharge port, wherein a rotating shaft, a first fluidizing plate and a second fluidizing plate are arranged in the shell; the first fluidizing plate and the second fluidizing plate are respectively provided with through holes for fluidizing gas to pass through; the first fluidizing plate and the second fluidizing plate are respectively connected to the lower part and the upper part of the rotating shaft; the first fluidizing plate is close to the pressurized gas feed pipe, and is used to allow pressurized gas to pass through the first fluidizing plate and flow to the second fluidizing plate; the second fluidizing plate is close to at least one discharge port, and is used to allow the fluidized material to be discharged smoothly. The pressurized discharge device of the present invention has a self-fluidizing function, and can pressurize the stacked powder to a certain pressure and discharge it smoothly, while ensuring the stability of the discharge device.

Description

Technical Field

[0001] The invention relates to the technical field of feed materials for pulverized coal gasification, and in particular to a pressurized discharge device. Background Art

[0002] Pulverized coal gasification is a typical form of gasification technology. Since the gasification pressure of pulverized coal gasification reaches above 4MPa, it is particularly important to pressurize the ground coal powder to above 4MPa, generally between 4MPa-8MPa, and smoothly transport it to the gasifier. It is also one of the key steps to ensure the safe and stable operation of the gasifier.

[0003] The particle size of pulverized coal used in pulverized coal gasification is generally less than 2mm. This pulverized coal is susceptible to compression or compaction. Pressurizing pulverized coal from atmospheric pressure to pressures above 4MPa can easily cause this compression or compaction. Therefore, ensuring that the pulverized coal does not compress or compact during the pressurization process to the required pressure within the gasifier and ensuring smooth pulverized coal transportation is a crucial challenge in pulverized coal gasification and a key focus for researchers.

[0004] Especially as coal gasification gradually develops towards large-scale, there are a large number of feed tanks with multiple feed pipe legs. For example, the gasifier of the existing Shenhua Ningxia Coal's 4 million tons / year coal indirect liquefaction project has 4 feed pipe legs at the bottom of a feed tank. If the fluidization is uneven, it will easily lead to inconsistent pressure inside each feed pipe leg, and further lead to inconsistent flow rate of coal powder transported by each feed pipe leg. Ultimately, there will be differences in the solid material flow rate of the burner connected to each feed pipe leg, which will lead to uneven burning of the multi-nozzle gasifier, further seriously affecting the life of the gasifier and the burner.

[0005] However, in the pressurized discharge device in the prior art, since the material is powder and is easily compressed or compacted, pressurizing the container will further increase the possibility of the powder being compressed or compacted in the container, which will seriously affect the smooth discharge of the powder. At the same time, it will cause unstable airflow in the device. The uneven fluidization of the powder in the device will affect the pressure in the connected gasifier, and thus affect the gasification effect of the coal powder. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problem in the prior art that powder is not discharged smoothly after being pressurized in a container, or the defect that the powder cannot be pressurized in order to ensure smooth discharge of the material, that is, to ensure the fluidization of the powder. A pressurized discharge device is provided, which can pressurize the powder in the container while ensuring that the pressurized material has the characteristics of fluidization, thereby facilitating its smooth discharge from the container after pressurization.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a pressurized discharging device, comprising: a shell, at least one feed port, a pressurized gas feed pipe and at least one discharge port, wherein a rotating shaft, a first fluidizing plate and a second fluidizing plate are arranged in the shell; the first fluidizing plate and the second fluidizing plate are respectively provided with through holes for fluidizing gas to pass through; the first fluidizing plate and the second fluidizing plate are respectively connected to the lower part and the upper part of the rotating shaft; the first fluidizing plate is close to the pressurized gas feed pipe, and is used to allow pressurized gas to pass through the first fluidizing plate and flow to the second fluidizing plate; the second fluidizing plate is close to at least one discharge port, and is used to allow the fluidized material to be discharged smoothly.

[0008] Preferably, the discharge port is provided on the side of the shell and is located below the second fluidizing plate;

[0009] And / or, there are multiple discharge ports, and the multiple discharge ports are located on the same horizontal plane;

[0010] Alternatively, the feed inlets may be multiple and disposed on the side and top of the housing, with the feed inlets disposed on the side of the housing being located at different levels. This preferred embodiment of the present invention is more suitable for pulverized coal gasification, and is particularly capable of fully fluidizing the easily compacted area below the second fluidizing plate during pulverized coal gasification.

[0011] Preferably, the pressurized discharge device further includes at least one fluidizing gas inlet, located on one end of the housing near the second fluidizing plate. Under this preferred embodiment, the second fluidizing plate provides forced mechanical agitation and disturbance of the pulverized coal in the easily compacted area, strictly preventing accumulation of pulverized coal at the top of the device. Furthermore, the fluidizing gas from the fluidizing gas inlet provides reverse purge and further pressurization, significantly increasing the fluidization of the pulverized coal in the easily compacted area while further ensuring the required pressure, thereby ensuring stable operation of pressurized coal conveying.

[0012] Preferably, the pressurized discharge device further includes a pressurized gas feed port and a fluidizing gas feed port disposed on the housing. The pressurized gas feed port is located near and above the first fluidizing plate to facilitate pressurization of the powder; the fluidizing gas feed port is located near and below the second fluidizing plate to facilitate fluidization of the material. This preferred embodiment further facilitates convection between the pressurized and fluidizing gases, promoting the overall pressurization and fluidization effects, and enabling smoother discharge of the pressurized material.

[0013] The inventors of the present invention have discovered that after the pulverized coal gasification discharge device is pressurized, an area where the powder is easily compressed or compacted (hereinafter referred to as the easy-to-compact area) will be formed in the area above the pressurized area near the discharge port, making discharge difficult; further research has found that by setting a second fluidizing plate for mechanical stirring to promote fluidization in the easy-to-compact area near the discharge port, and setting a first fluidizing plate in the pressurized area near the pressurized gas feed pipe, the effects of uniform pressurization, uniform fluidization, and smooth discharge of the pressurized powder can be achieved, while ensuring the stability of the discharge device.

[0014] Through the above technical solution, the pressurized discharging device of the present invention has a self-fluidizing function, and can pressurize the stacked powder to a certain pressure and discharge it smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0016] Figure 2 yes Figure 1 A schematic diagram of a specific embodiment of the first fluidizing plate;

[0017] Figure 3 yes Figure 1 Schematic diagram of a specific embodiment of the second fluidizing plate.

[0018] Description of Reference Numerals

[0019] DETAILED DESCRIPTION

[0020] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0021] In the present invention, unless otherwise indicated, directional terms such as "upper (or above) and lower (or below)" generally refer to the upstream or downstream of the material flow direction (i.e., the upper, lower, or above, below the corresponding components shown in the figures). "Inside" and "outside" refer to the inside and outside of the contour of the corresponding component.

[0022] The first aspect of the present invention provides a pressurized discharging device, comprising: a shell 1, at least one feed port 11, a pressurized gas feed pipe 3 and at least one discharge port 9, wherein a rotating shaft 6, a first fluidizing plate 7 and a second fluidizing plate 8 are arranged in the shell 1; the first fluidizing plate 7 and the second fluidizing plate 8 are respectively provided with through holes for the fluidizing gas to pass through; the first fluidizing plate 7 and the second fluidizing plate 8 are respectively connected to the lower and upper parts of the rotating shaft 6; the first fluidizing plate 7 is close to the pressurized gas feed pipe 3, and is used to allow the pressurized gas to pass through the first fluidizing plate 7 and flow to the second fluidizing plate 8; the second fluidizing plate 8 is close to at least one discharge port 9, and is used to allow the material after fluidization in the easy-to-compact area 102 to be discharged smoothly.

[0023] In the present invention, a pressurized area and a fluidized area are formed between the first fluidizing plate 7 and the second fluidizing plate 8. The first fluidizing plate 7 divides the high-pressure gas from the pressurized gas feed pipe 3 to form dispersed pressurized gas 101. This not only achieves relatively uniform pressurization of the powder, preventing localized strong pressurization that may cause compression or compaction of the powder, but also ensures the stability of the device. The pressurized gas also serves as the driving source for the first fluidizing plate 7 (i.e., driving the first fluidizing plate 7 to rotate), promoting fluidization in the pressurized area. Furthermore, the second fluidizing plate 8 with through holes simultaneously fluidizes the material in the easily compacted area 102, thereby promoting the fluidization of the material in the easily compacted area 102. Combined with mechanical forced fluidization, this ensures the fluidization of all powders within the sealed container, ensuring that the powders achieve self-fluidization while being pressurized, meeting the requirements of downstream equipment, such as smooth material discharge while meeting the feed pressure requirements of the gasifier.

[0024] According to the present invention, the first fluidizing plate 7 can be fixed on the rotating shaft 6, or can be movably connected (e.g., rotatably connected, for example, rotatably connected via a rotating bearing) to the rotating shaft 6. Preferably, the first fluidizing plate 7 includes at least two unit plates fixedly connected to the rotating shaft 6, for example, four unit plates, such as Figure 2 This preferred solution is more conducive to the fluidization of the powder in the easily compacted area 102 .

[0025] In the present invention, the unit plate can be in the form of a flat plate or a curved surface, and those skilled in the art can freely choose according to actual needs, preferably in the form of a flat plate. It is understood that each unit plate is provided with a plurality of through holes.

[0026] Preferably, the at least two unit plates form a circle along the circumferential direction of the rotating shaft 6 (it can be understood that there is basically no gap between the multiple unit plates in this circumferential direction), so that almost all the powder is piled in the sealed space above the first fluidizing plate 7.

[0027] Preferably, if Figure 2 As shown, the unit plate is fan-shaped.

[0028] In the present invention, the at least two unit plates may be located on the same horizontal plane, or they may be located at different levels (i.e., at different heights), with the latter being preferred. The preferred embodiment of the present invention wherein the at least two unit plates are located at different levels can further promote fluidization while achieving pressurization. Under this embodiment, those skilled in the art can choose whether to leave gaps (understandably, vertical gaps) between two adjacent unit plates based on actual needs. If gaps are not required, the adjacent unit plates can be connected by vertical plates.

[0029] It is understood that the radial dimension (i.e., the dimension in the horizontal direction) of the unit plate is preferably slightly smaller than the inner diameter of the housing 1, so that most of the powder is located on the upper part of the first fluidizing plate 7. Since the pressurized gas in the present invention causes the powder to flow upward, a very small amount of powder may flow downward.

[0030] According to the present invention, preferably, the second fluidizing plate 8 includes at least two blades fixedly connected to the rotating shaft 6. Further preferably, the at least two blades are evenly arranged along the circumferential direction of the rotating shaft 6, such as Figure 3 More preferably, there are three blades, and the angle between adjacent blades in the circumferential direction is 120°. It is understood that each blade is covered with through holes to ensure that when the second fluidizing plate 8 rotates, the fluidizing gas above or below the second fluidizing plate 8 can pass through the second fluidizing plate 8, thereby forming a convection purge, thereby further promoting the fluidization of the material in the easily compacted area 102.

[0031] In the present invention, the at least two blades may be located at the same horizontal plane, or at least partially at different horizontal planes (i.e., at different heights). Preferably, the at least two blades are not located at the same horizontal plane. This preferred embodiment further enhances the mechanical agitation effect, thereby achieving a better fluidization effect and better dispersion and pressurization.

[0032] Preferably, in the horizontal direction, the through-holes on the first fluidizing plate 7 account for 85-95% of the total area of ​​the first fluidizing plate 7, and the through-holes on the second fluidizing plate 8 account for 85-95% of the total area of ​​the second fluidizing plate 8. This preferred embodiment is more conducive to pressurized fluidization of the raw material powder.

[0033] In the present invention, the through holes on the first fluidizing plate 7 and the second fluidizing plate 8 can be independently arranged in a regular pattern (such as a lattice or matrix) or irregular pattern, and those skilled in the art can adjust the arrangement according to the fluidization conditions.

[0034] The present invention provides a wide range of apertures for the through-holes in the first and second fluidizing plates 7, 8. Those skilled in the art can freely select an aperture based on actual needs, as long as it facilitates pressurized fluidization of the raw material powder. Preferably, the apertures in the through-holes in the first and second fluidizing plates 7, 8 are both equal to the median particle size of the raw material powder.

[0035] According to the present invention, preferably, Figure 1 As shown, the discharge port 9 is arranged on the side of the shell 1, more preferably on the upper side of the shell 1, and more preferably below the second fluidizing plate 8 to facilitate the fluidization of the powder in the easily compacted area. In the present invention, when the discharge port 9 is located on the upper side of the shell 1, it is called the upper side discharge method. It can be understood that the feed port 11, the pressurized air feed pipe 3 and the discharge port 9, as well as the rotating shaft 6, the first fluidizing plate 7 and the second fluidizing plate 8 in the present invention can all be arranged in reverse (that is, Figure 1 The corresponding components are shown inverted, for example, the first fluidizing plate 7 and the second fluidizing plate 8 are located above and below the rotating shaft 6, respectively, and the discharge port 9 is located on the lower side of the housing 1. This is referred to as a bottom-side discharge method, and those skilled in the art can freely choose the method based on actual needs. The discharge method of the present invention makes the pressurized discharge device more suitable for delivering pulverized coal to various gasifiers during coal gasification.

[0036] The inventors have discovered that conventional pressurized discharge devices typically rely primarily on gravity to discharge material from below (i.e., discharge material from directly below the device). This method, where the weight of the material controls the stability of the entire discharge, falls under the category of dense-phase conveying (i.e., the proportion of solids is significantly greater than the proportion of gas), posing significant challenges to ensuring stable system operation. Currently, no stable solids flowmeter has been found, and this conventional method is not conducive to stable material delivery to the gasifier. The discharge method employed in the present invention, however, falls under the category of dilute-phase conveying, where material delivery is primarily controlled by fluidization of the gas-solid two-phase flow, i.e., gas control (the gas overcomes the weight of the solids, rendering the solid particles similar to a fluid). This method can be effectively implemented, thereby ensuring stable operation of the system. For coal chemical plants, stable and safe system operation is crucial, and the device of the present invention is particularly suitable for feeding coal chemical plants.

[0037] In the present invention, preferably, there are multiple discharge ports 9, and the multiple discharge ports 9 are located in the same horizontal plane. It can be understood that the multiple discharge ports 9 are distributed along the circumferential direction of the shell 1; so as to realize simultaneous feeding of multiple downstream equipment (such as a gasifier).

[0038] According to the present invention, the feed port 11 can be located on the side of the housing 1 or on the top of the housing 1 (this preferred solution facilitates the entry of powder into the pressurized and fluidized area by its own weight). Alternatively, multiple feed ports 11 can be provided, each located on the side and top of the housing 1. The specific location can be determined based on the overall process system. Preferably, at least some of the feed ports 11 located on the side of the housing 1 are located at different levels to facilitate timely replenishment based on the material level in each area, ensuring continuous and stable operation of the entire system.

[0039] According to a preferred embodiment of the present invention, the pressurized discharge device further includes at least one fluidizing gas inlet 10, which is disposed on the housing 1 at one end near the second fluidizing plate 8 and is configured to allow fluidizing gas to flow through the second fluidizing plate 8 toward the easily compacted region 102. Under this preferred embodiment, on the one hand, the second fluidizing plate 8 forcibly mechanically agitates and disturbs the pulverized coal in the easily compacted region 102, strictly preventing the accumulation of pulverized coal at the top of the device. On the other hand, the fluidizing gas from the fluidizing gas inlet 10 is used for reverse purge and further pressurization, thereby significantly increasing the fluidization of the pulverized coal in the easily compacted region 102 while ensuring that the pressure inside the device cavity is increased to the pressure value (e.g., 4.5 MPa) required by downstream equipment (e.g., a gasifier), thereby ensuring stable operation of pressurized coal conveying.

[0040] Preferably, at least two fluidizing gas inlets 10 are evenly arranged along the circumferential direction of the central axis of the shell 1 (which is understandably coaxial with the rotating axis 6 ).

[0041] In the present invention, the rotating shaft 6 is driven to rotate by a driving mechanism, and the optional range of the driving mechanism is relatively wide. Preferably, the pressurized discharging device further includes an air motor 5 connected to the rotating shaft 6. In this preferred embodiment, the rotating shaft 6 is driven by the air motor 5. It can be understood that the air motor 5 is connected to the driving source air inlet pipe 4. The air source required by the air motor 5 can come from the same air inlet pipe 2 as the pressurized gas required by the pressurized air feed pipe 3, and the exhaust gas of the air motor 5 can be recycled for other areas requiring fluidization or pressurization.

[0042] Preferably, the pneumatic motor 5 is connected to at least one fluidizing gas inlet 10 through a fluidizing gas main pipeline, so that the exhaust gas of the pneumatic motor 5 can be used as fluidizing gas.

[0043] According to the present invention, the pressurized discharge device preferably further includes a backup gas source pipeline 14 connected to the fluidizing gas main pipeline, and the backup gas source pipeline 14 is connected to a backup gas supply unit. This preferred embodiment facilitates replenishing fluidizing gas when the exhaust gas from the pneumatic motor 5 is insufficient to provide the fluidizing gas flow rate required by the fluidizing gas inlet 10.

[0044] In the present invention, it is preferred to set the gas flow rate Q at the fluidizing gas inlet 10 to t Satisfaction: Q t =Q t1 +Q b2 , where Q b2 is the exhaust flow rate of the pneumatic motor 5, Q t1 is the gas flow rate in the backup gas source pipeline 14; it can ensure that the powder material is discharged smoothly while meeting the pressure increase.

[0045] In the present invention, it is preferred to set the gas-solid flow rate Q at the discharge port 9 v Satisfaction: Q v =Q 总 +Q 粉 , Q 总 =Q b1 +Q b2 +Q t1 Among them, Q 粉 is the flow rate of the powder in the pressurized discharge device, Q 总 is the gas flow rate in the pressurized discharge device, Q b1 is the pressurized gas flow rate in the pressurized gas feed pipe 3, Q b2 The gas flow rate required to drive the pneumatic motor 5, Q t1 is the gas flow rate in the backup gas source pipeline 14; it can ensure that the powder material is discharged smoothly while meeting the pressure increase.

[0046] According to a preferred embodiment of the present invention, the pressurized discharge device further includes a pressurized gas side feed port 12 and a fluidizing gas side feed port 13 provided on the housing 1. The pressurized gas side feed port 12 and the fluidizing gas side feed port 13 can be arranged at multiple locations in the upper and lower regions of the housing 1, or evenly distributed in the circumferential direction of the housing 1.

[0047] Preferably, the pressurized gas side feed port 12 is close to the first fluidizing plate 7 and is located above the first fluidizing plate 7 to promote powder pressurization; the fluidizing gas side feed port 13 is close to the second fluidizing plate 8 and is located below the second fluidizing plate 8 to promote material fluidization. Under this preferred embodiment, it is more conducive to promoting the convection of pressurized gas and fluidizing gas (the convection direction is as follows: Figure 1 The pressurized material is fed into the container (as shown by the arrow in the middle) to promote the overall effect of pressurization and fluidization, so that the pressurized material can be discharged more smoothly.

[0048] In a preferred embodiment, the number of the pressurized gas side feed inlets 12 and the fluidizing gas side feed inlets 13 are both even numbers.

[0049] In another preferred embodiment, the number of the pressurized gas side feed inlets 12 and the fluidizing gas side feed inlets 13 is independently 3-5, more preferably 4. This preferred solution is more conducive to the fluidization of the powder.

[0050] Preferably, the pressurized gas side feed inlet 12 and the fluidizing gas side feed inlet 13 are evenly distributed along the circumferential direction of the shell 1 .

[0051] In the present invention, it is understood that each gas inlet (such as the fluidizing gas inlet 10, the pressurized gas side feed inlet 12, and the fluidizing gas side feed inlet 13) is connected to a corresponding pipeline. Those skilled in the art can select the pipeline according to actual needs. A regulating valve and a monitoring device are installed on the gas inlet pipe 2, the pressurized gas feed pipe 3, and the driving source gas inlet pipe 4 to control the flow rate, pressure and other process parameters of each gas pipeline. The gas inlet pipe 2 is connected to the high-pressure gas (the gas flow rate is Q b , understandably, Q b =Q b1 +Q b2 ), such as CO2, N2 or other inert gases, and then divided into two, part of which enters the pressurized gas feed pipe 3 as pressurized gas, and part of which enters the driving source intake pipe 4 as a driving gas source.

[0052] The external interfaces of the pressurized discharging device provided by the present invention (such as the feed port 11, the pressurized gas feed pipe 3 and the discharge port 9) are all static interfaces. When docking with other equipment, there is only a static-static device interface, and there is no dynamic-static sealing contact surface. The static-static device interface can be completely sealed by using a conventional welding solution.

[0053] In the present invention, those skilled in the art may also install internal air pressure detection devices P1 and P2 and temperature detection devices T1 and T2 at the bottom and top of the device, as needed. These devices dynamically adjust the flow rate and pressure of the pressurized airflow and the flow rate and pressure of the fluidizing airflow to ensure that the pressure of the gas-solid mixture at the fluidization outlet meets the process requirements for properly transporting the fluidized powder to downstream equipment (e.g., a gasifier). The air pressure detection device and the air source adjustment device within the entire device operate in a closed-loop control system, achieving real-time, coordinated adjustments and ensuring stable system operation.

[0054] In the present invention, the feeding of the powder and the introduction of the pressurized gas or fluidizing gas can be carried out simultaneously or separately, and those skilled in the art can freely choose according to actual needs.

[0055] According to a preferred embodiment of the present invention, the pressurized discharging device is as follows Figure 1As shown, when in use, high-pressure gas is transported to the pressurized gas feed pipe 3 and the driving source air inlet pipe 4 through the air inlet pipe 2, and the high-pressure gas from the pressurized gas feed pipe 3 flows upward through the through holes of the first fluidizing plate 7 to form pressurized gas 101. The high-pressure gas from the driving source air inlet pipe 4 drives the rotating shaft 6 to rotate through the pneumatic motor 5, thereby driving the second fluidizing plate 8 to rotate. The first fluidizing plate 7 is driven to rotate by the high-pressure gas or the rotating shaft 6; at the same time, the exhaust gas of the pneumatic motor 5 is drawn out as fluidizing gas and enters the top of the shell 1 through the fluidizing gas inlet 10 to form fluidizing gas, which enters the easily compacted area; at the same time, powder is introduced through the feed port 11; at the same time, auxiliary pressurized gas and auxiliary fluidizing gas are introduced through the pressurized gas side feed port 12 and the fluidizing gas side feed port 13. The powder is pressurized in the presence of the pressurized gas 101 and the pressurized gas from the side air intake, and is fluidized under the forced stirring of the first fluidizing plate 7 and the second fluidizing plate 8, as well as in the presence of the fluidizing gas from the fluidizing gas inlet 10 and the fluidizing gas from the side air intake. This can completely prevent the powder from being compressed or compacted, and achieve smooth feeding.

[0056] In the preferred embodiment of the present invention, the above-mentioned specific discharging method is adopted, and a fluidization scheme of mechanical + gas fluidization is adopted at the same time. At the same time, the airflow of the pneumatic motor is coordinated and the exhaust gas of the pneumatic motor is further utilized as fluidizing gas, which increases the utilization efficiency of the system gas volume, reduces the operating cost of the entire device, and ensures the stable operation of the system.

[0057] According to a specific embodiment of the present invention, when the pressurized discharge device is used, Figure 1 As shown, powder is loaded through the feed ports 11 on the top and side; at the same time, a driving air source is introduced from the driving source air inlet pipe 4 to drive the pneumatic motor 5 to rotate the rotating shaft 6, and the first fluidizing plate 7 and the second fluidizing plate 8 (in the horizontal direction, the through-hole area accounts for 90% of the area of ​​the corresponding fluidizing plate, and the through-hole aperture is the median particle size of the powder) rotate with the rotating shaft 6. At the same time, pressurized air is introduced from the pressurized air feed pipe 3 to the bottom of the first fluidizing plate 7, and the pressurized air passes through the through-holes of the first fluidizing plate 7 to pressurize the powder in the shell 1. At the same time, the side pressurized air from the pressurized air side feed port 12 assists in pressurizing the powder, and the powder moves upward after being pressurized. Simultaneously, the exhaust from the pneumatic motor 5 and the backup air from the backup air source pipeline 14 are introduced into the fluidizing gas inlet 10, whereupon the fluidizing gas enters the housing 1, forming fluidizing gas at the top of the second fluidizing plate 8. This fluidizing gas passes through the second fluidizing plate 8, fluidizing the powder in the easily compacted area. Side fluidizing gas from the fluidizing gas side inlet 13 forms fluidizing gas on the sides of the second fluidizing plate 8. After being fluidized by the fluidizing gas, the powder in the housing 1 flows smoothly out of the discharge port 9 and into the gasifier.

[0058] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A pressurized discharging device comprising: A shell (1), at least one feed port (11), a pressurized gas feed pipe (3) and at least one discharge port (9), characterized in that a rotating shaft (6), a first fluidizing plate (7) and a second fluidizing plate (8) are arranged in the shell (1); the first fluidizing plate (7) and the second fluidizing plate (8) are respectively provided with through holes for fluidizing gas to pass through; the first fluidizing plate (7) and the second fluidizing plate (8) are respectively connected to the lower part and the upper part of the rotating shaft (6); the first fluidizing plate (7) is close to the pressurized gas feed pipe (3) for allowing the pressurized gas to pass through the first fluidizing plate (7) and flow to the second fluidizing plate (8); the second fluidizing plate (8) is close to at least one discharge port (9); the first fluidizing plate (7) includes at least two unit plates fixedly connected to the rotating shaft (6), and the at least two unit plates of the first fluidizing plate (7) The components are not in the same horizontal plane; the second fluidizing plate (8) includes at least two blades fixedly connected to the rotating shaft (6), and the at least two blades are evenly arranged along the circumferential direction of the rotating shaft (6), and the at least two blades of the second fluidizing plate (8) are not in the same horizontal plane; the pressurized discharge device also includes at least one fluidizing gas inlet (10), and the at least one fluidizing gas inlet (10) is arranged on the shell (1) near one end of the second fluidizing plate (8); the pressurized discharge device also includes a pressurized gas side feed port (12) and a fluidizing gas side feed port (13) arranged on the shell (1), the pressurized gas side feed port (12) is close to the first fluidizing plate (7) and is located above the first fluidizing plate (7); the fluidizing gas side feed port (13) is close to the second fluidizing plate (8) and is located below the second fluidizing plate (8).

2. The pressurized discharge device according to claim 1, characterized in that: In the horizontal direction, the area of ​​the through holes on the first fluidizing plate (7) accounts for 85-95% of the total area of ​​the first fluidizing plate (7), and the area of ​​the through holes on the second fluidizing plate (8) accounts for 85-95% of the total area of ​​the second fluidizing plate (8).

3. The pressurized discharge device according to claim 2, characterized in that: The apertures of the through holes on the first fluidizing plate (7) and the second fluidizing plate (8) are both equal to the median particle size of the raw material powder.

4. The pressurized discharge device according to claim 1, characterized in that: The discharge port (9) is arranged on the side of the shell (1) and is located below the second fluidizing plate (8); And / or, there are multiple discharge ports (9), and the multiple discharge ports (9) are located on the same horizontal plane; And / or, the feed inlets (11) are multiple and are respectively arranged on the side and top of the shell (1), and the feed inlets (11) arranged on the side of the shell (1) are respectively located at different horizontal planes.

5. The pressurized discharge device according to claim 1, characterized in that: The pressurized discharge device further comprises an air motor (5) connected to the rotating shaft (6), wherein the air motor (5) is connected to at least one fluidizing gas inlet (10) via a fluidizing gas main pipeline so that the exhaust gas of the air motor (5) is used as fluidizing gas.

6. The pressurized discharge device according to claim 5, characterized in that: The pressurized discharge device further comprises a backup gas source pipeline (14) in communication with the fluidizing gas main pipeline, and the backup gas source pipeline (14) is connected to a backup gas source supply unit.

7. The pressurized discharge device according to claim 6, characterized in that: Set the gas flow rate Q at the fluidizing gas inlet (10) t Satisfaction: Q t =Q t1 +Q b2 , where Q b2 is the exhaust flow rate of the pneumatic motor (5), Q t1 is the gas flow rate in the backup gas source pipeline (14).

8. The pressurized discharge device according to claim 6 or 7, characterized in that: Set the gas-solid flow rate Q at the discharge port (9) v Satisfaction: Q v =Q 总 +Q 粉 , Q 总 =Q b1 +Q b2 +Q t1 ; Among them, Q 粉 is the flow rate of the powder in the pressurized discharge device, Q 总 is the gas flow rate in the pressurized discharge device, Q b1 is the flow rate of pressurized gas in the pressurized gas feed pipe (3), Q b2 The gas flow rate required to drive the pneumatic motor (5), Q t1 is the gas flow rate in the backup gas source pipeline (14).

9. The pressurized discharge device according to claim 1, characterized in that: The number of the pressurized gas side feed inlets (12) and the fluidizing gas side feed inlets (13) are both even numbers; and / or, the number of the pressurized gas side feed inlet (12) and the fluidizing gas side feed inlet (13) is independently 3-5; And / or, the pressurized gas side feed port (12) and the fluidizing gas side feed port (13) are evenly distributed along the circumferential direction of the shell (1).

10. The pressurized discharge device according to claim 9, characterized in that: The number of the pressurized gas side feed inlet (12) and the fluidizing gas side feed inlet (13) is independently 4.

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