A dual-fluidized pulverized coal feeding container and gasifier with large-area plus local strengthening

Abstract

The present invention provides a dual-fluidized pulverized coal feeding container with large-area plus local strengthening and a gasifier, relating to the field of pulverized coal feeding containers. The pulverized coal feeding container includes a container cavity, a pulverized coal pipe, a metal sintered fluidizer, and a radiation source for detecting the material level. The container cavity is provided with a fluidizing gas inlet and a strengthening fluidizing gas inlet. The pulverized coal pipe includes an inclined insertion pipe and an arc transition pipe. The inclined insertion pipe is inserted into the container cavity from the side wall of the container cavity. One end of the arc transition pipe is communicated with the inclined insertion pipe, and the other end is vertically downward to form an inner pipe orifice with a downward opening. The metal sintered fluidizer is arranged in the container cavity and below the inner pipe orifice. The strengthening fluidizing gas inlet is arranged between the inner pipe orifice and the metal sintered fluidizer. The fluidizing gas inlet is arranged at the bottom of the container cavity and communicated with the metal sintered fluidizer. The radiation source is externally installed on the outer surface of the container cavity. This application can effectively avoid the situation of powder robbing and blockage at the inner pipe orifice of the pulverized coal pipe.

Description

Technical Field

[0001] The present invention relates to the field of pulverized coal feeding containers, and more particularly to a dual-fluidized pulverized coal feeding container and a gasifier with large-area and local reinforcement. Background Art

[0002] For a schematic diagram of a traditional middle and lower part discharging pulverized coal feeding container 10, please refer to Figure 1 , the pulverized coal pipeline 1 is connected to the side of the pulverized coal feeding container. To ensure the fluidization effect of the pulverized coal, the lower end of the pulverized coal feeding container is shrunk into a cone. Multiple pulverized coal pipelines 1 in the container vertically extend downward into the necking cone, with a vertical length of 30 - 50 mm extending into the tank, and a fluidization plate 3 is arranged at the bottom to fluidize the pulverized coal at the pulverized coal pipe orifice. At the same time, two layers of support ribs 2 are arranged in the container for the pulverized coal pipeline 1 to prevent the pulverized coal pipeline 1 from breaking or being damaged due to excessive length and abnormal working condition fluctuations. This is exactly the necking part of the cone of the feeding container. Coupled with the installation of a pulverized coal radiation source sleeve 4 in the pulverized coal feeding container (the container has a large diameter and a relatively thick wall, and an external radiation source cannot penetrate through two walls and a wide area of pulverized coal under the premise of safety), and four to six layers of radiation source supports are arranged. Single-layer pulverized coal support uses three or four angle steels or I-beams with relatively high bearing strength to be fixed to the container wall. Especially the support of the lowermost radiation source sleeve 4 is close to the necking part at the bottom of the container, and a radiation source is installed at the end of the radiation source sleeve 4 to measure the lowest material level in the container. This part of the radiation source sleeve 4 also enters the necking cone of the container, resulting in too small a space here and intricate pipeline supports, thus causing the pulverized coal to be prone to bridging and poor feeding; a fluidization plate 3 is arranged at the lowermost end of the pulverized coal feeding container. To ensure the fluidization effect at the concentrated pipe orifice, the fluidization area is set to be small, resulting in too small a separation and storage space for impurities carried from the upstream by the pulverized coal, low ability of the pulverized coal pipe orifice to resist foreign objects and impurities from blocking, and at the same time, the pulverized coal has a weak ability to resist bridging interference, and it is easy to have a situation where each pulverized coal pipeline grabs materials. When serious deviation flow occurs, it not only affects the long-term stable operation of the gasifier, but also affects risks such as stable slagging of the gasifier.

[0003] In view of this, the present application is specifically proposed. Summary of the Invention

[0004] The objectives of the present invention include, for example, providing a dual-fluidized pulverized coal feeding container and a gasifier with large-area and local reinforcement.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a dual-fluidized pulverized coal feeding container with large-area plus local reinforcement, which includes a container cavity, a pulverized coal pipe, a metal sintered fluidizer, and a radiation source for detecting the material level. The lower part of the container cavity is contracted into a cone shape. The container cavity is provided with a fluidizing gas inlet and a strengthened fluidizing gas inlet. The pulverized coal pipe includes an inclined insertion pipe and an arc transition pipe. The inclined insertion pipe is inserted into the container cavity from the side wall of the container cavity. One end of the arc transition pipe is communicated with the inclined insertion pipe, and the other end is vertically downward to form an inner pipe orifice with a downward opening. The metal sintered fluidizer is arranged in the container cavity and below the inner pipe orifice. The strengthened fluidizing gas inlet is arranged between the inner pipe orifice and the metal sintered fluidizer. The fluidizing gas inlet is arranged at the bottom of the container cavity and communicated with the metal sintered fluidizer. The radiation source is externally installed on the outer surface of the container cavity.

[0007] In an optional embodiment, the diameter of the metal sintered fluidizer is 1500 - 2800 mm, and the distance between the installation position of the metal sintered fluidizer and the bottom of the container cavity is 900 - 1500 mm.

[0008] In an optional embodiment, the opening direction of the strengthened fluidizing gas inlet faces the inner pipe orifice of the pulverized coal pipe.

[0009] In an optional embodiment, the dual-fluidized pulverized coal feeding container with large-area plus local reinforcement further includes a uniform distributor for supporting the metal sintered fluidizing gas and uniformly supplying the fluidizing gas. The uniform distributor is arranged below the metal sintered fluidizer. The uniform distributor and the metal sintered fluidizer are connected by multiple groups of flexible support members. The fluidizing gas inlet is communicated with the uniform distributor.

[0010] In an optional embodiment, the uniform distributor is composed of multiple hollow annular pipes with different diameters. The multiple hollow annular pipes are communicated by distribution pipes. Multiple distribution holes are arranged on the distribution pipes. The fluidizing gas inlet is communicated with the hollow annular pipes through pipelines.

[0011] In an optional embodiment, the container cavity is further provided with a distributed supplementary gas inlet, which is arranged below the uniform distributor, and the opening direction of the distributed supplementary gas inlet faces the uniform distributor;

[0012] Preferably, a flow-limiting orifice plate for limiting the flow rate and distributing the gas flow rate is arranged at the distributed supplementary gas inlet;

[0013] Preferably, the ratio of the intake air volume of the fluidizing gas inlet to the intake air volume of the distributed supplementary gas inlet is 4 - 7:1.

[0014] In an alternative embodiment, the dual-fluidized pulverized coal feeding container with large-area plus local strengthening further includes a pressurized fluidizing gas buffer tank. The pressurized fluidizing gas buffer tank is provided with a main gas outlet path and fluidizing gas branch paths, supplementary gas branch paths, strengthening gas branch paths, and container pressure branch paths communicating with the main gas outlet path. The fluidizing gas branch path communicates with the fluidizing gas inlet, the supplementary gas branch path communicates with the distributed supplementary gas inlet, the strengthening gas branch path communicates with the enhanced fluidizing gas inlet, and the container pressure branch path communicates with the top of the container cavity. An outlet pressure regulating valve is provided on the main gas outlet path, and branch regulating valves are provided on the fluidizing gas branch path, the supplementary gas branch path, the strengthening gas branch path, and the container pressure branch path.

[0015] In an alternative embodiment, an unpenetrated mounting hole is formed in the side wall of the container cavity, and the radiation source is installed in the mounting hole.

[0016] Preferably, the wall thickness of the container cavity is greater than 75 mm, and the wall thickness of the container cavity at the position corresponding to the mounting hole thins from the outside to the inside to 30 - 50 mm.

[0017] Preferably, a reinforcing ring is further provided at the position of the container cavity corresponding to the mounting hole.

[0018] Preferably, the number of the radiation sources and the mounting holes is 4 - 8.

[0019] In an alternative embodiment, the bending radius of the arc transition pipe is 40 - 50 times the pipe diameter of the arc transition pipe.

[0020] Preferably, there are multiple pulverized coal pipes which are evenly distributed along the axis of the container cavity, and the distance between the inner pipe orifices of two pulverized coal pipes symmetric about the axis of the container cavity is 1500 - 2200 mm.

[0021] In a second aspect, the present invention provides a gasifier, which includes the dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to any one of the foregoing embodiments.

[0022] The beneficial effects of the embodiments of the present invention include, for example:

[0023] The embodiment of the present invention provides a double-fluidized pulverized coal feeding container with large-area and local strengthening. By improving the pulverized coal pipe, the vertical pipe after the extended inclined pipe and the transition pipe of the traditional pulverized coal pipe is omitted, and the inclined insertion pipe is directly inserted into the container cavity, and then the arc transition pipe is directly set. Through such a setting, the length of the pulverized coal pipe of the present application is significantly reduced, and no other support structures need to be set, providing more space for installing the metal sintering fluidizer below the container cavity. At the same time, the installation position of the radiation source is improved, and the radiation source is installed externally, making the overall space in the container cavity larger. Compared with the installation method of the internal radiation source accessories, pulverized coal pipelines and pipeline support rib plates in the traditional large-area and local-strengthened double-fluidized pulverized coal feeding container with middle and lower part discharging, the present application can avoid too many pipelines and support structures forming a spider web at the container necking, affecting the downward flow of pulverized coal. Further, the size of the metal sintering fluidizer in the present application becomes larger, which can realize fluidization in a larger area, is beneficial to increasing the full separation and storage of impurities carried in the pulverized coal on the metal sintering fluidizer, and completely solves the problem that the upstream pulverized coal carries impurities, resulting in the blockage of the pulverized coal angle valve and then forced shutdown. At the same time, in this embodiment, by strengthening the setting of the fluidizing gas inlet, the local position at the inner pipe orifice can be strengthened. Therefore, in the present application, through the double pulverized coal fluidization method of large area and local strengthening, the situation of powder robbing and blockage at the inner pipe orifice of the pulverized coal pipe can be effectively avoided. The double-fluidized pulverized coal feeding container with large-area and local strengthening provided by the present application has safe and reliable process operation, convenient operation and maintenance, high carbon conversion rate, high online operation rate, and greatly reduced production operation economic cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of a traditional middle and lower part discharging pulverized coal feeding container;

[0026] Figure 2 It is a schematic structural diagram of the double-fluidized pulverized coal feeding container with large-area and local strengthening provided by the embodiment of the present application;

[0027] Figure 3 It is a schematic installation diagram of the radiation source in the double-fluidized pulverized coal feeding container with large-area and local strengthening provided by the embodiment of the present application.

[0028] Icons: 10 - Traditional middle and lower part discharging pulverized coal feeding container; 1 - Pulverized coal pipeline; 2 - Support rib plate; 3 - Fluidization plate; 4 - Radiation source sleeve.

[0029] 100 - Double-fluidized pulverized coal feeding container with large area plus local strengthening; 110 - Container cavity; 111 - Pulverized coal inlet; 112 - Fluidization gas inlet; 113 - Distributed supplementary gas inlet; 114 - Enhanced fluidization gas inlet; 120 - Pulverized coal pipe; 121 - Inclined insertion pipe; 122 - Arc transition pipe; 123 - Inner pipe orifice; 130 - Metal sintered fluidizer; 140 - Uniform distributor; 141 - Flexible support; 142 - Hollow annular pipe; 143 - Distribution pipe; 150 - Radiation source; 151 - Mounting hole; 152 - Reinforcing ring; 160 - Pressurized fluidization gas buffer tank; 161 - Total gas outlet path; 1611 - Outlet pressure regulating valve; 162 - Fluidization gas branch; 1621 - Fluidization gas control valve; 163 - Supplementary gas branch; 1631 - Cut-off valve; 164 - Enhanced gas branch; 1641 - Enhanced gas control valve; 165 - Container pressure branch; 1651 - Pressure regulating valve; 1652 - Discharge valve. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0034] In addition, terms such as "first" and "second" are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0035] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0036] Embodiment

[0037] Please refer to Figure 2 , this embodiment provides a dual-fluidized pulverized coal feeding container 100 with large-area plus local strengthening, which includes a container cavity 110, a pulverized coal pipe 120, a metal sintered fluidizer 130, a uniform distributor 140, a radiation source 150, and a pressurized fluidizing gas buffer tank 160.

[0038] The lower part of the container cavity 110 is shrunk into a cone shape. A pulverized coal inlet 111 is provided at the top of the container cavity 110, and a fluidizing gas inlet 112 is provided at the bottom of the container cavity 110. Pulverized coal enters the container cavity 110 from the top of the container cavity 110 and is fluidized by the fluidizing gas at the bottom. Finally, the fluidized pulverized coal is uniformly discharged from the pulverized coal pipe 120.

[0039] In this embodiment, the existing pulverized coal pipe 120, metal sintering fluidizer 130, and radiation source 150 are improved. The pulverized coal pipe 120 includes an inclined insertion pipe 121 and an arc transition pipe 122. The inclined insertion pipe 121 is inserted into the container cavity 110 from the side wall of the container cavity 110. One end of the arc transition pipe 122 is communicated with the inclined insertion pipe 121, and the other end is vertically downward to form an inner pipe orifice 123 with a downward opening. In this embodiment, the extended inclined pipeline and the vertical pipeline after the transition pipe of the traditional pulverized coal pipe 120 are omitted. The inclined insertion pipe 121 is directly inserted into the container cavity 110, and then the arc transition pipe 122 is directly arranged. The bending radius of the arc transition pipe 122 is 40 - 50 times the pipe diameter of the arc transition pipe 122. Through such a setting, the length of the pulverized coal pipe 120 of this application is significantly reduced. The inner pipe orifice 123 does not need to insert into the bottom of the container cavity 110 like the traditional pulverized coal pipe 120. The inner pipe orifice 123 in this embodiment is located at the upper-middle position of the container cavity 110. At this time, more space is provided for arranging the metal sintering fluidizer 130 below the container cavity 110. Further, since the arc transition pipe 122 in this application has a short length, it can be supported only by the inclined insertion pipe 121, and no other support structures need to be arranged in the container cavity 110. The support rib plates of various pipelines in the traditional design are omitted, completely solving the risks of pulverized coal bridging, blockage, etc. caused by the too small pipe spacing between the pulverized coal pipes 120 in the cone part of the dual-fluidized pulverized coal feeding container 100 with large-area plus local strengthening and the support rib plates and other accessories of each vertical pipe. Further, there are multiple pulverized coal pipes 120 and they are evenly distributed along the axis of the container cavity 110. The distance between the inner pipe orifices 123 of two pulverized coal pipes 120 symmetrically arranged along the axis of the container cavity 110 is 1500 - 2200 mm. The distance between the inner pipe orifices 123 of multiple pulverized coal pipes 120 in this embodiment is 2.9 - 4.2 times larger than that in the traditional design; effectively avoiding the risks of pulverized coal bridging, blockage, etc.

[0040] The metal sintering fluidizer 130 is arranged in the container cavity 110 and below the inner pipe orifice 123. Due to the improvement of the structure of the pulverized coal pipe 120 in this application, the installation space of the metal sintering fluidizer 130 is larger. Therefore, in this embodiment, the diameter of the metal sintering fluidizer 130 is increased. Compared with the diameter of the traditional metal sintering fluidizer 130, it is enlarged by about 2 - 3.1 times, from the traditional 750 - 900 mm to the diameter of the metal sintering fluidizer 130 being 1500 - 2800 mm. The enlarged metal sintering fluidizer 130 can be installed in the middle of the container cavity 110, and the distance between the installation position of the metal sintering fluidizer 130 and the bottom of the container cavity 110 is 900 - 1500 mm. It greatly expands the separation and storage space for impurities carried by the pulverized coal from the upstream, and improves the anti-foreign object and impurity blockage ability of the pulverized coal pipe 120 orifice.

[0041] The uniform distributor 140 is used to support the metal sintering fluidizer 130 and uniformly supply fluidizing gas. The uniform distributor 140 is arranged below the metal sintering fluidizer 130. In this embodiment, since the size of the metal sintering fluidizer 130 is increased, in this embodiment, a plurality of flexible support members 141 are used to connect the uniform distributor 140 and the metal sintering fluidizer 130. The arrangement of the flexible support members 141 can utilize the uniform distributor 140 to play a role in uniformly supporting and evenly stressing the metal sintering fluidizer 130. In addition, the fluidizing gas inlet 112 is communicated with the uniform distributor 140. After the fluidizing gas enters the uniform distributor 140, it is evenly distributed and then enters the metal sintering fluidizer 130, so that the gas supply of the metal sintering fluidizer 130 is evenly distributed.

[0042] Specifically, in this embodiment, the uniform distributor 140 is composed of a plurality of hollow annular tubes 142 with different diameters. The plurality of hollow annular tubes 142 are communicated through distribution tubes 143. A plurality of distribution holes are arranged on the distribution tubes 143. The fluidizing gas inlet 112 is communicated with the hollow annular tubes 142 through a pipeline. The fluidizing gas enters from the fluidizing gas inlet 112 and directly enters the hollow annular tubes 142. The fluidizing gas is evenly distributed to the plurality of hollow annular tubes 142 through the distribution tubes 143 and is evenly discharged from the distribution holes on the distribution tubes 143.

[0043] Since the gas supply of the uniform distributor 140 will be interfered by the flexible support members 141, and at the same time, if there are situations such as blocked distribution holes and gas stealing in the uniform distributor 140, it will cause uneven gas supply to the metal sintering fluidizer 130, which will further affect the pulverized coal fluidization effect. Uneven gas supply will also cause pulverized coal deposition and caking on the metal sintering fluidizer 130. In severe cases, it will cause a decrease in the air permeability of the metal sintering fluidizer 130 and excessive pressure difference, resulting in damage to the metal sintering fluidizer 130.

[0044] In order to avoid the occurrence of the above situations, in this embodiment, a plurality of groups of distribution supplementary gas inlets 113 are also opened on the container cavity 110. The plurality of groups of distribution supplementary gas inlets 113 are arranged below the uniform distributor 140. The opening direction of the distribution supplementary gas inlets 113 faces the uniform distributor 140; a flow limiting orifice plate (not shown in the figure) for limiting the flow and distributing the gas flow is arranged at the distribution supplementary gas inlets 113; preferably, the ratio of the intake air volume of the fluidizing gas inlet 112 to the intake air volume of the distribution supplementary gas inlets 113 is 4-7:1. It can be seen that in this embodiment, the gas supply of the metal sintering fluidizer 130 can be made uniform through a small amount of distribution supplementary gas.

[0045] In addition, a reinforced fluidizing gas inlet 114 is formed on the container cavity 110. The reinforced fluidizing gas inlet 114 is arranged between the inner pipe orifice 123 and the metal sintered fluidizer 130, and the opening direction of the reinforced fluidizing gas inlet 114 faces the inner pipe orifice 123 of the pulverized coal pipe 120. In this embodiment, by providing the reinforced fluidizing gas inlet 114, it is possible to avoid the situation that the fluidization effect at the inner pipe orifices 123 of multiple pulverized coal pipes 120 is inconsistent due to large-area fluidization and the excessive distance between the inner pipe orifices 123 of each pulverized coal pipe 120. The reinforced fluidizing gas inlet 114 in this embodiment can be used as a local precise fluidization facility, and the magnitude of the gas flow rate entering through the reinforced fluidizing gas inlet 114 can be individually controlled according to the speed and density values of each pulverized coal pipe 120 line, so as to ensure the precise control and stable operation of the pulverized coal conveying of the device. In addition, in this application, the number of the reinforced fluidizing gas inlets 114 is the same as and corresponds one by one to the number of the pulverized coal pipes 120, which can better fluidize the pulverized coal at the inner pipe orifices 123 of the pulverized coal pipes 120.

[0046] Please refer to Figure 2 and Figure 3 . The radiation source 150 is used to detect the material level in the container cavity 110. In the traditional design, the radiation source 150 and its accessories are both installed in the container cavity 110, and multiple layers of supports need to be provided, further reducing the original internal space of the cavity. In this embodiment, however, the radiation source 150 is externally installed on the outer surface of the container cavity 110. An unpenetrated mounting hole 151 is formed in the side wall of the container cavity 110, and the radiation source 150 is installed in the mounting hole 151. The wall thickness of the container cavity 110 is greater than 75 mm, and the wall thickness of the container cavity 110 at the position corresponding to the mounting hole 151 is thinned from the outside to the inside to 30 - 50 mm, facilitating the installation of the emitting end and the receiving end of the radiation source 150 and ensuring that the radiation source 150 can penetrate to accurately measure the material level in the dual-fluidized pulverized coal feeder container 100 with large-area plus local strengthening. According to the length of the dual-fluidized pulverized coal feeder container 100 with large-area plus local strengthening, the number of the radiation sources 150 and the mounting holes 151 is generally 4 - 8. To ensure that the strength of the feeder container is not affected by the holes dug, a reinforcing ring 152 is also provided at the position of the container cavity 110 corresponding to the mounting hole 151. The provision of the reinforcing ring 152 can enhance the strength of the container cavity 110 and reduce the impact of the reduction in strength caused by the formation of the mounting hole 151.

[0047] The pressurized fluidizing gas buffer tank 160 is used to supply fluidizing gas to each fluidizing gas branch 162, and can also provide pressure to the top of the container cavity 110 to facilitate material discharging. Specifically, the pressurized fluidizing gas buffer tank 160 is provided with a main gas outlet 161 and fluidizing gas branches 162, make-up gas branches 163, intensifying gas branches 164 and container pressure branches 165 that communicate with the main gas outlet 161. The fluidizing gas branches 162 communicate with the fluidizing gas inlets 112, the make-up gas branches 163 communicate with the distributed make-up gas inlets 113, the intensifying gas branches 164 communicate with the enhanced fluidizing gas inlets 114, and the container pressure branches 165 communicate with the top of the container cavity 110; an outlet pressure regulating valve 1611 is provided on the main gas outlet 161, and branch regulating valves are provided on the fluidizing gas branches 162, make-up gas branches 163, intensifying gas branches 164 and container pressure branches 165. Specifically, in this embodiment, the branch regulating valve on the container pressure branch 165 includes a pressure regulating valve 1651 and a discharge valve 1652. The pressure regulating valve 1651 can control the pressure to be 0.2 - 0.6 MPa higher than the pressure of the dual-fluidized pulverized coal feeder 100 with large-area plus local intensification, so as to be used for the replenishment of the space in the container after the pulverized coal is continuously transported, thereby ensuring the constant pressure of the dual-fluidized pulverized coal feeder 100 with large-area plus local intensification. The discharge valve 1652 is used for discharging the fluidizing and loosening gas after the gasifier abnormally unloads or stops; the branch regulating valve on the fluidizing gas branch 162 is a fluidizing gas control valve 1621, which is mainly used to control the flow rate of the fluidizing gas in the large fluidizing area and adjust the fluidizing gas volume according to the overall pulverized coal conveying situation (i.e., the speed and density of multiple pulverized coal lines); the branch regulating valve on the make-up gas branch 163 is a cut-off valve 1631, which is used to control the opening and closing of the gas on the make-up gas branch 163; the branch regulating valve on the intensifying gas branch 164 is an intensifying gas control valve 1641, which is used to control the size of the intensifying gas.

[0048] The working principle of a dual-fluidized pulverized coal feeding container 100 with large-area plus local strengthening provided in this embodiment is as follows: Pulverized coal is fed from the top of the container cavity 110. The radiation source 150 is externally installed on the outer surface of the container cavity 110, and it can stably penetrate and accurately measure the material level of the container cavity 110. The fluidizing gas enters from the fluidizing gas inlet 112 opened at the bottom of the container cavity 110. The fluidizing gas enters the uniform distributor 140 to achieve uniform distribution and discharge of the fluidizing gas. The fluidizing gas introduced into the metal sintered fluidizer 130 is uniformly distributed and discharged by the uniform distributor 140. According to the uniformity of the fluidizing gas discharged from the uniform distributor 140, the distribution supplementary gas inlet 113 can be opened and closed to enable the distribution supplementary gas inlet 113 to supplement a small amount of fluidizing gas into the container cavity 110, improving the situation where the uneven discharge of the fluidizing gas from the uniform distributor 140 leads to uneven gas supply to the metal sintered fluidizer 130. The fluidizing gas is uniformly discharged from the metal sintered fluidizer 130. At this time, the fluidizing gas contacts the pulverized coal and fluidizes the pulverized coal, and the uniformly distributed and fluidized pulverized coal is discharged from the inner pipe orifice 123 of the pulverized coal pipe 120.

[0049] In addition, the present invention provides a gasifier, which includes the above-mentioned dual-fluidized pulverized coal feeding container 100 with large-area plus local strengthening. The gasifier provided with the dual-fluidized pulverized coal feeding container 100 of this embodiment can operate stably for a long time, and the slagging situation is improved.

[0050] In summary, the embodiment of the present invention provides a dual-fluidized pulverized coal feeding container 100 with large-area and local strengthening. By improving the pulverized coal pipe 120, the vertical pipeline after the extended inclined pipeline and the transition pipe of the traditional pulverized coal pipe 120 is omitted. The inclined insertion pipe 121 is directly inserted into the container cavity 110, and then the arc transition pipe 122 is directly set. Through such a setting, the length of the pulverized coal pipe 120 of the present application is significantly reduced, and no other support structures need to be set, providing more space for installing the metal sintering fluidizer 130 below the container cavity 110. At the same time, the installation position of the radiation source 150 is improved, and the radiation source 150 is installed externally, making the overall space in the container cavity 110 larger. Compared with the installation method of the radiation source 150 accessories, the pulverized coal pipe 120 line and the pipeline support rib plate in the traditional large-area and local-strengthened dual-fluidized pulverized coal feeding container 100 with middle and lower part discharging, the present application can avoid too many pipelines and support structures from forming a spider web at the container necking, affecting the downward flow of pulverized coal. Further, the size of the metal sintering fluidizer 130 in the present application becomes larger, which can achieve fluidization in a larger area, facilitating the full separation and storage of impurities carried in the pulverized coal on the metal sintering fluidizer 130, and thoroughly solving the problem that the upstream pulverized coal carries impurities, resulting in the blockage of the pulverized coal angle valve and then forced shutdown. At the same time, in this embodiment, by strengthening the setting of the fluidizing gas inlet 114, local strengthening of the inner pipe orifice 123 can be achieved. Therefore, in the present application, through the dual pulverized coal fluidization method of large-area and local strengthening, the situation of powder robbing and blockage at the inner pipe orifice 123 of the pulverized coal pipe 120 can be effectively avoided. The dual-fluidized pulverized coal feeding container 100 provided by the present application has safe and reliable process operation, convenient operation and maintenance, high carbon conversion rate, high online operation rate, and greatly reduced production operation economic cost.

[0051] As described above, the above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A dual-fluidized pulverized coal feeding container with large-area plus local strengthening, characterized in that It includes a container cavity, a pulverized coal pipe, a metal sintering fluidizer, and a radiation source for detecting the material level. The lower part of the container cavity is contracted into a cone shape. The container cavity is provided with a fluidizing gas inlet and a strengthened fluidizing gas inlet. The pulverized coal pipe includes an inclined insertion pipe and an arc transition pipe. The inclined insertion pipe is inserted into the container cavity from the side wall of the container cavity. One end of the arc transition pipe is communicated with the inclined insertion pipe, and the other end is vertically downward to form an inner pipe orifice with a downward opening. The metal sintering fluidizer is arranged in the container cavity and below the inner pipe orifice. The strengthened fluidizing gas inlet is arranged between the inner pipe orifice and the metal sintering fluidizer. The fluidizing gas inlet is arranged at the bottom of the container cavity and communicated with the metal sintering fluidizer. The radiation source is externally installed on the outer surface of the container cavity; the dual-fluidizing pulverized coal feeding container with large-area plus local strengthening further includes a uniform distributor for supporting the metal sintering fluidizer and uniformly supplying fluidizing gas. The uniform distributor is arranged below the metal sintering fluidizer. Multiple groups of flexible support members are used to connect between the uniform distributor and the metal sintering fluidizer. The fluidizing gas inlet is communicated with the uniform distributor; the uniform distributor is composed of multiple hollow annular pipes with different diameters. Multiple hollow annular pipes are communicated through distribution pipes. Multiple distribution holes are arranged on the distribution pipes. The fluidizing gas inlet is communicated with the hollow annular pipes through pipelines.

2. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 1, characterized in that The diameter of the metal sintering fluidizer is 1500 - 2800 mm, and the distance between the installation position of the metal sintering fluidizer and the bottom of the container cavity is 900 - 1500 mm.

3. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 1, characterized in that, The opening direction of the strengthened fluidizing gas inlet faces the inner pipe orifice of the pulverized coal pipe.

4. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 1, characterized in that, The container cavity is also provided with a distributed supplementary gas inlet, which is arranged below the uniform distributor, and the opening direction of the distributed supplementary gas inlet faces the uniform distributor.

5. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 4, characterized in that, A choke orifice plate for limiting the flow and distributing the gas flow is arranged at the distributed supplementary gas inlet.

6. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 4, wherein The ratio of the intake air volume of the fluidizing gas inlet to the intake air volume of the distributed supplementary gas inlet is 4 - 7:

1.

7. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 4, characterized in that The dual-fluidizing pulverized coal feeding container with large-area plus local strengthening further includes a pressurized fluidizing gas buffer tank. The pressurized fluidizing gas buffer tank is provided with a total outlet passage and a fluidizing gas branch passage, a supplementary gas branch passage, a strengthened gas branch passage, and a container pressure branch passage communicated with the total outlet passage. The fluidizing gas branch passage is communicated with the fluidizing gas inlet. The supplementary gas branch passage is communicated with the distributed supplementary gas inlet. The strengthened gas branch passage is communicated with the strengthened fluidizing gas inlet. The container pressure branch passage is communicated with the top of the container cavity; an outlet pressure regulating valve is arranged on the total outlet passage, and branch regulating valves are arranged on the fluidizing gas branch passage, the supplementary gas branch passage, the strengthened gas branch passage, and the container pressure branch passage respectively.

8. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to any one of claims 1-7, characterized in that, An unpenetrated mounting hole is provided on the side wall of the container cavity, and the radiation source is installed in the mounting hole.

9. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 8, characterized in that, The wall thickness of the container cavity is greater than 75 mm, and the wall thickness at the position of the container cavity corresponding to the mounting hole thins from the outside to the inside to 30 - 50 mm.

10. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 8, characterized in that, A reinforcing ring is further provided at the position of the container cavity corresponding to the mounting hole.

11. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 8, characterized in that, The number of the radiation sources and the mounting holes is 4 - 8.

12. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to any one of claims 1-7, characterized in that, The bending radius of the arc-shaped transition pipe is 40 - 50 times the pipe diameter of the arc-shaped transition pipe.

13. The dual-fluidized pulverized coal feeding container with large-area plus local strengthening according to claim 12, characterized in that, There are multiple pulverized coal pipes which are evenly distributed along the axis of the container cavity, and the distance between the inner pipe orifices of two pulverized coal pipes symmetric about the axis of the container cavity is 1500 - 2200 mm.

14. A gasifier, characterized in that, It includes a dual-fluidized pulverized coal feeding container with large-area plus local strengthening as described in any one of claims 1 - 13.

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