CN211711631U - Pulverized coal feeding tank and pulverized coal conveying system - Google Patents

Abstract

The utility model provides a fine coal feed jar, include: the side outlet is communicated with the side wall of the lower cone, and the side outlets are uniformly and annularly arranged along the circumferential direction of the lower cone; the upper end of the ventilation cone is communicated with the lower cone body; the bottom outlet is communicated with the lower end of the ventilation cone. The utility model has the advantages that the side wall of the lower cone body of the feeding tank is provided with the side part outlet, the material is conveyed in a side part discharging mode, the side part discharging is more stable in flow during the side part discharging compared with the upper part discharging and the bottom discharging, and the discharging stability is improved; simultaneously, through setting up the bottom export and carrying out the supplementary ejection of compact, when improving feed jar ejection of compact stability, still greatly improved discharging efficiency.

Description

Pulverized coal feeding tank and pulverized coal conveying system

Technical Field

The utility model relates to a fine coal gasification technical field particularly, relates to a fine coal feed jar and fine coal conveying system.

Background

At present, high-pressure pulverized coal conveying is one of core processes of a pulverized coal gasification technology, main equipment comprises a filter, a low-pressure storage tank, a locking hopper, a feeding tank and the like, wherein the feeding tank is core equipment for high-pressure pulverized coal conveying, and pulverized coal conveyed by the feeding tank directly enters a gasification furnace through a pulverized coal burner. Therefore, the stability of the discharge of the feeding tank directly determines whether the pulverized coal gasification furnace can operate stably.

The existing charging bucket mainly has two discharging modes of upper discharging and bottom discharging, a GSP (GSP) gasification furnace and a two-section type pulverized coal gasification furnace adopt the upper discharging mode, and pulverized coal gasification furnaces such as a shell furnace, an aerospace furnace and the like adopt the bottom discharging mode. But the upper discharging mode has the defects of low solid-gas ratio (mass) and unstable conveying under high pressure; the risk of the conical bottom bridge of the feeding tank exists by adopting a bottom discharging mode, and the conveying stability is influenced.

Disclosure of Invention

In view of this, the utility model provides a fine coal feed jar and fine coal conveying system aims at solving the problem that improves feed jar ejection of compact stability.

In one aspect, the utility model provides a fine coal feed jar, include: a side outlet, a bottom outlet and a ventilation cone which are communicated with the lower cone of the feeding tank, wherein,

the side outlets are communicated with the side wall of the lower cone, and the side outlets are uniformly and annularly arranged along the circumferential direction of the lower cone;

the upper end of the ventilation cone is communicated with the lower cone body;

the bottom outlet is communicated with the lower end of the ventilation cone.

Further, the fine coal feed tank further comprises: and the main pipeline is respectively communicated with the side outlets and the bottom outlet and is used for collecting the materials in the bottom outlet and the side outlets.

Further, the main pipeline is communicated with the gasification furnace through a flow meter.

Further, the side outlet is arranged in a downward inclined mode along the horizontal direction, and a preset included angle is kept between the central axis of the side outlet and the central axis of the feeding tank body.

Further, an included angle between a central axis of the side outlet and a central axis of the feeding tank body is smaller than or equal to 40 degrees.

Further, a plurality of the side outlets are symmetrically arranged on the lower cone.

Further, a purge gas pipeline is arranged on the side outlet and used for inputting purge gas into the side outlet.

Furthermore, the side outlet comprises a reducing pipe and an outlet pipe, one end of the reducing pipe is communicated with the lower cone, and the other end of the reducing pipe is communicated with the outlet pipe.

Further, the purge gas pipeline is communicated with the reducing pipe.

On the other hand, the utility model also provides a fine coal conveying system, a serial communication port, include: the device comprises a filter, a low-pressure storage tank, a lock hopper, a feeding tank, a blanking device and a flowmeter, wherein the feeding tank comprises the pulverized coal feeding tank.

Compared with the prior art, the utility model has the advantages that the side wall of the lower cone body of the feeding tank is provided with the side part outlet, the material is conveyed in a side part discharging mode, the side part discharging is more stable in flow during the side part discharging compared with the upper part discharging and the bottom discharging, and the discharging stability is improved; simultaneously, through setting up the bottom export and carrying out the supplementary ejection of compact, when improving feed jar ejection of compact stability, still greatly improved discharging efficiency. The utility model has the advantages that at least:

firstly, during lateral discharging, the lateral outlet is still positioned in a dense phase region, but compared with bottom discharging, the solid content is lower, the fluidization state is better, and the bridging phenomenon can not occur;

secondly, when the material is discharged from the side part, the influence of the material level, the pressure and the flow of the inert gas is small;

and thirdly, during lateral discharging, the discharging at the bottom is taken as auxiliary discharging, so that the discharging rate is improved, meanwhile, large particles are prevented from being accumulated at the bottom in a large amount, and the stability of the flow is ensured.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a front view of a pulverized coal feed tank according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at P;

fig. 3 is a side outlet structure diagram of the feed tank according to the embodiment of the present invention;

fig. 4 is a distribution diagram of the inner region of the feeding tank according to the embodiment of the present invention;

fig. 5 is a flow chart of high-pressure pulverized coal transportation provided by the embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1, the present embodiment discloses a pulverized coal feed tank, including: the side outlet 4-02, the bottom outlet 4-04 and the ventilating cone 4-03 are respectively communicated with the lower cone 4-07 of the feed tank, wherein the side outlet 4-02 is communicated with the side wall of the lower cone 4-07, and the side outlets 4-02 are uniformly and annularly arranged along the circumferential direction of the lower cone 4-07; the upper end of the ventilation cone 4-03 is communicated with the lower cone 4-07; the bottom outlet 4-04 is communicated with the lower end of the aeration cone 4-03, i.e. the bottom outlet 4-04 is communicated with the lower cone 4-07 through the aeration cone 4-03.

Specifically, the lower cone 4-07 is arranged at the lower part of the feeding tank, is communicated with the feeding tank and has an inverted cone structure. One side of the bottom of the lower cone 4-07 is communicated with the feeding tank body 4-01, and the top of the lower cone 4-07 is communicated with the ventilating cone 4-03. The central axis of the lower cone 4-07 is coincident with the central axis of the feeding tank body 4-01. Meanwhile, when the lower cone 4-07 is communicated with the ventilating cone 4-03, the central axis of the lower cone 4-07 is superposed with the central axis of the ventilating cone 4-03, namely, the lower cone 4-07, the ventilating cone 4-03 and the feeding tank body 4-01 are of a coaxial structure, so that materials in the feeding tank can be conveniently and rapidly conveyed into the ventilating cone 4-03, and the material conveying efficiency is improved.

Specifically, the vent cone 4-03 is an inverted cone structure, that is, the vent cone 4-03 is a hollow structure for passing the material output from the feed tank.

Preferably, the aeration cone 4-03 is made of porous stainless steel material and is positioned at the lower end of the aeration cone 4-03 to be used as a gas distribution element so as to ensure that the materials are in a fluidized state. It is understood that the structure and use of vent cones 4-03 will be well known to those skilled in the art.

Specifically, the cone bottom end of the ventilating cone 4-03 with the inverted cone structure is communicated with the lower cone 4-07 of the feed tank, and the cone top end of the ventilating cone 4-03 is communicated with the bottom outlet 4-04. The material in the feeding tank enters the ventilating cone 4-03 through the lower cone 4-07, then is subjected to bottom outlet 4-04 through the ventilating cone 4-03, and is discharged through the bottom outlet 4-04.

It will be appreciated that the bottom outlet 4-04 is located at the lowermost end of the vent cone 4-03, with the bottom outlet 4-04 being disposed in a vertical orientation.

Preferably, the vent cone 4-03 and the lower cone 4-07 can be welded, clamped or screwed together, and a sealing arrangement is provided at the joint of the two to prevent leakage at the joint of the two.

Specifically, the bottom outlet 4-04 is disposed in a vertical direction, i.e., the bottom outlet 4-04 is disposed along the central axis of the feed tank body 4-01. The bottom outlet 4-04 and the central axis of the ventilating cone 4-03 are also coincided, namely, the bottom outlet 4-04, the ventilating cone 4-03, the lower cone 4-07 and the feeding tank body 4-01 are of a coaxial structure.

Specifically, the upper end of the bottom outlet 4-04 is communicated with the lower end of the aeration cone 4-03, and the lower end of the bottom outlet 4-04 is communicated with the gasification furnace, so that the material output from the feeding tank is conveyed into the gasification furnace.

Specifically, the bottom outlet 4-04 and the vent cone 4-03 may be welded, snapped or threaded together and a seal may be provided at the junction to prevent leakage at the junction.

In detail, as shown in fig. 2, the side outlet 4-02 is disposed at an upper portion of the lower cone 4-07, that is, the side outlet 4-02 is disposed near a junction of the lower cone 4-07 and the feeding tank body 4-01, and a predetermined interval is maintained between the side outlet 4-02 and the feeding tank to secure structural strength of the feeding tank body 4-01.

Preferably, the distance L between the side outlet 4-02 and the lower side edge of the feed tank body 4-01 is greater than or equal to 20 cm.

Specifically, the side outlet 4-02 is disposed on an outer sidewall of the lower cone 4-07 and maintains a predetermined angle with the outer sidewall of the lower cone 4-07. Specifically, the side outlet 4-02 is arranged to be inclined downwards along the horizontal direction, that is, the side outlet 4-02 is arranged to be inclined from the side wall direction of the lower cone 4-07 to the cone bottom direction of the lower cone 4-07, and a preset included angle is kept between the side outlet 4-02 and the cone bottom of the lower cone 4-07. It can also be understood that a preset included angle is kept between the central axis of the side outlet 4-02 and the central axis of the lower cone 4-07, that is, a preset included angle is kept between the central axis of the side outlet 4-02 and the central axis of the feeding tank body 4-01.

Referring to fig. 1, in detail, the central axis a of the feeding tank body 4-01 is arranged in a vertical direction, the central axis b of the side outlet 4-02 is arranged in a horizontal direction in a downward inclination manner, and when the side outlet 4-02 is arranged, the central axis b of the side outlet 4-02 intersects with the central axis a of the feeding tank body 4-01, and an included angle α of a preset angle is maintained between the central axis b of the side outlet 4-02 and the central axis a of the feeding tank body 4-01.

Specifically, an included angle α between a central axis b of the side outlet 4-02 and a central axis a of the feeding tank body 4-01 is less than or equal to 40 °, and preferably, the included angle α between the central axis b of the side outlet 4-02 and the central axis a of the feeding tank body 4-01 ranges from 15 ° to 30 °.

It can be seen that the included angle alpha is arranged between the central axis b of the side outlet 4-02 and the central axis a of the feeding tank body 4-01, so that the flowability of the material is effectively improved.

Specifically, a plurality of side outlets 4-02 are provided, each of the plurality of side outlets 4-02 is provided at an upper position of the outer side wall of the lower cone 4-07, and the plurality of side outlets 4-02 are arranged in an annular shape uniform in the circumferential direction of the lower cone 4-07, so that the material can be discharged through the plurality of side outlets 4-02, thereby effectively improving the efficiency of material conveyance in the feed tank body 4-01, and improving the work efficiency.

In particular, the side outlets 4-02 are symmetrically arranged on the lower cone 4-07, i.e. when the side outlets 4-02 are arranged, they are symmetrically arranged.

Specifically, the number of the side outlets 4-02 may be odd or even, when the number of the side outlets 4-02 is odd, the side outlets 4-02 only need to be uniformly and annularly arranged on the lower cone 4-07, and when the number of the side outlets 4-02 is even, the even number of the side outlets 4-02 are symmetrically arranged, and those skilled in the art should understand how to symmetrically arrange the even number of the side outlets 4-02, which is not described herein.

Preferably, an even number of side outlets 4-02 are provided.

Preferably, 4 side outlets 4-02 are provided.

Specifically, the side wall of the lower cone 4-07 is provided with a plurality of through holes, and the through holes are arranged opposite to the side outlets 4-02, that is, each side outlet 4-02 is communicated with one through hole, so that the side outlets 4-02 are communicated with the lower cone 4-07. Specifically, the connection position of the side outlet 4-02 and the through hole is sealed so as to prevent the material leakage at the connection position of the side outlet and the through hole. The side outlet 4-02 and the through hole may be welded, snapped or screwed together.

Preferably, the through-hole may be circular, and accordingly, the cross-sectional shape of the side outlet 4-02 is also circular. It will be appreciated that the through-holes are arranged opposite to the cross-sectional shape of the side outlets 4-02, and the specific shape may be arranged as the case may be.

It can be seen that the side outlet 4-02 is arranged on the side wall of the lower cone 4-07 of the feeding tank, the material is conveyed in a side discharging mode, and compared with the upper discharging mode and the bottom discharging mode, the side discharging mode has the advantages that the flow is more stable during the side discharging, and the discharging stability is improved; meanwhile, the bottom outlets 4-04 are arranged for auxiliary discharging, so that the discharging stability of the feeding tank is improved, and the discharging efficiency is greatly improved.

Continuing to refer to fig. 1, specifically, the pulverized coal feeding tank further comprises a main pipeline 4-05, one end of the main pipeline 4-05 is respectively communicated with the side outlet 4-02 and the bottom outlet 4-04, the main pipeline 4-05 is used for collecting the materials in the bottom outlet 4-04 and each side outlet 4-02, the other end of the main pipeline 4-05 is communicated with the gasification furnace, so that the materials output from the bottom outlet 4-04 and each side outlet 4-02 are collected together, and the collected materials are conveyed to the gasification furnace.

Specifically, the main pipeline 4-05 is communicated with the gasification furnace through a flow meter, namely, the flow meter is arranged between the main pipeline 4-05 and the gasification furnace, and the flow value of the material in the main pipeline 4-05 is displayed through the flow meter. I.e. it is also understood that the flow meter is arranged on the main conduit 4-05.

Specifically, the main pipe 4-05 is disposed at the lower side of the feed tank body 4-01, and the side outlet 4-02, the bottom outlet 4-04, and the vent cone 4-03 are disposed between the feed tank and the main pipe 4-05. The side outlet 4-02 and the bottom outlet 4-04 are respectively communicated with the main pipeline 4-05 through the connecting pipeline 4-06, and materials in the side outlet 4-02 and the bottom outlet 4-04 enter the main pipeline 4-05 through the connecting pipeline 4-06.

It is understood that the main pipe 4-05 is only required to be able to collect the materials in the side outlet 4-02 and the bottom outlet 4-04 and input the materials to the gasification furnace, and the specific structure, i.e. the arrangement mode, should be known to those skilled in the art, and is not limited herein.

Specifically, a plurality of side outlets 4-02 are symmetrically distributed and then are converged on a main pipe 4-05, and it can be seen that even if the air cone 4-03 is damaged and deflected, the flow rate of the materials converged in the main pipe 4-05 is relatively stable. Meanwhile, if the outlet 4-02 on any side is blocked, normal operation of the burner and the gasifier can be ensured by increasing or decreasing the load in time.

Referring to FIG. 3, specifically, a purge gas pipeline 4-02-04 is arranged on the side outlet 4-02, the side outlet 4-02 is communicated with the purge gas pipeline 4-02-04, and the purge gas pipeline 4-02-04 is used for inputting purge gas into the side outlet 4-02. It can be understood that the material transport efficiency of the side outlet 4-02 and the operation stability thereof are improved by providing the purge gas pipe 4-02-04 to introduce the purge gas into the side outlet 4-02 so as to prevent the material from being retained in the side outlet 4-02 and affecting the material transported by the side outlet 4-02 after the side outlet 4-02 is clogged, by providing the purge gas pipe 4-02-04.

Specifically, the side outlet 4-02 comprises a reducing pipe 4-02-03 and an outlet pipe 4-02-02, one end of the reducing pipe 4-02-03 is communicated with the lower cone 4-07, and the other end of the reducing pipe 4-02-02 is communicated with the outlet pipe 4-02-02. One end of the outlet pipeline 4-02-02 is communicated with the reducing pipeline 4-02-03, and the other end is communicated with the gasification furnace.

Specifically, the outlet pipeline 4-02-02 is communicated with the gasification furnace through a connecting pipeline 4-06.

Specifically, the purge gas pipeline 4-02-04 is arranged on the reducing pipe 4-02-03, namely, the purge gas pipeline 4-02-04 is communicated with the reducing pipe 4-02-03. An included angle of a preset angle is kept between the purge gas pipeline 4-02-04 and the reducing pipeline 4-02-03, the included angle between the purge gas pipeline 4-02-04 and the reducing pipeline is set according to actual conditions, and only the condition that the material in the side outlet 4-02 can be purged is met.

Specifically, a first opening end 4-02-01 of the reducing pipe 4-02-03 is connected with a lower cone 4-07, a second opening end is connected with an outlet pipeline 4-02-02, the diameter D1 of the first opening end 4-02-01 is larger than that of the second opening end, and the diameter D1 of the first opening end 4-02-01 is the same as that of a through hole of the lower cone 4-07; the diameter of the second open end is the same as the diameter D2 of the outlet conduit 4-02-02.

Preferably, the ratio of the diameter D1 of the first opening end 4-02-01 to the diameter D2 of the outlet pipe 4-02-02 is 1.5-2, namely D1: d2 is c, wherein the value range of c is 1.5-2.

Specifically, the purge gas pipeline 4-02-04 is arranged on the side wall of the reducing pipe 4-02-03, and the purge gas pipeline 4-02-04 is arranged to prevent blockage caused by retention of materials at the bottom of the reducing pipe 4-02-03. At least one purge gas conduit 4-02-04 is provided.

Specifically, the purge gas pipeline 4-02-04 is obliquely arranged from the second opening end of the reducing pipe 4-02-03 to the first opening end 4-02-01 of the reducing pipe 4-02-03, and a preset angle is kept between the purge gas pipeline 4-02-04 and the plane where the first opening end 4-02-01 of the reducing pipe 4-02-03 is located.

Preferably, the purge gas introduced into the purge gas pipeline 4-02-04 is inert gas, and the continuous gas inlet in the purge gas pipeline 4-02-04 is ensured.

Preferably, the outlet ducts 4-02-02 are symmetrically distributed and then converge into a main duct 4-05, it being possible to see that the material flow after convergence in the main duct 4-05 is relatively stable even if the drift occurs due to the damage of the aeration cone 4-03. Meanwhile, if any outlet pipeline 4-02-02 is blocked, normal operation of the burner and the gasifier can be ensured by increasing or decreasing the load in time.

In another preferred embodiment based on the above embodiment, as shown in fig. 4 and 5, the present embodiment provides a pulverized coal conveying system, including: a filter 1, a low-pressure storage tank 2, a lock hopper 3, a feed tank 4, a downer 5 and a flowmeter 6, wherein the feed tank 4 is a pulverized coal feed tank as in the above embodiment.

Specifically, the filter 1 is communicated with a low-pressure storage tank 2 through a feeder 5, the low-pressure storage tank 2 is communicated with a feeding tank 4 through a lock hopper 3, and the feeding tank 4 is communicated with the gasification furnace through a flowmeter 6.

Preferably, the lock bucket 3 comprises a first lock bucket unit 3-1 and a second lock bucket unit 3-2, the first lock bucket unit 3-1 and the second lock bucket unit 3-2 are arranged side by side, and the first lock bucket unit 3-1 and the second lock bucket unit 3-2 are arranged between the low-pressure storage tank 2 and the feed tank 4.

Preferably, the first and second lock hopper units 3-1 and 3-2 are disposed between the low pressure tank 2 and the feed tank 4 in parallel.

Specifically, the feeding tank 4 of the pulverized coal conveying system adopts a side discharging mode as a main mode and a bottom discharging mode as an auxiliary mode. The defect of unstable discharging during the discharging of the upper part and the discharging of the single bottom is avoided.

Specifically, under the action of the inert gas, the pulverized coal in the feed tank 4 is in a fluidized state, and can be roughly divided into a dense-phase zone B and a dilute-phase zone a from bottom to top, and the solid content of the feed tank 4 is gradually reduced from bottom to top, and the particle size of particles is gradually reduced.

It can be understood that the existing mode of adopting the upper discharging mode has the following problems: firstly, larger particles cannot flow out along with inert gas, and only can be retained in a dense-phase zone B at the bottom layer and accumulated continuously; secondly, as the pressure of the inert gas is not fixed, the pressure can fluctuate sharply in a short time along with the operation of the system, particularly in the process of charging and discharging the lock hopper 3, so that the flow of the pulverized coal is very unstable; thirdly, the vent cone 4-03 belongs to a vulnerable part, and when part of the vent cone is damaged or blocked, inert gas can bias or cut off in the feed tank 4, so that the flow of pulverized coal is unstable.

Further, the existing bottom discharging mode adopted also has the following problems: firstly, as the discharging position is positioned at the bottommost part of the dense-phase zone B, the solid content at the discharging position is the largest, and when the water content of the pulverized coal is higher or the part of the ventilation cone 4-03 is damaged, the pulverized coal is likely to be bridged, so that the pulverized coal cutoff phenomenon is caused; secondly, the material level in the feeding tank 4 is changed periodically, and the flow rate of the pulverized coal also changes periodically to different degrees along with the continuous change of the material level.

It can be seen that this fine coal conveying system carries out the material through the mode that adopts the lateral part ejection of compact, compares in upper portion ejection of compact and bottom ejection of compact, and the flow is more stable. Meanwhile, the pulverized coal conveying system of the embodiment at least has the following advantages:

the positions of the first side outlet 4-02 are still in the dense phase region B, compared with a bottom discharging mode, the solid content is lower, the fluidization state is better, and the bridging phenomenon can not occur;

secondly, the influence of the material level, the pressure and the flow of the inert gas is small;

thirdly, through adopting the lateral part ejection of compact to be main, the mode of bottom ejection of compact as assisting, avoided great granule to gather in a large number in the bottom, also guaranteed the stability of flow more.

Specifically, the working flow of the pulverized coal conveying system is as follows:

qualified pulverized coal enters a low-pressure storage tank 2, the low-pressure carbon dioxide carries the pulverized coal to enter a locking hopper 3, the locking hopper 3 is boosted through the high-pressure carbon dioxide, then the high-pressure carbon dioxide carries the pulverized coal to enter a feeding tank 4, and the pulverized coal is uninterruptedly conveyed into a gasification furnace through a flowmeter 6 through a side outlet 4-02 of the feeding tank 4.

Particularly, under the normal condition, through the particle size distribution of fine coal granule and the calculation of settling velocity, it once to need open bottom blowing mode in every half a month to tentatively set for feed tank 4, prevents the large granule gathering. Similarly, considering that bridging is easy to occur when the bottom of the lock hopper 3 is discharged, a side discharging mode of the lock hopper 3 is also adopted.

Specifically, the low-pressure carbon dioxide has a temperature of 80-140 deg.C and a pressure of 0.7-2.0 MPa.

Specifically, the pressure of the high-pressure carbon dioxide is 7.0-11MPa, and the temperature is 100-170 ℃.

In specific implementation, the specific flow of the pulverized coal conveying system is

1) Low pressure tank 2 feed

The pulverized coal comes from two paths: one path is that qualified pulverized coal carried by low-pressure carbon dioxide enters a low-pressure storage tank 2; the other path is a small amount of pulverized coal filtered by the filter 1 and sent into a low-pressure storage tank 2 through a blanking device 5;

the low-pressure storage tank 2 is provided with a charge level indicator; when the low-pressure storage tank 2 is full, closing the valve XV 11;

low-pressure carbon dioxide enters through a valve XV13 and a ventilation cone at the bottom of the low-pressure storage tank 2, so that the pulverized coal is conveyed after being in a fluidized state, and spontaneous combustion and bridging of the pulverized coal are prevented;

the volume of the low-pressure storage tank 2 is determined according to the load of the gasification furnace, and the consumption is guaranteed to be 3-10 h.

2) First lock hopper unit 3-1 feeds and pressurizes

Opening valves XV01, XV07-1 and XV05-1, and allowing pulverized coal to enter the first lock hopper unit 3-1 from the low-pressure storage tank 2; the first lock hopper unit 3-1 is provided with two material level switches, one is a high material level switch and the other is a low material level switch; when the high level switch of the first lock hopper unit 3-1 is triggered, the valves XV07-1 and XV05-1 are closed;

the volume of the first lock hopper unit 3-1 is determined according to the load of the gasification furnace, and the dosage of 0.3-1h is ensured;

opening a valve XV09-1, and pressurizing high-pressure carbon dioxide by a ventilation cone in the first lock hopper unit 3-1 to ensure that the pulverized coal is in a fluidized state; after the charging is completed, valve XV09-1 is closed.

3) The first lock bucket unit 3-1 discharges materials to the feeding tank 4

Opening a valve XV02-1, and allowing the mixture of the supercritical carbon dioxide, the pulverized coal and the additive to enter a feeding tank 4 by pressure difference; the pressure difference is the pressure difference between the lock hopper and the feeding tank 4; when the first lock hopper unit 3-1 low level switch is triggered, the valve XV02-1 is closed.

The volume of the feed tank 4 is determined according to the load of the gasification furnace.

Valves XV10 and XV14 are always in an open state, and high-pressure nitrogen continuously enters through the vent cone 4-03 at the bottom of the feed tank 4 and the pipeline, so that the pulverized coal is always in a fluidized state.

4) First lock bucket unit 3-1 pressure equalizing and relieving

After the valve XV02-1 is closed, the valve XV06 is opened, and the first bucket locking unit 3-1 and the second bucket locking unit 3-2 perform pressure equalization.

After the pressure equalization is finished, closing the valve XV06, simultaneously opening the valve XV05-1 for pressure relief, filtering high-pressure carbon dioxide gas containing a small amount of pulverized coal by the filter 1 and then emptying, and sending the small amount of pulverized coal into the low-pressure storage tank 2 by the blanking device 5, wherein the small amount of pulverized coal falls into the bottom of the filter 1.

5) Second lock hopper unit 3-2 feeds and pressurizes

The first bucket locking unit 3-1 and the second bucket locking unit 3-2 need to complete feeding before pressure equalization, and the feeding procedure of the second bucket locking unit 3-2 is the same as that of the first bucket locking unit 3-1. Opening valves XV07-2 and XV05-2, and allowing pulverized coal to enter the second locking bucket unit 3-2 from the low-pressure storage tank 2; when the high level switch of the second bucket locking unit 3-2 is triggered, the valves XV07-2 and XV05-2 are closed.

After the pressure equalizing is completed, the pressure boosting procedure of the second bucket locking unit 3-2 is the same as that of the first bucket locking unit 3-1. And opening a valve XV09-2, pressurizing the high-pressure carbon dioxide through a ventilation cone in the second lock hopper unit 3-2, and closing the valve XV09-2 after the second lock hopper unit 3-2 is pressurized.

Then discharging the second lock hopper unit 3-2 into the feeding tank 4, opening a valve XV02-2, and feeding the pulverized coal into the feeding tank 4 by pressure difference; when the second bucket locking unit 3-2 low level switch is triggered, the valve XV02-2 is closed.

After the valve XV02-2 is closed, the valve XV06 is opened, and the first bucket unit 3-1 and the second bucket unit 3-2 perform the pressure equalizing operation again.

6) And after the steps are completed, restarting the first step to perform the next-stage cycle.

7) High pressure delivery to gasifier

Valves XV03-1/2/3/4 and XV04 are always open to feed pulverized coal into the gasifier through regulating valve FV01 and flowmeter 6.

8) A pressure difference meter is arranged inside and outside the cloth bag filter 1 in the filter 1, and when the pressure difference is high, a valve XV12 is opened to blow back the cloth bag filter 1 by low-pressure carbon dioxide.

The pulverized coal flow control scheme is as follows:

the pulverized coal flow rate is measured by the flow meter 6, and is adjusted by adjusting the opening of the valve FV 01.

Under normal conditions, the feeding tank 4 mainly adopts a side discharging mode, and the valve XV03-1/2/3/4 is in an open state; when the flow of the flowmeter 6 is suddenly reduced by more than 1/4, or the regulating valve FV01 is opened to the maximum valve position and still cannot meet the flow requirement, the valve XV08 is opened, the regulating valve FV02 is adjusted, the bottom discharging mode is started, and meanwhile, the flow is regulated by regulating the opening degree of the regulating valve FV01, so that the normal flow is ensured. In order to prevent the accumulation of larger particles at the bottom of the feed tank 4, the bottom discharge mode needs to be started at regular intervals.

Switching the bottom discharging mode back to the side discharging mode, closing valves XV03-1/2/3/4, opening valves XV15-1/2/3/4, and carrying out back flushing on the pipeline where the valves XV03-1/2/3/4 are located, wherein one valve is required to be closed and one pipeline is required to be purged each time; after the dredging of the pipeline where the valves XV03-1/2/3/4 are located is confirmed, the valves XV03-1/2/3/4 are opened in sequence, and meanwhile, the opening sizes of an adjusting valve FV01 and an FV02 are adjusted, so that the stable flow of pulverized coal is ensured; when the regulating valve FV02 is completely closed, the valve XV08 is closed, and the bottom discharge mode is switched to the side discharge mode.

It can be understood that the discharging of the feeding tank 4 in the above embodiments adopts a mode of mainly discharging from the side part and secondarily discharging from the bottom part, and compared with the existing upper discharging and bottom discharging modes, the pulverized coal flow is more stable; meanwhile, the bottom discharging mode and the side discharging mode can be switched, so that the long-period stable operation of the gasification furnace is ensured.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A pulverized coal feed tank, comprising: a side outlet, a bottom outlet and a ventilation cone which are communicated with the lower cone of the feeding tank, wherein,

the side outlets are communicated with the side wall of the lower cone, and the side outlets are uniformly and annularly arranged along the circumferential direction of the lower cone;

the upper end of the ventilation cone is communicated with the lower cone body;

the bottom outlet is communicated with the lower end of the ventilation cone.

2. The pulverized coal feed bucket according to claim 1, further comprising:

and the main pipeline is respectively communicated with the side outlets and the bottom outlet and is used for collecting the materials in the bottom outlet and the side outlets.

3. The pulverized coal feed tank as claimed in claim 2, wherein the main conduit is communicated with the gasification furnace through a flow meter.

4. The pulverized coal feeding bucket according to claim 1, wherein the side outlet is arranged to be inclined downward in the horizontal direction, and a preset included angle is maintained between a central axis of the side outlet and a central axis of the feeding bucket body.

5. The pulverized coal feed bucket according to claim 4, wherein an angle between a central axis of the side outlet and a central axis of the feed bucket body is 40 ° or less.

6. The pulverized coal feed bucket as claimed in claim 1, wherein the side outlets are symmetrically disposed on the lower cone.

7. A pulverized coal feeding bucket according to any one of claims 1 to 6, characterized in that a purge gas pipe is provided on the side outlet for inputting purge gas into the side outlet.

8. The pulverized coal feed tank as claimed in claim 7, wherein the side outlet comprises a reducing diameter and an outlet pipe, one end of the reducing diameter is communicated with the lower cone, and the other end is communicated with the outlet pipe.

9. The pulverized coal feed bin as claimed in claim 8, wherein the purge gas conduit is in communication with the reducing diameter.

10. A pulverized coal conveying system, comprising: a filter, a low-pressure storage tank, a lock hopper, a feeding tank, a blanking device and a flowmeter, wherein,

the feed tank comprising a pulverized coal feed tank as defined in any one of claims 1 to 9 above.

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