CN110669551B

CN110669551B - Coal gasification system and method

Info

Publication number: CN110669551B
Application number: CN201911031669.6A
Authority: CN
Inventors: 蔡川川; 葛涛; 张明旭
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-11-13
Anticipated expiration: 2039-10-28
Also published as: CN110669551A; LU101484B1

Abstract

The invention relates to the technical field of coal gasification, in particular to a coal gasification system and a method, which comprises a gas storage tank for storing inert gas, wherein both ends of the gas storage tank are provided with a pulverized coal storage tank; the gasification furnace is arranged below the gas storage tank, a second connecting pipe used for connecting the pulverized coal storage tank and the gasification furnace is arranged between the pulverized coal storage tank and the gasification furnace, and a first valve is arranged on the second connecting pipe. The invention not only enables the coal gasification system to continuously add pulverized coal into the gasification furnace, but also avoids discharging inert gas into the air, thereby saving the production cost and avoiding the pollution to the environment.

Description

Coal gasification system and method

Technical Field

The invention relates to the technical field of coal gasification, in particular to a coal gasification system and a coal gasification method.

Background

Coal gasification refers to a process of thermochemically processing coal with a gasifying agent at a certain temperature and pressure to convert organic matters in the coal into coal gas. The meaning is a multi-phase reaction process which takes coal, semi-coke or coke as raw materials and takes air, oxygen-enriched air, water vapor, carbon dioxide or hydrogen as gasification media to lead the coal to be subjected to partial oxidation and reduction reaction and convert substances containing carbon, hydrogen and the like into gas products mainly containing combustible components such as carbon monoxide, hydrogen, methane and the like.

Coal gasification feeding is usually carried out in a lock hopper, coal is firstly added into the lock hopper, then the lock hopper is closed, inert gas is filled into the lock hopper, so that the air pressure in the lock hopper is the same as the pressure of the gasification furnace, then the coal is conveyed into the gasification furnace, then a valve between the lock hopper and the gasification furnace is closed, and the inert gas is discharged from the lock hopper for next feeding. The feeding method has low efficiency, discharges a large amount of nitrogen and carbon dioxide into the air, and is not environment-friendly.

Disclosure of Invention

Aiming at the defects of low feeding efficiency and environmental pollution in the coal gasification process in the prior art, the invention provides a coal gasification system and a coal gasification method. It can reach the effect that promotes the reinforced efficiency of fine coal and avoid the polluted environment.

In order to solve the technical problem, the invention is solved by the following technical scheme:

a coal gasification system comprises a gas storage tank for storing inert gas, wherein both ends of the gas storage tank are provided with a pulverized coal storage tank, a first connecting pipe for connecting the gas storage tank and the pulverized coal storage tank is arranged between the pulverized coal storage tank and the gas storage tank, and the first connecting pipe is provided with a pumping mechanism for conveying gas in the gas storage tank and the pulverized coal storage tank; the gasification furnace is arranged below the gas storage tank, a second connecting pipe used for connecting the pulverized coal storage tank and the gasification furnace is arranged between the pulverized coal storage tank and the gasification furnace, and a first valve is arranged on the second connecting pipe.

By the arrangement of the gas storage tank and the pulverized coal storage tanks at two ends, the coal gasification system can continuously add pulverized coal into the gasification furnace, so that the coal gasification efficiency is improved better. Meanwhile, the inert gas is prevented from being discharged into the air, so that the production cost is saved, and the environmental pollution is avoided.

Preferably, the pumping mechanism comprises a U-shaped connecting pipe which is arranged on the first connecting pipe and two end parts of which are connected with the first connecting pipe, a third connecting pipe which is connected with the U-shaped connecting pipe is arranged on the first connecting pipe and is positioned between the connecting part of the U-shaped connecting pipe and the first connecting pipe, and a first air pump is arranged on the third connecting pipe; a second valve and a third valve are respectively arranged at two ends of the U-shaped connecting pipe, which are positioned at the joint of the U-shaped connecting pipe and the third connecting pipe, the second valve is arranged at a position close to the pulverized coal storage tank, and the third valve is arranged at a position close to the gas storage tank; the first connecting pipe is provided with a fourth valve and a fifth valve which are positioned at two ends of the joint of the third connecting pipe and the first connecting pipe, and the fourth valve is arranged between the joint of the third connecting pipe and the first connecting pipe and the joint of the U-shaped connecting pipe and the first connecting pipe and is close to the end of the pulverized coal storage tank; the fifth valve is arranged between the joint of the third connecting pipe and the first connecting pipe and the joint of the U-shaped connecting pipe and the first connecting pipe and is close to the gas storage tank.

According to the invention, through the arrangement of the pumping mechanism, when the gas storage tank and the pulverized coal storage tank are charged and discharged with air pressure, the air pressure in the pulverized coal storage tank and the air pressure in the gas storage tank can be the same through the communication of the pipelines, and the exchange of the air pressure of the pulverized coal storage tank and the air pressure of the gas storage tank by directly utilizing the first air pump is avoided, so that the damage of the first air pump caused by overhigh air pressure is avoided, and the stability of the coal gasification system is improved better.

Preferably, be equipped with the filter equipment who is located between pumping mechanism and the fine coal holding vessel on the first connecting pipe, filter equipment includes the filter screen mount pad, is equipped with the filter screen installation cavity in the filter screen mount pad, is equipped with a plurality of groups of draw-in grooves in the filter screen installation cavity, and the joint has first filter screen in the draw-in groove, and the upper end of filter screen mount pad is equipped with and is used for carrying out sealed filter screen installation cavity apron to the filter screen installation cavity.

According to the invention, the pulverized coal in the first connecting pipe can be filtered through the arrangement of the filtering mechanism, so that the first air pump is prevented from being damaged when the pulverized coal enters the first air pump, and the stability of the coal gasification system in the embodiment is improved better.

As preferred, filter screen installation chamber bottom undercut forms filter screen installation step, is equipped with the first filter screen of perpendicular to setting up on the filter screen installation step and is used for carrying out the second filter screen that supports to first filter screen, and the bottom of second filter screen is equipped with the whole powdered coal storage chamber that is radius platform type.

According to the invention, the pulverized coal in the filter screen installation cavity can fall into the pulverized coal storage cavity through the arrangement of the second filter screen and the pulverized coal storage, so that the pulverized coal in the filter device can be conveniently collected.

Preferably, a fourth connecting pipe used for connecting the pulverized coal storage tank and the filter screen mounting seat is arranged between the pulverized coal storage tank and the filter screen mounting seat, the end part of the fourth connecting pipe is connected with the pulverized coal storage cavity, and a sixth valve is arranged on the fourth connecting pipe.

According to the invention, through the arrangement of the fourth connecting pipe and the sixth valve, the sixth valve can be opened when the pulverized coal storage tank is pressurized, so that the pulverized coal in the pulverized coal storage cavity can be conveyed to the pulverized coal storage tank through the fourth connecting pipe, and the pulverized coal in the pulverized coal storage cavity can be conveniently recycled.

Preferably, a pressure relief device is arranged on the first connecting pipe and between the filtering device and the U-shaped connecting pipe, the pressure relief device comprises a tubular pressure relief pipe, an inner pipe is arranged in the pressure relief pipe, a pressure relief cavity is formed by the inner wall of the pressure relief pipe and the outer wall of the inner pipe, a first annular mounting plate fixedly connected with the inner side wall of the pressure relief pipe is arranged on the outer side wall of the center of the inner pipe, and the pressure relief cavity is divided into two relatively independent spaces by the first annular mounting plate; a second annular mounting plate is arranged at the center of the inner tube, a plurality of air guide holes which are uniform and distributed at intervals along the axis direction of the inner tube are arranged on the outer side wall of the inner tube, which is close to the second annular mounting plate, a sliding column is arranged in the inner tube in a sliding manner, a blind hole is arranged on the end part, close to the second annular mounting plate, of the sliding column, a spring is arranged in the inner tube, one end of the spring is abutted against the blind hole, and the other end of the spring is abutted; the opening parts at the two ends of the inner pipe are provided with baffle plates used for blocking the sliding column, and the center of each baffle plate is provided with a through hole of the baffle plate.

According to the invention, through the arrangement of the pressure relief device, the shaking of the pipeline caused by the rapid change of the pressure when the inert gas is exchanged between the pulverized coal storage tank and the gas storage pipe can be avoided, so that the stability of the coal gasification system in use is improved.

Preferably, the baffle is threadedly coupled to the inner wall of the inner tube.

In the invention, the baffle is connected with the inner pipe through the threads, so that the installation of the baffle is convenient, the replacement of the sliding column and the spring is convenient, and the daily maintenance is convenient.

Preferably, the two end parts of the pressure relief pipe are expanded outwards along the circumferential direction to form a connecting seat, and a plurality of connecting seat through holes which are uniformly distributed are formed in the connecting seat.

According to the invention, through the arrangement of the connecting seat through hole, when the pressure relief device is installed, the pressure relief device can be installed on the first connecting pipe through the bolt penetrating through the connecting seat through hole, so that the installation of the pressure relief device is conveniently realized.

Preferably, a second air pump for pumping the inert gas into the gas storage tank is connected to the gas storage tank.

According to the invention, through the arrangement of the second air pump, after a small amount of inert gas enters the gasification furnace through the pulverized coal storage tank and the second connecting pipe and is discharged through the gasification furnace, the inert gas can be pumped into the gas storage tank through the second air pump, so that the stability of the coal gasification system in use is improved.

The invention also provides a gasification method based on any one of the coal gasification systems, which comprises the following steps:

opening a discharge port of a crushing kettle on one of the pulverized coal storage tanks to enable pulverized coal in the crushing kettle to enter the pulverized coal storage tank connected with the crushing kettle through a feed pipeline;

secondly, after the pulverized coal in the pulverized coal storage tank is accumulated to a certain amount, a power supply of a pumping mechanism is connected to charge the inert gas in the gas storage tank into the pulverized coal storage tank, and when the pressure in the pulverized coal storage tank is the same as that of the gasification furnace, a first valve is opened to enable the pulverized coal in the pulverized coal storage tank to fall into the gasification furnace and be gasified in the gasification furnace;

step three, when the pulverized coal in the pulverized coal storage tank is conveyed to the gasification furnace, a feed inlet of a crushing kettle in the pulverized coal storage tank for adding the pulverized coal is opened, so that the pulverized coal in the crushing kettle enters the pulverized coal storage tank, when the pulverized coal in the pulverized coal storage tank is completely discharged into the gasification furnace, the addition of the pulverized coal in another pulverized coal storage tank is completed, and at the moment, a relevant valve on the pumping mechanism is opened, so that the pressure in the gas storage tank is equal to the pressure in two adjacent pulverized coal storage tanks;

regulating the closing of a valve on the pumping mechanism, and then reducing the pressure in the pulverized coal storage tank for emptying the pulverized coal to the atmospheric pressure under the action of the pumping mechanism, so that the pressure of the pulverized coal storage tank filled with the pulverized coal is equal to that of the gasification furnace;

and step five, repeating the operation from the step one to the step four in sequence.

Drawings

Fig. 1 is a schematic configuration diagram of a coal gasification system in example 1.

Fig. 2 is an enlarged view of a portion a in example 1.

Fig. 3 is a cross-sectional view of the filter device of fig. 1.

Fig. 4 is a schematic structural view of the pressure relief device in fig. 1.

Fig. 5 is a cross-sectional view of the pressure relief device of fig. 4.

Fig. 6 is a cross-sectional view of the crushing tank of fig. 1.

Fig. 7 is a schematic structural view of the support plate in fig. 6.

Fig. 8 is a schematic view of the crushing chamber of fig. 6.

Fig. 9 is a schematic structural view of the rotating shaft in fig. 6.

Fig. 10 is a schematic view showing the structure of the rotation plate in fig. 6.

The names of the parts indicated by the numerical references in the drawings are as follows:

110. a gas storage tank; 111. a second air pump; 120. a pulverized coal storage tank; 121. a crushing kettle; 122. a feed conduit; 130. a first connecting pipe; 140. a gasification furnace; 150. a second connecting pipe; 151. a first valve; 160. a U-shaped connecting pipe; 170. a filter screen mounting base; 180. a fourth connecting pipe; 181. a sixth valve; 190. a pressure relief pipe; 210. a third connecting pipe; 220. a first air pump; 230. a second valve; 240. a third valve; 250. a fourth valve; 260. a fifth valve; 310. a filter screen mounting cavity; 320. a card slot; 330. a first filter screen; 340. a filter screen is provided with a cavity cover plate; 350. mounting a step on the filter screen; 360. a second filter screen; 370. a pulverized coal storage chamber; 410. an inner tube; 420. a connecting seat; 421. a connecting seat through hole; 510. a pressure relief cavity; 520. a first annular mounting plate; 530. a second annular mounting plate; 540. an air vent; 550. a sliding post; 551. blind holes; 560. a spring; 570. a baffle plate; 571. a baffle through hole; 610. a crushing chamber; 620. a support plate; 630. a rotating shaft; 640. a rotating plate; 650. crushing a cover plate of the kettle; 651. a feed inlet; 660. a motor; 710. a material passing through hole; 720. a bump; 721. a bump through hole; 810. a strip-shaped groove; 820. an annular groove; 830. a limiting hole; 840. a limiting rod; 910. a rotating plate clamping groove; 1010. a rotating plate through hole; 1020. and (7) clamping blocks.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention and not limiting.

Example 1

As shown in fig. 1 to 10, the present embodiment provides a coal gasification system, which includes a gas storage tank 110 for storing inert gas, both ends of the gas storage tank 110 are provided with pulverized coal storage tanks 120, the upper end of the pulverized coal storage tank 120 is connected with a crushing mechanism, the crushing mechanism includes a crushing kettle 121, a feeding pipe 122 is connected between the crushing kettle 121 and the pulverized coal storage tank 120, a crushing cavity 610 is provided in the crushing kettle 121, a plurality of support plates 620 are provided in the crushing cavity 610 at intervals along the height direction of the crushing cavity 610, a rotatable rotating shaft 630 is provided at the center of the crushing cavity 610, a plurality of rotating plates 640 for cooperating with the support plates 620 are provided on the rotating shaft 630, and the support plates 620 and the rotating plates 640 are provided with material passing through holes 710 for allowing pulverized coal to pass through; a first connecting pipe 130 for connecting the gas storage tank 110 and the pulverized coal storage tank 120 is arranged between the pulverized coal storage tank 120 and the gas storage tank 110, and a pumping mechanism for conveying gas in the gas storage tank 110 and the pulverized coal storage tank 120 is arranged on the first connecting pipe 130; a gasification furnace 140 is arranged below the gas storage tank 110, a second connection pipe 150 for connecting the pulverized coal storage tank 120 and the gasification furnace 140 is arranged between the pulverized coal storage tank 120 and the gasification furnace 140, and a first valve 151 is arranged on the second connection pipe 150.

Through the arrangement of the gas storage tank 110 and the pulverized coal storage tanks 120 at two ends in the embodiment, when adding pulverized coal, a worker can control the pumping mechanism to enable the two pulverized coal storage tanks 120 to be in different working states, that is, when one pulverized coal storage tank 120 is in a state of adding pulverized coal into the gasifier, the other pulverized coal storage tank 120 is in a state of filling pulverized coal; therefore, the coal gasification system can continuously add pulverized coal into the gasification furnace 140, and the coal gasification efficiency is improved better. Meanwhile, after the pulverized coal in the pulverized coal storage tank 120 is filled, the worker can pump the inert gas in the pulverized coal storage tank 120 to the gas storage tank 110 through the pumping mechanism, so that the inert gas is prevented from being discharged into the air, the production cost is saved, and the environmental pollution is avoided. The arrangement of the crushing mechanism enables the crushing kettle 121 to continuously produce the pulverized coal, and the pulverized coal produced by the crushing mechanism can be conveniently conveyed to the pulverized coal storage tank 120, so that the production efficiency of the coal gasification system is improved better.

In this embodiment, the pumping mechanism includes a U-shaped connection pipe 160 disposed on the first connection pipe 130 and having two ends connected to the first connection pipe 130, a third connection pipe 210 connected to the U-shaped connection pipe 160 is disposed on the first connection pipe 130 and located between the connection point of the U-shaped connection pipe 160 and the first connection pipe 130, and a first air pump 220 is disposed on the third connection pipe 210; a second valve 230 and a third valve 240 are respectively arranged at two ends of the U-shaped connecting pipe 160, which are located at the connection position of the U-shaped connecting pipe 160 and the third connecting pipe 210, the second valve 230 is arranged near the pulverized coal storage tank 120, and the third valve 240 is arranged near the gas storage tank 110; the first connecting pipe 130 is provided with a fourth valve 250 and a fifth valve 260 which are positioned at two ends of the connection part of the third connecting pipe 210 and the first connecting pipe 130, and the fourth valve 250 is arranged between the connection part of the third connecting pipe 210 and the first connecting pipe 130 and the connection part of the U-shaped connecting pipe 160 and the first connecting pipe 130 and is close to the end of the pulverized coal storage tank 120; the fifth valve 260 is disposed between a connection of the third connection pipe 210 and the first connection pipe 130 and a connection of the U-shaped connection pipe 160 and the first connection pipe 130 near the gas storage tank 110.

By the arrangement of the pumping mechanism structure in this embodiment, when the pulverized coal storage tank 120 is pressurized, the fourth valve 250 and the fifth valve 260 are opened first, so that the second valve 230 and the third valve 240 are in a closed state, the inert gas in the gas storage tank 110 will flow into the pulverized coal storage tank 120, when the pressure in the gas storage tank 110 is equal to the pressure in the pulverized coal storage tank 120, the third valve 240 is opened, the fourth valve 250 is closed, the power supply of the first air pump 220 is turned on, and the inert gas in the gas storage tank 110 is continuously charged into the pulverized coal storage tank 120 until the pressure in the pulverized coal storage tank 120 is equal to the pressure in the gasification furnace 140; after the transportation of the pulverized coal in the pulverized coal storage tank 120 is completed, the second valve 230 and the third valve 240 are opened, so that the fourth valve 250 and the fifth valve 260 are in a closed state, at this time, the inert gas in the pulverized coal storage tank 120 will flow into the gas storage tank 110, when the pressure in the pulverized coal storage tank 120 is the same as the pressure in the gas storage tank 110, the fourth valve 250 is opened, the fifth valve 260 is closed, and the power supply of the first air pump 220 is connected, so that the inert gas in the pulverized coal storage tank 120 can be pumped into the gas storage tank 110 until the pressure in the pulverized coal storage tank 120 is the same as the atmospheric pressure. Through the setting of pumping mechanism, can be so that when gaseous holding vessel 110 and fine coal holding vessel 120 carried out towards putting atmospheric pressure, can make fine coal holding vessel 120 the atmospheric pressure the same with among the gaseous holding vessel 110 through the intercommunication of pipeline earlier, avoided directly utilizing first air pump 220 to carry out the exchange of fine coal holding vessel 120 and gaseous holding vessel 110 atmospheric pressure, thereby avoided leading to the damage of first air pump 220 because gas pressure is too high, thereby the promotion of preferred this coal gasification system's stability.

In this embodiment, be equipped with the filter equipment who is located between pumping mechanism and the fine coal storage tank 120 on first connecting pipe 130, filter equipment includes filter screen mount pad 170, is equipped with filter screen installation cavity 310 in the filter screen mount pad 170, is equipped with a plurality of groups of draw-in grooves 320 in the filter screen installation cavity 310, and the joint has first filter screen 330 in the draw-in groove 320, and the upper end of filter screen mount pad 170 is equipped with and is used for carrying out sealed filter screen installation cavity apron 340 to filter screen installation cavity 310.

Through the setting of the filtering mechanism in this embodiment, the fine coal in the first connecting pipe 130 can be filtered, and the damage of the first air pump 220 caused by the fine coal entering the first air pump 220 is avoided, so that the stability of the coal gasification system in this embodiment is improved.

In this embodiment, the bottom surface of the filter screen installation cavity 310 is recessed downwards to form a filter screen installation step 350, the filter screen installation step 350 is provided with a second filter screen 360 which is perpendicular to the first filter screen 330 and is used for supporting the first filter screen 330, and the bottom end of the second filter screen 360 is provided with an inverted circular truncated cone-shaped pulverized coal storage cavity 370.

Through the setting of second filter screen 360 and fine coal storage cavity 370 in this embodiment, can make the fine coal in filter screen installation cavity 310 can fall to fine coal storage cavity 370 in to convenient the fine coal to among the filter equipment to collect.

In this embodiment, a fourth connection pipe 180 for connecting the pulverized coal storage tank 120 and the screen mounting seat 170 is disposed between the pulverized coal storage tank 120 and the screen mounting seat 170, an end of the fourth connection pipe 180 is connected to the pulverized coal storage cavity 370, and a sixth valve 181 is disposed on the fourth connection pipe 180.

Through the setting of fourth connecting pipe 180 and sixth valve 181 in this embodiment, can make when pressurizeing in the fine coal storage tank 120, can open sixth valve 181 for during the fine coal in the fine coal storage chamber 370 can be carried to fine coal storage tank 120 through fourth connecting pipe 180, thereby made things convenient for the recycle to fine coal in the fine coal storage chamber 370.

In this embodiment, a pressure relief device is arranged on the first connecting pipe 130 between the filtering device and the U-shaped connecting pipe 160, the pressure relief device includes a tubular pressure relief pipe 190, an inner pipe 410 is arranged in the pressure relief pipe 190, a pressure relief cavity 510 is formed by the inner wall of the pressure relief pipe 190 and the outer wall of the inner pipe 410, a first annular mounting plate 520 fixedly connected with the inner side wall of the pressure relief pipe 190 is arranged on the outer side wall of the center of the inner pipe 410, and the pressure relief cavity 510 is divided into two relatively independent spaces by the first annular mounting plate 520; a second annular mounting plate 530 is arranged at the center of the inner pipe 410, a plurality of air guide holes 540 which are uniformly distributed at intervals along the axial direction of the inner pipe 410 are arranged at the end, close to the second annular mounting plate 530, of the outer side wall of the inner pipe 410, a sliding column 550 is slidably arranged in the inner pipe 410, a blind hole 551 is arranged at the end, close to the second annular mounting plate 530, of the sliding column 550, a spring 560 is arranged in the inner pipe 410, one end of the spring 560 abuts against the blind hole 551, and the other end of the spring 560 abuts against the second annular mounting; the openings at the two ends of the inner tube 410 are provided with baffles 570 for blocking the sliding columns 550, and the centers of the baffles 570 are provided with baffle through holes 571.

With the arrangement of the pressure relief device in this embodiment, when the pulverized coal storage tank 120 and the gas storage tank 110 are exchanged, the inert gas enters from the cavity on one side between the inner pipe 410 and the pressure relief pipe 190, flows into the inner pipe 410 through the gas holes 540 on one side of the second annular mounting plate 530, and then flows out through the second annular mounting plate 530 of the inner pipe 410 through the gas holes 540 on the other side of the second annular mounting plate 530. When the sliding column 550 is pressurized, the sliding column 550 moves toward one side of the second annular mounting plate 530 to block the gas guide hole 540, so that the flow rate of the gas is reduced, and the shaking of the pipeline caused by the rapid change of the pressure when the inert gas is exchanged between the pulverized coal storage tank 120 and the gas storage pipe 110 is avoided, thereby improving the stability of the coal gasification system in use.

In this embodiment, the baffle 570 is threadedly coupled to the inner wall of the inner tube 410.

Through the threaded connection of the baffle 570 and the inner tube 410 in the embodiment, the installation of the baffle 570 is facilitated, and the sliding column 550 and the spring 560 are also convenient to replace, so that the daily maintenance is facilitated.

In this embodiment, two ends of the pressure relief pipe 190 are expanded along the circumferential direction to form a connection seat 420, and a plurality of connection seat through holes 421 are uniformly distributed on the connection seat 420.

Through the setting of connecting seat through-hole 421 in this embodiment, can be so that when carrying out the installation to this pressure relief device, can install pressure relief device on first connecting pipe 130 through the bolt that passes connecting seat through-hole 421 to comparatively convenient realization to pressure relief device's installation.

In this embodiment, a second air pump 111 for pumping an inert gas into the gas storage tank is connected to the gas storage tank 110.

Through the arrangement of the second air pump 111 in this embodiment, after a small amount of inert gas enters the gasification furnace 140 through the pulverized coal storage tank 120 and the second connecting pipe 150 and is discharged through the gasification furnace 140, the inert gas can be pumped into the gas storage tank 111 through the second air pump 111, so that the stability of the coal gasification system in use is improved.

In this embodiment, the sidewall of the crushing cavity 610 is provided with a plurality of strip-shaped grooves 810 arranged along the height direction of the crushing cavity 610, the sidewall of the crushing cavity 610 is provided with a plurality of annular grooves 820 arranged along the height direction of the crushing cavity 610, and the supporting plate 620 is provided with a protrusion 720 matched with the strip-shaped grooves 810 and the annular grooves 820.

Through the arrangement of the strip-shaped groove 810, the annular groove 820 and the bump 720 in the embodiment, when the supporting plate 620 is installed, the bump 720 on the supporting plate 620 is placed in the strip-shaped groove 810, then the supporting plate 620 is moved, when the supporting plate 620 moves to the annular groove 820, the supporting plate 620 is rotated, so that the bump 720 is screwed into the annular groove 820, and the supporting plate 620 is conveniently installed.

In this embodiment, a plurality of rotating plate slots 910 are formed in the side wall of the rotating shaft 630 along the height direction thereof, a rotating plate through hole 1010 in clearance fit with the rotating shaft 630 is formed in the center of the rotating plate 640, and a clamping block 1020 in fit with the rotating plate slots 910 is formed on the inner wall of the rotating plate through hole 1010; the side wall of the crushing kettle 121 is provided with a limiting hole 830 penetrating through the annular groove 820, the bump 720 is provided with a bump through hole 721 matched with the limiting hole 830, and the limiting hole 830 is internally provided with a limiting rod 840 penetrating through the bump through hole 721.

Through the arrangement of the limiting hole 830, the bump through hole 721 and the limiting rod 840 in the embodiment, the supporting plate 620 can be limited through the matching of the limiting rod 840 and the bump through hole 721, the supporting plate 620 is prevented from rotating when in use, and therefore the stability of the coal gasification system in use is improved.

In this embodiment, a crushing kettle cover 650 for sealing the crushing cavity 610 is disposed at the upper end of the crushing kettle 121, and a motor 660 for driving the rotating shaft 630 is disposed on the crushing kettle cover 650; crushing kettle cover plate 650 is provided with a plurality of even feed inlets 651.

Through the arrangement of the feed inlet 651 and the crushing kettle cover plate 650 in this embodiment, when coal is crushed, coal can be continuously added into the crushing cavity 610 through the feed inlet 651, so that the crushing kettle 121 can continuously crush coal.

The embodiment also provides a gasification method based on the coal gasification system, which comprises the following steps:

step one, opening a discharge port of a crushing kettle 121 on one pulverized coal storage tank 120, so that pulverized coal in the crushing kettle 121 enters the pulverized coal storage tank 120 connected with the crushing kettle 121 through a feed pipe 122;

step two, after the pulverized coal in the pulverized coal storage tank 120 is accumulated to a certain amount, the power supply of the pumping mechanism is switched on to charge the inert gas in the gas storage tank 110 into the pulverized coal storage tank 120, and when the pressure in the pulverized coal storage tank 120 is the same as the pressure in the gasification furnace 140, the first valve 151 is opened, so that the pulverized coal in the pulverized coal storage tank 120 falls into the gasification furnace 140 and is gasified in the gasification furnace 140;

step three, when the pulverized coal in the pulverized coal storage tank 120 is conveyed to the gasification furnace 140, the feeding hole of the upper crushing kettle 121 in the pulverized coal storage tank 120 which is added with the pulverized coal is opened, so that the pulverized coal in the crushing kettle 121 enters the pulverized coal storage tank 120, when the pulverized coal in the pulverized coal storage tank 120 is completely discharged into the gasification furnace 140, the addition of the pulverized coal in the other pulverized coal storage tank 120 is completed, and at the moment, the related valve on the pumping mechanism is opened, so that the pressure in the gas storage tank 110 is equal to the pressure in the two adjacent pulverized coal storage tanks 120;

fourthly, adjusting the closing of a valve on the pumping mechanism, and then reducing the medium pressure of the pulverized coal storage tank 120 for emptying the pulverized coal to the atmospheric pressure through the action of the pumping mechanism, so that the pressure of the pulverized coal storage tank 120 for filling the pulverized coal is equal to that of the gasification furnace 140;

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims

1. Coal gasification system, its characterized in that: the device comprises a gas storage tank (110) for storing inert gas, wherein both ends of the gas storage tank (110) are provided with a pulverized coal storage tank (120), a first connecting pipe (130) for connecting the gas storage tank (110) and the pulverized coal storage tank (120) is arranged between the pulverized coal storage tank (120) and the gas storage tank (110), and a pumping mechanism for conveying gas in the gas storage tank (110) and the pulverized coal storage tank (120) is arranged on the first connecting pipe (130); the pumping mechanism comprises a U-shaped connecting pipe (160) which is arranged on a first connecting pipe (130) and two ends of the U-shaped connecting pipe are connected with the first connecting pipe (130), a pressure relief device is arranged between the filtering device and the U-shaped connecting pipe (160) on the first connecting pipe (130), the pressure relief device comprises a tubular pressure relief pipe (190), an inner pipe (410) is arranged in the pressure relief pipe (190), the inner wall of the pressure relief pipe (190) and the outer wall of the inner pipe (410) form a pressure relief cavity (510), a first annular mounting plate (520) fixedly connected with the inner side wall of the pressure relief pipe (190) is arranged on the outer side wall of the center of the inner pipe (410), and the pressure relief cavity (510) is divided into two relatively independent spaces by the first annular mounting; a second annular mounting plate (530) is arranged at the center of the inner pipe (410), a plurality of air guide holes (540) which are uniform and distributed at intervals along the axial direction of the inner pipe (410) are formed in the outer side wall of the inner pipe (410) and close to the second annular mounting plate (530), a sliding column (550) is slidably arranged in the inner pipe (410), a blind hole (551) is formed in the end part, close to the second annular mounting plate (530), of the sliding column (550), a spring (560) is arranged in the inner pipe (410), one end of the spring (560) abuts against the blind hole (551), and the other end of the spring (560) abuts against the second annular mounting plate (530); the openings at the two ends of the inner pipe (410) are provided with baffles (570) used for blocking the sliding column (550), and the centers of the baffles (570) are provided with baffle through holes (571); a gasification furnace (140) is arranged below the gas storage tank (110), a second connecting pipe (150) used for connecting the pulverized coal storage tank (120) and the gasification furnace (140) is arranged between the pulverized coal storage tank (120) and the gasification furnace (140), and a first valve (151) is arranged on the second connecting pipe (150).

2. The coal gasification system of claim 1, wherein: a third connecting pipe (210) connected with the U-shaped connecting pipe (160) is arranged on the first connecting pipe (130) and positioned between the U-shaped connecting pipe (160) and the connecting part of the first connecting pipe (130), and a first air pump (220) is arranged on the third connecting pipe (210); a second valve (230) and a third valve (240) are respectively arranged at two ends of the U-shaped connecting pipe (160) at the joint of the U-shaped connecting pipe (160) and the third connecting pipe (210), the second valve (230) is arranged at a position close to the pulverized coal storage tank (120), and the third valve (240) is arranged at a position close to the gas storage tank (110); a fourth valve (250) and a fifth valve (260) which are positioned at two ends of the joint of the third connecting pipe (210) and the first connecting pipe (130) are arranged on the first connecting pipe (130), and the fourth valve (250) is arranged between the joint of the third connecting pipe (210) and the first connecting pipe (130) and the joint of the U-shaped connecting pipe (160) and the first connecting pipe (130) and is close to the end of the pulverized coal storage tank (120); the fifth valve (260) is disposed between the connection of the third connection pipe (210) and the first connection pipe (130) and the connection of the U-shaped connection pipe (160) and the first connection pipe (130) and near the gas storage tank (110).

3. The coal gasification system of claim 2, wherein: be equipped with the filter equipment who is located between pumping mechanism and fine coal storage tank (120) on first connecting pipe (130), filter equipment includes filter screen mount pad (170), is equipped with filter screen installation cavity (310) in filter screen mount pad (170), is equipped with a plurality of groups draw-in groove (320) in filter screen installation cavity (310), and the joint has first filter screen (330) in draw-in groove (320), and the upper end of filter screen mount pad (170) is equipped with and is used for carrying out sealed filter screen installation cavity apron (340) to filter screen installation cavity (310).

4. A coal gasification system as claimed in claim 3 wherein: filter screen installation cavity (310) bottom surface undercut forms filter screen installation step (350), is equipped with second filter screen (360) that perpendicular to first filter screen (330) set up and be used for carrying out the support to first filter screen (330) on filter screen installation step (350), and the bottom of second filter screen (360) is equipped with whole pulverized coal storage chamber (370) that are the radius bench type.

5. The coal gasification system of claim 4, wherein: a fourth connecting pipe (180) used for connecting the pulverized coal storage tank (120) and the filter screen mounting seat (170) is arranged between the pulverized coal storage tank (120) and the filter screen mounting seat (170), the end part of the fourth connecting pipe (180) is connected with the pulverized coal storage cavity (370), and a sixth valve (181) is arranged on the fourth connecting pipe (180).

6. The coal gasification system of claim 1, wherein: the baffle (570) is in threaded connection with the inner wall of the inner tube (410).

7. The coal gasification system of claim 6, wherein: two ends of the pressure relief pipe (190) are expanded outwards along the circumferential direction to form a connecting seat (420), and a plurality of connecting seat through holes (421) which are uniformly distributed are formed in the connecting seat (420).

8. The coal gasification system of claim 1, wherein: the gas storage tank (110) is connected with a second gas pump (111) for pumping inert gas into the gas storage tank.

9. The production method of a coal gasification system according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:

step one, opening a discharge port of a crushing kettle (121) on one pulverized coal storage tank (120) to enable pulverized coal in the crushing kettle (121) to enter the pulverized coal storage tank (120) connected with the crushing kettle through a feeding pipeline (122);

secondly, after the pulverized coal in the pulverized coal storage tank (120) is accumulated to a certain amount, a power supply of a pumping mechanism is connected to charge the inert gas in the gas storage tank (110) into the pulverized coal storage tank (120), and when the pressure in the pulverized coal storage tank (120) is the same as that of the gasification furnace (140), a first valve (151) is opened, so that the pulverized coal in the pulverized coal storage tank (120) falls into the gasification furnace (140) and is gasified in the gasification furnace (140);

step three, when the pulverized coal in the pulverized coal storage tank (120) is conveyed to the gasification furnace (140), a feed inlet of an upper crushing kettle (121) in the pulverized coal storage tank (120) which is added with the pulverized coal is opened, so that the pulverized coal in the crushing kettle (121) enters the pulverized coal storage tank (120), when the pulverized coal in the pulverized coal storage tank (120) is completely discharged into the gasification furnace (140), the pulverized coal in another pulverized coal storage tank (120) is added, and at the moment, a relevant valve on a pumping mechanism is opened, so that the pressure in the gas storage tank (110) is equal to the pressure in two adjacent pulverized coal storage tanks (120);

fourthly, adjusting the closing of a valve on the pumping mechanism, and then reducing the pressure in the pulverized coal storage tank (120) for emptying the pulverized coal to the atmospheric pressure under the action of the pumping mechanism, so that the pressure of the pulverized coal storage tank (120) filled with the pulverized coal is equal to that of the gasification furnace (140);