CN116064172A - Powder process system - Google Patents

Abstract

The present disclosure provides a pulverizing system including a coal pulverizing and drying unit; the device also comprises a low-pressure dense phase conveying unit and a high-pressure dense phase conveying unit which are integrally arranged; the low-pressure dense-phase conveying unit comprises an intermediate bin, a low-pressure dense-phase powder pump and a low-pressure carbon dioxide system; the low-pressure dense-phase powder pump and the low-pressure carbon dioxide system are respectively communicated with the outlet of the intermediate bin through respective outlets; the high-pressure dense-phase conveying unit comprises a pulverized coal storage bin, a pulverized coal pressurizing lock hopper, a pulverized coal pressurizing feed tank and a high-pressure carbon dioxide system which are sequentially communicated; the high-pressure carbon dioxide system is respectively communicated with the pulverized coal pressurizing lock hopper, the pulverized coal pressurizing feed tank and the pulverized coal pipeline; the coal grinding drying unit is communicated with the middle bin of the low-pressure dense-phase conveying unit; the low-pressure dense-phase powder pump is communicated with the pulverized coal storage bin; the pulverized coal pressurizing feeding tank is communicated with a gasification furnace burner of a downstream device through a pulverized coal pipeline; through the embodiment of the disclosure, the height of the frame can be reduced, the occupied area is saved, and the overrun of the fireproof partition area can be avoided.

Description

Powder process system

Technical Field

The invention belongs to the technical field of coal gasification, and particularly relates to a coal pulverizing system.

Background

The basic principle of the pulverized coal pressurized gasification technology is that coal is ground into dry pulverized coal with proper granularity, and the dry pulverized coal is continuously fed into a gasification furnace by high-temperature inert gas, and meanwhile oxygen and water vapor are supplemented to participate in the reaction under the conditions of high temperature and high pressure so as to generate crude gas hydrogen and carbon monoxide.

The blocky raw coal with the grain diameter smaller than 30mm from the factory is sent into a coal grinding and drying unit through a coal conveying belt to be ground and dried, and finally pulverized coal grains with the water content of 2% -5% and the grain diameter smaller than 90 μm are obtained and sent into a gasifier burner after being pressurized.

In the traditional medium and small-sized coal chemical engineering projects, the coal grinding and drying unit, the high-pressure pulverized coal conveying unit and the gasification unit are commonly arranged on the same frame, the overall frame is higher, as the scale of the coal chemical engineering projects is larger and larger, the pulverized coal pressurized gasification device tends to be larger and larger, the coal grinding and drying unit and the high-pressure pulverized coal conveying unit are still arranged on the same frame as the gasification unit, and the area of a fireproof partition is easy to overrun; and the gasification unit belongs to a class A production device, and when the gasification unit is arranged on the same frame, the explosion-proof grades are all selected to be higher, so that the equipment and instrument cost is higher.

The pulverized coal preparation systems of the existing pulverized coal pressurized gasification devices generally have two types: gravity blanking conveying and pneumatic conveying;

the gravity blanking conveying means that dry pulverized coal prepared by a coal grinding and drying unit is blanked to a pulverized coal storage bin through a rotary discharge valve and a screw conveyor under the gravity action from a bag filter ash bucket at the top of a frame, and is pressurized by a pulverized coal pressurizing lock bucket and a pulverized coal pressurizing feed tank, and then is conveyed to a high-pressure pulverized coal conveying pipeline through high-pressure gas to enter a gasifier burner. This type of pulverized coal production system typically has the gasification units arranged in the same frame, and the overall frame height is high.

Pneumatic conveying means that dry pulverized coal prepared by a pulverized coal and drying unit falls into an intermediate bin from a bag filter ash bucket at the top of a frame through a rotary discharge valve, a low-pressure dense-phase powder pump is directly connected below the intermediate bin, the pulverized coal is injected into a pulverized coal storage bin through a low-pressure coal conveying pipeline by low-pressure gas conveying, and a pulverized coal pressurizing and conveying system behind is the same as gravity blanking conveying. The coal grinding and drying unit and the low-pressure air conveying unit in the pulverized coal preparation system are generally arranged in an independent frame, so that the total height of the frame can be effectively reduced, and the number of standby equipment is reduced.

One generalization is made to the disadvantages of the prior art:

(1) The gravity blanking conveying scheme requires that the coal grinding drying units and the gasification units are in one-to-one correspondence, and the coal grinding drying units are required to be provided with standby systems, so that the equipment investment is high; meanwhile, the frame is higher in height, and the civil engineering investment is higher; the coal grinding drying unit and the gasification unit are positioned on the same frame, so that the explosion-proof cost is increased.

(2) The pneumatic conveying scheme can realize remote conveying of pulverized coal, and the pulverized coal drying unit and the pulverized coal pneumatic conveying unit are arranged on the independent frames, so that the heights of the frames can be reduced, and civil engineering and equipment investment are saved; however, as the scale of the coal gasification device tends to be larger, the whole gasification device faces the problem that the fireproof area is over-limited and the explosion-proof cost is increased sharply, and the single pneumatic conveying scheme cannot meet the requirement of the large-scale pulverized coal pressurized gasification device.

For this reason, there is an urgent need in the art to solve the following problems:

(1) The pulverized coal pressurizing and gasifying device tends to be larger and larger, and when the pulverized coal preparation system is arranged on the gasifying frame, the area of a fireproof partition is easy to overrun (the total occupied area cannot exceed 3500 square meters);

(2) The pulverized coal pressurized gasification device belongs to a class A production device, and when a pulverized coal preparation system is arranged on a gasification frame, the explosion-proof grades are all selected to be higher, so that the equipment and instrument cost is higher;

(3) When the pulverized coal preparation system is arranged on the gasification frame, the frame is high in height and high in civil engineering cost.

Disclosure of Invention

In view of the foregoing problems with the prior art, the present disclosure provides a pulverizing system adapted for a large-sized pulverized coal pressurized gasification device, arranged according to an explosion-proof level, and capable of avoiding an overrun of a fireproof partition area.

In order to achieve the above purpose, the technical scheme adopted by the embodiment of the invention is as follows:

a pulverizing system comprises a coal grinding and drying unit; the powder process system also comprises a low-pressure dense phase conveying unit and a high-pressure dense phase conveying unit which are integrally arranged, wherein: the low pressure dense phase conveying unit includes: the middle bin, the low-pressure dense-phase powder pump and the low-pressure carbon dioxide system; the low-pressure dense-phase powder pump and the low-pressure carbon dioxide system are respectively communicated with the outlet of the intermediate bin through respective outlets; the high-pressure dense phase conveying unit includes: the pulverized coal storage bin, the pulverized coal pressurizing lock hopper, the pulverized coal pressurizing feed tank and the high-pressure carbon dioxide system are sequentially communicated; the high-pressure carbon dioxide system is respectively communicated with the pulverized coal pressurizing lock hopper, the pulverized coal pressurizing feed tank and the pulverized coal pipeline; the coal grinding and drying unit is communicated with the middle bin of the low-pressure dense-phase conveying unit; the low-pressure dense-phase powder pump of the low-pressure dense-phase conveying unit is communicated with the pulverized coal storage bin of the high-pressure dense-phase conveying unit through a powder conveying pipeline; and the pulverized coal pressurizing feeding tank of the high-pressure dense-phase conveying unit is communicated with a gasification furnace burner of a downstream device through a pulverized coal pipeline.

In some embodiments of the present disclosure, the coal grinding and drying unit includes: the raw material coal storage bin, the weighing coal feeder, the coal mill, the bag filter, the circulating fan, the inert gas generator and the fiber separator are sequentially communicated; the outlet of the inert gas generator is communicated with the coal mill; the bag filter communicates with the fiber separator through its bottom outlet.

In some embodiments of the present disclosure, the fiber separator of the coal grinding and drying unit is in communication with the intermediate bin of the low pressure dense phase conveying unit.

In some embodiments of the present disclosure, the low pressure dense phase transfer unit further comprises a backup line and a side-by-side reversing valve; wherein the standby pipeline and the powder feeding pipeline are arranged in parallel and are provided with reversing valves; and two ends of the standby pipeline are respectively communicated with the low-pressure dense-phase powder pump and the pulverized coal storage bin.

In some embodiments of the present disclosure, the high pressure dense phase conveying unit further comprises a pulverized coal silo filter in sequential communication with the pulverized coal silo and the pulverized coal pressurization lock, and forming a closed loop.

In some embodiments of the present disclosure, the low pressure carbon dioxide system further comprises a low pressure carbon dioxide buffer tank; the low-pressure carbon dioxide buffer tank is communicated with low-pressure carbon dioxide equipment through an inlet of the low-pressure carbon dioxide buffer tank, and an outlet of the low-pressure carbon dioxide buffer tank is communicated with an inlet of the low-pressure dense-phase powder pump.

In some embodiments of the disclosure, the low pressure dense phase powder pump further comprises an air inlet parent pipe, the air inlet parent pipe being provided at an inlet end of the low pressure dense phase powder pump; the low-pressure carbon dioxide buffer tank is communicated with the low-pressure dense-phase powder pump through the gas inlet main pipe.

In some embodiments of the disclosure, the coal grinding and drying unit further comprises a main pipe; the main pipe is communicated with a sealing air inlet of the coal mill; the coal mill is connected with external low-pressure inert gas through the main pipe.

In some embodiments of the disclosure, the pulverized coal silo, the pulverized coal pressurization lock hopper are both in communication with the pulverized coal pressurization feed tank; the top of the pulverized coal pressurizing feed tank is provided with a plurality of blanking inlets.

Compared with the prior art, the invention has the beneficial effects that:

according to the pulverizing system, the pulverized coal drying units, the low-pressure dense-phase conveying units and the high-pressure dense-phase conveying units with the same fireproof grade are arranged in the same pulverizing frame together based on the design concept of the pulverizing island, so that the problem that the area of a fireproof partition of a gasification device is over-limited can be effectively avoided, the frame height is reduced, the equipment investment is reduced, and the large-scale design of the pulverized coal pressurizing gasification device is realized.

Drawings

Fig. 1 is a schematic structural view of a pulverizing system according to an embodiment of the present invention;

fig. 2 is a schematic diagram of connection relations of the pulverizing system in a plurality of series states according to an embodiment of the present invention.

Description of the reference numerals

1-a raw material coal storage bin; 2-weighing a coal feeder; 3-coal mill; 4-bag filters;

5-a circulating fan; 6-an inert gas generator; 7-a fiber separator; 8-an intermediate bin;

9-a low-pressure dense-phase powder pump; 10-a low pressure carbon dioxide system; 11-a reversing valve 12-a pulverized coal storage bin;

13-pulverized coal pressurization lock hopper; 14-a pulverized coal pressurizing feed tank 15-a pulverized coal storage filter;

16-high pressure carbon dioxide system

Detailed Description

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings, but not limiting the invention. In order to better understand the technical solutions of the present disclosure, the following detailed description of the present disclosure is provided with reference to the accompanying drawings and the specific embodiments. Embodiments of the present disclosure will be described in further detail below with reference to the drawings and specific embodiments, but not by way of limitation of the present disclosure.

All terms (including technical or scientific terms) used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

The terms "low pressure" and "high pressure" are used in the present invention, wherein the low pressure dense phase transfer unit, the low pressure carbon dioxide system, the high pressure dense phase transfer unit, the high pressure carbon dioxide system, etc. are words commonly used in the art, respectively. For example, "low pressure" and "high pressure" in the low pressure carbon dioxide system and the high pressure carbon dioxide system are denoted as "0.4 to 0.8MPaG" and "7 to 8MPaG", respectively, and the same applies below.

At present, as pulverized coal pressurizing and gasifying devices tend to be more and more large, when a pulverized coal preparation system is arranged on a gasifying frame, the area of a fireproof partition is easy to overrun (the total occupied area cannot exceed 3500 square meters); and because the pulverized coal pressurized gasification device belongs to a class A production device, when the pulverized coal preparation system is arranged on the gasification frame, the explosion-proof grades are all selected to be higher, so that the equipment and instrument cost is higher; to this end, the invention provides the following solution.

A pulverizing system, see fig. 1, comprising a coal pulverizing and drying unit; the powder process system also comprises a low-pressure dense phase conveying unit and a high-pressure dense phase conveying unit which are integrally arranged, wherein: the low pressure dense phase conveying unit includes: an intermediate bin 8, a low-pressure dense-phase powder pump 9 and a low-pressure carbon dioxide system 10; the low-pressure dense-phase powder pump 9 and the low-pressure carbon dioxide system 10 are respectively communicated with the outlet of the intermediate bin through respective outlets; the high-pressure dense phase conveying unit includes: the pulverized coal storage bin 12, the pulverized coal pressurizing lock hopper 13, the pulverized coal pressurizing feed tank 14 and the high-pressure carbon dioxide system 16 are sequentially communicated; the high-pressure carbon dioxide system 16 is respectively communicated with the pulverized coal pressurizing lock hopper 13, the pulverized coal pressurizing feed tank 14 and a pulverized coal pipeline; the coal grinding and drying unit is communicated with the middle bin 8 of the low-pressure dense-phase conveying unit; the low-pressure dense-phase powder pump 9 of the low-pressure dense-phase conveying unit is communicated with the pulverized coal storage bin 12 of the high-pressure dense-phase conveying unit through a powder conveying pipeline; the pulverized coal pressurizing feed tank 14 of the high-pressure dense-phase conveying unit is communicated with a gasification furnace burner of a downstream device through a pulverized coal pipeline.

Through the design scheme of the embodiment, the coal grinding drying unit, the low-pressure dense-phase conveying unit and the high-pressure dense-phase conveying unit are arranged in the same pulverizing frame together, so that the frame height can be effectively reduced, and the investment is reduced; as the coal grinding drying unit, the low-pressure dense phase conveying unit and the high-pressure dense phase conveying unit belong to class B devices, the equipment and instrument cost is relatively reduced. In addition, as the three units are arranged separately from the gasification unit (not shown in the figure), the overlimit of the area of the fireproof partition of the gasification device can be effectively avoided, the fireproof and shockproof functions of the frame are facilitated, and the large-scale design of the pulverized coal pressurized gasification device is also facilitated. The three units are arranged in the same frame together, so that the advantage of the design concept of the powder making island is fully reflected. And the devices in the powder making island frame are class B production devices, so that the area of a class A factory building of the original gasification device is reduced, and the explosion-proof requirement and the related investment are reduced.

Further, in the present embodiment, the low-pressure dense-phase transporting unit preferentially uses carbon dioxide as a transporting medium. For example, the waste carbon dioxide discharged by the post-process system of the factory can be recycled, so that the recycling of the waste carbon dioxide is realized, the emission of greenhouse gases is reduced, and corresponding contribution is made to carbon emission and carbon peaks.

In one embodiment, referring to fig. 1, the coal grinding and drying unit includes: a raw material coal storage bin 1, a weighing coal feeder 2, a coal mill 3, a bag filter 4, a circulating fan 5, an inert gas generator 6 and a fiber separator 7 which are sequentially communicated; the outlet of the inert gas generator 6 is communicated with the coal mill 3; the bag filter 4 communicates with the fiber separator 7 through its bottom outlet. Further, the fiber separator 7 of the ground coal drying unit is communicated with the intermediate bin 8 of the low-pressure dense phase conveying unit. In the embodiment, the pulverized coal of the pulverized coal drying unit, which passes through the outlet of the fiber separator 7, directly falls into the middle bin of the low-pressure dense-phase conveying unit under the action of gravity, and is conveyed to the high-pressure dense-phase conveying unit through the low-pressure dense-phase powder pump 9 and the powder conveying pipeline, and by the arrangement mode, the flow is compact and simple.

In an embodiment, referring to fig. 1 and 2, the low-pressure dense phase conveying unit further comprises a spare line and a reversing valve 11 arranged in parallel; wherein, the standby pipeline and the powder feeding pipeline are arranged in parallel and are provided with reversing valves 11; the two ends of the standby pipeline are respectively communicated with the low-pressure dense-phase powder pump 9 and the pulverized coal storage bin 12. In the prior art, a coal grinding and drying unit generally comprises more mechanical equipment, and the accident rate is higher because coal is easy to block equipment and pipelines. In particular, in the conventional design, one or more spare devices are generally needed to meet the requirements of production capacity and production safety. In the embodiment, the reversing valve and the standby pipeline can be used for completely replacing standby equipment through the intermediate bin and the powder feeding pipeline with the reversing valve in the low-pressure dense-phase conveying unit, and only the design allowance of the coal grinding drying unit is required to be amplified to a certain extent and planned alternate maintenance is required. Through the design mode of the embodiment, equipment is not needed for the coal grinding and drying unit, so that the standby rate of the coal grinding and drying unit is effectively reduced, and the equipment investment and the occupied area are greatly reduced. Meanwhile, the design scheme has the beneficial effects of flexible operation and low maintenance cost, and can improve the stability and reliability of the system.

In this embodiment, the expansion can be performed based on the above design manner. For example, fig. 2 is a schematic diagram of connection relations of the pulverizing system in a multi-series state, which shows three production lines, and shows connection relations of spare lines of the three production lines. In practical application, the method is not limited to three production lines, and the spare lines of the production lines can be expanded and designed according to the connection relation, and the method is not limited further and can be adjusted according to practical needs.

In one embodiment, referring to FIG. 1, the high pressure dense phase conveying unit further includes a pulverized coal silo filter 15 in sequential communication with the pulverized coal silo 12 and the pulverized coal pressurization lock 13 and forming a closed loop. Further, through the design scheme of this embodiment, the pulverizing system discharges after the pressure release, and the carbon dioxide gas that contains fine coal is filtered through fine coal silo filter 15, and the fine coal after filtering falls into fine coal silo 12 through the pipe once more, avoids fine coal to leak and causes the pollution to the environment, sees that this design scheme is of value to the environmental protection, and saves the raw materials cost that is used for gasification reaction.

In one embodiment, referring to FIG. 1, the low pressure carbon dioxide system 10 further comprises a low pressure carbon dioxide buffer tank; the low-pressure carbon dioxide buffer tank is communicated with an external low-pressure carbon dioxide device (not shown in the figure) through an inlet thereof, and an outlet of the low-pressure carbon dioxide buffer tank is communicated with an inlet of the low-pressure dense phase powder pump 9.

In an embodiment, referring to fig. 1, the low-pressure dense-phase powder pump 9 further includes an air inlet main pipe, and the air inlet main pipe is disposed at an inlet end of the low-pressure dense-phase powder pump 9; the low-pressure carbon dioxide buffer tank is communicated with the low-pressure dense-phase powder pump 9 through the gas inlet main pipe. In this implementation, through setting up the mother pipe of putting into, can be according to the demand of production productivity access a plurality of low pressure carbon dioxide buffer tanks, need not to set up other corollary equipment, and then save equipment and open the cost.

In one embodiment, referring to fig. 1, the coal grinding and drying unit further includes a main pipe; the main pipe is communicated with a sealed air inlet of the coal mill 3; the coal mill 3 is connected with external low-pressure inert gas through the main pipe. In this embodiment, the sealed air path of the coal mill is designed by a main pipe, that is, the sealed air path is communicated with sealed air inlets of different series of coal mills through a main pipe, so as to access external low-pressure inert gas, such as carbon dioxide or nitrogen. The purpose of the sealed air path is to ensure the sealing of the bearing of the coal mill and avoid the entry of dust or other impurities. In the traditional design, each coal mill is matched with one sealing fan, and the scheme of the embodiment of the invention can replace the use of a plurality of sealing fans. By the design scheme of the embodiment, investment and occupied area can be saved, and maintenance cost is reduced.

In one embodiment, referring to FIG. 1, the pulverized coal silo and the pulverized coal pressurization lock are both in communication with the pulverized coal pressurization feed tank; the top of the pulverized coal pressurizing feed tank is provided with a plurality of blanking inlets. By this arrangement, a plurality of relevant devices can be connected as required, for example, other pulverized coal silos and the like.

For further understanding of the design concept of the technical solution of the present invention, a brief description is made below for the working flow of the pulverizing system:

1. the raw material coal is gravity-blanked into a coal mill 3 for grinding through a raw material coal storage bin 1 and a weighing coal feeder 2;

2. pulverized coal ground by the coal mill 3 is dried by dry hot air from the inert gas generator 6 and sent to the bag filter 4;

3. the inert gas passing through the outlet of the bag filter 4 is pressurized by the circulating fan 5 and then returns to the inert gas generator 6 for heating and recycling;

4. the pulverized coal in the ash bucket of the bag filter 4 is gravity fed into a fiber separator 7, and is sent to a low-pressure dense phase conveying unit after being treated;

5. the pulverized coal from the pulverized coal drying unit falls into the intermediate bin 8, and falls into the low-pressure dense-phase powder pump 9 from the intermediate bin 8 under the action of gravity;

6. the low-pressure carbon dioxide from the low-pressure carbon dioxide system 10 simultaneously enters the low-pressure dense-phase powder pump 9, and the pulverized coal is sent into a powder feeding pipeline in a plug flow mode and enters a pulverized coal storage bin 12 of the high-pressure dense-phase conveying unit through the powder feeding pipeline;

7. the pulverized coal storage bin 12 receives pulverized coal from a powder feeding pipeline of the low-pressure dense-phase conveying unit, is pressurized by the pulverized coal pressurizing lock hopper 13 and the pulverized coal pressurizing feed tank 14, and is conveyed to a gasifier burner through the pulverized coal pipeline by taking high-pressure carbon dioxide gas sent by the high-pressure carbon dioxide system 16 as a medium; up to this point, the upstream initial raw material production is completed; the mixed pulverized coal completes the subsequent flow in the gasification furnace, and the subsequent flow part is not further described herein;

8. the carbon dioxide gas containing pulverized coal after the system pressure relief is filtered by a pulverized coal storage bin filter 15 and then discharged, and the filtered pulverized coal circularly falls into a pulverized coal storage bin 12 through a pipeline.

Furthermore, although illustrative embodiments are described herein, the scope includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of schemes across various embodiments), adaptations or alterations based on the present disclosure. Elements in the claims will be construed broadly based on the language used in the claims and not limited to examples described in the specification or during the lifetime of the application. Furthermore, the steps of the disclosed methods may be modified in any manner, including by reordering steps or inserting or deleting steps. It is intended, therefore, that the description be regarded as examples only, with a true scope being indicated by the following claims and their full range of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other. Other embodiments may be used by those of ordinary skill in the art after reading the above description. Moreover, in the foregoing detailed description, various features may be grouped together to simplify the present disclosure. This should not be interpreted as intending that an unclaimed disclosed feature is essential to any claim. Thus, the following claims are incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with one another in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

Claims (9)

1. A pulverizing system comprises a coal grinding and drying unit; the device is characterized by further comprising a low-pressure dense phase conveying unit and a high-pressure dense phase conveying unit which are integrally arranged, wherein:

the low pressure dense phase conveying unit includes:

an intermediate bin (8), a low-pressure dense-phase powder pump (9) and a low-pressure carbon dioxide system (10); the low-pressure dense-phase powder pump (9) and the low-pressure carbon dioxide system (10) are respectively communicated with the outlet of the intermediate bin through respective outlets;

the high-pressure dense phase conveying unit includes:

the pulverized coal storage bin (12), the pulverized coal pressurizing lock hopper (13), the pulverized coal pressurizing feed tank (14) and the high-pressure carbon dioxide system (16) are sequentially communicated; the high-pressure carbon dioxide system (16) is respectively communicated with the pulverized coal pressurizing lock hopper (13) and the pulverized coal pressurizing feed tank (14) and a pulverized coal pipeline;

the coal grinding and drying unit is communicated with an intermediate bin (8) of the low-pressure dense-phase conveying unit; the low-pressure dense-phase powder pump (9) of the low-pressure dense-phase conveying unit is communicated with the pulverized coal storage bin (12) of the high-pressure dense-phase conveying unit through a powder conveying pipeline; the pulverized coal pressurizing feed tank (14) of the high-pressure dense-phase conveying unit is communicated with a gasification furnace burner of a downstream device through a pulverized coal pipeline.

2. The pulverizing system of claim 1, wherein the coal pulverizing and drying unit comprises:

the raw material coal storage bin (1), the weighing coal feeder (2), the coal mill (3), the bag filter (4), the circulating fan (5), the inert gas generator (6) and the fiber separator (7) are sequentially communicated; the outlet of the inert gas generator (6) is communicated with the coal mill (3); the bag filter (4) communicates with the fiber separator (7) through its bottom outlet.

3. A pulverizing system according to claim 2, wherein the fibrous separator (7) of the coal pulverizing and drying unit is in communication with the intermediate bin (8) of the low pressure dense phase conveying unit.

4. A milling system according to claim 1, wherein the low pressure dense phase conveying unit further comprises a backup line and a side-by-side reversing valve (11); wherein,,

the standby pipeline and the powder feeding pipeline are arranged in parallel and are provided with reversing valves (11);

and two ends of the standby pipeline are respectively communicated with the low-pressure dense-phase powder pump (9) and the pulverized coal storage bin (12).

5. A pulverizing system according to claim 1, wherein the high pressure dense phase conveying unit further comprises a pulverized coal silo filter (15) in sequential communication with the pulverized coal silo (12) and the pulverized coal pressurization lock (13) and forming a closed circuit.

6. The milling system according to claim 1, wherein the low pressure carbon dioxide system (10) further comprises a low pressure carbon dioxide buffer tank; the low-pressure carbon dioxide buffer tank is communicated with low-pressure carbon dioxide equipment through an inlet of the low-pressure carbon dioxide buffer tank, and an outlet of the low-pressure carbon dioxide buffer tank is communicated with an inlet of the low-pressure dense-phase powder pump (9).

7. A milling system according to claim 6, wherein the low pressure dense phase powder pump (9) further comprises an inlet header provided at the inlet end of the low pressure dense phase powder pump (9); the low-pressure carbon dioxide buffer tank is communicated with the low-pressure dense-phase powder pump (9) through the gas inlet main pipe.

8. The pulverizing system of claim 2, wherein said coal pulverizing and drying unit further comprises a main pipe; the main pipe is communicated with a sealed air inlet of the coal mill (3); the coal mill (3) is connected with external low-pressure inert gas through the main pipe.

9. The pulverizing system of claim 1, wherein said pulverized coal silo and said pulverized coal pressurization lock hopper are both in communication with said pulverized coal pressurization feed tank; the top of the pulverized coal pressurizing feed tank is provided with a plurality of blanking inlets.

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