CN107099338B

CN107099338B - Pulverized coal conveying device, pulverized coal gasification system and pulverized coal conveying method thereof

Info

Publication number: CN107099338B
Application number: CN201710322111.8A
Authority: CN
Inventors: 刘刚; 徐国壮; 邢浩
Original assignee: ENN Science and Technology Development Co Ltd
Current assignee: ENN Science and Technology Development Co Ltd
Priority date: 2017-05-09
Filing date: 2017-05-09
Publication date: 2020-10-20
Anticipated expiration: 2037-05-09
Also published as: CN107099338A

Abstract

The invention provides a pulverized coal conveying device, a pulverized coal gasification system and a pulverized coal conveying method thereof. The device includes: a lock hopper, a separator and a temperature rising device; the separator is used for receiving first pressure relief gas in the lock hopper and separating pulverized coal from the first pressure relief gas; a solid outlet of the separator is communicated with a feed back port of the lock hopper, and the solid outlet is used for conveying the separated pulverized coal to the lock hopper; the gas outlet of the separator is communicated with the inlet of the temperature rising device, and the temperature rising device is used for receiving the separated first pressure relief gas and rising the temperature of the first pressure relief gas; the outlet of the temperature rising device is used for outputting the first pressure relief gas after temperature rising. The first pressure relief gas can be kept at a certain temperature, so that the first pressure relief gas is prevented from being condensed to block a pipeline due to low temperature generated by pressure drop, and the normal operation of pulverized coal conveying is ensured.

Description

Pulverized coal conveying device, pulverized coal gasification system and pulverized coal conveying method thereof

Technical Field

The invention relates to the technical field of pressurized conveying, in particular to a pulverized coal conveying device, a pulverized coal gasification system and a pulverized coal conveying method thereof.

Background

Along with the increasing scarcity of petroleum and natural gas resources, the clean utilization of coal is more and more emphasized by people, and the development of large-scale coal gasification technology is the key point for clean utilization of coal resources. Among large-scale coal gasification technologies, entrained-flow coal gasification technologies have attracted attention. Among them, entrained flow pulverized coal pressure gasification has been widely used due to the advantages of wide coal type adaptability, high conversion rate, etc.

The pressurized conveying of the pulverized coal is the core technology of the pulverized coal gasification process, and the most important is whether the pulverized coal feeding is stable or not, and the stability of the feeding directly influences the gasification efficiency and the system safety. At present, the flow of the pulverized coal pressurized conveying process is as follows: and boosting the pressure of the pulverized coal and the carrier gas from the coal grinding and drying sections in a pressurizing lock hopper, conveying the pulverized coal to a high-pressure section after the pressure boosting is finished, and decompressing the pressurizing lock hopper, so that the carrier gas in the pressurizing lock hopper is subjected to low-pressure bag dust remover to filter the pulverized coal carried in the carrier gas, and the filtered pulverized coal is conveyed to the pressurizing lock hopper again through a low-pressure storage tank, and the circulation is carried out. However, the pressurizing lock hopper can discharge high-pressure carrier gas in the pressure relief process, and the carrier gas is carbon dioxide gas, so the carrier gas can cause strong temperature drop due to strong throttling effect, so that the phenomenon of pressure reduction and condensation of carbon dioxide and pulverized coal in the conveying process is caused, a conveying pipeline is easily blocked, and further the conveying of the pulverized coal is influenced.

Disclosure of Invention

In view of this, the invention provides a pulverized coal conveying device, and aims to solve the problem that a conveying pipeline is blocked due to the fact that carrier gas is prone to depressurization and condensation in the pressure relief process of a pressurization lock bucket in the prior art. The invention also provides a pulverized coal gasification system and a pulverized coal conveying method.

In one aspect, the present invention provides a pulverized coal conveying apparatus, comprising: a lock hopper, a separator and a temperature rising device; the separator is used for receiving first pressure relief gas in the lock hopper and separating pulverized coal from the first pressure relief gas; a solid outlet of the separator is communicated with a feed back port of the lock hopper, and the solid outlet is used for conveying the separated pulverized coal to the lock hopper; the gas outlet of the separator is communicated with the inlet of the temperature rising device, and the temperature rising device is used for receiving the separated first pressure relief gas and rising the temperature of the first pressure relief gas; the outlet of the temperature rising device is used for outputting the first pressure relief gas after temperature rising.

Further, in the pulverized coal conveyor, the temperature raising device is a mixer; the first inlet of the mixer is communicated with the gas outlet of the separator through a first pipeline, and the first inlet of the mixer is used for receiving first pressure relief gas; the second inlet of the mixer is used for receiving a first make-up gas with a preset temperature, and the outlet of the mixer is used for outputting a mixed gas obtained by mixing the first pressure relief gas with the first make-up gas.

Further, the pulverized coal conveyor further includes: a second conduit; the separator is used for receiving second pressure relief gas in the lock hopper and separating pulverized coal from the second pressure relief gas; the second pipeline is communicated with the first pipeline and used for receiving and outputting second pressure relief gas.

Further, in the pulverized coal transporting device, the separator is disposed above the lock hopper.

Further, in the pulverized coal conveying device, a solid outlet of the separator is communicated with a feed back port of the lock hopper through a feed pipe; the side wall of the blanking pipe is provided with an air inlet, and the air inlet is used for inputting air which drives pulverized coal in the blanking pipe to return to the lock hopper into the blanking pipe.

Further, the pulverized coal conveyor further includes: a first bypass line, a first valve and a second valve; wherein, the pressure relief port of the lock hopper is communicated with the material inlet of the separator through a first valve; the pressure relief port of the lock hopper is also communicated with the first pipeline sequentially through the second valve and the first bypass pipeline, and the pipeline where the first valve and the separator are located and the pipeline where the second valve and the first bypass pipeline are located are parallel pipelines.

Further, the pulverized coal conveyor further includes: a voltage regulator; wherein, the opening of voltage regulator is linked together with the pressure regulating mouth of lock fill, and the voltage regulator is used for adjusting the pressure in the lock fill.

Further, in the above pulverized coal transporting device, the pressure regulator includes: a housing; the shell is provided with a first opening and a second opening, and the first opening is communicated with a pressure regulating port of the lock bucket; the first opening is used for receiving pressurized gas in the lock hopper when the pressure of the lock hopper is greater than the preset pressure; the second opening is used for outputting the pressurized gas; the second opening is also used for receiving second supplementary air when the pressure of the lock hopper is smaller than the preset pressure; the first opening is also used to deliver a second make-up gas into the lock hopper.

Further, in the above pulverized coal conveyor, the pressure regulator further includes: a filter body; wherein, the filter body is connected to the inner wall of the shell.

Further, the pulverized coal conveyor further includes: a second bypass line, a third valve, and a fourth valve; the pressure regulating port of the lock hopper is communicated with the opening of the pressure regulator through a third valve; the pressure regulating port of the lock bucket is communicated with the second bypass pipeline through a fourth valve, and the pipeline where the third valve and the pressure regulator are located and the pipeline where the fourth valve and the second bypass pipeline are located are parallel pipelines.

According to the invention, the pulverized coal is separated from the first pressure relief gas through the separator, and the first pressure relief gas is conveyed to the heating device for heating, so that the first pressure relief gas can keep a certain temperature, the first pressure relief gas is prevented from condensing and blocking a pipeline due to low temperature generated by pressure drop, the normal operation of pulverized coal conveying is ensured, and the problem that the conveying pipeline is blocked due to the fact that the carrier gas is easy to condense due to pressure drop in the pressure relief process of the pressurizing lock hopper in the prior art is solved.

In another aspect, the present invention further provides a pulverized coal gasification system, including: the pulverized coal pressurized conveying device.

As the pulverized coal conveying device has the effects, the pulverized coal gasification system with the pulverized coal conveying device also has corresponding technical effects.

In another aspect, the present invention further provides a method for conveying pulverized coal, including the following steps: a separation step, namely conveying the pressure relief gas in the lock hopper to a separator, and separating the pressure relief gas from the pulverized coal carried by the pressure relief gas by the separator; a temperature rising step, wherein the separator conveys the separated pressure relief gas to a temperature rising device for rising the temperature; an output step, in which the temperature rising device outputs the pressure relief gas after temperature rising

Further, in the pulverized coal conveying method, in the temperature increasing step, the temperature increasing device is a mixer, and make-up air with a preset temperature is input into the mixer and mixed with the pressure relief air.

Further, in the above-described pulverized coal conveying method, in the separating step, the separator conveys the separated pulverized coal to the lock hopper.

According to the invention, the pulverized coal is separated from the pressure relief gas through the separator, and the pressure relief gas is heated in the heating device, so that the pressure relief gas can keep a certain temperature, the pipeline blockage caused by condensation due to low temperature generated by pressure drop of the pressure relief gas is prevented, and the normal operation of pulverized coal conveying 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 schematic structural diagram of a pulverized coal conveying apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of another embodiment of a pulverized coal conveyor according to the present invention;

FIG. 3 is a flow chart of a method of conveying pulverized coal according to an 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 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 embodiments with reference to the attached drawings.

Pulverized coal conveying device

Referring to fig. 1, fig. 1 is a schematic structural diagram of a pulverized coal conveying device according to an embodiment of the present invention. As shown, the pulverized coal conveying apparatus includes: a lock hopper 1, a separator 2, a mixer 4 and a temperature rising device 16. Wherein, the separator 2 is provided with a material inlet 21 and a solid outlet 23. The pressure relief port 110 of the lock hopper 1 is communicated with the material inlet 21 of the separator 2, and the separator 2 is used for receiving first pressure relief gas in the lock hopper 1 and separating pulverized coal from the first pressure relief gas. The solid outlet 23 of the separator 2 is communicated with the feed back port 120 of the lock hopper 1, and the solid outlet 23 is used for conveying the separated pulverized coal into the lock hopper 1. In particular, the solids outlet 23 of the separator 2 may open at the bottom of the separator 2 (with respect to fig. 1). The separator 2 may be a cyclone separator, or may be another separator, which is not limited in this embodiment.

The separator 2 is further provided with a gas outlet 22, the gas outlet 22 of the separator 2 is communicated with an inlet 161 of the temperature rising device 16, the temperature rising device 16 is used for receiving the first pressure relief gas after the pulverized coal is separated out, and raises the temperature of the first pressure relief gas, so that the first pressure relief gas reaches a preset temperature, and an outlet 162 of the temperature rising device 16 is used for outputting the first pressure relief gas after the temperature is raised. In a specific implementation, the temperature increasing device 16 may be a heating device, and of course, may be another device as long as it can increase the temperature of the first relief gas, which is not limited in this embodiment.

It should be noted that, as will be understood by those skilled in the art, the lock hopper 1 is provided with a pressurized gas inlet 150, a pulverized coal inlet 130 and a pulverized coal outlet 140, the pulverized coal is conveyed into the lock hopper 1 through the pulverized coal inlet 130, and the pressurized gas is conveyed into the lock hopper 1 through the pressurized gas inlet 150, wherein the pressurized gas has a preset pressurized temperature and a preset pressure. In the lock hopper 1, the pressurized gas pressurizes the pulverized coal, so that the pressure of the pulverized coal is increased. When the pulverized coal is pressurized to a preset pressure, the pressurized pulverized coal is output to a subsequent system through a pulverized coal discharge hole 140. The lock hopper 1 is further provided with a pressure relief opening 110 and a material return opening 120, and after the pressurized pulverized coal is output from the lock hopper 1, the pressurized gas in the lock hopper 1 is the pressure relief gas, and the pressure relief gas is output from the pressure relief opening 110. The pressure relief gas often carries pulverized coal in the output process, and the pulverized coal is separated from the pressure relief gas and then flows back to the lock hopper 1 through the feed back port 120.

It should be understood by those skilled in the art that a pipe should be connected to the pulverized coal discharging port 140 of the lock hopper 1. The pipe may be provided with a discharge valve which is closed when the lock hopper 1 is pressurized. The pipeline can be not provided with a blanking valve, and a subsequent system also boosts pressure in the boosting process of the lock hopper 1 so as to maintain the pressure in the lock hopper 1.

The working process is as follows: the pulverized coal is conveyed into the lock hopper 1 from the pulverized coal feed inlet 130, and when the pulverized coal in the lock hopper 1 reaches a specified material level, the pulverized coal feeding is stopped. Pressurized gas having a preset pressurized temperature and a preset pressure is delivered into the lock hopper 1 through the pressurized gas input port 150. In the lock hopper 1, the pressurized gas pressurizes the pulverized coal, so that the pressure of the pulverized coal is increased. When the pulverized coal is pressurized to a preset pressure, the pressurized pulverized coal is output from the pulverized coal discharge port 140. The pressurized gas in the lock hopper 1 is the pressure relief gas, and since the pressure in the lock hopper 1 is higher after the lock hopper 1 outputs the pressurized pulverized coal, the pressure relief gas with higher pressure in the lock hopper 1 is referred to as the first pressure relief gas. First pressure release gas is exported to separator 2 by pressure release mouth 110 in, and separator 2 separates the fine coal that first pressure release gas and first pressure release gas carried, and the fine coal of separating is carried to lock fill 1 in through separator 2's solid export 23 to carry out follow-up utilization to fine coal. The separated first pressure relief gas is output to the temperature increasing device 16 from the gas outlet 22 of the separator 2, and the temperature increasing device 16 increases the temperature of the first pressure relief gas, so that the first pressure relief gas reaches a preset temperature. Then, the first pressure relief gas reaching the preset temperature is output through the outlet 162 of the temperature increasing device 16. In specific implementation, the first pressure relief gas after temperature rise can be recycled.

In a specific implementation, the pressurized gas may be carbon dioxide, and of course, other inert gases may also be used, which is not limited in this embodiment. The preset pressurizing temperature and the preset pressure of the pressurizing gas may be determined according to actual conditions, and the present embodiment does not limit this. In this embodiment, the pressurized gas is carbon dioxide, the temperature of the pressurized gas is 100 ℃ to 140 ℃, and the pressure is 8.1MPa to 8.5 MPa. Preferably, the temperature of the pressurized gas is 100 ℃ and the pressure is 8.2 MPa. The preset pressure reached by the pulverized coal pressurization can be determined according to actual conditions, and the embodiment does not limit the preset pressure.

It can be seen that, in this embodiment, isolate fine coal from first pressure release gas through separator 2, first pressure release gas carries and heaies up to 16 in the rising temperature device for first pressure release gas can keep certain temperature, has prevented that first pressure release gas from producing the low temperature because of the pressure drop and leading to condensing and block up the pipeline, has ensured fine coal transportation's normal operating, has solved the problem that pressurization lock fill among the prior art easily appears the decompression at pressure release in-process carrier gas and condenses and lead to the pipeline jam.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a pulverized coal conveying device according to an embodiment of the present invention. In the above embodiment, the temperature increasing device 16 may be a mixer 4, and the first inlet 41 of the mixer 4 is communicated with the gas outlet 22 of the separator 2 through the first pipe 5, and the first inlet 41 of the mixer 4 is used for receiving the first pressure relief gas. The second inlet 42 of the mixer 4 is adapted to receive a first make-up gas having a preset temperature. The mixer 4 is used for mixing the first pressure relief gas and the first make-up gas to form a mixed gas, so that the temperature of the mixed gas reaches a preset temperature. The outlet 43 of the mixer 4 is used for outputting the mixed gas obtained by mixing the first pressure relief gas and the first make-up gas. Specifically, the gas outlet 22 of the separator 2 is used for conveying clean first pressure relief gas after the pulverized coal is separated out to the first pipeline 5, and the first pipeline 5 conveys the first pressure relief gas to the mixer 4. In specific implementation, the preset temperature of the first make-up air may be determined according to actual conditions, for example, the preset temperature is greater than 100 ℃, and the embodiment does not limit this. The gas amount of the first make-up gas is determined according to the gas amount of the first pressure relief gas, so that the temperature of the mixed gas is guaranteed to reach the preset temperature, and in the embodiment, the temperature of the mixed gas is guaranteed to reach more than 80 ℃.

In a specific implementation, the first supplementary gas may be carbon dioxide, or may be other gases, and this embodiment does not limit this. In this embodiment, because the pressurization gas is carbon dioxide, so, first pressure release gas is carbon dioxide, and first make-up gas also is carbon dioxide, has guaranteed the purity of carbon dioxide effectively, is convenient for recycle.

It can be seen that, in this embodiment, rising temperature device 16 is blender 4, mixes first pressure release gas and the first make-up gas that has preset temperature through in blender 4, and the temperature transmission of first make-up gas is for first pressure release gas for the gas mixture after first make-up gas and the mixing of first pressure release gas can reach preset temperature, prevents that first pressure release gas from producing the phenomenon that the low temperature leads to condensing and blocks up the pipeline because of the pressure drop, has ensured fine coal transportation's normal operating.

With continued reference to FIG. 2, in the above embodiments, the pulverized coal conveying device may further include: a second conduit 6. The separator 2 is used for receiving second pressure relief gas in the lock hopper 1 and separating pulverized coal from the second pressure relief gas. The second pipeline 6 is communicated with the first pipeline 5, and the second pipeline 6 is used for receiving and outputting second pressure relief gas. Specifically, along with constantly exporting the higher first pressure release gas of pressure in the lock fill 1, the pressure in the lock fill 1 reduces gradually, and then the pressure of the pressure release gas in the lock fill 1 is lower, marks the lower pressure release gas of pressure as the second pressure release gas, and the lock fill 1 carries the second pressure release gas to separator 2 in. One end (right end shown in fig. 2) of the second pipeline 6 is communicated with the first pipeline 5, and the other end (left end shown in fig. 2) of the second pipeline 6 is used for outputting the separated clean second decompression gas. In specific implementation, the second pipeline 6 can convey the second pressure relief gas to a subsequent system for recycling.

The second pipe 6 may be provided with a valve for controlling the on/off of the second pipe 6. The first pipeline 5, at the communication point with the second pipeline 6 and after the second pipeline 6, may be provided with a valve for controlling the on/off of the portion of the first pipeline 5 after the second pipeline 6, so as to better ensure that the second relief gas is delivered into the second pipeline 6 and the first relief gas is delivered into the first pipeline 5. Because the pressure of second pressure release gas is lower, so need not to set up the rising temperature device on the second pipeline 6, just also need not to carry out the temperature filling to second pressure release gas.

In specific implementation, the pressure of the first pressure relief gas may be higher than 4MPa, and the pressure of the second pressure relief gas may be lower than 4 MPa.

It can be seen that, in this embodiment, through setting up second pipeline 6, can make first pressure release gas and second pressure release gas carry through different pipelines respectively to, the pressure of second pressure release gas is lower, need not to mend the temperature, can directly carry to follow-up system in, has saved the consumption of the energy.

With continued reference to FIG. 2, the present embodiment illustrates one manner in which pulverized coal is delivered to the lockhopper. The separator 2 is arranged above the lock hopper 1 (relative to fig. 2), so that the pulverized coal separated by the separator 2 can flow back into the lock hopper 1 under the action of gravity, and the device is simple, convenient and easy to operate, does not need other power mechanisms, and saves energy. In specific implementation, the separator 2 may be disposed directly above the lock hopper 1, or disposed obliquely above the lock hopper 1, as long as the pulverized coal separated in the separator 2 flows back into the lock hopper 1 under the action of gravity, which is not limited in this embodiment. Preferably, the axis of the solid outlet 23 of the separator 2 coincides with the axis of the feed back opening 120 of the lock hopper 1, that is, the solid outlet 23 of the separator 2 is positioned right above the feed back opening 120 of the lock hopper 1 (with respect to fig. 2), so that the pulverized coal is better transported into the lock hopper 1.

With continued reference to FIG. 2, another mode of delivering pulverized coal to the lockhopper is illustrated in this embodiment. The solid outlet 23 of the separator 2 is communicated with the feed back port 120 of the lock hopper 1 through the feeding pipe 3, specifically, a first end (an upper end shown in fig. 2) of the feeding pipe 3 is communicated with the solid outlet 23 of the separator 2, and a second end (a lower end shown in fig. 2) of the feeding pipe 3 is communicated with the feed back port 120 of the lock hopper 1.

The side wall of the blanking pipe 3 is provided with an air inlet 31, the air inlet 31 is used for inputting air which drives the pulverized coal in the blanking pipe 3 to return to the lock hopper 1 into the blanking pipe 3, that is, the air inlet 31 is used for inputting air into the blanking pipe 3, and the air is used for driving the pulverized coal in the blanking pipe 3 to flow back to the lock hopper 1. Preferably, the air inlet 31 is disposed near the feed back port 120 of the lock hopper 1.

In a specific implementation, the gas input by the gas inlet 31 may be carbon dioxide, or may be other gases, and this embodiment does not limit this. In the present embodiment, since the pressurized gas is carbon dioxide, the gas is also carbon dioxide in order to maintain the purity of carbon dioxide. The gas has a preset temperature and a preset pressure, and the preset temperature and the preset pressure can be determined according to actual conditions in specific implementation, which is not limited in this embodiment. In this example, the temperature of the gas was 100 ℃ to 140 ℃ and the pressure was 8.1MPa to 8.5 MPa. Preferably, the gas has a temperature of 100 ℃ and a pressure of 8.2 MPa.

It can be seen that, in this embodiment, through conveying gas in to unloading pipe 3, like this, gas can drive the fine coal backward flow in the unloading pipe 3 to the lock fill 1 in, has avoided the fine coal compaction to lead to the jam of pipeline for the speed of fine coal backward flow, simple and convenient.

With continued reference to FIG. 2, yet another mode of delivering pulverized coal to the lockhopper is illustrated in the present embodiment. The separator 2 is arranged above the lock hopper 1, an air inlet 31 is formed in the side wall of the blanking pipe 3, and the air inlet 31 is used for inputting air which drives pulverized coal in the blanking pipe 3 to return to the lock hopper 1 into the blanking pipe 3. Like this, the fine coal among separator 2 and the unloading pipe 3 flows back to in the lock fill 1 under the dual function of gravity and strength for the speed of fine coal backward flow, has avoided the fine coal compaction to lead to the jam of pipeline effectively, has ensured the normal backward flow of fine coal.

With continued reference to FIG. 2, in the above embodiments, the pulverized coal conveying device may further include: a first bypass line 7, a first valve 8 and a second valve 9. Wherein, the pressure relief port 110 of the lock hopper 1 is communicated with the material inlet 21 of the separator 2 through the first valve 8. The pressure relief port 110 of the lock hopper 1 is also communicated with the first pipeline 5 sequentially through the second valve 9 and the first bypass pipeline 7, and the pipeline where the first valve 8 and the separator 2 are located and the pipeline where the second valve 9 and the first bypass pipeline 7 are located are parallel pipelines. Specifically, the pressure relief port 110 of the lock hopper 1 is communicated with the material inlet 21 of the separator 2 through a pressure relief pipeline 14, the pipeline is provided with a first valve 8, and the first valve 8 is used for controlling the on-off of the pressure relief pipeline 14. The pressure relief port 110 of the lock hopper 1 is further communicated with the first pipeline 5 through a first bypass pipeline 7, the first bypass pipeline 7 is provided with a second valve 9, the second valve 9 is used for controlling the on-off of the first bypass pipeline 7, and then the pressure relief pipeline 14 and the first bypass pipeline 7 are parallel pipelines. In specific implementation, a first end (lower right end shown in fig. 2) of the first bypass pipe 7 is communicated with the pressure relief pipe 14, and a second end (lower left end in fig. 2) of the first bypass pipe 7 is communicated with the first pipe 5. The first valve 8 is arranged in the pressure relief duct 14 and behind the connection point of the first bypass duct 7 and the pressure relief duct 14.

It can be seen that, in this embodiment, through setting up first bypass pipeline 7, and, the pipeline that first valve 8 and separator 2 are located and the pipeline that second valve 9 and first bypass pipeline 7 are located are the parallel pipeline, like this, when separator 2 department appears blockking up, first pressure release gas or second pressure release gas can be carried to first pipeline 5 through first bypass pipeline 7 in, be convenient for follow-up the processing to first pressure release gas and second pressure release gas, the normal pressure release of lock fill 1 has been ensured effectively, and then the normal operating of fine coal conveying has been ensured.

With continued reference to FIG. 2, in the above embodiments, the pulverized coal conveying device may further include: a voltage regulator 10. Wherein, the pressure regulating mouth 160 has been seted up to the lock fill 1, and the opening of voltage regulator 10 is linked together with the pressure regulating mouth 160 of lock fill 1, and voltage regulator 10 is used for adjusting the pressure in the lock fill 1. When the powdered coal in the lock hopper 1 is pressurized, the pressure regulator 10 can regulate the pressure in the lock hopper 1, so that the powdered coal in the lock hopper 1 is pressurized to a preset pressure, and the normal pressurization of the powdered coal is ensured.

With continued reference to fig. 2, in the above embodiment, the voltage regulator 10 may include: a housing 101. The housing 101 defines a first opening 1011 and a second opening 1012, wherein the first opening 1011 is in communication with the pressure regulating port 160 of the lock bucket 1. The first opening 1011 is used for receiving the pressurized air in the lock bucket 1 when the pressure in the lock bucket 1 is greater than the preset pressure, and the second opening 1012 is used for outputting the pressurized air. That is to say, the pulverized coal and the pressurized gas are delivered into the lock hopper 1, the pressure of the pulverized coal gradually rises, when the pressure of the pulverized coal is greater than the preset pressure, the lock hopper 1 delivers part of the pressurized gas into the housing 101 of the pressure regulator 10 through the pressure regulating port 160 and the first opening 1011, and the pressure regulator 10 outputs the pressurized gas through the second opening 1012. In specific implementation, a pressure regulating pipeline 15 is arranged between the first opening 1011 and the pressure regulating port 160 of the lock hopper 1, and the pressure regulating pipeline 15 is provided with a valve.

The second opening 1012 is also used to receive a second make-up gas when the pressure in the lock hopper 1 is less than the preset pressure, and the first opening 1011 is also used to deliver the second make-up gas into the lock hopper 1. That is to say, when the pressure of fine coal in the lock hopper 1 is less than the preset pressure, the second make-up gas is conveyed to the casing 101 of the pressure regulator 10 through the second opening 1012, the pressure regulator 10 conveys the second make-up gas to the lock hopper 1 sequentially through the first opening 1011 and the pressure regulating port 160, and the second make-up gas and the pressurized gas act together, so that the fine coal reaches the preset pressure. Specifically, the second supplementary gas may be carbon dioxide, and may also be another gas, which is not limited in this embodiment. In this embodiment, the pressurized gas is carbon dioxide, and the second make-up gas is also carbon dioxide in order to maintain the purity of the carbon dioxide. The second make-up gas has a preset temperature and a preset pressure, and both the preset temperature and the preset pressure can be determined according to actual conditions in specific implementation, which is not limited in this embodiment. In this example, the temperature of the second make-up gas was 140 ℃ and the pressure was 8.2 MPa.

It can be seen that, in this embodiment, the pressure regulator 10 can reduce the pressure in the lock hopper 1 by releasing the pressurized gas from the lock hopper 1, or increase the pressure in the lock hopper 1 by delivering the second make-up gas into the lock hopper 1, so that the pressure in the lock hopper 1 can be adjusted to the preset pressure, thereby ensuring the normal pressurization of the pulverized coal, and the operation is simple and easy to implement; in addition, the second supplementary gas has a preset temperature, so that the temperature of the pulverized coal can be improved better, and the pressurized pulverized coal is ensured to have a certain temperature.

With continued reference to fig. 2, in the above embodiment, the voltage regulator 10 may further include: a filter body 102. Wherein the filter body 102 is disposed in the housing 101, the filter body 102 is connected to the inner wall of the housing 101, and the filter body 102 is disposed between the first opening 1011 and the second opening 1012. The filter body 102 is used for filtering the pressurized gas or filtering the second make-up gas, so as to play a role in removing dust, ensure that the pressurized gas and the second make-up gas are clean, and particularly avoid the pressurized gas carrying pulverized coal.

With continued reference to fig. 1, in the above embodiment, the voltage regulator 10 may further include: a second bypass conduit 11, a third valve 12 and a fourth valve 13. The pressure regulating port 160 of the lock hopper 1 is communicated with the opening of the pressure regulator 10 through the third valve 12, the pressure regulating port 160 of the lock hopper 1 is also communicated with the second bypass pipeline 11 through the fourth valve 13, and the pipeline where the third valve 12 and the pressure regulator 10 are located and the pipeline where the fourth valve 13 and the second bypass pipeline 11 are located are parallel pipelines. Specifically, the pressure regulating port 160 of the lock hopper 1 is communicated with the first opening 1011 of the pressure regulator 10 through the pressure regulating pipeline 15, the pressure regulating pipeline 15 is provided with a third valve 12, and the third valve 12 is used for controlling the on-off of the pressure regulating pipeline. The pressure regulating port 160 of the lock bucket 1 is also communicated with one end of the second bypass pipeline 11, the other end of the second bypass pipeline 11 can be opened or communicated with other equipment, a fourth valve 13 is arranged on the second bypass pipeline 11, and the fourth valve 13 is used for controlling the on-off of the second bypass pipeline 11. When the pressure regulator 10 is blocked and the pressure in the lock hopper 1 is higher than the preset pressure, the second bypass pipeline 11 is used for outputting the pressurized gas in the lock hopper 1.

In a specific implementation, one end (the lower end shown in fig. 2) of the second bypass pipeline 11 may be communicated with the pressure regulating pipeline 15, the third valve 12 is disposed on the pressure regulating pipeline 15 and behind the connection point of the second bypass pipeline 11 and the pressure regulating pipeline 15, and the fourth valve 13 is disposed on the second bypass pipeline 11.

It can be seen that, in this embodiment, through setting up second bypass pipeline 11, and, the pipeline that third valve 12 and pressure regulator 10 are located and the pipeline that fourth valve 13 and second bypass pipeline 11 are located are the parallel pipeline, like this, when pressure regulator 10 department appears blockking up, and, when the pressure in the lock fill 1 is greater than preset pressure, second bypass pipeline 11 can be with the pressurized gas output in the lock fill 1, maintain the preset pressure in the lock fill 1, and then ensured the normal operating of fine coal conveying.

In conclusion, in this embodiment, through the separator from first pressure release gas in isolate fine coal, first pressure release gas carries to heat up in the rising temperature device for first pressure release gas can keep certain temperature, has prevented that first pressure release gas from producing low temperature because of the pressure drop and leading to condensing and block up the pipeline, has ensured fine coal transportation's normal operating, has solved the problem that the pressurization lock fill among the prior art easily appears the decompression at pressure release in-process carrier gas and condenses and lead to the pipeline jam.

Pulverized coal gasification system

The invention also provides a pulverized coal gasification system. The pulverized coal gasification system may include the pulverized coal conveying device described above. The specific implementation process of the pulverized coal conveying device can be as described above, and this embodiment is not described herein again.

Method for conveying pulverized coal

The invention also provides a pulverized coal conveying method. Referring to FIG. 3, FIG. 3 is a flow chart of a method of conveying pulverized coal according to an embodiment of the present invention. As shown, the pulverized coal conveying method may include the steps of:

and a separation step S1, conveying the pressure relief gas in the lock hopper to a separator, and separating the pressure relief gas from the pulverized coal carried by the pressure relief gas by the separator.

Specifically, referring to fig. 1, the pressure relief port 110 of the lock hopper 1 communicates with the material inlet 21 of the separator 2. The pulverized coal is conveyed into the lock hopper 1 from the pulverized coal feed inlet 130 of the lock hopper 1, and when the pulverized coal in the lock hopper 1 reaches a specified material level, the pulverized coal feeding is stopped. The pressurized gas with the preset pressurizing temperature and the preset pressure is conveyed into the lock hopper 1 from the pressurized gas input port 150 of the lock hopper 1, and the pressurized gas pressurizes the pulverized coal in the lock hopper 1, so that the pressure of the pulverized coal is increased. When the pulverized coal is pressurized to a preset pressure, the pressurized pulverized coal is output from the pulverized coal discharge port 140. The pressurized gas in the lock hopper 1 is the pressure relief gas, the pressure relief gas is output to the separator 2 through the pressure relief port 110, and the separator 2 separates the pressure relief gas from the pulverized coal carried by the pressure relief gas.

And a temperature rising step S2, wherein the separator conveys the separated pressure relief gas to a temperature rising device for rising the temperature.

Specifically, referring to fig. 1, a gas outlet 22 of the separator 2 is communicated with an inlet of the temperature increasing device 16, and the gas outlet 22 is used for conveying the decompression gas separated by the separator 2 to the temperature increasing device 16. The temperature raising device 16 raises the temperature of the pressure relief gas so that the pressure relief gas reaches a preset temperature. In specific implementation, the temperature raising device 16 raises the temperature of the pressure relief gas in many ways, which is not limited in this embodiment. The preset temperature reached by the pressure relief gas can be determined according to actual conditions, and the embodiment does not limit the preset temperature.

And an output step S3, wherein the temperature rising device outputs the pressure relief gas after temperature rising.

Specifically, the temperature increasing device 16 outputs the pressure relief gas after temperature increase through an outlet 162 of the temperature increasing device 16.

It can be seen that, in this embodiment, isolate out fine coal from the pressure release gas through separator 2, the pressure release gas heaies up in rising temperature device for the pressure release gas can keep certain temperature, has prevented that the pressure release gas from producing low temperature because of the pressure drop and leading to condensing and blocking the pipeline, has ensured fine coal conveying's normal operating.

In the above embodiment, in the temperature increasing step S2, the temperature increasing device is a mixer, and the make-up air with a preset temperature is input into the mixer, and is mixed with the separated pressure relief air.

Specifically, referring to fig. 2, there are many ways for the mixer 4 to raise the temperature of the pressure relief gas, and in the present embodiment, the temperature of the pressure relief gas is raised by inputting the supplementary gas having a preset temperature into the mixer 4 and mixing the supplementary gas with the pressure relief gas. The gas outlet 22 of the separator 2 is in communication with the first inlet 41 of the mixer 4, and the gas outlet 22 is used for conveying the depressurization gas separated by the separator 2 to the mixer 4 through the first inlet 41. The second inlet 42 of the mixer 4 is adapted to receive make-up air having a predetermined temperature, and the mixer 4 mixes the bleed-off air with the make-up air so that the temperature of the mixture reaches the predetermined temperature, the mixture being output from the outlet 43 of the mixer 4.

It can be seen that, in this embodiment, temperature rising device 16 is mixer 4, and the supplementary gas that has preset temperature is carried to the mixer 4 through to the supplementary gas of carrying and is carried out the temperature to the pressure release gas, and is simple and convenient, easily operation.

In the above embodiment, in the separation step S1, the separator conveys the separated pulverized coal to the lock hopper.

Specifically, the solid outlet 23 of the separator 2 is communicated with the feed back port 120 of the lock hopper 1 through the feed pipe 3, and the separated pulverized coal is conveyed into the lock hopper 1 through the feed pipe 3 by the separator 2.

It can be seen that in this embodiment, during the fine coal of separation directly carried to lock fill 1 through unloading pipe 3, reduced fine coal circulation route, shortened process flow greatly, reduced the fine coal and to the wearing and tearing of pipeline at the transportation process, prolonged the life of pipeline, improved the efficiency that fine coal pressurized transportation.

It should be noted that the principle of the pulverized coal transporting device, the pulverized coal gasification system, and the pulverized coal transporting method in the present invention are the same, and the related points can be referred to each other.

In summary, in this embodiment, the pulverized coal is separated from the pressure relief gas through the separator, and the pressure relief gas is heated in the heating device, so that the pressure relief gas can keep a certain temperature, thereby preventing the pressure relief gas from being condensed and blocking a pipeline due to low temperature generated by pressure drop, and ensuring normal operation of pulverized coal conveying.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention 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 of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A pulverized coal conveying apparatus, comprising: the device comprises a lock hopper (1), a separator (2), a temperature raising device (16), a second pipeline (6), a first bypass pipeline (7), a first valve (8) and a second valve (9); wherein the content of the first and second substances,

the pressure relief opening (110) of the lock hopper (1) is communicated with the material inlet (21) of the separator (2), and the separator (2) is used for receiving first pressure relief gas in the lock hopper (1) and separating pulverized coal from the first pressure relief gas;

a solid outlet (23) of the separator (2) is communicated with a feed back port (120) of the lock hopper (1), and the solid outlet (23) is used for conveying the separated pulverized coal to the lock hopper (1);

a gas outlet (22) of the separator (2) is communicated with an inlet (161) of the temperature rising device (16) through a first pipeline (5), and the temperature rising device (16) is used for receiving the separated first pressure relief gas and rising the temperature of the first pressure relief gas; an outlet (162) of the temperature rising device (16) is used for outputting first pressure relief gas after temperature rising;

the separator (2) is used for receiving second pressure relief gas in the lock hopper (1) and separating pulverized coal from the second pressure relief gas; the second pipeline (6) is communicated with the first pipeline (5), and the second pipeline (6) is used for receiving and outputting the second pressure relief gas; the pressure of the second pressure relief gas is less than the pressure of the first pressure relief gas;

the second pipeline (6) is provided with a valve for controlling the on-off of the second pipeline; a valve is arranged at the position, close to the temperature raising device (16), of the first pipeline (5), and the valve is positioned between the temperature raising device (16) and the communication position of the second pipeline (6) and the first pipeline (5);

when the lock hopper outputs first pressure relief gas, the valve of the second pipeline (6) is in a closed state, and the valve of the first pipeline (5) is in an open state, so that the first pressure relief gas is conveyed to the temperature rising device (16);

when the lock hopper outputs second pressure relief gas, the valve of the second pipeline (6) is in an open state, and the valve of the first pipeline (5) is in a closed state, so that the second pressure relief gas is directly output;

a pressure relief opening (110) of the lock hopper (1) is communicated with a material inlet (21) of the separator (2) through the first valve (8); the pressure relief port (110) of the lock hopper (1) is communicated with the first pipeline (5) sequentially through the second valve (9) and the first bypass pipeline (7), and pipelines where the first valve (8) and the separator (2) are located and pipelines where the second valve (9) and the first bypass pipeline (7) are located are parallel pipelines.

2. The pulverized coal conveying apparatus as claimed in claim 1, characterized in that the temperature increasing means is a mixer (4); wherein the content of the first and second substances,

the first inlet (41) of the mixer (4) is communicated with the gas outlet (22) of the separator (2) through a first pipeline (5), and the first inlet (41) of the mixer (4) is used for receiving the first pressure relief gas; the second inlet (42) of the mixer (4) is used for receiving a first make-up gas with a preset temperature, and the outlet (43) of the mixer (4) is used for outputting a mixed gas obtained by mixing the first pressure relief gas with the first make-up gas.

3. Pulverized coal conveying device according to claim 1, characterized in that the separator (2) is placed above the lock hopper (1).

4. The pulverized coal conveying apparatus as claimed in claim 1 or 3,

a solid outlet (23) of the separator (2) is communicated with a feed back port (120) of the lock hopper (1) through a feed pipe (3);

an air inlet (31) is formed in the side wall of the discharging pipe (3), and the air inlet (31) is used for inputting and driving pulverized coal in the discharging pipe (3) to return to air in the lock hopper (1).

5. The pulverized coal conveying apparatus as claimed in claim 1, further comprising: a voltage regulator (10); wherein the content of the first and second substances,

the opening of voltage regulator (10) with pressure regulating mouth (160) of lock fill (1) are linked together, voltage regulator (10) are used for adjusting pressure in the lock fill (1).

6. Pulverized coal conveying device according to claim 5, characterized in that the pressure regulator (10) comprises: a housing (101); wherein the content of the first and second substances,

the shell (101) is provided with a first opening (1011) and a second opening (1012), and the first opening (1011) is communicated with a pressure regulating port (160) of the lock hopper (1);

the first opening (1011) is used for receiving pressurized gas in the lock hopper (1) when the pressure of the lock hopper (1) is greater than a preset pressure; the second opening (1012) is used for outputting the pressurized gas;

the second opening (1012) is also used for receiving second supplementary air when the pressure of the lock hopper (1) is smaller than a preset pressure; the first opening (1011) is also used to deliver the second make-up gas into the lock hopper (1).

7. The pulverized coal conveying apparatus as claimed in claim 5, characterized in that the pressure regulator (10) further comprises: a filter body (102); wherein the content of the first and second substances,

the filter body (102) is connected to the inner wall of the housing (101).

8. The pulverized coal conveying apparatus as claimed in claim 5, further comprising: a second bypass conduit (11), a third valve (12) and a fourth valve (13); wherein the content of the first and second substances,

the pressure regulating port (160) of the lock hopper (1) is communicated with the opening of the pressure regulator (10) through the third valve (12);

the pressure regulating port (160) of lock fill (1) passes through fourth valve (13) with second bypass pipeline (11) are linked together, third valve (12) with the pipeline at voltage regulator (10) place with fourth valve (13) with the pipeline at second bypass pipeline (11) place is parallel pipeline.

9. A pulverized coal gasification system, comprising: the pressurized pulverized coal conveying apparatus as claimed in any one of claims 1 to 8.

10. A method of conveying pulverized coal, comprising the steps of:

a separation step, namely conveying the pressure relief gas in the lock hopper to a separator, wherein the separator separates the pressure relief gas from the pulverized coal carried by the pressure relief gas; wherein the pressure relief gas comprises: a first and a second pressure relief gas; the pressure of the second pressure relief gas is less than the pressure of the first pressure relief gas;

a temperature rising step, wherein the separator conveys the separated first pressure relief gas to a temperature rising device for rising the temperature;

an output step, wherein the temperature rising device outputs the first pressure relief gas after temperature rising; or directly outputting the second pressure relief gas separated by the separator;

the pressure relief gas in the lock hopper is directly conveyed into the separator; or the first pressure relief gas output by the lock hopper is directly conveyed to the temperature rising device, and the second pressure relief gas output by the lock hopper is directly output.

11. The pulverized coal conveying method according to claim 10, wherein in the temperature increasing step, the temperature increasing device is a mixer into which a make-up gas having a preset temperature is input and is mixed with the relief gas.

12. The pulverized coal conveying method as claimed in claim 10, wherein in the separating step, the separator conveys the separated pulverized coal to a lock hopper.