CN214881308U

CN214881308U - Coal gasification process system

Info

Publication number: CN214881308U
Application number: CN202121072291.7U
Authority: CN
Inventors: 马超; 陈罗刚; 付强; 钟振卫; 刘荣军; 贺大勇; 白皓; 苏延荣; 甄伟
Original assignee: Shaanxi Yanchang Petroleum Yan'an Energy And Chemical Co ltd
Current assignee: Shaanxi Yanchang Petroleum Yan'an Energy And Chemical Co ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-11-26
Anticipated expiration: 2031-05-19

Abstract

The utility model discloses a coal gasification process system, including the gasifier, the bottom below intercommunication of gasifier has the lock to fight, one side of gasifier intercommunication has vapour and liquid separator and scrubbing tower in proper order, the entry end intercommunication of scrubbing tower has venturi, venturi keeps away from the one end and the vapour and liquid separator top intercommunication of scrubbing tower, the lower part intercommunication of scrubbing tower has the buck circulating pump, the exit end of buck circulating pump communicates respectively to venturi and keeps away from scrubbing tower one end and gasifier lower part, it has the black water filter still to communicate between buck circulating pump and the gasifier, the bottom below of black water filter communicates to the lock top of fighting. The utility model adopts slag-containing medium at the bottom of the black water filter to stamp the lock bucket, and as the outlet of the black water filter is the quenching chamber and the lock bucket of the gasification furnace, the phenomena of unsmooth slag discharge and over-pressure of the lock bucket can not be caused even if the valve is leaked; meanwhile, slag at the bottom of the black water filter is discharged outwards, so that the problems of filter screen blockage and insufficient chilling water quantity are solved.

Description

Coal gasification process system

Technical Field

The utility model belongs to the technical field of coal slurry gasification process system, concretely relates to coal gasification process system.

Background

In the coal gasification process, the crude gas produced by the combustion chamber of the gasification furnace enters the chilling chamber from the downcomer and is cooled to 252 ℃ by the chilling water, and the slag in the crude gas sinks to the bottom of the chilling chamber. The crude gas enters a venturi tube from a gasification furnace at the upper part of the chilling chamber, is infiltrated and mixed with grey water from a grey water circulating pump in the venturi tube, and then enters a conversion system after fine ash is removed in a washing tower, while black water discharged from the bottom of the washing tower enters a grey water treatment system. The cleaner part of the grey water in the washing tower is supplied to the chilling water distributor of the gasification furnace and the venturi tube through the grey water circulating pump.

In the prior art system, when the grey water circulating pump supplies water to the chilling chamber, the water passes through the black water filter, the filtered medium enters the chilling chamber of the gasification furnace, impurities are left in the black water filter, and the filter screen is blocked or the chilling water quantity is insufficient due to poor medium cleanliness. In addition, the deoxidizing water pump is used for stamping the lock hopper, the medium pressure is 7.6-8.0 MPA, the normal slag discharge pressure difference of the gasification furnace is controlled to be 0.25Mpa, when the valve is jammed or leaks, the lock hopper is easy to cause overpressure, the gasification furnace cannot normally discharge slag, and the lock hopper has overpressure risk.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a coal gasification process systems has solved the easy superpressure of lock fill and the relatively poor problem that often causes the filter screen to block up or chilling water yield is not enough among the current process systems.

The utility model adopts the technical proposal that: the utility model provides a coal gasification process system, including the gasifier, there is the lock fill bottom below of gasifier through the pipeline intercommunication, there are vapour and liquid separator and scrubbing tower one side of gasifier through the pipeline intercommunication in proper order, the entry end intercommunication of scrubbing tower has venturi, venturi keeps away from the one end and the vapour and liquid separator top intercommunication of scrubbing tower, there is grey water circulating pump the lower part of scrubbing tower through the pipeline intercommunication, the exit end of grey water circulating pump communicates respectively to venturi through two branch road pipelines and keeps away from scrubbing tower one end and gasifier lower part, it has the black water filter still to communicate on the pipeline between grey water circulating pump and the gasifier, the bottom below of black water filter communicates to the lock fill top through the pipeline.

The utility model is also characterized in that,

the gasification furnace is internally and sequentially provided with a combustion chamber and a chilling chamber which are communicated with each other from top to bottom, the upper part of the chilling chamber is communicated with a gas-liquid separator, the middle part of the chilling chamber is communicated with a black water filter, and the lower part of the bottom end of the chilling chamber is communicated with a lock hopper.

The black water filter comprises a shell, a grey water circulating pump is communicated to the side wall of the shell, a closed filter screen with a hollow interior is arranged in the shell, and the lower portion of the chilling chamber penetrates through the shell and is communicated to the filter screen.

The top end of the lock bucket is communicated with a lock bucket flushing water tank through a pipeline.

A back flushing water pipeline is communicated with the communicating pipeline of the lock hopper and the lower part of the bottom end of the gasification furnace.

The top end of the washing tower is communicated to the conversion system through a pipeline, and the bottom end of the washing tower is communicated to the grey water treatment system through a pipeline.

The utility model has the advantages that: the utility model relates to a coal gasification process system, which adopts slag-containing medium at the bottom of a black water filter to stamp a lock hopper, and the outlet of the black water filter is a gasification furnace chilling chamber and the lock hopper, so the stamping pressure of the lock hopper is the same as the pressure of the gasification furnace without pressure difference, and the phenomena of unsmooth slag discharge and over-pressure of the lock hopper can not be caused even if a valve is leaked; meanwhile, slag at the bottom of the black water filter is discharged outwards, so that the problems of filter screen blockage and insufficient chilling water quantity are solved.

Drawings

Fig. 1 is a schematic structural diagram of a coal gasification process system of the present invention.

In the figure, 1, a gasification furnace, 2, a lock hopper, 3, a gas-liquid separator, 4, a washing tower, 5, a venturi tube, 6, a grey water circulating pump, 7, a black water filter, 8, a combustion chamber, 9, a chilling chamber, 10, a shell, 11, a filter screen, 12, a lock hopper flushing water tank and 13, a back flushing water pipeline.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a coal gasification process system, as shown in figure 1, comprising a gasification furnace 1, a combustion chamber 8 and a chilling chamber 9 which are communicated with each other are sequentially arranged in the gasification furnace 1 from top to bottom, a lock bucket 2 is communicated with the lower part of the bottom end of the chilling chamber 9 of the gasification furnace 1 through a pipeline, a back washing water pipeline 13 is also communicated between the two, the top end of the lock bucket 2 is communicated with a lock bucket washing water tank 12 through a pipeline, the upper part of the chilling chamber 9 at one side of the gasification furnace 1 is sequentially communicated with a gas-liquid separator 3 and a top end through pipelines, the bottom end is respectively communicated with a washing tower 4 of a conversion system and a treatment system, the inlet end of the washing tower 4 is communicated with a grey water venturi tube 5, one end of the venturi tube 5 far away from the washing tower 4 is communicated with the top end of the gas-liquid separator 3, the lower part of the washing tower 4 is communicated with a grey water circulating pump 6 through a pipeline, the outlet end of the grey water circulating pump 6 is respectively communicated with one end of the venturi tube 5 far away from the washing tower 4 and the middle part of the chilling chamber 9 of the gasification furnace 1 through two branch pipelines, a black water filter 7 is also communicated on a pipeline between the grey water circulating pump 6 and the chilling chamber 9 of the gasification furnace 1, and the lower part of the bottom end of the black water filter 7 is communicated to the top end of the lock hopper 2 through a pipeline.

The black water filter 7 comprises a shell 10, a grey water circulating pump 6 is communicated to the side wall of the shell 10, a closed filter screen 11 with a hollow interior is arranged in the shell 10, and the lower part of the chilling chamber 9 penetrates through the shell 10 and then is communicated to the filter screen 11.

During operation, crude gas produced by a combustion chamber 8 of the gasification furnace 1 enters a chilling chamber 9 from a descending pipe, slag in the crude gas sinks to the bottom of the chilling chamber 9 and then is discharged into a lock hopper 2, the crude gas is discharged from the upper part of the chilling chamber 9 out of the gasification furnace 1, is dehydrated by a gas-liquid separator 3 and then enters a venturi tube 5, is soaked and mixed with cleaner grey water from a grey water circulating pump 6 in the venturi tube 5 and enters a washing tower 4, then the crude gas after fine ash removal in the washing tower 4 enters a conversion system, and black water discharged from the bottom of the washing tower 4 enters a grey water treatment system. The clean part of grey water in the washing tower 4 is also supplied to a chilling chamber 9 of the gasification furnace 1 through a grey water circulating pump 6, the grey water is filtered through a black water filter 7 in the process, the filtered slag water can directly punch the lock bucket 2, and the slag water of the black water filter 7 is utilized to reduce the blockage of a filter screen and reduce the cleaning frequency; the second black water filter 7 is communicated with a chilling chamber 9 of the gasification furnace 1 and the lock bucket 2, the stamping pressure of the lock bucket 2 is the same as that of the gasification furnace 1, overpressure of the lock bucket 2 cannot be caused, and slag can be discharged from the gasification furnace 1 normally and smoothly. The lock bucket flushing water tank 12 can periodically flush the lock bucket 2, and the backwashing water pipeline 13 can flush both the quenching chamber 9 of the gasification furnace 1 and the lock bucket 2. As the utility model discloses a further improvement, with the end lug connection of intaking of black water filter 7 on casing 10, go out the water end and connect on filter screen 11 to make the medium from filter screen 11 outside entering from filter screen 11 inside play, 2 punching press media are fought to the lock use 7 filter screens of black water filter 11 outsides not through filterable medium and bottom sediment, it has design, production, cost, safety etc. advantage to fight with this medium punching press lock, and can reduce the back system grey water slag content and improve quality of water.

In this way, the utility model relates to a coal gasification process system adopts 7 bottoms of black water filter to contain the sediment medium and carry out the punching press to lock fill 2, because 7 exports of black water filter are 1 chilling chamber 9 of gasifier and lock fill 2, so lock fill 2 punching press pressure is the same with 1 pressure of gasifier and not have pressure differential, even the valve is revealed and can not be made a lot of and not make pressure differentialThe phenomena of unsmooth slag discharge and overpressure of the lock bucket 2 are avoided, the pressure difference between the gasification furnace 1 and the lock bucket 2 cannot exceed the measuring range, the pressure of the lock bucket 2 can only be balanced with the pressure of the gasification furnace 1 even if the situation of leakage in a stamping valve occurs, and the situations of overpressure and incapability of discharging slag from the gasification furnace 1 cannot occur; meanwhile, slag at the bottom of the black water filter is discharged outwards, the problems of filter screen blockage and insufficient chilling water amount are solved, the black water filter needs 3 to 5 days for shutdown maintenance every time originally, the main cost is in maintenance and high-pressure cleaning, the black water filter 7 is adopted to directly discharge slag water for stamping the lock hopper 2, and the stamping water amount is 0.3m³-0.4m³Once in 0.5 hour, can satisfy black water filter 7 bottom row sediment, avoid digging the sediment, online clearance, outwards discharge black water impurity from the source moreover, improve back system grey water quality of water and have certain help. The ash content of the system is reduced, the impurities of the system are reduced, the abrasion of pipelines is reduced so as to achieve long-period operation of the pipelines of the rear system, and the water quality of a coal water slurry process system is improved so as to achieve more stable long-period operation of the whole system. In addition, black water filter unit up-stream time is about 40 days, and black water filter 7 need fall on line and online clearance when gasifier 1 long period operation, because this medium high temperature high pressure, this operation causes great safe risk, and partial unit can use unnecessary not to carry out the clearance of filter screen 11 as long as possible, nevertheless can cause the downtake to warp to lead to the fact equipment to damage and safe risk owing to chilling water volume decline this moment, and the utility model discloses increased black water filter 7 blowdown flow and prolonged black water filter 7 life greatly, reduced the downtake and damaged the feasibility.

Claims

1. The utility model provides a coal gasification process system, a serial communication port, including gasifier (1), there is lock fill (2) bottom below of gasifier (1) through the pipeline intercommunication, there are vapour and liquid separator (3) and scrubbing tower (4) one side of gasifier (1) through the pipeline intercommunication in proper order, the entry end intercommunication of scrubbing tower (4) has venturi (5), venturi (5) keep away from the one end and the top intercommunication of vapour and liquid separator (3) of scrubbing tower (4), there is grey water circulating pump (6) lower part through the pipeline intercommunication in the lower part of scrubbing tower (4), the exit end of grey water circulating pump (6) communicates respectively to venturi (5) and keeps away from scrubbing tower (4) one end and gasifier (1) lower part through two branch road pipelines, it has black water filter (7) still to communicate to on the pipeline between grey water circulating pump (6) and gasifier (1), the bottom below of black water filter (7) communicates to lock fill (2) top through the pipeline.

2. The coal gasification process system according to claim 1, wherein a combustion chamber (8) and a chilling chamber (9) which are communicated with each other are sequentially arranged in the gasification furnace (1) from top to bottom, the upper part of the chilling chamber (9) is communicated with the gas-liquid separator (3), the middle part of the chilling chamber (9) is communicated with the black water filter (7), and the lower part of the bottom end of the chilling chamber (9) is communicated with the lock hopper (2).

3. A coal gasification process system according to claim 2, characterized in that the black water filter (7) comprises a housing (10), the grey water circulating pump (6) is connected to the side wall of the housing (10), a closed filter screen (11) with a hollow interior is arranged in the housing (10), and the lower part of the quench chamber (9) passes through the housing (10) and is connected to the filter screen (11).

4. A coal gasification process system according to claim 1, characterized in that the top end of the lock hopper (2) is connected with a lock hopper flushing water tank (12) through a pipeline.

5. The coal gasification process system according to claim 1, wherein a back flush water pipe (13) is further communicated with a communication pipe between the lower part of the bottom end of the gasification furnace (1) and the lock hopper (2).

6. A coal gasification process system according to claim 1, characterized in that the top end of the scrubber tower (4) is connected to the shift system by a pipe and the bottom end of the scrubber tower (4) is connected to the grey water treatment system by a pipe.