CN204298348U - Vapourizing furnace feed system and gasification system - Google Patents
Vapourizing furnace feed system and gasification system Download PDFInfo
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- CN204298348U CN204298348U CN201420784093.7U CN201420784093U CN204298348U CN 204298348 U CN204298348 U CN 204298348U CN 201420784093 U CN201420784093 U CN 201420784093U CN 204298348 U CN204298348 U CN 204298348U
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- 238000002309 gasification Methods 0.000 title claims abstract description 113
- 239000003245 coal Substances 0.000 claims abstract description 114
- 239000007789 gas Substances 0.000 claims description 184
- 239000002994 raw material Substances 0.000 claims description 101
- 238000002485 combustion reaction Methods 0.000 claims description 93
- 239000001301 oxygen Substances 0.000 claims description 81
- 229910052760 oxygen Inorganic materials 0.000 claims description 81
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 79
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 75
- 229910052757 nitrogen Inorganic materials 0.000 claims description 37
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 238000013022 venting Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 14
- 239000002817 coal dust Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000005984 hydrogenation reaction Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 description 12
- 239000000843 powder Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a kind of vapourizing furnace feed system and gasification system, relates to Coal Gasification Technology field, can solve the problem of vapourizing furnace feed system in gasification system and vapourizing furnace less stable.Described vapourizing furnace feed system comprises unstripped gas plenum system, the output terminal of described unstripped gas plenum system is provided with the multiple unstripped gas delivery conduits for connecting one to one with multiple burning chambers of gasifying furnace nozzle, and each unstripped gas delivery conduit is equipped with current limiting element.The vapourizing furnace feed system that the utility model provides is for the charging of vapourizing furnace, and the gasification system that the utility model provides is for the coal hydrogenation gasification process of solid-state coal dust.
Description
Technical Field
The utility model relates to a coal gasification technical field especially relates to a gasifier charge-in system and coal gasification system.
Background
The coal hydrogasification technology belongs to one of coal gasification technologies. The core technical equipment of the coal hydro-gasification technology is a coal hydro-gasification furnace, a plurality of nozzles are arranged on the coal hydro-gasification furnace, and a plurality of combustion chambers are arranged in each nozzle. The nozzle is used for fully mixing the pulverized coal particles in a certain particle size range provided by the pulverized coal conveying system and the raw material gas with certain pressure and temperature provided by the gas supply system and then supplying the mixture to the gasification furnace so as to perform coal gasification reaction.
Specifically, before entering the nozzle, the raw material gas needs to reach a certain temperature through heat exchange or heating in a combustion furnace and the like; after entering a combustion cavity of the nozzle, raw material gas with a certain temperature is mixed with oxygen or oxygen-containing gas to reach a self-ignition point for secondary combustion; and after secondary combustion, the feed gas with the temperature increased again is collided and mixed with cold coal powder to carry out coal gasification reaction. Because the high-temperature raw material gas with certain pressure flows in the pipeline of the gas supply system and the coal gasification reaction is carried out under certain pressure, measures are required to ensure the stability of the pipeline of the gas supply system and the gasification furnace. In the prior art, a regulating valve or a manual valve is arranged on a pipeline of a gas supply system to regulate gas flow in the pipeline so as to control the stability of the gas flow in the pipeline and a gasification furnace.
However, since the high-temperature and high-pressure gas is conveyed in the pipeline, and the tightness of the regulating valve and the manual valve is poor under the condition of high-pressure and high-temperature coupling, the high-temperature and high-pressure gas is easily leaked by the valve to cause danger, and the uniformity of the gas flow in the pipeline of the gas supply system entering the gasification furnace cannot be safely and stably regulated, so that the stability of the gas supply system and the gasification furnace is poor.
SUMMERY OF THE UTILITY MODEL
The utility model provides a gasifier charge-in system can solve the relatively poor problem of gasifier charge-in system and gasifier stability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a gasifier charge-in system, includes the feed gas feed system, for the stability that improves feed gas feed system and gasifier in use, set up at feed gas feed system's output be used for with a plurality of feed gas output line that a plurality of burning chambers one-to-one of gasifier nozzle are connected, and every feed gas output line all is equipped with the current-limiting element.
The gasifier feed system further comprises an oxygen supply system, in order to improve the stability of the oxygen supply system and the gasifier in use, a plurality of oxygen output pipelines which are connected with the plurality of combustion cavities in a one-to-one correspondence mode are arranged at the output end of the oxygen supply system, and the flow limiting element is arranged on each oxygen output pipeline.
And the same side ends of the oxygen output pipelines, which are far away from the combustion cavity, are connected with a first oxygen pipeline, and in order to ensure the safety of the coal gasification system in use, a first nitrogen pipeline is connected to the first oxygen pipeline.
Furthermore, the raw material gas supply system comprises a combustion furnace pipeline provided with a combustion furnace, one end of the combustion furnace pipeline is connected with the same side end of the plurality of raw material gas output pipelines far away from the plurality of combustion chambers, and the other end of the combustion furnace pipeline is connected with the raw material gas pipeline.
Furthermore, after the overall heat of the coal gasification system is balanced, in order to improve the effective utilization rate of the system heat, the feed gas supply system further comprises a preheater pipeline provided with a preheater, and two ends of the preheater pipeline are respectively and correspondingly connected with two ends of the combustion furnace pipeline.
In order to utilize the circulating synthesis gas in the coal gasification system as the raw material gas and enable the synthesis gas to continue the coal hydro-gasification reaction so as to improve the utilization rate of the synthesis gas, the raw material gas pipeline comprises a circulating raw material gas pipeline and a raw material gas supply pipeline connected to the circulating raw material gas pipeline, and the circulating raw material gas pipeline is connected with the combustion furnace pipeline.
And a second oxygen pipeline is connected to the combustion furnace, and in order to ensure the safety of the combustion furnace in use, a second nitrogen pipeline is connected to the second oxygen pipeline.
The gasifier charge-in system still includes buggy conveying system, buggy conveying system includes the hopper and is used for connecting the coal conveying pipeline of hopper and gasifier reaction cylinder.
The hopper comprises a cylinder and a cone which is positioned below the cylinder and is integrally formed with the cylinder, and the bottom of the cone is connected with the coal conveying pipeline.
The coal conveying pipeline is connected with an adjusting pipeline, a nitrogen pipeline and a venting pipeline, the adjusting pipeline is connected to the coal conveying pipeline close to the hopper, the nitrogen pipeline is connected to the coal conveying pipeline close to the gasification furnace, and the venting pipeline is connected to the coal conveying pipeline between the adjusting pipeline and the nitrogen pipeline.
Based on above-mentioned buggy conveying system, for can form the pressure differential between hopper and gasifier to the transport of buggy cone lower part area is connected with and is used for to the hopper is pressurized, so that the hopper with form the pressure charging pipeline of carrying pressure differential between the gasifier, just barrel upper portion area is connected with and is used for stabilizing the pressure stabilizing pipeline of carrying pressure differential.
Preferably, in order to be able to grasp the conveying amount of the pulverized coal from the hopper to the gasification furnace at any time, an automatic weighing device is arranged in the middle area of the cylinder body, and the physical weight of the pulverized coal in the hopper can be displayed at any time.
Use the utility model provides a during gasifier charge-in system, be connected every feed gas output pipeline of feed gas supply system and each burning chamber one-to-one of gasifier nozzle, because all be provided with the current limiting element on every feed gas output pipeline, and the current limiting element is set for the actual demand of high temperature high pressure feed gas according to each burning chamber to the current limiting of feed gas, can reasonable control get into the high temperature high pressure raw materials tolerance of each burning intracavity, make it with the normal atmospheric temperature oxygen homogeneous mixing who gets into the burning chamber, the reaction intensity and the heat that produces in each burning chamber are balanced, thereby guarantee gasifier and gasifier charge-in system's safety in utilization.
Compared with a regulating valve or a manual valve adopted in the prior art, under the high-temperature and high-pressure coupling condition, the tightness of the flow limiting element is better, and the uniform distribution of high-temperature and high-pressure raw material gas in the pipeline can be more stably regulated, so that the actual demand of each combustion furnace on the high-temperature and high-pressure raw material gas is met, the combustion temperature in each combustion cavity is balanced, the stability of the gasification furnace and the gasification furnace feeding system is improved, the safe use requirement of the whole coal gasification system is met, and the efficiency of the whole coal gasification treatment process is further improved.
Another object of the utility model is to provide a coal gasification system, can solve the relatively poor problem of gasifier charge-in system and the stability of gasifier among the coal gasification system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a coal gasification system comprises a gasification furnace, wherein a reaction cylinder is arranged in the gasification furnace, a nozzle is arranged on the gasification furnace, a plurality of combustion cavities are arranged in the nozzle, and the coal gasification system also comprises the gasification furnace feeding system; a plurality of raw material gas output pipelines in the gasification furnace feeding system are connected with the plurality of combustion chambers in a one-to-one correspondence manner; a plurality of oxygen output pipelines in the gasification furnace feeding system are correspondingly connected with the plurality of combustion cavities one by one; and a coal conveying pipeline in the gasification furnace feeding system is connected with the reaction cylinder.
The advantages of the coal gasification system and the gasifier feeding system are the same compared with the prior art, and the detailed description is omitted here.
Drawings
Fig. 1 is a schematic view of a gasifier feed system provided in an embodiment of the present invention;
fig. 2 is a schematic view of a gasifier feed system including an oxygen supply system and a pulverized coal delivery system according to an embodiment of the present invention.
Reference numerals:
a-a flow restriction element, B-a burner, C-a preheater;
01-raw material gas supply system, 10-raw material gas output pipeline, 11-combustion furnace pipeline, 12-preheater pipeline, 13 a-circulating raw material gas pipeline, 13 b-raw material gas supply pipeline, 14-second oxygen pipeline and 15-second nitrogen pipeline;
02-a pulverized coal conveying system, 20-a coal conveying pipeline, 21-a hopper, 22-an adjusting pipeline, 23-a nitrogen pipeline, 24-an emptying pipeline, 25-a pressurizing pipeline, 26-a pressure stabilizing pipeline and 27-an automatic weighing device;
03-oxygen supply system, 30-oxygen output line, 31-first oxygen line, 32-first nitrogen line;
04-nozzle, 40-combustion chamber.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a gasifier charge-in system provided by the embodiment of the present invention, and it is shown with reference to fig. 1, the gasifier charge-in system includes a raw material gas supply system 01, in order to improve the stability of the raw material gas supply system 01 and the gasifier in use, a plurality of raw material gas output pipelines 10 are arranged at the output end of the raw material gas supply system 01, and each raw material gas output pipeline 10 is provided with a current limiting element a. When in use, the plurality of feed gas output pipelines 10 are correspondingly connected with the plurality of combustion cavities 40 of the gasifier nozzle 04 one by one.
Use the utility model provides a during gasifier charge-in system, because every feed gas output pipeline 10 of feed gas supply system 01 is connected with each 40 one-to-one in burning chamber of gasifier nozzle 04, and all be provided with current-limiting element A on every feed gas output pipeline 10, current-limiting element A calculates the processing according to each burning chamber 40 to the actual demand volume of high temperature high pressure feed gas to the current-limiting of feed gas, can reasonable control get into the high temperature high pressure raw materials tolerance in each burning chamber 40, make it and the normal atmospheric temperature oxygen homogeneous mixing who gets into burning chamber 40, the violent degree of reaction and the heat that produces in each burning chamber 40 are balanced, thereby guarantee gasifier and gasifier charge-in system's safety in utilization.
Compared with a regulating valve or a manual valve adopted in the prior art, under the high-temperature and high-pressure coupling condition, the tightness of the flow limiting element is better, and the uniform distribution of high-temperature and high-pressure raw material gas in the pipeline can be more stably regulated, so that the actual demand of each combustion furnace on the high-temperature and high-pressure raw material gas is met, the combustion temperature in each combustion cavity is balanced, the stability of the gasification furnace and the gasification furnace feeding system is improved, the safe use requirement of the whole coal gasification system is met, and the efficiency of the whole coal gasification treatment process is further improved.
Specifically, the raw material gas refers to hydrogen or a mixed gas containing a certain amount of hydrogen, and the raw material gas is gasification agent required in the coal gasification process. In practical applications, the raw material gas mostly comprises a mixed gas, such as a synthesis gas generated during the operation of a coal gasification system, and the synthesis gas contains residual hydrogen after the coal gasification reaction, and can be recycled as the raw material gas. The oxygen is used as a combustion improver in the coal gasification reaction process, and is used for improving the temperature of the feed gas to finally reach the gasification temperature so as to carry out the coal gasification reaction.
It should be noted that, in practical applications, according to different needs of a coal gasification treatment process, different parts of other pipelines of the gasifier feed system provided in this embodiment are provided with a cut-off valve, a manual valve or/and an adjusting valve for communicating, cutting off material supply or controlling a material supply rate.
In addition, the flow limiting element can adopt an integrated fixed flow limiting element, so that the arrangement mode of each pipeline connected with the nozzle of the gasification furnace can be simplified to a greater extent, and the structure of the whole gasification furnace feeding system is further simplified.
Based on the above-mentioned gasifier feed system, referring to fig. 2, the gasifier feed system further includes an oxygen supply system 03, in order to improve the stability of the oxygen supply system 03 and the gasifier in use, a plurality of oxygen output pipelines 30 are provided at the output end of the oxygen supply system 03, and each oxygen output pipeline 30 is provided with a flow limiting element a. When the gasifier is used, the oxygen output pipelines are connected with the combustion chambers in a one-to-one correspondence mode, normal-temperature oxygen flows in the oxygen output pipelines, the flow limiting element sets the flow limiting of the oxygen according to the actual demand of each combustion chamber on the normal-temperature oxygen, the amount of the normal-temperature oxygen entering each combustion chamber can be reasonably controlled, the normal-temperature oxygen is uniformly mixed with high-temperature and high-pressure feed gas entering the combustion chambers, the intensity of reaction and the generated heat in each combustion chamber are balanced, and therefore the use safety of the gasifier and a gasifier feeding system is further guaranteed.
It is worth mentioning that because the combustion chamber needs the normal temperature oxygen, the adjusting valve or/and the manual valve can be arranged on a plurality of oxygen output pipelines to replace the flow limiting element. The regulating valve, the manual valve and the flow limiting element are different in that: the adjusting valve and the manual valve have poor sealing performance under the high-temperature and high-temperature coupling condition, are not suitable for controlling and adjusting high-temperature and high-pressure gas, but can be suitable for controlling and adjusting normal-temperature gas due to good flexibility of the adjusting valve and the manual valve; the flow limiting element can overcome the problem of poor sealing performance of the regulating valve and the manual valve under the high-temperature and high-temperature coupling condition, and can be suitable for controlling and regulating high-temperature and high-pressure gas and normal-temperature gas.
For the raw material gas supply system, the normal temperature or/and cooling raw material gas must be changed into high temperature raw material gas before entering the nozzle combustion chamber, so as to ensure that the raw material gas reaches the self-ignition point after entering the combustion chamber, is stably combusted after being mixed with oxygen, further increases the temperature to reach the gasification temperature, and is convenient for the coal gasification reaction by colliding with solid coal powder. With continued reference to fig. 1, in order to achieve this object, in the present embodiment, a combustion furnace pipeline 11 is provided in the raw material gas supply system 01, one end of the combustion furnace pipeline 11 is connected to the same side end of the plurality of raw material gas output pipelines 10 far from the combustion chamber 40, the other end is connected to the raw material gas pipeline, and a combustion furnace B is provided on the combustion furnace pipeline 11. When the device is used, the normal temperature or/and cooling raw material gas enters the combustion furnace through the raw material gas pipeline, and part of the raw material gas is combusted in the combustion furnace to heat the other part of the raw material gas, so that the normal temperature or/and cooling raw material gas is changed into the raw material gas with a certain temperature, namely the high-temperature raw material gas.
Generally, a coal gasification system is provided with an after-treatment system connected to a gasification furnace, the after-treatment system is used to recover residual gas and heat in the gasification furnace, the residual gas is generally syngas, and the syngas and the heat can be circulated to a gas supply system during use, so as to improve the utilization rate of the gas and the heat in the coal gasification process.
Therefore, after the heat of the coal gasification system is balanced, in order to improve the effective utilization rate of the heat of the system, the coal gasification system is used for heating the raw material gas at normal temperature or/and cooling the raw material gas, and circulating the raw material gas, the embodiment further comprises a preheater pipeline 12 in the raw material gas supply system 01, two ends of the preheater pipeline 12 are respectively and correspondingly connected with two ends of the combustion furnace pipeline 11, and a preheater C is arranged on the preheater pipeline 12. The preheater is provided with two pairs of inlets and outlets, wherein the inlet of one pair of inlets and outlets is used for allowing the normal-temperature or/and cooling raw material gas to enter the preheater, and the outlet is used for allowing the high-temperature raw material gas to leave the preheater and enter the combustion chamber; and the inlet of the other pair of the inlet and the outlet is used for enabling high-temperature synthetic gas in the rear system to enter the preheater, and the outlet is used for enabling the synthetic gas after heat exchange and temperature reduction to leave the preheater.
In order to increase the effective utilization rate of the residual raw material gas in the post-treatment system and enable the residual raw material gas to be recycled, the raw material gas pipeline comprises a circulating raw material gas pipeline 13a and a raw material gas supply pipeline 13b connected to the circulating raw material gas pipeline 13a, and the circulating raw material gas pipeline 13a is connected with the combustion furnace pipeline 11.
When the system is used, the circulating raw material gas pipeline and the preheater pipeline are equally divided and respectively connected with the post-treatment system, after the integral heat of the coal gasification system reaches balance, high-temperature synthesis gas generated in the coal hydrogenation reaction process in the gasification furnace enters the preheater, heat in the system exchanges heat with the circulating raw material gas recovered by the post-system through the preheater, and the circulating raw material gas is changed into high-temperature gas and enters the combustion chamber, so that the purpose of improving the effective utilization rate of the gas and the heat in the system is achieved.
For the raw material gas supply system, a second oxygen pipeline 14 is connected to the combustion furnace B, and in order to ensure the safety of the combustion furnace B in use, a second nitrogen pipeline 15 is connected to the second oxygen pipeline 14.
In this stage, the operation of the raw material gas supply system will be described in detail based on the whole coal gasification system. In the initial stage of starting the system, the temperature in the gasification furnace is normal temperature, the newly supplied raw material gas and the circulating raw material gas from the post-treatment system are conveyed to the combustion furnace through the raw material gas supply pipeline (at this time, the raw material gas supplied to the combustion furnace is mainly the newly supplied raw material gas, and the newly supplied raw material gas and the circulating raw material gas are normal temperature gas or/and cooling gas), and the second oxygen pipeline connected with the combustion furnace provides normal temperature oxygen for the combustion furnace. In the combustion furnace, raw material gas and oxygen are mixed and stably combusted, part of the raw material gas is heated and reaches each combustion cavity of the nozzle through a raw material gas output pipeline to carry out secondary combustion heating, and the temperature in the gasification furnace begins to rise and is in a high-temperature state. After the heat in the gasification furnace reaches balance, the supply amount of oxygen provided for the combustion furnace is reduced, the supply amount of raw material gas of the preheater is increased at the same time (at this time, the gas provided for the preheater is mainly circulating raw material gas, and the circulating raw material gas is cooling gas), before the supply of oxygen for the combustion furnace is completely stopped, a stop valve and an adjusting valve on a second oxygen pipeline are opened, the input amount of nitrogen is adjusted (at this time, the nitrogen adopts medium-pressure nitrogen), the nitrogen is controlled to blow the oxygen in the second oxygen pipeline into the combustion furnace and maintain the pressure in the second oxygen pipeline, so that the pressure is balanced with the pressure in the combustion furnace, the situation that the high-temperature raw material gas in the combustion furnace enters the second oxygen pipeline to cause backfire is prevented, and further, the danger. When the middle-pressure nitrogen purges the second oxygen pipeline for a preset time, the oxygen supply of the combustion furnace is cut off, then the feed gas supply of the combustion furnace is cut off, and finally the second nitrogen pipeline is cut off. At this time, in the raw material gas supply system, high-temperature raw material gas is supplied to the combustion chamber mainly in such a manner that the preheater preheats the circulating raw material gas, and the synthesis gas and heat in the post-treatment system enter the preheating furnace to exchange heat with the circulating raw material gas. The raw gas in the system is continuously reduced along with the continuous progress of the coal gasification reaction, and at the moment, a newly supplied raw gas is conveyed to the system through a raw gas supply pipeline so as to maintain the normal progress of the coal gasification reaction in the gasification furnace.
With continued reference to fig. 2, for the oxygen supply system 03, a first oxygen line 31 is connected to the oxygen output line 30 on the same side away from the plurality of combustion chambers 40, and a first nitrogen line 32 is connected to the first oxygen line 31 to ensure safety of the coal gasification system during use.
Based on the oxygen supply system, the operation process of the whole coal gasification system is described in detail in this stage by combining the raw material gas supply system and the oxygen supply system. Specifically, in the initial stage of starting the system, high-temperature raw material gas output from the raw material gas supply system enters the combustion chamber, and the raw material gas entering the combustion chamber starts to prepare for nozzle ignition after reaching the self-ignition point. At this time, it should be noted that before ignition, the cut-off valve and the regulating valve on the first nitrogen pipeline need to be opened first, the conveying amount of nitrogen is adjusted (at this time, nitrogen adopts medium-pressure nitrogen), the medium-pressure nitrogen is controlled to purge the first oxygen pipeline, after the temperature in the combustion chamber is stabilized, the cut-off valve and the regulating valve are closed, and the first oxygen pipeline is switched on. The normal temperature oxygen is uniformly distributed to each combustion cavity through each oxygen output pipeline; because the temperature of the raw material gas in the combustion chamber reaches the self-ignition point, the high-temperature raw material gas entering the combustion chamber can be stably combusted with normal-temperature oxygen, the temperature of the high-temperature raw material gas is further increased, and the high-temperature raw material gas reaches the gasification temperature. When the whole system enters a coal powder feeding preparation stage, the combustion temperature of raw material gas in the nozzle is adjusted, coal powder is conveyed after the preset temperature is reached, and coal gasification reaction is carried out in the gasification furnace. If the nozzle is not ignited successfully after oxygen is introduced into the combustion cavity, the first nitrogen pipeline needs to be conducted again, oxygen in the first nitrogen pipeline is blown into the gasification furnace by medium-pressure nitrogen, and oxygen supply is cut off; because the post-treatment system is connected with the gasification furnace, oxygen in the gasification furnace enters the post-treatment system, and the ignition process is repeated after all the oxygen in the gasification furnace enters the post-treatment system.
With continued reference to fig. 2, in this embodiment, the gasifier feed system further includes a pulverized coal conveying system 02, and the pulverized coal conveying system 02 includes a hopper 21 and a coal conveying pipeline 20 for connecting the hopper 21 and the gasifier reaction cylinder. The hopper 21 comprises a cylinder and a cone integrally formed with the cylinder and positioned below the cylinder, and the bottom of the cone is connected with the coal conveying pipeline 20. The coal conveying pipeline 20 is connected with an adjusting pipeline 22, a nitrogen pipeline 23 and a vent pipeline 24, specifically, the adjusting pipeline 22 is connected with the coal conveying pipeline 20 close to the hopper 21, the nitrogen pipeline 24 is connected with the coal conveying pipeline 20 close to the gasification furnace, and the vent pipeline 24 is connected with the coal conveying pipeline 20 between the adjusting pipeline 22 and the nitrogen pipeline 23.
Because the coal conveying pipeline can be remained with the coal dust in use, the coal dust forms a bridge in the pipeline, and can form a barrier to the conveying of the coal dust in the next use process, and the pipeline needs to be cleaned before the coal dust is conveyed in order to prevent the pipeline from being blocked in use. In this embodiment, when the whole system enters the pulverized coal feeding preparation stage, high-pressure nitrogen gas needs to be input into the nitrogen pipeline to purge the pulverized coal conveying pipeline and remove residual pulverized coal in the last use process of the pipeline. The adjusting pipeline is used for inputting adjusting gas into the coal conveying pipeline, and the conveying amount of the coal powder can be controlled by controlling the input speed of the adjusting gas, so that the actual demand of the coal gasification reaction in the gasification furnace can be met. To avoid introducing other gases into the system that are not needed for the coal gasification process, the conditioning gas is preferably a feed gas or pure hydrogen. The emptying pipeline is used as a dredging pipeline after the coal conveying pipeline is blocked under abnormal conditions, and the emptying pipeline is used for emptying the blocked coal powder formed in the coal powder pipeline when the abnormal conditions occur.
Based on the pulverized coal conveying system, in order to form pressure difference between the hopper and the gasification furnace and facilitate conveying of pulverized coal, the lower area of the cone is connected with a pressurizing pipeline 25 which is used for pressurizing the hopper 21 so as to form conveying pressure difference between the hopper 21 and the gasification furnace, and the upper area of the cylinder is connected with a pressure stabilizing pipeline 26 which is used for stabilizing the conveying pressure difference.
The operation process of the pulverized coal conveying system is described in detail based on the whole coal gasification system. When the system is started, coal powder is naturally accumulated in a cone of the hopper, pressurized gas is input into the hopper through the stamping pipeline, and stamping is stopped after the pressure in the hopper is close to and less than a preset conveying pressure; then opening a cut-off valve and an adjusting valve on the nitrogen pipeline, adjusting the input quantity of high-pressure nitrogen, controlling the high-pressure nitrogen to purge the coal conveying pipeline to remove residual coal dust in the pipeline, and cutting off the supply of the high-pressure nitrogen after the pipeline is purged for a preset time; and finally, opening a stop valve and an adjusting valve on the adjusting pipeline, starting to input the adjusting gas and control the conveying speed of the adjusting gas, simultaneously switching on a pressure stabilizing pipeline to input the pressure stabilizing gas so as to stabilize the conveying pressure difference, and opening the stop valve on the pipeline at the lower part of the hopper cone to start conveying the pulverized coal to the gasification furnace when the conveying pressure difference is stabilized to a set value.
Preferably, the conditioning gas, the pressurizing gas and the steady pressure gas are preferably raw gas or pure hydrogen in order to avoid bringing other gases into the system, which are not needed in the coal gasification process.
Preferably, as shown in fig. 2, in order to grasp the amount of the pulverized coal transported from the hopper to the gasification furnace at any time, an automatic weighing device 27 is provided in the middle region of the cylindrical body, so that the physical weight of the pulverized coal in the hopper can be displayed at any time, and an operator can conveniently know the transport condition of the pulverized coal at any time.
Another object of the utility model is to provide a coal gasification system, can solve the relatively poor problem of stability of gas supply system and gasifier in the coal hydrogasification technique.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a coal gasification system comprises a gasification furnace, wherein a reaction cylinder is arranged in the gasification furnace, a nozzle is arranged on the gasification furnace, a plurality of combustion cavities are arranged in the nozzle, and the coal gasification system also comprises the gasification furnace feeding system; wherein, a plurality of raw material gas output pipelines in the gasification furnace feeding system are correspondingly connected with a plurality of combustion chambers one by one; a plurality of oxygen output pipelines in the gasification furnace feeding system are correspondingly connected with a plurality of combustion cavities one by one; and a coal conveying pipeline in the gasification furnace feeding system is connected with the reaction cylinder.
Based on the coal gasification system, in practical application, the gasification furnace may be provided with at least one nozzle, and the gasification furnace feeding system may include at least one pulverized coal conveying system, at least one raw material gas supply system, and at least one oxygen supply system. The number of the pulverized coal conveying systems and the number of the nozzles are the same and the pulverized coal conveying systems and the nozzles are connected in a one-to-one correspondence manner; the number of the raw material gas supply systems is the same as that of the nozzles, and each raw material gas output pipeline in each raw material gas supply system is connected with each combustion cavity in each nozzle in a one-to-one correspondence manner; the number of the oxygen supply systems and the number of the nozzles are the same, and each oxygen output pipeline in each oxygen supply system is connected with each combustion cavity in each nozzle in a one-to-one correspondence mode.
Preferably, according to actual test, when establishing four nozzles and being equipped with four combustion chamber in every nozzle on the gasifier, the collision degree of consistency of feed gas and buggy is higher, and whole coal gasification system's efficiency is higher.
The advantages of the coal gasification system and the gasifier feeding system are the same compared with the prior art, and the detailed description is omitted here.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a gasifier charge-in system, includes the feed gas supply system, its characterized in that, the output of feed gas supply system is equipped with a plurality of feed gas output line that are used for being connected with a plurality of burning chambeies one-to-one of gasifier nozzle, and every all be equipped with the current-limiting element on the feed gas output line.
2. The gasifier feed system of claim 1, further comprising an oxygen supply system, wherein a plurality of oxygen output lines are provided at an output end of the oxygen supply system for one-to-one connection with the plurality of combustion chambers, and each of the oxygen output lines is provided with the flow restriction element.
3. The gasifier feed system of claim 2, wherein a first oxygen line is connected to the same side of the oxygen output lines as the combustion chamber, and a first nitrogen line is connected to the first oxygen line.
4. The gasifier feed system as claimed in claim 1, wherein the raw material gas supply system comprises a combustion furnace pipeline on which a combustion furnace is arranged, one end of the combustion furnace pipeline is connected with the same side end of the plurality of raw material gas output pipelines far away from the combustion chamber, and the other end of the combustion furnace pipeline is connected with a raw material gas pipeline;
and the feed gas supply system also comprises a preheater pipeline provided with a preheater, and two ends of the preheater pipeline are respectively and correspondingly connected with two ends of the combustion furnace pipeline.
5. The gasifier feed system of claim 4, wherein the raw gas pipeline comprises a circulating raw gas pipeline and a raw gas supply pipeline connected to the circulating raw gas pipeline, and the circulating raw gas pipeline is connected to the combustion furnace pipeline.
6. The gasifier feed system as claimed in claim 5, wherein a second oxygen line is connected to said combustion furnace, and a second nitrogen line is connected to said second oxygen line.
7. The gasifier feed system of claim 1, further comprising a pulverized coal delivery system, the pulverized coal delivery system comprising a hopper and a coal delivery pipeline for connecting the hopper with the gasifier reaction cylinder;
the hopper comprises a cylinder and a cone which is positioned below the cylinder and is integrally formed with the cylinder, and the bottom of the cone is connected with the coal conveying pipeline;
the coal conveying pipeline is connected with an adjusting pipeline, a nitrogen pipeline and a venting pipeline, the adjusting pipeline is connected to the coal conveying pipeline close to the hopper, the nitrogen pipeline is connected to the coal conveying pipeline close to the gasification furnace, and the venting pipeline is connected to the coal conveying pipeline between the adjusting pipeline and the nitrogen pipeline.
8. The gasifier feed system of claim 7, wherein a charging line for charging the hopper with pressure to form a transport pressure difference between the hopper and the gasifier is connected to a lower region of the cone, and a pressure stabilizing line for stabilizing the transport pressure difference is connected to an upper region of the barrel.
9. The gasifier feed system according to claim 7, wherein the barrel mid-region is provided with an automatic weighing device.
10. A coal gasification system comprising a gasifier with a reaction vessel therein, a nozzle with a plurality of combustion chambers therein, and a gasifier feed system according to any of claims 1 to 9; wherein,
a plurality of raw material gas output pipelines in the gasification furnace feeding system are connected with the plurality of combustion chambers in a one-to-one correspondence manner;
a plurality of oxygen output pipelines in the gasification furnace feeding system are correspondingly connected with the plurality of combustion cavities one by one;
and a coal conveying pipeline in the gasification furnace feeding system is connected with the reaction cylinder.
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| CN201420784093.7U CN204298348U (en) | 2014-12-11 | 2014-12-11 | Vapourizing furnace feed system and gasification system |
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| CN201420784093.7U CN204298348U (en) | 2014-12-11 | 2014-12-11 | Vapourizing furnace feed system and gasification system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106635172A (en) * | 2015-11-04 | 2017-05-10 | 神华集团有限责任公司 | Jet assembly, multi-burner gasifier and feeding system thereof |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106635172A (en) * | 2015-11-04 | 2017-05-10 | 神华集团有限责任公司 | Jet assembly, multi-burner gasifier and feeding system thereof |
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