CN214991325U - Fine coal powder recycling system for fine coal pyrolysis - Google Patents
Fine coal powder recycling system for fine coal pyrolysis Download PDFInfo
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- CN214991325U CN214991325U CN202120888578.0U CN202120888578U CN214991325U CN 214991325 U CN214991325 U CN 214991325U CN 202120888578 U CN202120888578 U CN 202120888578U CN 214991325 U CN214991325 U CN 214991325U
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Abstract
The utility model relates to a fine coal powder recycling system for pulverized coal pyrolysis, which belongs to the technical field of pulverized coal pyrolysis, specifically, the bottom discharge port of a high-temperature coarse dust collector and a high-temperature fine dust collector is connected with a spiral material conveyor through a first dust collecting tank, the discharge port of the spiral material conveyor is connected with a pulverized coal injection device through a second dust collecting tank, the discharge port of the pulverized coal injection device is connected with a process heating furnace through a pipeline, low-temperature flue gas discharged by the pulverized coal pyrolysis device, one part of the flue gas enters a desulfurization and denitration system, the other part of the flue gas enters the pulverized coal injection device through a flue gas recycling pipeline, the flue gas recycling pipeline is also provided with a temperature adjusting pipeline, and the temperature adjusting pipeline is connected with a flue gas chamber of the process heating furnace; the utility model discloses simple structure, convenient to use can effectively solve the utilization difficult problem of fine coal powder that contains in the low order buggy coal pyrolysis raw coke oven gas, has realized utilizing on the spot, improves fine coal utilization ratio, make full use of effective resource to reduce device investment and running cost.
Description
Technical Field
The utility model relates to a fine coal powder recycling system for fine coal pyrolysis belongs to fine coal pyrolysis technical field.
Background
Coal is the main energy source in a period of our country. In 2006, the resource amount of Chinese coal is 10345 hundred million tons, the remaining exploratory recoverable reserves account for about 13 percent of the world, and the third world, wherein the reserves of low-rank coal account for about 57 percent. In recent years, more than 30 hundred million tons of coal are adopted in China every year, and more than half of the coal is low-rank coal. Meanwhile, the coal and carbon utilization form in China is relatively simple, most of the coal and carbon utilization forms are used for combustion and power generation, oil and gas resources in coal are combusted in a simple form, the principle of high quality, high use and low use is not met, and the environmental problem is aggravated. By conservative measurement, about more than 1 hundred million tons of oil and gas resources are wasted every year. Therefore, the development of clean and efficient decomposition and quality-separation utilization technology for coal, especially low-rank coal, is urgently needed.
At present, the existing low-rank coal pyrolysis process mainly adopts a pulverized coal pyrolysis device to carry out segmented pyrolysis, and a large amount of dust-containing raw coke oven gas can be generated in the pulverized coal pyrolysis process. The existing treatment mode is to remove dust from the dust-containing raw gas by a multi-stage high-temperature dust remover and then treat the fine coal powder. Because the fine coal powder has fine granularity, the fine coal powder is not beneficial to transportation when being sold separately, and the fine coal powder is easy to explode; the mixing of the fine coal powder and the upgraded coal after pyrolysis is extremely easy to cause uneven mixing, uneven humidification, fine coal powder pollution in the transportation process and the like, so how to recycle the fine coal powder and avoid resource waste is a technical problem to be solved urgently in the fine coal pyrolysis industry.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem that prior art exists, the utility model provides a simple structure, convenient to use can effectively improve fine coal utilization ratio, the fine coal powder for pyrolysis of make full use of effective resources retrieves system of recycling.
In order to achieve the above object, the utility model discloses a technical scheme who adopts is a fine coal powder recycling system for fine coal pyrolysis, including fine coal pyrolysis device, high temperature coarse dust collector and the fine dust collector of high temperature, its characterized in that: first fine coal dust collecting tank is installed respectively to the bottom discharge gate of high temperature coarse dust remover and high temperature fine dust remover, the bottom ash outlet of first fine coal dust collecting tank is connected with the auger delivery ware respectively, the second fine coal dust collecting tank is installed to the discharge gate of auger delivery ware, the discharge gate of second fine coal dust collecting tank is connected with buggy jetting device through the cooler, the inlet port of buggy jetting device is connected with first flue gas booster, the discharge gate of buggy jetting device is linked together through pipeline and technology heating furnace and is separated, the low temperature flue gas that fine coal pyrolysis device discharged gets into second flue gas booster after the dust remover filters, through the flue gas after second flue gas booster pressure boost, a part flue gas gets into desulfurization and takes off-sell the system, and another part gets into first flue gas booster through flue gas retrieval and utilization pipeline, just still be provided with the pipeline of adjusting the temperature on the flue gas retrieval and utilization pipeline, the temperature adjusting pipeline is connected with a flue gas chamber of the process heating furnace, the flue gas recycling pipeline and the temperature adjusting pipeline are respectively provided with a control valve, and flue gas generated by the process heating furnace and flue gas generated by the temperature adjusting pipeline are mixed and then enter the pulverized coal pyrolysis device.
Preferably, the pulverized coal pyrolysis device is a pulverized coal pyrolysis rotary kiln, and flue gas generated by the process heating furnace and flue gas of the temperature adjusting pipeline are mixed and then enter the pulverized coal pyrolysis rotary kiln to serve as a heat source.
Preferably, the heat exchanger is still installed to fine coal pyrolysis device's discharge gate, the flue gas that the technology heating furnace produced gets into after mixing with the flue gas of the pipeline that adjusts the temperature in the heat exchanger carry out the heat exchange with solid material, make solid material carry out the secondary pyrolysis, warp flue gas behind the heat exchanger heat transfer gets into fine coal pyrolysis rotary kiln and is the heat source, and the raw coke oven gas that solid material pyrolysis produced gets into high temperature coarse dust collector, then gets into the fine dust collector of high temperature.
Preferably, the heat exchanger is still installed to fine coal pyrolysis device's discharge gate, the flue gas that the technology heating furnace produced mixes the back with the flue gas of the pipeline that adjusts the temperature, and partly mixed flue gas gets into the pyrolysis section of fine coal pyrolysis rotary kiln, and another part gets into the heat exchanger carries out the heat exchange with solid material, makes solid material carry out the secondary pyrolysis, warp flue gas after the heat exchanger heat transfer gets into the drying section of fine coal pyrolysis rotary kiln, and dusty raw coke oven gas that solid material produced gets into the coarse dust remover of high temperature.
Preferably, the discharge hole of the second fine coal dust collecting tank is connected with a coal dust injection device through a cooler.
Compared with the prior art, the utility model discloses following technological effect has:
1. the invention has simple structure and reasonable design, mixes the fine coal powder after dust removal with the low-temperature flue gas discharged by the pulverized coal pyrolysis device, enters the process heating furnace for combustion, and utilizes the high-temperature dust removal ash as the heating furnace fuel. Firstly, considering from the aspect of process safety, the particle size of the dust is small, the humidity is not easy to adjust, the dust is easy to raise to reach the explosion limit, and meanwhile, the volatile phase is relatively high, the spontaneous combustion is easy, and potential safety hazards are formed; secondly, the ash content of the dust-removing fine coal powder is high, and the dust-removing fine coal powder is mixed into a product to influence the quality of the product; thirdly, low-temperature flue gas discharged by the pulverized coal pyrolysis device is used as an injection medium for removing dust and pulverized coal, and the oxygen content is low and is safer than that of the conventional method in which air is used as the injection medium; finally, the temperature of the fine coal powder obtained by dedusting in the project is high, if the dedusting ash is taken as a product, the fine coal powder must be cooled to normal temperature from high temperature, if the dedusting ash is taken as a fuel of a heating furnace, the fine coal powder can be cooled without cooling, or cooled to about 200 ℃, low-temperature flue gas discharged by a fine coal pyrolysis device is conveyed to the heating furnace, and the energy utilization is more reasonable.
2. The invention utilizes the high-temperature fly ash produced by the system as fuel, not only realizes the self-circulation of the system materials, but also saves the investment of a pulverizing system.
3. The high-temperature dedusting ash has high temperature and heat, and is directly sent into a combustion system, so that the energy is saved.
4. The flue gas after heat utilization is used as an inert gas conveying medium, so that the recycling of the flue gas is realized, the safety of a pneumatic conveying system is improved, the combustibility of fine coal powder is improved, the reduction of the oxygen content of the flue gas at the outlet of a heating furnace is facilitated, the oxidation corrosion to a subsequent system is reduced, and the long-period operation of equipment is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a third embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a fourth embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
As shown in figure 1, a fine coal dust recycling system in pulverized coal pyrolysis raw gas comprises a pulverized coal pyrolysis device 1, a high-temperature coarse dust collector 2 and a high-temperature fine dust collector 3, wherein a first fine coal dust collecting tank 4 is respectively installed at the bottom discharge ports of the high-temperature coarse dust collector 2 and the high-temperature fine dust collector 3, the bottom ash outlet of the first fine coal dust collecting tank 4 is respectively connected with a screw conveyor 5, a second fine coal dust collecting tank 6 is installed at the discharge port of the screw conveyor 5, the discharge port of the second fine coal dust collecting tank 6 is connected with a pulverized coal injection device 8 through a cooler 7, the air inlet of the pulverized coal injection device 8 is connected with a first flue gas supercharger 9, the discharge port of the pulverized coal injection device 8 is connected with a process heating furnace 10 through a pipeline, low-temperature flue gas discharged by the pulverized coal pyrolysis device 8 enters a second flue gas supercharger 11 after being filtered by the dust collector, and flue gas pressurized by the second flue gas supercharger 11, one part of the flue gas enters a desulfurization and denitration system, the other part of the flue gas enters a first flue gas supercharger 9 through a flue gas recycling pipeline 12, a temperature adjusting pipeline 13 is further arranged on the flue gas recycling pipeline 12, the temperature adjusting pipeline 13 is connected with a flue gas chamber of the process heating furnace 10, control valves 14 are respectively arranged on the flue gas recycling pipeline 12 and the temperature adjusting pipeline 13, and the flue gas generated by the process heating furnace 10 and the flue gas of the temperature adjusting pipeline 13 are mixed and then enter the pulverized coal pyrolysis device 1 to serve as a heat source.
In the embodiment, the pulverized coal after dust removal is conveyed into a pulverized coal injection device, low-temperature flue gas discharged by a pulverized coal pyrolysis device is pressurized and then mixed with the pulverized coal in the powder injection device, and then the mixture is conveyed into a process heating furnace for combustion, high-temperature flue gas generated by combustion is mixed with low-temperature flue gas conveyed by a temperature adjusting pipeline, the temperature of the flue gas is adjusted, and the flue gas is conveyed to the pulverized coal pyrolysis device to serve as a heat source.
Example two
As shown in fig. 2, the pulverized coal pyrolysis device 1 is a pulverized coal pyrolysis rotary kiln, and flue gas generated by the process heating furnace and flue gas of the temperature adjusting pipeline are mixed and then enter a pyrolysis section of the pulverized coal pyrolysis rotary kiln. The rest is the same as the first embodiment.
EXAMPLE III
As shown in fig. 3, a heat exchanger 15 is further installed at a discharge port of the pulverized coal pyrolysis device 1, flue gas generated by the process heating furnace 10 is mixed with flue gas of the temperature adjusting pipeline and then enters the heat exchanger 15 to exchange heat with solid materials, so that the solid materials are pyrolyzed for the second time, the flue gas after heat exchange by the heat exchanger 15 enters a pyrolysis section of the pulverized coal pyrolysis rotary kiln, and dust-containing raw gas generated by pyrolysis of the solid materials enters a high-temperature coarse dust collector and then enters a high-temperature fine dust collector. The rest is the same as the embodiment.
This embodiment is through the discharge gate installation heat exchanger at fine coal pyrolysis device, carries out the heat exchange with the flue gas of the flue gas that the technology heating furnace produced and heat exchanger, makes solid material carry out the secondary pyrolysis, adjusts the temperature of flue gas simultaneously, then the pyrolysis section of reentrant fine coal pyrolysis rotary kiln.
Example four
As shown in fig. 4, a heat exchanger 15 is further installed at a discharge port of the pulverized coal pyrolysis device 1, after flue gas generated by the process heating furnace is mixed with flue gas of the temperature adjusting pipeline, a part of the mixed flue gas enters a pyrolysis section of the pulverized coal pyrolysis rotary kiln, the other part of the mixed flue gas enters the heat exchanger to exchange heat with solid materials, so that the solid materials are subjected to secondary pyrolysis, the flue gas after heat exchange of the heat exchanger enters a drying section of the pulverized coal pyrolysis rotary kiln, and waste flue gas generated by the heat exchanger enters a high-temperature coarse dust collector. The rest is the same as the embodiment.
In this embodiment, the flue gas temperature after heat exchange is fully considered, when the temperature after heat exchange is not enough for pyrolysis, a part of flue gas generated by the process heating furnace enters the heat exchanger for heat exchange, the flue gas after heat exchange directly enters the drying section of the pulverized coal pyrolysis rotary kiln for drying, and the other part of flue gas generated by the process heating furnace directly enters the hot stage of the pulverized coal pyrolysis rotary kiln to be a pyrolysis heat source.
The foregoing is considered as illustrative and not restrictive of the preferred embodiments of the invention, and any modifications, equivalents and improvements made within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The utility model provides a fine coal powder recycling system for fine coal pyrolysis, includes fine coal pyrolysis device, high temperature coarse dust collector and the fine dust collector of high temperature, its characterized in that: first fine coal dust collecting tank is installed respectively to the bottom discharge gate of high temperature coarse dust remover and high temperature fine dust remover, the bottom ash outlet of first fine coal dust collecting tank is connected with the auger delivery ware respectively, the second fine coal dust collecting tank is installed to the discharge gate of auger delivery ware, the discharge gate of second fine coal dust collecting tank is connected with buggy jetting device, the inlet port of buggy jetting device is connected with first flue gas booster, the discharge gate of buggy jetting device is linked together through pipeline and technology heating furnace and is separated, the low temperature flue gas that fine coal pyrolysis device discharged gets into second flue gas booster after the dust remover filters, the low temperature flue gas after the second flue gas booster pressure boost, partly low temperature flue gas get into the desulfurization and take off-sell the system, another part gets into first flue gas booster through low temperature flue gas retrieval and utilization pipeline, just still be provided with the temperature regulating pipeline on the flue gas retrieval and utilization pipeline, the temperature adjusting pipeline is connected with a flue gas chamber of the process heating furnace, the flue gas recycling pipeline and the temperature adjusting pipeline are respectively provided with a control valve, and flue gas generated by the process heating furnace and flue gas generated by the temperature adjusting pipeline are mixed and then enter the pulverized coal pyrolysis device.
2. The fine coal powder recycling system for pulverized coal pyrolysis according to claim 1, characterized in that: the pulverized coal pyrolysis device is a pulverized coal pyrolysis rotary kiln, and flue gas generated by the process heating furnace and flue gas of the temperature regulating pipeline are mixed and then enter the pulverized coal pyrolysis rotary kiln to serve as a heat source.
3. The fine coal powder recycling system for pulverized coal pyrolysis according to claim 2, characterized in that: the heat exchanger is still installed to fine coal pyrolysis device's discharge gate, the flue gas that the technology heating furnace produced gets into after mixing with the flue gas of the pipeline that adjusts the temperature in the heat exchanger carry out the heat exchange with solid material, make solid material carry out the secondary pyrolysis, warp flue gas behind the heat exchanger heat transfer gets into fine coal pyrolysis rotary kiln and is the heat source, and dusty raw coke oven gas that solid material pyrolysis produced gets into high temperature coarse dust remover, then gets into the fine dust remover of high temperature.
4. The fine coal powder recycling system for pulverized coal pyrolysis according to claim 2, characterized in that: the heat exchanger is still installed to fine coal pyrolysis device's discharge gate, the flue gas that the technology heating furnace produced mixes the back with the flue gas of the pipeline that adjusts the temperature, and partly mixed flue gas gets into the pyrolysis section of fine coal pyrolysis rotary kiln, and another part gets into the heat exchanger carries out the heat exchange with solid material, makes solid material carry out the secondary pyrolysis, warp flue gas after the heat exchanger heat transfer gets into the drying section of fine coal pyrolysis rotary kiln, and dusty raw gas that solid material produced gets into the coarse dust remover of high temperature.
5. The fine coal powder recycling system for pulverized coal pyrolysis according to claim 1, characterized in that: and a discharge port of the second fine coal powder collecting tank is connected with a coal powder injection device through a cooler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120888578.0U CN214991325U (en) | 2021-04-22 | 2021-04-22 | Fine coal powder recycling system for fine coal pyrolysis |
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| CN202120888578.0U CN214991325U (en) | 2021-04-22 | 2021-04-22 | Fine coal powder recycling system for fine coal pyrolysis |
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