CN211645120U - Low-rank coal segmented upgrading and hot flue gas gradient utilization system - Google Patents
Low-rank coal segmented upgrading and hot flue gas gradient utilization system Download PDFInfo
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- CN211645120U CN211645120U CN202020088375.9U CN202020088375U CN211645120U CN 211645120 U CN211645120 U CN 211645120U CN 202020088375 U CN202020088375 U CN 202020088375U CN 211645120 U CN211645120 U CN 211645120U
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Abstract
The utility model relates to a low order coal segmentation upgrading and hot flue gas cascade utilization system, which belongs to the technical field of low order pulverized coal pyrolysis, and specifically comprises a coal dropping channel connected with an outlet of a blanking cover of a rotary kiln, an upgrading pyrolysis section arranged on the upper part of the coal dropping channel, a multistage cooler arranged on the lower part of the coal dropping channel, the upgrading pyrolysis section comprising a plurality of heat exchange tubes arranged in the coal dropping channel, a hot air outlet of a hot-blast stove connected with a heat exchange medium inlet of the upgrading pyrolysis section, a heat exchange medium outlet of the upgrading pyrolysis section connected with an inlet of an inlet cover of the rotary kiln, an outlet cover outlet of the rotary kiln connected with a desulfurization and denitrification system through a fan, a first temperature sensor, a flowmeter and a butterfly valve arranged on a pipeline between the outlet cover outlet of the rotary kiln and the fan, the first temperature sensor and the fan are controlled in a linkage manner, the upgrading coal, the utility model has the advantages of reasonable design, can make full use of flue gas heat, reduce the energy consumption.
Description
Technical Field
The utility model relates to a low order coal segmentation is upgraded and hot flue gas step utilizes system belongs to low order fine coal pyrolysis technology 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.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem that prior art exists, the utility model provides a structural design is reasonable, can make full use of flue gas heat, reduces the low order coal segmentation pyrolysis hot flue gas step utilization system of energy consumption.
In order to achieve the purpose, the utility model discloses a technical scheme for a low order coal segmentation is upgraded and hot flue gas cascade utilizes system, including rotary kiln and hot-blast furnace, the unloading cover exit linkage of rotary kiln has upright stove, upright stove mainly comprises pyrolysis upgrading section and cooling zone, pyrolysis upgrading section sets up the upper portion at upright stove, the cooling zone sets up the lower part at upright stove, and the cooling zone mainly comprises a plurality of coolers, pyrolysis upgrading section is including installing a plurality of heat exchange tubes in upright stove, the hot-blast export of hot-blast furnace is connected with the heat transfer medium entry of pyrolysis upgrading section, the heat transfer medium export of pyrolysis upgrading section is connected with the inlet hood entry of rotary kiln, the export of the gas outlet hood of rotary kiln is connected with SOx/NOx control system through the fan, still install first temperature sensor on the pipeline between the export of the gas outlet hood of rotary kiln and the fan, The first temperature sensor is in linkage control with the fan, and the upgraded coal subjected to secondary pyrolysis in the pyrolysis upgrading section enters the cooling section to exchange heat with desalted water.
The low-rank coal is dried by a rotary kiln, subjected to first-stage pyrolysis quality improvement, enters the upper part of the vertical furnace through a discharging cover outlet to perform second-stage pyrolysis quality improvement, and then enters the lower part of the vertical furnace to perform cooling. And in the cooling and temperature reduction section, desalted water is used for cooling the upgraded coal subjected to secondary pyrolysis and generating steam as a byproduct. The hot flue gas gradient utilization means that hot air enters the vertical furnace upper part pyrolysis upgrading section heat exchange tube from the outlet of the hot blast stove to provide heat for second-stage pyrolysis for primary cooling, then enters the rotary kiln air inlet cover from the outlet of the vertical furnace upper part pyrolysis upgrading section heat exchange tube to provide heat for first-stage pyrolysis for secondary cooling, then provides heat for drying for terminal cooling, and finally is discharged from the air outlet cover of the rotary kiln and connected with a desulfurization and denitrification system through a fan.
Preferably, a hot air outlet of the air furnace is connected with a hot air adjusting pipeline, a first control valve is arranged on the hot air adjusting pipeline, a second temperature sensor is arranged on a pipeline between the hot air outlet of the hot air furnace and a heat exchange medium inlet of the pyrolysis upgrading section, and the second temperature sensor and the first control valve are controlled in a linkage mode.
Preferably, an air outlet of the fan is connected with a back-off flue gas pipeline, the back-off flue gas pipeline is connected with an air box of the hot blast stove, a second regulating valve is installed on the back-off flue gas pipeline, a third temperature sensor is installed on a pipeline between a heat exchange medium outlet of the pyrolysis upgrading section and an inlet of an air inlet cover of the rotary kiln, and the third temperature sensor and the second regulating valve are in linkage control.
Preferably, the steam generated after the heat exchange of the cooling section is connected with a steam drum through a pipeline and is used for generating byproduct steam.
Compared with the prior art, the utility model discloses technical effect below having.
1. Heating the low-rank coal by stages, dehydrating at low temperature, pyrolyzing at the first stage, pyrolyzing at the second stage, cooling to produce steam, heating by stages, and upgrading by stages. Firstly, the operation temperature of a first-stage pyrolysis rotary kiln is reduced, and the long-period operation of the rotary kiln is facilitated; secondly, the coke precipitation blockage caused by the pure cooling of the vertical furnace is reduced, and the equipment operation is hindered; thirdly, the yield maximization and the quality optimization of the low-rank coal pyrolysis tar are realized.
2. The hot flue gas is cooled in a segmented manner, and is subjected to countercurrent heat exchange with low-rank coal and cascade utilization: 1) the investment increase caused by two sets of hot air systems and the flue gas treatment difficulty caused by different pressure drops of two outlet flue gases in operation are avoided; 2) the problem of one set of hot air system, the flue gas outlet advances two pyrolysis device air volume distribution control degree of difficulty respectively is avoided. 3) Through relevant process control, the whole hot air system is connected in series and utilized in a gradient manner, so that the production control is facilitated, the effective utilization of heat is facilitated, and the environmental protection requirement is met.
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 first 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, the low-rank coal segmented upgrading and hot flue gas gradient utilization system comprises a rotary kiln 1 and a hot blast stove 2, wherein an outlet of a discharging cover of the rotary kiln 1 is connected with a vertical furnace 3, the vertical furnace 3 mainly comprises a pyrolysis upgrading section 4 and a cooling section 5, the pyrolysis upgrading section 4 is arranged at the upper part of the vertical furnace 3, the cooling section 5 is arranged at the lower part of the vertical furnace 3, the cooling section 5 mainly comprises a plurality of coolers, the pyrolysis upgrading section 4 comprises a plurality of heat exchange tubes arranged in the vertical furnace, a hot air outlet of the hot blast stove 2 is connected with a heat exchange medium inlet of the pyrolysis upgrading section 4, a heat exchange medium outlet of the pyrolysis upgrading section 4 is connected with an inlet of an air inlet cover of the rotary kiln 1, an outlet of an air outlet cover of the rotary kiln 1 is connected with a desulfurization and denitrification system through a fan 6, and a first temperature sensor 7, a second temperature sensor and a second, A flow meter 8, a butterfly valve 9 and a first temperature sensor 7 are controlled by a fan 6 in a linkage manner, and the upgraded coal subjected to secondary pyrolysis in the pyrolysis upgrading section 4 enters the cooling section 5 to exchange heat with desalted water.
The air outlet of the fan 6 is connected with a back-off flue gas pipeline 14, the back-off flue gas pipeline 14 is connected with an air box of the hot blast stove 2, a second adjusting valve 15 is installed on the back-off flue gas pipeline 14, a third temperature sensor 16 is installed on a pipeline between a heat exchange medium outlet of the pyrolysis upgrading section 4 and an inlet of an air inlet cover of the rotary kiln, and the third temperature sensor 16 and the second adjusting valve 15 are in linkage control. The upgraded coal subjected to secondary pyrolysis in the pyrolysis upgrading section 4 enters the cooling section 5 to exchange heat with desalted water, and steam generated by heat exchange can be connected with the steam drum 10 through a pipeline to be used for generating byproduct steam.
In the embodiment, the hot blast stove is used for adjusting back the low-temperature flue gas after partial pyrolysis through a flue gas adjusting back pipeline, and the temperature of the hot blast produced by the hot blast stove is adjusted to control the temperature, so that the outlet temperature of the hot blast stove is 950-1200 ℃, then the outlet temperature is 850-1050 ℃ after heat exchange in the pyrolysis quality-improving section 4, the drying and pyrolysis requirements of the rotary kiln are met, then the temperature of the positioned flue gas after drying and pyrolysis of the rotary kiln can be kept at 150-300 ℃, and the use requirements of the existing desulfurization and denitrification system are met. The third temperature sensor 16 is used for detecting the temperature of the outlet flue gas of the pyrolysis upgrading section 4, and adjusting the opening of the second adjusting valve 15 according to the outlet temperature, so as to adjust the amount of the flue gas.
Example two
A hot air outlet of the hot air furnace 2 is connected with a hot air adjusting pipeline 11, a first control valve 12 is arranged on the hot air adjusting pipeline 11, the control of the temperature of hot flue gas is realized by controlling the steam level and the steam generation amount generated by a boiler, a second temperature sensor 13 is arranged on a pipeline between the hot air outlet of the hot air furnace 2 and a heat exchange medium inlet of the pyrolysis upgrading section 4, and the second temperature sensor 13 and the first control valve 12 are controlled in a linkage mode. The rest is the same as the first embodiment.
In the embodiment, the hot air regulating pipeline 11 is controlled to control the temperature of the hot air entering the pyrolysis upgrading section 4, the second temperature sensor 13 directly detects the temperature of the outlet of the hot air furnace, and then the opening degree of the first control valve 12 is regulated according to the temperature.
When the coal gasification furnace is used specifically, raw material coal is dried and pyrolyzed for the first time in a rotary kiln, oil gas resources in low-rank coal are extracted, upgraded coal volatile matter at the outlet of the rotary kiln is 14% -18% and the temperature is 450 ℃ -550 ℃, then the coal gasification furnace enters a pyrolysis upgrading section of a vertical furnace for pyrolysis for the second time, residual pyrolysis gas is extracted, upgraded coal volatile matter at the outlet of the vertical furnace is 4% -10%, the temperature is 600 ℃ -800 ℃, the coal gasification furnace enters a cooling section of the vertical furnace, indirect heat exchange is carried out between the coal gasification furnace and desalted water, steam with different grades is generated according to the needs of the whole plant, and the temperature of the upgraded coal cooling outlet is 40 ℃ -160 ℃;
hot air generated by the hot blast stove is controlled to have outlet flue gas temperature of 950-1200 ℃ by adjusting back part of flue gas or controlling steam generation grade and steam generation quantity, after heat exchange with upgraded coal in a pyrolysis upgrading section, the outlet flue gas temperature is controlled to be kept at 850-1050 ℃ and enters the rotary kiln to provide heat for drying and pyrolysis of the rotary kiln, the outlet flue gas temperature after drying and pyrolysis of the rotary kiln is 150-300 ℃, the outlet flue gas part is adjusted back to the hot blast stove hot flue gas temperature, the rest part is discharged out of the system after denitration and desulfurization, or part of the outlet flue gas is adjusted back to the hot blast stove hot flue gas temperature after denitration and desulfurization, and the rest part of.
The foregoing is considered as illustrative and not restrictive, 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 (4)
1. The utility model provides a low order coal segmentation is upgraded and hot flue gas cascade utilization system, includes rotary kiln and hot-blast furnace, its characterized in that: the outlet of the discharging cover of the rotary kiln is connected with a vertical furnace which mainly comprises a pyrolysis quality-improving section and a cooling section, the pyrolysis quality-improving section comprises a plurality of heat exchange tubes arranged in the vertical furnace, the pyrolysis quality-improving section is arranged at the upper part of the vertical furnace, the cooling section is arranged at the lower part of the vertical furnace, and the cooling section is mainly composed of a plurality of coolers, a hot air outlet of the hot blast stove is connected with a heat exchange medium inlet of the pyrolysis upgrading section, the outlet of the heat exchange medium of the pyrolysis upgrading section is connected with the inlet of an air inlet hood of the rotary kiln, the outlet of an air outlet hood of the rotary kiln is connected with a desulfurization and denitrification system through a fan, a first temperature sensor, a flowmeter and a butterfly valve are also arranged on a pipeline between the outlet of the air outlet cover of the rotary kiln and the fan, and the first temperature sensor is controlled by the fan in a linkage manner, and the upgraded coal subjected to secondary pyrolysis in the pyrolysis upgrading section enters the cooling section to exchange heat with desalted water.
2. The low-rank coal segmented upgrading and hot flue gas gradient utilization system according to claim 1, characterized in that: the hot air outlet of the hot air furnace is connected with a hot air adjusting pipeline, a first control valve is arranged on the hot air adjusting pipeline, a second temperature sensor is arranged on a pipeline between the hot air outlet of the hot air furnace and a heat exchange medium inlet of the pyrolysis upgrading section, and the second temperature sensor and the first control valve are controlled in a linkage mode.
3. The low-rank coal segmented upgrading and hot flue gas gradient utilization system according to claim 1, characterized in that: the air outlet of the fan is connected with a back-off flue gas pipeline, the back-off flue gas pipeline is connected with an air box of the hot blast stove, a second adjusting valve is installed on the back-off flue gas pipeline, a third temperature sensor is installed on a pipeline between a heat exchange medium outlet of the pyrolysis upgrading section and an inlet of an air inlet cover of the rotary kiln, and the third temperature sensor and the second adjusting valve are in linkage control.
4. The low-rank coal segmented upgrading and hot flue gas gradient utilization system according to claim 1, characterized in that: and the steam generated after the heat exchange of the cooling section is connected with a steam drum through a pipeline and is used for generating byproduct steam.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114231304A (en) * | 2021-12-17 | 2022-03-25 | 厦门大学 | Internal circulation biomass carbonization device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114231304A (en) * | 2021-12-17 | 2022-03-25 | 厦门大学 | Internal circulation biomass carbonization device |
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Effective date of registration: 20220330 Address after: 474550 no.110-21, Baiyu Road, Chengguan Town, Xixia County, Nanyang City, Henan Province Patentee after: Bai Taikuan Address before: 030006 2101, block a, Gaoxin Guozhi building, No.3, Dongyi second lane, Taiyuan Xuefu Park, Xiaodian District, Taiyuan City, Shanxi Province Patentee before: Shanxi Zhirong New Energy Technology Co.,Ltd. |
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